拍照

横向，全屏，摄像头权限

<activity android:name=".MainActivity"
                  android:label="@string/app_name" android:screenOrientation="landscape">

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);

<uses-permission android:name="android.permission.CAMERA"/>

使用了surfaceview控件，

.Camera.takePicture(ShutterCallback shutter,PictureCallback raw,PictureCallback jpeg)

该方法三个参数都为回调方法，最后一个为压缩后的图片，因为处理是异步的，该方法后不能立刻使用camera.startPreview()方法，容易黑屏，应该在回调方法完成后执行，进而防止照片不动

public class MainActivity extends Activity {    private View layout;    private Camera camera;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,        WindowManager.LayoutParams.FLAG_FULLSCREEN);        setContentView(R.layout.main);                layout = this.findViewById(R.id.buttonlayout);                SurfaceView surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView);        surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        surfaceView.getHolder().setFixedSize(176, 144);        surfaceView.getHolder().setKeepScreenOn(true);        surfaceView.getHolder().addCallback(new SurfaceCallback());    }        public void takepicture(View v){    if(camera!=null){    switch (v.getId()) {    case R.id.takepicture:    camera.takePicture(null, null, new MyPictureCallback());    break;    case R.id.autofocus:    camera.autoFocus(null);    break;    }    }    }

.Camera.takePicture(ShutterCallback shutter, PictureCallback raw, PictureCallback jpeg)

该方法三个参数都为回调方法，最后一个为压缩后的图片，因为处理是异步的，该方法后不能立刻使用camera.startPreview()方法，容易黑屏，应该在回调方法完成后执行，进而防止照片不动

 

       private final class MyPictureCallback implements PictureCallback{public void onPictureTaken(byte[] data, Camera camera) {try {File jpgFile = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis()+".jpg");FileOutputStream outStream = new FileOutputStream(jpgFile);outStream.write(data);outStream.close();camera.startPreview();} catch (Exception e) {e.printStackTrace();}}        }

    
   

private final class SurfaceCallback implements Callback{public void surfaceCreated(SurfaceHolder holder) {try{camera = Camera.open();//打开摄像头Camera.Parameters parameters = camera.getParameters();//Log.i("MainActivity", parameters.flatten());parameters.setPreviewSize(800, 480);parameters.setPreviewFrameRate(5);parameters.setPictureSize(1024,768);parameters.setJpegQuality(80);camera.setParameters(parameters);camera.setPreviewDisplay(holder);camera.startPreview();//开始预览}catch (Exception e) {e.printStackTrace();}}public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}public void surfaceDestroyed(SurfaceHolder holder) {if(camera!=null){camera.release();camera = null;}}        }@Overridepublic boolean onTouchEvent(MotionEvent event) {if(event.getAction() == MotionEvent.ACTION_DOWN){layout.setVisibility(ViewGroup.VISIBLE);return true;}return super.onTouchEvent(event);}  }