Android4.1 無預覽拍照

1、setParameters failed解決方法   2、無預覽拍照   客戶的需求千奇百怪，有要靜默安裝功能的，下載編譯好的ROM，在ROM中加入自己的應用程序實現靜默安裝，為了盈利好無恥啊。現在要實現無預覽拍照功能，哥們又哭笑不得，客戶是上帝，木有辦法。據說無預覽拍照在4.1中無法實現了。因為牽涉到用戶隱私問題。     看代碼吧，其實實現特簡單。主要是思路問題。   [java]   <SPAN style="FONT-SIZE: 14px">public class NoPreviewTakePicActivity extends Activity{       private Camera mCamera;       private CameraPreview mPreview;       private ToneGenerator mTone;       private static final int OPTION_SNAPSHOT = 0;          @Override       public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           mPreview = new CameraPreview(this);           setContentView(R.layout.main);           addContentView(mPreview, new LayoutParams(1, 1));// 在Layout中加入了一個寬高為1的一個預覽區域。但用戶確實看不到，就莫名其妙的拍照了。        }          @Override       public boolean onOptionsItemSelected(MenuItem item) {           int itemId = item.getItemId();           switch(itemId){           case OPTION_SNAPSHOT:               mCamera.takePicture(shutterCallback, null, jpegCallback);               break;           }           return true;       }       private PictureCallback jpegCallback = new PictureCallback(){              public void onPictureTaken(byte[] data, Camera camera) {               Parameters ps = camera.getParameters();               if(ps.getPictureFormat() == PixelFormat.JPEG){                   String path = save(data);                   Uri uri = Uri.fromFile(new File(path));                   Intent intent = new Intent();                   intent.setAction("android.intent.action.VIEW");                   intent.setDataAndType(uri, "image/jpeg");                   startActivity(intent);               }           }       };              private ShutterCallback shutterCallback = new ShutterCallback(){           public void onShutter() {               if(mTone == null){                   mTone = new ToneGenerator(AudioManager.STREAM_MUSIC,ToneGenerator.MAX_VOLUME);               }               mTone.startTone(ToneGenerator.TONE_PROP_BEEP2);           }       };              private String save(byte[] data){           String path = "/mnt/sdcard/"+System.currentTimeMillis()+".jpg";           try {               if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){                   String storage = Environment.getExternalStorageDirectory().toString();                   StatFs fs = new StatFs(storage);                   long available = fs.getAvailableBlocks()*fs.getBlockSize();                   if(available<data.length){                       return null;                   }                   File file = new File(path);                   if(!file.exists()){                       file.createNewFile();                   }                   FileOutputStream fos = new FileOutputStream(file);                   fos.write(data);                   fos.close();               }           } catch (Exception e) {               e.printStackTrace();               return null;           }           return path;       }          @Override       public boolean onCreateOptionsMenu(Menu menu) {           menu.add(0, OPTION_SNAPSHOT, 0, R.string.snapshot);           return super.onCreateOptionsMenu(menu);       }          class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {              SurfaceHolder mHolder;              public CameraPreview(Context context) {               super(context);               mHolder = getHolder();               mHolder.addCallback(this);               //mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // 4.0+ auto            }           public void surfaceCreated(SurfaceHolder holder) {               mCamera = Camera.open(1);               try {                   mCamera.setPreviewDisplay(holder);               } catch (IOException exception) {                   mCamera.release();                   mCamera = null;               }           }              public void surfaceDestroyed(SurfaceHolder holder) {               mCamera.stopPreview();               mCamera.release();               mCamera = null;           }              public void surfaceChanged(SurfaceHolder holder, int format, int w,                   int h) {               Camera.Parameters parameters = mCamera.getParameters();               Size size = parameters.getPreviewSize();               Log.e(VIEW_LOG_TAG, "size.width="+size.width+"size.height="+size.height);               // setPreviewSize 寬高不能大於 parameters.getPreviewSize()，否者會出現java.lang.RuntimeException: setParameters failed錯誤                //parameters.setPreviewSize(800, 600);                mCamera.setParameters(parameters);               mCamera.startPreview();           }                  }   }</SPAN>     public class NoPreviewTakePicActivity extends Activity{ private Camera mCamera; private CameraPreview mPreview; private ToneGenerator mTone; private static final int OPTION_SNAPSHOT = 0;   @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mPreview = new CameraPreview(this); setContentView(R.layout.main); addContentView(mPreview, new LayoutParams(1, 1));// 在Layout中加入了一個寬高為1的一個預覽區域。但用戶確實看不到，就莫名其妙的拍照了。 }   @Override public boolean onOptionsItemSelected(MenuItem item) { int itemId = item.getItemId(); switch(itemId){ case OPTION_SNAPSHOT: mCamera.takePicture(shutterCallback, null, jpegCallback); break; } return true; } private PictureCallback jpegCallback = new PictureCallback(){   public void onPictureTaken(byte[] data, Camera camera) { Parameters ps = camera.getParameters(); if(ps.getPictureFormat() == PixelFormat.JPEG){    String path = save(data);    Uri uri = Uri.fromFile(new File(path));        Intent intent = new Intent();        intent.setAction("android.intent.action.VIEW");        intent.setDataAndType(uri, "image/jpeg");        startActivity(intent); } } };   private ShutterCallback shutterCallback = new ShutterCallback(){ public void onShutter() { if(mTone == null){ mTone = new ToneGenerator(AudioManager.STREAM_MUSIC,ToneGenerator.MAX_VOLUME); } mTone.startTone(ToneGenerator.TONE_PROP_BEEP2); } };   private String save(byte[] data){ String path = "/mnt/sdcard/"+System.currentTimeMillis()+".jpg"; try { if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ String storage = Environment.getExternalStorageDirectory().toString(); StatFs fs = new StatFs(storage); long available = fs.getAvailableBlocks()*fs.getBlockSize(); if(available<data.length){ return null; } File file = new File(path); if(!file.exists()){ file.createNewFile(); } FileOutputStream fos = new FileOutputStream(file); fos.write(data); fos.close(); } } catch (Exception e) { e.printStackTrace(); return null; } return path; }   @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(0, OPTION_SNAPSHOT, 0, R.string.snapshot); return super.onCreateOptionsMenu(menu); }   class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {   SurfaceHolder mHolder;   public CameraPreview(Context context) { super(context); mHolder = getHolder(); mHolder.addCallback(this); //mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); // 4.0+ auto } public void surfaceCreated(SurfaceHolder holder) { mCamera = Camera.open(1); try { mCamera.setPreviewDisplay(holder); } catch (IOException exception) { mCamera.release(); mCamera = null; } }   public void surfaceDestroyed(SurfaceHolder holder) { mCamera.stopPreview(); mCamera.release(); mCamera = null; }   public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { Camera.Parameters parameters = mCamera.getParameters(); Size size = parameters.getPreviewSize(); Log.e(VIEW_LOG_TAG, "size.width="+size.width+"size.height="+size.height); // setPreviewSize 寬高不能大於 parameters.getPreviewSize()，否者會出現java.lang.RuntimeException: setParameters failed錯誤 //parameters.setPreviewSize(800, 600); mCamera.setParameters(parameters); mCamera.startPreview(); }   } }