mirror of
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Add zxing wrapper
This commit is contained in:
jacques
parent
040a3f1d86
commit
db6313fd91
2 changed files with 603 additions and 0 deletions
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@ -0,0 +1,510 @@
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/*
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* Copyright 2009 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.zxing.integration.android;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.app.Fragment;
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import android.content.ActivityNotFoundException;
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import android.content.DialogInterface;
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import android.content.Intent;
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import android.content.pm.PackageManager;
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import android.content.pm.ResolveInfo;
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import android.net.Uri;
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import android.os.Bundle;
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import android.util.Log;
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/**
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* <p>A utility class which helps ease integration with Barcode Scanner via {@link Intent}s. This is a simple
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* way to invoke barcode scanning and receive the result, without any need to integrate, modify, or learn the
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* project's source code.</p>
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*
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* <h1>Initiating a barcode scan</h1>
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*
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* <p>To integrate, create an instance of {@code IntentIntegrator} and call {@link #initiateScan()} and wait
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* for the result in your app.</p>
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*
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* <p>It does require that the Barcode Scanner (or work-alike) application is installed. The
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* {@link #initiateScan()} method will prompt the user to download the application, if needed.</p>
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*
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* <p>There are a few steps to using this integration. First, your {@link Activity} must implement
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* the method {@link Activity#onActivityResult(int, int, Intent)} and include a line of code like this:</p>
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*
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* <pre>{@code
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* public void onActivityResult(int requestCode, int resultCode, Intent intent) {
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* IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
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* if (scanResult != null) {
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* // handle scan result
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* }
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* // else continue with any other code you need in the method
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* ...
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* }
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* }</pre>
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*
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* <p>This is where you will handle a scan result.</p>
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*
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* <p>Second, just call this in response to a user action somewhere to begin the scan process:</p>
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*
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* <pre>{@code
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* IntentIntegrator integrator = new IntentIntegrator(yourActivity);
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* integrator.initiateScan();
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* }</pre>
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*
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* <p>Note that {@link #initiateScan()} returns an {@link AlertDialog} which is non-null if the
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* user was prompted to download the application. This lets the calling app potentially manage the dialog.
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* In particular, ideally, the app dismisses the dialog if it's still active in its {@link Activity#onPause()}
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* method.</p>
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*
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* <p>You can use {@link #setTitle(String)} to customize the title of this download prompt dialog (or, use
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* {@link #setTitleByID(int)} to set the title by string resource ID.) Likewise, the prompt message, and
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* yes/no button labels can be changed.</p>
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*
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* <p>Finally, you can use {@link #addExtra(String, Object)} to add more parameters to the Intent used
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* to invoke the scanner. This can be used to set additional options not directly exposed by this
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* simplified API.</p>
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*
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* <p>By default, this will only allow applications that are known to respond to this intent correctly
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* do so. The apps that are allowed to response can be set with {@link #setTargetApplications(List)}.
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* For example, set to {@link #TARGET_BARCODE_SCANNER_ONLY} to only target the Barcode Scanner app itself.</p>
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*
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* <h1>Sharing text via barcode</h1>
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*
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* <p>To share text, encoded as a QR Code on-screen, similarly, see {@link #shareText(CharSequence)}.</p>
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*
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* <p>Some code, particularly download integration, was contributed from the Anobiit application.</p>
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*
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* <h1>Enabling experimental barcode formats</h1>
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*
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* <p>Some formats are not enabled by default even when scanning with {@link #ALL_CODE_TYPES}, such as
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* PDF417. Use {@link #initiateScan(Collection)} with
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* a collection containing the names of formats to scan for explicitly, like "PDF_417", to use such
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* formats.</p>
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*
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* @author Sean Owen
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* @author Fred Lin
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* @author Isaac Potoczny-Jones
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* @author Brad Drehmer
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* @author gcstang
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*/
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public class IntentIntegrator {
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public static final int REQUEST_CODE = 0x0000c0de; // Only use bottom 16 bits
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private static final String TAG = IntentIntegrator.class.getSimpleName();
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public static final String DEFAULT_TITLE = "Install Barcode Scanner?";
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public static final String DEFAULT_MESSAGE =
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"This application requires Barcode Scanner. Would you like to install it?";
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public static final String DEFAULT_YES = "Yes";
