Android 拍照程序開發

一：目標

完成自定義的拍照程序，可預覽

二：組件準備

  1.SurfaceView用於預覽【SurfaceHolder】

  2.Camera用於拍照

  3.自定義Camera.PictureCallback接口實現類，用於讀取照片bytes流，在此處添加存儲照片的代碼

  4.二個輔助Button shootBtn 用於拍照  continueBtn用於拍照後的繼續預覽

三：實現注意

public class TakePictureActivity extends FragmentActivity implements SurfaceHolder.Callback{


private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
private Button mBtn;
private Button mContinueBtn;
private Camera mCamera;
private int defaultCameraId = -1;
private static final String TAG = "TakePictureActivity";


@Override
protected void onCreate(Bundle bundle) {
// TODO Auto-generated method stub
super.onCreate(bundle);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_take_picture);
mSurfaceView = (SurfaceView)findViewById(R.id.take_pic_surface_view);
mBtn = (Button)findViewById(R.id.take_pic_shot_btn);
mContinueBtn = (Button)findViewById(R.id.take_pic_goon);


mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
int cameraCount = Camera.getNumberOfCameras();
Camera.CameraInfo ci = new Camera.CameraInfo();
for(int i = 0; i < cameraCount; i++){
Camera.getCameraInfo(i, ci);
if(ci.facing == Camera.CameraInfo.CAMERA_FACING_BACK){
defaultCameraId = i;
break;
}
}


}


private Camera.PictureCallback pl = new PictureListener();

public void doClick(View view){
switch(view.getId()){
case R.id.take_pic_shot_btn:
if(mCamera != null){
mCamera.takePicture(null, pl,pl);
}
mBtn.setEnabled(false);
mContinueBtn.setEnabled(true);
break;
case R.id.take_pic_goon:
if(mCamera != null){
mCamera.startPreview();
}
mBtn.setEnabled(true);
mContinueBtn.setEnabled(false);
break;
}

}

@Override
protected void onResume() {
// TODO Auto-generated method stub
Log.d(TAG,"onResume");
super.onResume();
mCamera = Camera.open(defaultCameraId);
}


@Override
protected void onPause() {
// TODO Auto-generated method stub
Log.d(TAG,"onPause");
super.onPause();
mCamera.release();
mCamera = null;
}


@Override
public void surfaceCreated(SurfaceHolder holder) {
Log.d(TAG,"surfaceCreated");
// TODO Auto-generated method stub
try {
if (mCamera != null) {
mCamera.setPreviewDisplay(holder);
}
} catch (IOException exception) {
Log.e(TAG, "IOException caused by setPreviewDisplay()", exception);
}
}


@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Log.d(TAG,"surfaceChanged");
// TODO Auto-generated method stub
mCamera.startPreview();


}


@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
Log.d(TAG,"surfaceDestroyed");
if (mCamera != null) {
mCamera.stopPreview();
}
}
}

我直接將自己編寫的代碼放上去了