public class BarCodeTestActivity extends Activity {   private TextView resultTextView; private EditText qrStrEditText; private ImageView qrImgImageView; private String time;  private File file = null;  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);     resultTextView = (TextView) this.findViewById(R.id.tv_scan_result);   qrStrEditText = (EditText) this.findViewById(R.id.et_qr_string);   qrImgImageView = (ImageView) this.findViewById(R.id.iv_qr_image);      Button scanBarCodeButton = (Button) this.findViewById(R.id.btn_scan_barcode);   scanBarCodeButton.setOnClickListener(new OnClickListener() {  @Override public void onClick(View v) { //打開掃描界面掃描條形碼或二維碼 Intent openCameraIntent = new Intent(BarCodeTestActivity.this,CaptureActivity.class); startActivityForResult(openCameraIntent, 0); } }); qrImgImageView.setOnLongClickListener(new OnLongClickListener() {  @Override public boolean onLongClick(View v) { // 長按識別二維碼   saveCurrentImage(); return true; } });     Button generateQRCodeButton = (Button) this.findViewById(R.id.btn_add_qrcode);   generateQRCodeButton.setOnClickListener(new OnClickListener() {  @Override public void onClick(View v) { try { String contentString = qrStrEditText.getText().toString(); if (!contentString.equals("")) { //根據字符串生成二維碼圖片并顯示在界面上，第二個參數為圖片的大小（350*350） Bitmap qrCodeBitmap = EncodingHandler.createQRCode(contentString, 350); qrImgImageView.setImageBitmap(qrCodeBitmap); }else { //提示文本不能是空的 Toast.makeText(BarCodeTestActivity.this, "Text can not be empty", Toast.LENGTH_SHORT).show(); }  } catch (WriterException e) { // TODO Auto-generated catch block e.printStackTrace(); } } });  }   //這種方法狀態欄是空白，顯示不了狀態欄的信息  private void saveCurrentImage()  {   //獲取當前屏幕的大小   int width = getWindow().getDecorView().getRootView().getWidth();   int height = getWindow().getDecorView().getRootView().getHeight();   //生成相同大小的圖片   Bitmap temBitmap = Bitmap.createBitmap( width, height, Bitmap.Config.ARGB_8888 );   //找到當前頁面的根布局   View view = getWindow().getDecorView().getRootView();   //設置緩存   view.setDrawingCacheEnabled(true);   view.buildDrawingCache();   //從緩存中獲取當前屏幕的圖片,創建一個DrawingCache的拷貝，因為DrawingCache得到的位圖在禁用后會被回收   temBitmap = view.getDrawingCache();   SimpleDateFormat df = new SimpleDateFormat("yyyymmddhhmmss");   time = df.format(new Date());   if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())){    file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/screen",time + ".png");    if(!file.exists()){     file.getParentFile().mkdirs();     try {      file.createNewFile();     } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }    }    FileOutputStream fos = null;    try {     fos = new FileOutputStream(file);     temBitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);     fos.flush();     fos.close();    } catch (FileNotFoundException e) {     e.printStackTrace();    } catch (IOException e) {     // TODO Auto-generated catch block     e.printStackTrace();    }    new Thread(new Runnable() {     @Override     public void run() {      String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/screen/" + time + ".png";      final Result result = parseQRcodeBitmap(path);      runOnUiThread(new Runnable() {       public void run() {       if(null!=result){       resultTextView.setText(result.toString());       }else{        Toast.makeText(BarCodeTestActivity.this, "無法識別", Toast.LENGTH_LONG).show();       }       }      });     }    }).start();    //禁用DrawingCahce否則會影響性能 ,而且不禁止會導致每次截圖到保存的是緩存的位圖    view.setDrawingCacheEnabled(false);   }  }    //解析二維碼圖片,返回結果封裝在Result對象中  private com.google.zxing.Result parseQRcodeBitmap(String bitmapPath){   //解析轉換類型UTF-8   Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();   hints.put(DecodeHintType.CHARACTER_SET, "utf-8");   //獲取到待解析的圖片   BitmapFactory.Options options = new BitmapFactory.Options();    //如果我們把inJustDecodeBounds設為true，那么BitmapFactory.decodeFile(String path, Options opt)   //并不會真的返回一個Bitmap給你，它僅僅會把它的寬，高取回來給你   options.inJustDecodeBounds = true;   //此時的bitmap是null，這段代碼之后，options.outWidth 和 options.outHeight就是我們想要的寬和高了   Bitmap bitmap = BitmapFactory.decodeFile(bitmapPath,options);   //我們現在想取出來的圖片的邊長（二維碼圖片是正方形的）設置為400像素   /**    options.outHeight = 400;    options.outWidth = 400;    options.inJustDecodeBounds = false;    bitmap = BitmapFactory.decodeFile(bitmapPath, options);   */   //以上這種做法，雖然把bitmap限定到了我們要的大小，但是并沒有節約內存，如果要節約內存，我們還需要使用inSimpleSize這個屬性   options.inSampleSize = options.outHeight / 400;   if(options.inSampleSize <= 0){    options.inSampleSize = 1; //防止其值小于或等于0   }   /**    * 輔助節約內存設置    *    * options.inPreferredConfig = Bitmap.Config.ARGB_4444; // 默認是Bitmap.Config.ARGB_8888    * options.inPurgeable = true;    * options.inInputShareable = true;    */   options.inJustDecodeBounds = false;   bitmap = BitmapFactory.decodeFile(bitmapPath, options);    //新建一個RGBLuminanceSource對象，將bitmap圖片傳給此對象   RGBLuminanceSource rgbLuminanceSource = new RGBLuminanceSource(bitmap);   //將圖片轉換成二進制圖片   BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(rgbLuminanceSource));   //初始化解析對象   QRCodeReader reader = new QRCodeReader();   //開始解析   Result result = null;   try {    result = reader.decode(binaryBitmap, hints);   } catch (Exception e) {    // TODO: handle exception   }      return result;  }  @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); //處理掃描結果（在界面上顯示） if (resultCode == RESULT_OK) { Bundle bundle = data.getExtras(); String scanResult = bundle.getString("result"); resultTextView.setText(scanResult); } } } 