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public static final String DEFAULT_NO = "No";
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private static final String BS_PACKAGE = "com.google.zxing.client.android";
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private static final String BSPLUS_PACKAGE = "com.srowen.bs.android";
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// supported barcode formats
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public static final Collection<String> PRODUCT_CODE_TYPES = list("UPC_A", "UPC_E", "EAN_8", "EAN_13", "RSS_14");
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public static final Collection<String> ONE_D_CODE_TYPES =
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list("UPC_A", "UPC_E", "EAN_8", "EAN_13", "CODE_39", "CODE_93", "CODE_128",
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"ITF", "RSS_14", "RSS_EXPANDED");
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public static final Collection<String> QR_CODE_TYPES = Collections.singleton("QR_CODE");
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public static final Collection<String> DATA_MATRIX_TYPES = Collections.singleton("DATA_MATRIX");
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public static final Collection<String> ALL_CODE_TYPES = null;
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public static final List<String> TARGET_BARCODE_SCANNER_ONLY = Collections.singletonList(BS_PACKAGE);
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public static final List<String> TARGET_ALL_KNOWN = list(
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BSPLUS_PACKAGE, // Barcode Scanner+
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BSPLUS_PACKAGE + ".simple", // Barcode Scanner+ Simple
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BS_PACKAGE // Barcode Scanner
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// What else supports this intent?
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);
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// Should be FLAG_ACTIVITY_NEW_DOCUMENT in API 21+.
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// Defined once here because the current value is deprecated, so generates just one warning
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private static final int FLAG_NEW_DOC = Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET;
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private final Activity activity;
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private final Fragment fragment;
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private String title;
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private String message;
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private String buttonYes;
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private String buttonNo;
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private List<String> targetApplications;
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private final Map<String,Object> moreExtras = new HashMap<>(3);
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/**
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* @param activity {@link Activity} invoking the integration
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*/
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public IntentIntegrator(Activity activity) {
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this.activity = activity;
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this.fragment = null;
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initializeConfiguration();
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}
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/**
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* @param fragment {@link Fragment} invoking the integration.
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* {@link #startActivityForResult(Intent, int)} will be called on the {@link Fragment} instead
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* of an {@link Activity}
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*/
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public IntentIntegrator(Fragment fragment) {
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this.activity = fragment.getActivity();
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this.fragment = fragment;
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initializeConfiguration();
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}
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private void initializeConfiguration() {
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title = DEFAULT_TITLE;
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message = DEFAULT_MESSAGE;
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buttonYes = DEFAULT_YES;
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buttonNo = DEFAULT_NO;
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targetApplications = TARGET_ALL_KNOWN;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public void setTitleByID(int titleID) {
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title = activity.getString(titleID);
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}
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public String getMessage() {
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return message;
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}
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public void setMessage(String message) {
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this.message = message;
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}
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public void setMessageByID(int messageID) {
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message = activity.getString(messageID);
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}
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public String getButtonYes() {
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return buttonYes;
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}
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public void setButtonYes(String buttonYes) {
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this.buttonYes = buttonYes;
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}
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public void setButtonYesByID(int buttonYesID) {
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buttonYes = activity.getString(buttonYesID);
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}
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public String getButtonNo() {
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return buttonNo;
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}
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public void setButtonNo(String buttonNo) {
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this.buttonNo = buttonNo;
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}
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public void setButtonNoByID(int buttonNoID) {
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buttonNo = activity.getString(buttonNoID);
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}
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public Collection<String> getTargetApplications() {
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return targetApplications;
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}
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public final void setTargetApplications(List<String> targetApplications) {
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if (targetApplications.isEmpty()) {
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throw new IllegalArgumentException("No target applications");
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}
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this.targetApplications = targetApplications;
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}
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public void setSingleTargetApplication(String targetApplication) {
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this.targetApplications = Collections.singletonList(targetApplication);
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}
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public Map<String,?> getMoreExtras() {
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return moreExtras;
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}
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public final void addExtra(String key, Object value) {
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moreExtras.put(key, value);
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}
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/**
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* Initiates a scan for all known barcode types with the default camera.
