二维码扫描,中文解释源码
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导入项目
1 <FrameLayoutxmlns:android="http://schemas.android.com/apk/res/android"
2android:layout_width="fill_parent" android:layout_height="fill_parent">
3<SurfaceViewandroid:id="@+id/preview_view"
4android:layout_width="fill_parent" android:layout_height="fill_parent"
5android:layout_centerInParent="true"/>
6
7<com.Zxing.Demo.view.ViewfinderView
8android:id="@+id/viewfinder_view" android:layout_width="fill_parent"
9android:layout_height="fill_parent" android:background="@android:color/transparent"/>
10<TextViewandroid:layout_width="wrap_content"
11android:id="@+id/txtResult"
12android:layout_height="wrap_content" android:text="@string/hello"/>
13
14</FrameLayout>
1 @Override
2public void onCreate(Bundle savedInstanceState) {
3super.onCreate(savedInstanceState);
4setContentView(R.layout.main);
5//初始化 CameraManager
6CameraManager.init(getApplication());
7
8viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
9txtResult = (TextView) findViewById(R.id.txtResult);
10hasSurface =false;
11inactivityTimer =new InactivityTimer(this);
12}
//是否使用前灯
// if (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false)) {
// FlashlightManager.enableFlashlight();
// }
FlashlightManager.enableFlashlight();
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-feature android:name="android.hardware.camera"/>
<uses-feature android:name="android.hardware.camera.autofocus"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-permission android:name="android.permission.FLASHLIGHT"/>
@Override
protected void onResume() {
super.onResume();
SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
SurfaceHolder surfaceHolder = surfaceView.getHolder();
if (hasSurface) {
initCamera(surfaceHolder);
} else {
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
decodeFormats =null;
characterSet =null;
playBeep =true;
AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
if (audioService.getRingerMode()!= AudioManager.RINGER_MODE_NORMAL) {
playBeep =false;
}
initBeepSound();
vibrate =true;
}
initCamera
1 private void initCamera(SurfaceHolder surfaceHolder) {
2try {
3CameraManager.get().openDriver(surfaceHolder);
4} catch (IOException ioe) {
5return;
6} catch (RuntimeException e) {
7return;
8}
9if (handler==null) {
10handler =new CaptureActivityHandler(this, decodeFormats,
11characterSet);
12}
13}
SurfaceHolder接口实现
@Override
public void surfaceChanged(SurfaceHolder holder,int format,int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (!hasSurface) {
hasSurface =true;
initCamera(holder);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
hasSurface =false;
}
DecodeThread(CaptureActivity activity,
Vector<BarcodeFormat> decodeFormats,
String characterSet,
ResultPointCallback resultPointCallback) {
this.activity= activity;
handlerInitLatch =new CountDownLatch(1);
hints =new Hashtable<DecodeHintType, Object>(3);
//// The prefs can't change while the thread is running, so pick them up once here.