public class RGBLuminanceSource extends LuminanceSource { private byte bitmapPixels[];  protected RGBLuminanceSource(Bitmap bitmap) { super(bitmap.getWidth(), bitmap.getHeight());  // 首先，要取得該圖片的像素數組內容 int[] data = new int[bitmap.getWidth() * bitmap.getHeight()]; this.bitmapPixels = new byte[bitmap.getWidth() * bitmap.getHeight()]; bitmap.getPixels(data, 0, getWidth(), 0, 0, getWidth(), getHeight());  // 將int數組轉換為byte數組，也就是取像素值中藍色值部分作為辨析內容 for (int i = 0; i < data.length; i++) { this.bitmapPixels[i] = (byte) data[i]; } }  @Override public byte[] getMatrix() { // 返回我們生成好的像素數據 return bitmapPixels; }   @Override public byte[] getRow(int y, byte[] row) { // 這里要得到指定行的像素數據 System.arraycopy(bitmapPixels, y * getWidth(), row, 0, getWidth()); return row; } } 

public class CaptureActivity extends Activity implements Callback {  private CaptureActivityHandler handler; private ViewfinderView viewfinderView; private boolean hasSurface; private Vector<BarcodeFormat> decodeFormats; private String characterSet; private InactivityTimer inactivityTimer; private MediaPlayer mediaPlayer; private boolean playBeep; private static final float BEEP_VOLUME = 0.10f; private boolean vibrate; private Button cancelScanButton;  /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.camera);  CameraManager.init(getApplication()); viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view); cancelScanButton = (Button) this.findViewById(R.id.btn_cancel_scan); hasSurface = false; inactivityTimer = new InactivityTimer(this); }  @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;  //quit the scan view cancelScanButton.setOnClickListener(new OnClickListener() {  @Override public void onClick(View v) { CaptureActivity.this.finish(); } }); }  @Override protected void onPause() { super.onPause(); if (handler != null) { handler.quitSynchronously(); handler = null; } CameraManager.get().closeDriver(); }  @Override protected void onDestroy() { inactivityTimer.shutdown(); super.onDestroy(); }  /** * Handler scan result * @param result * @param barcode */ public void handleDecode(Result result, Bitmap barcode) { inactivityTimer.onActivity(); playBeepSoundAndVibrate(); String resultString = result.getText(); //FIXME if (resultString.equals("")) { //掃描失敗 Toast.makeText(CaptureActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show(); }else { // System.out.println("Result:"+resultString); Intent resultIntent = new Intent(); Bundle bundle = new Bundle(); bundle.putString("result", resultString); resultIntent.putExtras(bundle); this.setResult(RESULT_OK, resultIntent); } CaptureActivity.this.finish(); }  private void 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(); } 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 final long 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); } };   } 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:background="@android:color/white"  android:orientation="vertical" >    <Button   android:id="@+id/btn_scan_barcode"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:layout_marginTop="30dp"   android:text="Open camera" />    <LinearLayout   android:orientation="horizontal"   android:layout_marginTop="10dp"   android:layout_width="fill_parent"   android:layout_height="wrap_content">      <TextView   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:textColor="@android:color/black"   android:textSize="18sp"   android:text="Scan result：" />      <TextView   android:id="@+id/tv_scan_result"   android:layout_width="fill_parent"   android:textSize="18sp"   android:textColor="@android:color/black"   android:layout_height="wrap_content" />  </LinearLayout>    <EditText   android:id="@+id/et_qr_string"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:layout_marginTop="30dp"   android:hint="Input the text"/>    <Button   android:id="@+id/btn_add_qrcode"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:text="Generate QRcode" />    <ImageView   android:id="@+id/iv_qr_image"   android:layout_width="250dp"   android:layout_height="250dp"   android:scaleType="fitXY"   android:layout_marginTop="10dp"   android:layout_gravity="center"/>   </LinearLayout>