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*
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* @return the {@link AlertDialog} that was shown to the user prompting them to download the app
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* if a prompt was needed, or null otherwise.
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*/
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public final AlertDialog initiateScan() {
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return initiateScan(ALL_CODE_TYPES, -1);
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}
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/**
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* Initiates a scan for all known barcode types with the specified camera.
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*
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* @param cameraId camera ID of the camera to use. A negative value means "no preference".
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* @return the {@link AlertDialog} that was shown to the user prompting them to download the app
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* if a prompt was needed, or null otherwise.
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*/
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public final AlertDialog initiateScan(int cameraId) {
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return initiateScan(ALL_CODE_TYPES, cameraId);
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}
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/**
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* Initiates a scan, using the default camera, only for a certain set of barcode types, given as strings corresponding
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* to their names in ZXing's {@code BarcodeFormat} class like "UPC_A". You can supply constants
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* like {@link #PRODUCT_CODE_TYPES} for example.
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*
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* @param desiredBarcodeFormats names of {@code BarcodeFormat}s to scan for
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* @return the {@link AlertDialog} that was shown to the user prompting them to download the app
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* if a prompt was needed, or null otherwise.
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*/
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public final AlertDialog initiateScan(Collection<String> desiredBarcodeFormats) {
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return initiateScan(desiredBarcodeFormats, -1);
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}
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/**
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* Initiates a scan, using the specified camera, only for a certain set of barcode types, given as strings corresponding
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* to their names in ZXing's {@code BarcodeFormat} class like "UPC_A". You can supply constants
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* like {@link #PRODUCT_CODE_TYPES} for example.
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*
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* @param desiredBarcodeFormats names of {@code BarcodeFormat}s to scan for
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* @param cameraId camera ID of the camera to use. A negative value means "no preference".
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* @return the {@link AlertDialog} that was shown to the user prompting them to download the app
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* if a prompt was needed, or null otherwise
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*/
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public final AlertDialog initiateScan(Collection<String> desiredBarcodeFormats, int cameraId) {
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Intent intentScan = new Intent(BS_PACKAGE + ".SCAN");
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intentScan.addCategory(Intent.CATEGORY_DEFAULT);
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// check which types of codes to scan for
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if (desiredBarcodeFormats != null) {
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// set the desired barcode types
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StringBuilder joinedByComma = new StringBuilder();
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for (String format : desiredBarcodeFormats) {
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if (joinedByComma.length() > 0) {
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joinedByComma.append(',');
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}
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joinedByComma.append(format);
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}
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intentScan.putExtra("SCAN_FORMATS", joinedByComma.toString());
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}
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// check requested camera ID
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if (cameraId >= 0) {
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intentScan.putExtra("SCAN_CAMERA_ID", cameraId);
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}
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String targetAppPackage = findTargetAppPackage(intentScan);
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if (targetAppPackage == null) {
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return showDownloadDialog();
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}
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intentScan.setPackage(targetAppPackage);
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intentScan.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
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intentScan.addFlags(FLAG_NEW_DOC);
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attachMoreExtras(intentScan);
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startActivityForResult(intentScan, REQUEST_CODE);
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return null;
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}
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/**
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* Start an activity. This method is defined to allow different methods of activity starting for
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* newer versions of Android and for compatibility library.
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*
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* @param intent Intent to start.