// if (decodeFormats == null || decodeFormats.isEmpty()) {
// SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
// decodeFormats = new Vector<BarcodeFormat>();
// if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_1D, true)) {
// decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
// }
// if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_QR, true)) {
// decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
// }
// if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_DATA_MATRIX, true)) {
// decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
// }
// }
if (decodeFormats==null|| decodeFormats.isEmpty()) {
decodeFormats =new Vector<BarcodeFormat>();
decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
}
hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);
if (characterSet!=null) {
hints.put(DecodeHintType.CHARACTER_SET, characterSet);
}
hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, resultPointCallback);
}
public void handleDecode(Result obj, Bitmap barcode) {
inactivityTimer.onActivity();
viewfinderView.drawResultBitmap(barcode);
playBeepSoundAndVibrate();
txtResult.setText(obj.getBarcodeFormat().toString() +":"
+ obj.getText());
}
最后
publicclass CaptureActivityextends Activityimplements Callback {
private CaptureActivityHandler handler;
private ViewfinderView viewfinderView;
privateboolean hasSurface;
private Vector<BarcodeFormat> decodeFormats;
private String characterSet;
private TextView txtResult;
private InactivityTimer inactivityTimer;
private MediaPlayer mediaPlayer;
privateboolean playBeep;
privatestaticfinalfloat BEEP_VOLUME =0.10f;
privateboolean vibrate;
/** Called when the activity is first created.*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//初始化 CameraManager
CameraManager.init(getApplication());
viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
txtResult = (TextView) findViewById(R.id.txtResult);
hasSurface =false;
inactivityTimer =new InactivityTimer(this);
}
@Override
protectedvoid onResume() {
super.onResume();
SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
SurfaceHolder surfaceHolder = surfaceView.getHolder();
if (hasSurface) {
initCamera(surfaceHolder);
} else {
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
decodeFormats =null;
characterSet =null;
playBeep =true;
AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
if (audioService.getRingerMode()!= AudioManager.RINGER_MODE_NORMAL) {
playBeep =false;
}
initBeepSound();
vibrate =true;
}
@Override
protectedvoid onPause() {
super.onPause();
if (handler!=null) {
handler.quitSynchronously();
handler =null;
}
CameraManager.get().closeDriver();
}
@Override
protectedvoid onDestroy() {
inactivityTimer.shutdown();
super.onDestroy();
}
privatevoid initCamera(SurfaceHolder surfaceHolder) {
try {
CameraManager.get().openDriver(surfaceHolder);
} catch (IOException ioe) {
return;
} catch (RuntimeException e) {
return;
}
if (handler==null) {
handler =new CaptureActivityHandler(this, decodeFormats,
characterSet);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder,int format,int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (!hasSurface) {
hasSurface =true;
initCamera(holder);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
hasSurface =false;
}
public ViewfinderView getViewfinderView() {
return viewfinderView;
}
public Handler getHandler() {
return handler;
}
public void drawViewfinder() {
viewfinderView.drawViewfinder();
}
public void handleDecode(Result obj, Bitmap barcode) {
inactivityTimer.onActivity();
viewfinderView.drawResultBitmap(barcode);
playBeepSoundAndVibrate();
txtResult.setText(obj.getBarcodeFormat().toString() +":"
+ obj.getText());
}
private void initBeepSound() {
if (playBeep&& mediaPlayer==null) {
// The volume on STREAM_SYSTEM is not adjustable, and users found it
// too loud,
// so we now play on the music stream.
setVolumeControlStream(AudioManager.STREAM_MUSIC);
mediaPlayer =new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setOnCompletionListener(beepListener);
AssetFileDescriptor file = getResources().openRawResourceFd(
R.raw.beep);
try {
mediaPlayer.setDataSource(file.getFileDescriptor(),
file.getStartOffset(), file.getLength());
file.close();
mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
mediaPlayer.prepare();
} catch (IOException e) {
mediaPlayer =null;
}
}
}
private static finallong VIBRATE_DURATION=200L;
private void playBeepSoundAndVibrate() {
if (playBeep&& mediaPlayer!=null) {
mediaPlayer.start();
}
if (vibrate) {
Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
vibrator.vibrate(VIBRATE_DURATION);
}
}
/**
* When the beep has finished playing, rewind to queue up another one.
