Чтобы начать работу с приложением камеры в Android, я написал некоторый код для выполнения следующих шагов: 1.Preview
2.Capture Image
3.Save Image
4.Preview Again
Вот весь код для выполнения вышеуказанных шагов:
public class CameraActivity extends Activity implements SurfaceHolder.Callback,Camera.AutoFocusCallback,Camera.PictureCallback
{
String SD_CARD_TEMP_DIR = Environment.getExternalStorageDirectory() + File.separator + "tmpPhoto.jpg";
private Camera mCamera;
boolean mPreviewRunning = false;
ImageButton takePictureButton;
SurfaceView mSurfaceView;
SurfaceHolder mSurfaceHolder;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().setFormat(PixelFormat.TRANSLUCENT);
setContentView(R.layout.camera);
mSurfaceView = (SurfaceView)findViewById(R.id.surface);
takePictureButton = (ImageButton)findViewById(R.id.capture_img);
takePictureButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mCamera.takePicture(null, null, CameraActivity.this);
}
});
mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
Intent takePictureFromCameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
takePictureFromCameraIntent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(SD_CARD_TEMP_DIR)));
startActivityForResult(takePictureFromCameraIntent, 1);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
//Picture taken from camera
if(requestCode == 1)
{
if(resultCode == Activity.RESULT_OK)
{
File f = new File(SD_CARD_TEMP_DIR);
try{
Uri capturedImage =
Uri.parse(android.provider.MediaStore.Images.Media.insertImage(getContentResolver(), f.getAbsolutePath(),
null, null));
Log.i("camera", "Selected image: "+capturedImage.toString());
f.delete();
}catch (FileNotFoundException e) {
// TODO: handle exception
e.printStackTrace();
}
}
}
else
{
Log.i("camera", "Result Code was: " + resultCode);
}
}
@Override
public void onAutoFocus(boolean success, Camera camera) {
// TODO Auto-generated method stub
camera.takePicture(null, null, this);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
if(mPreviewRunning)
{
mCamera.stopPreview();
}
Camera.Parameters p = mCamera.getParameters();
p.setPreviewSize(width, height);
p.setPictureFormat(PixelFormat.JPEG);
mCamera.setParameters(p);
try
{
mCamera.setPreviewDisplay(holder);
}catch(IOException ie)
{
ie.printStackTrace();
}
mCamera.startPreview();
mPreviewRunning = true;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
mCamera = Camera.open();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();
}
}
Когда я запускаю приведенный выше код, при запуске самого приложения оно выдает мне сообщение о том, что оно неожиданно остановилось,Я сделал здесь какую-нибудь ошибку?Я хочу знать, потому что я новичок в Camera.Пожалуйста, помогите мне!!!Спасибо