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* @param code Request code for the activity
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* @see Activity#startActivityForResult(Intent, int)
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* @see Fragment#startActivityForResult(Intent, int)
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*/
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protected void startActivityForResult(Intent intent, int code) {
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if (fragment == null) {
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activity.startActivityForResult(intent, code);
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} else {
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fragment.startActivityForResult(intent, code);
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}
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}
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private String findTargetAppPackage(Intent intent) {
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PackageManager pm = activity.getPackageManager();
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List<ResolveInfo> availableApps = pm.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
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if (availableApps != null) {
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for (String targetApp : targetApplications) {
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if (contains(availableApps, targetApp)) {
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return targetApp;
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}
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}
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}
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return null;
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}
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private static boolean contains(Iterable<ResolveInfo> availableApps, String targetApp) {
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for (ResolveInfo availableApp : availableApps) {
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String packageName = availableApp.activityInfo.packageName;
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if (targetApp.equals(packageName)) {
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return true;
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}
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}
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return false;
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}
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private AlertDialog showDownloadDialog() {
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AlertDialog.Builder downloadDialog = new AlertDialog.Builder(activity);
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downloadDialog.setTitle(title);
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downloadDialog.setMessage(message);
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downloadDialog.setPositiveButton(buttonYes, new DialogInterface.OnClickListener() {
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@Override
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public void onClick(DialogInterface dialogInterface, int i) {
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String packageName;
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if (targetApplications.contains(BS_PACKAGE)) {
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// Prefer to suggest download of BS if it's anywhere in the list
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packageName = BS_PACKAGE;
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} else {
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// Otherwise, first option:
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packageName = targetApplications.get(0);
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}
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Uri uri = Uri.parse("market://details?id=" + packageName);
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Intent intent = new Intent(Intent.ACTION_VIEW, uri);
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try {
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if (fragment == null) {
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activity.startActivity(intent);
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} else {
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fragment.startActivity(intent);
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}
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} catch (ActivityNotFoundException anfe) {
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// Hmm, market is not installed
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Log.w(TAG, "Google Play is not installed; cannot install " + packageName);
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}
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}
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});
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downloadDialog.setNegativeButton(buttonNo, null);
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downloadDialog.setCancelable(true);
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return downloadDialog.show();
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}
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/**
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* <p>Call this from your {@link Activity}'s
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* {@link Activity#onActivityResult(int, int, Intent)} method.</p>
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*
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* @param requestCode request code from {@code onActivityResult()}
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* @param resultCode result code from {@code onActivityResult()}
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* @param intent {@link Intent} from {@code onActivityResult()}
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* @return null if the event handled here was not related to this class, or
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* else an {@link IntentResult} containing the result of the scan. If the user cancelled scanning,
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* the fields will be null.
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*/
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public static com.google.zxing.integration.android.IntentResult parseActivityResult(int requestCode, int resultCode, Intent intent) {
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if (requestCode == REQUEST_CODE) {
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if (resultCode == Activity.RESULT_OK) {
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String contents = intent.getStringExtra("SCAN_RESULT");
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String formatName = intent.getStringExtra("SCAN_RESULT_FORMAT");
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byte[] rawBytes = intent.getByteArrayExtra("SCAN_RESULT_BYTES");
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int intentOrientation = intent.getIntExtra("SCAN_RESULT_ORIENTATION", Integer.MIN_VALUE);
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Integer orientation = intentOrientation == Integer.MIN_VALUE ? null : intentOrientation;
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String errorCorrectionLevel = intent.getStringExtra("SCAN_RESULT_ERROR_CORRECTION_LEVEL");
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return new IntentResult(contents,
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formatName,
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rawBytes,
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orientation,
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errorCorrectionLevel);
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}
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return new IntentResult();
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}
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return null;
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}
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/**
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* Defaults to type "TEXT_TYPE".
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*
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* @param text the text string to encode as a barcode
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* @return the {@link AlertDialog} that was shown to the user prompting them to download the app
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* if a prompt was needed, or null otherwise
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* @see #shareText(CharSequence, CharSequence)
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*/
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public final AlertDialog shareText(CharSequence text) {
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return shareText(text, "TEXT_TYPE");
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}
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/**
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* Shares the given text by encoding it as a barcode, such that another user can
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* scan the text off the screen of the device.
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*
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* @param text the text string to encode as a barcode
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* @param type type of data to encode. See {@code com.google.zxing.client.android.Contents.Type} constants.