*/
private final OnCompletionListener beepListener=new OnCompletionListener() {
public void onCompletion(MediaPlayer mediaPlayer) {
mediaPlayer.seekTo(0);
}
};
打开Eclipse 导入 源码中的 Android 项目,然后右击项目 选择“Build path”——》"Add External Archives" 把核心库 core.jar文件加入到项目中。
此时编译一下项目,会发现报错,“ Multiple substitutions specified in non-positional format; did you mean to add the formatted="false" attribute?”之类的。打开raw 下的Values 发现错误是在一个<String>上。这里把 “preferences_custom_product_search_summary” 里的 %s %f 全部都改成 %1$s %1$f(因为我们用不到多国语言,建议只保留默认的Value ,其他全部删除)。
原因:由于新的SDK采用了新版本的aapt(Android项目编译器),这个版本的aapt编译起来会比老版本更加的严格,然后在Android最新的开发文档的描述String的部分,已经说明如何去设置 %s 等符号
“If you need to format your strings using String.format(String, Object...) , then you can do so by putting your format arguments in the string resource. For example, with the following resource:
<string name="welcome_messages">Hello, %1$s! You have %2$d new messages.</string>
In this example, the format string has two arguments: %1$s is a string and %2$d is a decimal number. You can format the string with arguements from your application...“
经过以上步骤后项目应该就可以运行了。
但是ZXing的android项目东西太多了,有很多是我们不需要的,得新建另一个项目简化它。
简化 在开始前大致介绍一下简化ZXing需要用到各个包 、类的职责。
- CaptureActivity。这个是启动Activity 也就是扫描器(如果是第一安装,它还会跳转到帮助界面)。
- CaptureActivityHandler 解码处理类,负责调用另外的线程进行解码。
- DecodeThread 解码的线程。
- com.google.zxing.client.android.camera 包,摄像头控制包。
- ViewfinderView 自定义的View,就是我们看见的拍摄时中间的框框了。
新建另一个项目将启动的Activity命名为CaptureActivity,并导入核心库。项目新建完成后我们打开 CaptureActivity 的布局文件,我这里为main。把里面的XML修改为:
1 <FrameLayoutxmlns:android="http://schemas.android.com/apk/res/android"
2android:layout_width="fill_parent" android:layout_height="fill_parent">
3<SurfaceViewandroid:id="@+id/preview_view"
4android:layout_width="fill_parent" android:layout_height="fill_parent"
5android:layout_centerInParent="true"/>
6
7<com.Zxing.Demo.view.ViewfinderView
8android:id="@+id/viewfinder_view" android:layout_width="fill_parent"
9android:layout_height="fill_parent" android:background="@android:color/transparent"/>
10<TextViewandroid:layout_width="wrap_content"
11android:id="@+id/txtResult"
12android:layout_height="wrap_content" android:text="@string/hello"/>
13
14</FrameLayout>
可以看到在XML里面用到了 ViewfinderView 自定义view 。所以新建一个View 的包,然后把:ViewfinderView 和 ViewfinderResultPointCallback 靠到里面(记得对应修改XML里面的包)。
打开 CaptureActivity 覆盖 onCreate 方法:
1 @Override
2public void onCreate(Bundle savedInstanceState) {
3super.onCreate(savedInstanceState);
4setContentView(R.layout.main);
5//初始化 CameraManager
6CameraManager.init(getApplication());
7
8viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
9txtResult = (TextView) findViewById(R.id.txtResult);
10hasSurface =false;
11inactivityTimer =new InactivityTimer(this);
12}
这里调用到的 CameraManager 类是控制摄像头的包里的类。新建一个camera包把:com.google.zxing.client.android.camera 里面的类全部拷入,另外我把PlanarYUVLuminanceSource也拷入到这个包里面。根据错误的提示来修正代码,主要是修改正包结构。(整个简化的流程都是如此:“根据错误提示,修改代码”)。
在修改的过程中,有很多是关于R 资源的问题,在此我们需要将Values 里面的两个xml资源文件拷入项目中:colos.xml 和ids.xml 。 ctrl+b 一下看看error 是不是少了很多。在CameraManager中有些地方需要用到项目的配置,这里需要把配置直接写入代码中:
// SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);//是否使用前灯
// if (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false)) {
// FlashlightManager.enableFlashlight();
// }
FlashlightManager.enableFlashlight();
使用摄像头需要加入相应的权限:
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-feature android:name="android.hardware.camera"/>
<uses-feature android:name="android.hardware.camera.autofocus"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-permission android:name="android.permission.FLASHLIGHT"/>
当View 和 camera 包里的错误修正完成后,我们继续来看CaptureActivity。
覆盖onResume方法初始化摄像头:
