关于Android Camera 新手求助
本帖最后由 syl7752 于 2012-02-10 11:15:02 编辑 一个测试用例 多处调用Camera 弹出错误fail to connect to camera service
部分代码如下：
private void initializeMessageLooper(final int cameraId) throws Exception{
final ConditionVariable startDone = new ConditionVariable();
new Thread() {
@Override
public void run() {
Log.v(TAG, "start loopRun");
// Set up a looper to be used by camera.
Looper.prepare();
// Save the looper so that we can terminate this thread
// after we are done with it.
mLooper = Looper.myLooper();
try{
mCamera = Camera.open(cameraId);
}catch (Exception e) {
// TODO: handle exception
}
Log.v(TAG, "camera is opened");
startDone.open();
Looper.loop(); // Blocks forever until Looper.quit() is called.
if (LOGV) Log.v(TAG, "initializeMessageLooper: quit.");
}
}.start();
Log.v(TAG, "start waiting for looper");
if (!startDone.block(WAIT_FOR_COMMAND_TO_COMPLETE)) {
Log.v(TAG, "initializeMessageLooper: start timeout");
fail("initializeMessageLooper: start timeout");
}
}
private void terminateMessageLooper() throws Exception {
mLooper.quit();
// Looper.quit() is asynchronous. The looper may still has some
// preview callbacks in the queue after quit is called. The preview
// callback still uses the camera object (setHasPreviewCallback).
// After camera is released, RuntimeException will be thrown from
// the method. So we need to join the looper thread here.
mLooper.getThread().join();
mCamera.release();
mCamera = null;
}
@UiThreadTest
public void testTakePicture() throws Exception {
int nCameras = Camera.getNumberOfCameras();
for (int id = 0; id < nCameras; id++) {
Log.v(TAG, "Camera id=" + id);
testTakePictureByCamera(id);
}
}
private void testTakePictureByCamera(int cameraId) throws Exception {
initializeMessageLooper(cameraId);
Size pictureSize = mCamera.getParameters().getPictureSize();
mCamera.setPreviewDisplay(getActivity().getSurfaceView().getHolder());
mCamera.startPreview();
mCamera.autoFocus(mAutoFocusCallback);
assertTrue(waitForFocusDone());
mCamera.autoFocus(mAutoFocusCallback);
assertTrue(waitForFocusDone());
mJpegData = null;
mCamera.takePicture(mShutterCallback, mRawPictureCallback, mJpegPictureCallback);
waitForSnapshotDone();
terminateMessageLooper();
assertTrue(mShutterCallbackResult);
assertTrue(mJpegPictureCallbackResult);
assertNotNull(mJpegData);
Bitmap b = BitmapFactory.decodeByteArray(mJpegData, 0, mJpegData.length);
assertEquals(pictureSize.width, b.getWidth());
assertEquals(pictureSize.height, b.getHeight());
}