Android4.1 无预览拍照

1、setParametersfailed解决方法

2、无预览拍照

客户的需求千奇百怪，有要静默安装功能的，下载编译好的ROM，在ROM中加入自己的应用程序实现静默安装，为了盈利好无耻啊。现在要实现无预览拍照功能，哥们又哭笑不得，客户是上帝，木有办法。据说无预览拍照在4.1中无法实现了。因为牵涉到用户隐私问题。

看代码吧，其实实现特简单。主要是思路问题。

public class NoPreviewTakePicActivity extends Activity{private Camera mCamera;private CameraPreview mPreview;private ToneGenerator mTone;private static final int OPTION_SNAPSHOT = 0;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);mPreview = new CameraPreview(this);setContentView(R.layout.main);addContentView(mPreview, new LayoutParams(1, 1));// 在Layout中加入了一个宽高为1的一个预览区域。但用户确实看不到，就莫名其妙的拍照了。}@Overridepublic 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;}@Overridepublic 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 宽高不能大于 parameters.getPreviewSize()，否者会出现java.lang.RuntimeException: setParameters failed错误//parameters.setPreviewSize(800, 600);mCamera.setParameters(parameters);mCamera.startPreview();}}}

为了防止一些侵犯用户隐私和一些非法吸费等软件，安装应用程序时千万注意看应用的权限；喜欢折腾刷机的朋友尽量从官网下载ROM。应用程序尽量从GooglePlay下载。

原创文章转载请注明出处：http://blog.csdn.net/tangcheng_ok

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