@Override
protected void onResume() {
super.onResume();
SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
SurfaceHolder surfaceHolder = surfaceView.getHolder();
if (hasSurface) {
initCamera(surfaceHolder);
} else {
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
decodeFormats =null;
characterSet =null;
playBeep =true;
AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
if (audioService.getRingerMode()!= AudioManager.RINGER_MODE_NORMAL) {
playBeep =false;
}
initBeepSound();
vibrate =true;
}
initCamera
1 private void initCamera(SurfaceHolder surfaceHolder) {
2try {
3CameraManager.get().openDriver(surfaceHolder);
4} catch (IOException ioe) {
5return;
6} catch (RuntimeException e) {
7return;
8}
9if (handler==null) {
10handler =new CaptureActivityHandler(this, decodeFormats,
11characterSet);
12}
13}
SurfaceHolder接口实现
@Override
public void surfaceChanged(SurfaceHolder holder,int format,int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (!hasSurface) {
hasSurface =true;
initCamera(holder);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
hasSurface =false;
}
initCamera () 方法用于初始化摄像头,如果排除了所有的error ,运行项目时就可以看到大致扫描界面了。 surfaceHolder.addCallback(this);表示让CaptureActivity实现其callback接口。
handler = new CaptureActivityHandler(this, decodeFormats,characterSet) 用于进行扫描解码处理。
解码 上面的步骤主要都是用于对摄像头的控制,而解码的真正工作入口是在CaptureActivityHandler 里面的。新建一个Decoding包把以下文件拷入包中:
- CaptureActivityHandler
- DecodeFormatManager
- DecodeHandler
- DecodeThread
- FinishListener
- InactivityTimer
- Intents
由于我们的包结构和Zxing 项目的有所不同所以需要注意一下类的可访问性
同样开始ctrl+B 编译一下,然后开始修正错误。
在CaptureActivityHandler 里 把 handleMessage 里的部分方法先注释掉如:“decode_succeeded ”分支,这是解码成功时调用 CaptureActivity 展示解码的结果。
在DecodeThread 类里,修改部分涉及Preference配置的代码:
DecodeThread(CaptureActivity activity,
Vector<BarcodeFormat> decodeFormats,
String characterSet,
ResultPointCallback resultPointCallback) {
this.activity= activity;
handlerInitLatch =new CountDownLatch(1);
hints =new Hashtable<DecodeHintType, Object>(3);
//// The prefs can't change while the thread is running, so pick them up once here.
// if (decodeFormats == null || decodeFormats.isEmpty()) {
// SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
// decodeFormats = new Vector<BarcodeFormat>();
// if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_1D, true)) {
// decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
// }
// if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_QR, true)) {
// decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
// }
// if (prefs.getBoolean(PreferencesActivity.KEY_DECODE_DATA_MATRIX, true)) {
// decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
// }
// }
if (decodeFormats==null|| decodeFormats.isEmpty()) {
decodeFormats =new Vector<BarcodeFormat>();
decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
}
hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);
if (characterSet!=null) {
hints.put(DecodeHintType.CHARACTER_SET, characterSet);
}
hints.put(DecodeHintType.NEED_RESULT_POINT_CALLBACK, resultPointCallback);
}
这里是设置 解码的类型,我们现在默认将所有类型都加入。
错误类型基本上都是:包结构、PreferencesActivity 的配置 、类可访问性的问题。根据错误提示耐心把错误解决。
返回解码结果 还记得在 CaptureActivityHandler 的 messagehandler 里注销掉的Case分支吗?现在CaptureActivity 里实现它。
public void handleDecode(Result obj, Bitmap barcode) {
inactivityTimer.onActivity();
viewfinderView.drawResultBitmap(barcode);
playBeepSoundAndVibrate();
txtResult.setText(obj.getBarcodeFormat().toString() +":"
+ obj.getText());
}
最后
ZXing的简化已基本完成,有几位是可以运行成功的?呵呵。
下面是CaptureActivity的源码:
CaputreActivitypublicclass CaptureActivityextends Activityimplements Callback {
private CaptureActivityHandler handler;
private ViewfinderView viewfinderView;