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* @return the {@link AlertDialog} that was shown to the user prompting them to download the app
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* if a prompt was needed, or null otherwise
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*/
|
||||
public final AlertDialog shareText(CharSequence text, CharSequence type) {
|
||||
Intent intent = new Intent();
|
||||
intent.addCategory(Intent.CATEGORY_DEFAULT);
|
||||
intent.setAction(BS_PACKAGE + ".ENCODE");
|
||||
intent.putExtra("ENCODE_TYPE", type);
|
||||
intent.putExtra("ENCODE_DATA", text);
|
||||
String targetAppPackage = findTargetAppPackage(intent);
|
||||
if (targetAppPackage == null) {
|
||||
return showDownloadDialog();
|
||||
}
|
||||
intent.setPackage(targetAppPackage);
|
||||
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
|
||||
intent.addFlags(FLAG_NEW_DOC);
|
||||
attachMoreExtras(intent);
|
||||
if (fragment == null) {
|
||||
activity.startActivity(intent);
|
||||
} else {
|
||||
fragment.startActivity(intent);
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
private static List<String> list(String... values) {
|
||||
return Collections.unmodifiableList(Arrays.asList(values));
|
||||
}
|
||||
|
||||
private void attachMoreExtras(Intent intent) {
|
||||
for (Map.Entry<String,Object> entry : moreExtras.entrySet()) {
|
||||
String key = entry.getKey();
|
||||
Object value = entry.getValue();
|
||||
// Kind of hacky
|
||||
if (value instanceof Integer) {
|
||||
intent.putExtra(key, (Integer) value);
|
||||
} else if (value instanceof Long) {
|
||||
intent.putExtra(key, (Long) value);
|
||||
} else if (value instanceof Boolean) {
|
||||
intent.putExtra(key, (Boolean) value);
|
||||
} else if (value instanceof Double) {
|
||||
intent.putExtra(key, (Double) value);
|
||||
} else if (value instanceof Float) {
|
||||
intent.putExtra(key, (Float) value);
|
||||
} else if (value instanceof Bundle) {
|
||||
intent.putExtra(key, (Bundle) value);
|
||||
} else {
|
||||
intent.putExtra(key, value.toString());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,93 @@
|
|||
/*
|
||||
* Copyright 2009 ZXing authors
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package com.google.zxing.integration.android;
|
||||
|
||||
/**
|
||||
* <p>Encapsulates the result of a barcode scan invoked through {@link IntentIntegrator}.</p>
|
||||
*
|
||||
* @author Sean Owen
|
||||
*/
|
||||
public final class IntentResult {
|
||||
|
||||
private final String contents;
|
||||
private final String formatName;
|
||||
private final byte[] rawBytes;
|
||||
private final Integer orientation;
|
||||
private final String errorCorrectionLevel;
|
||||
|
||||
IntentResult() {
|
||||
this(null, null, null, null, null);
|
||||
}
|
||||
|
||||
IntentResult(String contents,
|
||||
String formatName,
|
||||
byte[] rawBytes,
|
||||
Integer orientation,
|
||||
String errorCorrectionLevel) {
|
||||
this.contents = contents;
|
||||
this.formatName = formatName;
|
||||
this.rawBytes = rawBytes;
|
||||
this.orientation = orientation;
|
||||
this.errorCorrectionLevel = errorCorrectionLevel;
|
||||
}
|
||||
|
||||
/**
|
||||
* @return raw content of barcode
|
||||
*/
|
||||
public String getContents() {
|
||||
return contents;
|
||||
}
|
||||
|
||||
/**
|
||||
* @return name of format, like "QR_CODE", "UPC_A". See {@code BarcodeFormat} for more format names.
|
||||
*/
|
||||
public String getFormatName() {
|
||||
return formatName;
|
||||
}
|
||||
|
||||
/**
|
||||
* @return raw bytes of the barcode content, if applicable, or null otherwise
|
||||
*/
|
||||
public byte[] getRawBytes() {
|
||||
return rawBytes;
|
||||
}
|
||||
|
||||
/**
|
||||
* @return rotation of the image, in degrees, which resulted in a successful scan. May be null.
|
||||
*/
|
||||
public Integer getOrientation() {
|
||||
return orientation;
|
||||
}
|
||||
|
||||
/**
|
||||
* @return name of the error correction level used in the barcode, if applicable
|
||||
*/
|
||||
public String getErrorCorrectionLevel() {
|
||||
return errorCorrectionLevel;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
int rawBytesLength = rawBytes == null ? 0 : rawBytes.length;
|
||||
return "Format: " + formatName + '\n' +
|
||||
"Contents: " + contents + '\n' +
|
||||
"Raw bytes: (" + rawBytesLength + " bytes)\n" +
|
||||
"Orientation: " + orientation + '\n' +
|
||||
"EC level: " + errorCorrectionLevel + '\n';
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in a new issue