カメラプレビューを使用して自分でカメラを作成したアプリを作成しています。そして、私のAndroid 4.1デバイスでは問題なく動作します (カメラが開いて写真を撮ります)。しかし、Android 2.3 デバイスで試してみると、framelayout.addView(camera_view)この行をコメントしてもアプリがクラッシュしないため、アプリがクラッシュします。これが私のコードです（測定値はデバイスの画面に合わせるためです）：
private void setUpCamera() {
camera_view = new CameraSurfaceView(getApplicationContext());
frame_layout = (FrameLayout) findViewById(R.id.image_frame);
// v it's a square that I draw
v.getLayoutParams().width = (int) ((720/4) + (5*screenDensity));
v.getLayoutParams().height = (int) ((720/4) + (5*screenDensity));
// img it's the imageview where I display the photo
img.getLayoutParams().width = (int) (720/4);
img.getLayoutParams().height = (int) (720/4);
frame_layout.getLayoutParams().width = (int) (720/4);
frame_layout.getLayoutParams().height = (int) (960/4);
frame_layout.addView(camera_view);
}
camera_view クラスは次のとおりです。
public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback{
private SurfaceHolder m_holder;
public Camera camera = null;
public CameraSurfaceView(Context context) {
super(context);
m_holder = getHolder();
m_holder.addCallback(this);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Camera.Parameters params = camera.getParameters();
if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
camera.setDisplayOrientation(90);
} else {
camera.setDisplayOrientation(0);
}
params.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO);
params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
params.setSceneMode(Camera.Parameters.SCENE_MODE_AUTO);
params.setWhiteBalance(Camera.Parameters.WHITE_BALANCE_AUTO);
params.setExposureCompensation(0);
params.setJpegQuality(100);
List<Size> sizes = params.getSupportedPictureSizes();
Camera.Size size = sizes.get(0);
for(int i=0;i<sizes.size();i++)
{
if(sizes.get(i).width > size.width)
size = sizes.get(i);
}
params.setPreviewSize(size.width, size.height);
params.setPictureSize(size.width, size.height);
camera.setParameters(params);
camera.startPreview();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
try {
camera.setPreviewDisplay(m_holder);
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
}
public void capture(Camera.PictureCallback jpeghandler){
camera.takePicture(null, null, jpeghandler);
}
}