privateboolean hasSurface;
private Vector<BarcodeFormat> decodeFormats;
private String characterSet;
private TextView txtResult;
private InactivityTimer inactivityTimer;
private MediaPlayer mediaPlayer;
privateboolean playBeep;
privatestaticfinalfloat BEEP_VOLUME =0.10f;
privateboolean vibrate;
/** Called when the activity is first created.*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//初始化 CameraManager
CameraManager.init(getApplication());
viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
txtResult = (TextView) findViewById(R.id.txtResult);
hasSurface =false;
inactivityTimer =new InactivityTimer(this);
}
@Override
protectedvoid onResume() {
super.onResume();
SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
SurfaceHolder surfaceHolder = surfaceView.getHolder();
if (hasSurface) {
initCamera(surfaceHolder);
} else {
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
decodeFormats =null;
characterSet =null;
playBeep =true;
AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
if (audioService.getRingerMode()!= AudioManager.RINGER_MODE_NORMAL) {
playBeep =false;
}
initBeepSound();
vibrate =true;
}
@Override
protectedvoid onPause() {
super.onPause();
if (handler!=null) {
handler.quitSynchronously();
handler =null;
}
CameraManager.get().closeDriver();
}
@Override
protectedvoid onDestroy() {
inactivityTimer.shutdown();
super.onDestroy();
}
privatevoid initCamera(SurfaceHolder surfaceHolder) {
try {
CameraManager.get().openDriver(surfaceHolder);
} catch (IOException ioe) {
return;
} catch (RuntimeException e) {
return;
}
if (handler==null) {
handler =new CaptureActivityHandler(this, decodeFormats,
characterSet);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder,int format,int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if (!hasSurface) {
hasSurface =true;
initCamera(holder);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
hasSurface =false;
}
public ViewfinderView getViewfinderView() {
return viewfinderView;
}
public Handler getHandler() {
return handler;
}
public void drawViewfinder() {
viewfinderView.drawViewfinder();
}
public void handleDecode(Result obj, Bitmap barcode) {
inactivityTimer.onActivity();
viewfinderView.drawResultBitmap(barcode);
playBeepSoundAndVibrate();
txtResult.setText(obj.getBarcodeFormat().toString() +":"
+ obj.getText());
}
private void initBeepSound() {
if (playBeep&& mediaPlayer==null) {
// The volume on STREAM_SYSTEM is not adjustable, and users found it
// too loud,
// so we now play on the music stream.
setVolumeControlStream(AudioManager.STREAM_MUSIC);
mediaPlayer =new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setOnCompletionListener(beepListener);
AssetFileDescriptor file = getResources().openRawResourceFd(
R.raw.beep);
try {
mediaPlayer.setDataSource(file.getFileDescriptor(),
file.getStartOffset(), file.getLength());
file.close();
mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
mediaPlayer.prepare();
} catch (IOException e) {
mediaPlayer =null;
}
}
}
private static finallong VIBRATE_DURATION=200L;
private void playBeepSoundAndVibrate() {
if (playBeep&& mediaPlayer!=null) {
mediaPlayer.start();
}
if (vibrate) {
Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
vibrator.vibrate(VIBRATE_DURATION);
}
}
/**
* When the beep has finished playing, rewind to queue up another one.
*/
private final OnCompletionListener beepListener=new OnCompletionListener() {
public void onCompletion(MediaPlayer mediaPlayer) {
mediaPlayer.seekTo(0);
}
};
简化过的包结构图:
简化后的ZXing 更加方便我们了解ZXing项目 是如何解码的。只要仔细查看源码,进行单点跟踪调试,相信大家很容易能理解。
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