我正在使用OpenCV Tutorial 3代码(Camera Control)(请参阅OpenCV4Android samples)作为我的代码的基础,并且需要能够在将图像保存到{{1}后打开并操作图像}} 方法。在操作期间,我希望能够显示对图像的更改并使用onPictureTaken()
发布消息,这两者都要求我在主线程中。
根据迄今为止收到的建议,我尝试使用Toast
BroadcastReceiver
中的Activity
sendBroadcast()
JavaCameraView
。
我已更新Activity
以包含BroadcastReceiver
,并注册并取消注册,如下所示:
public class Tutorial3Activity extends Activity implements CvCameraViewListener2, OnTouchListener {
:
private ActivityReceiver activityReceiver;
:
@Override
public void onCreate(Bundle savedInstanceState) {
:
IntentFilter intentFilter = new IntentFilter();
this.registerReceiver(activityReceiver, intentFilter);
:
}
:
public void onDestroy() {
:
this.unregisterReceiver(activityReceiver);
:
}
:
private class ActivityReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Log.i(TAG, "BroadcastReceiver triggered");
if (intent.getAction().equals(Tutorial3View.IMAGE_READY)) {
Log.i(TAG, "BroadcastReceiver received");
}
}
}
}
在sendBroadcast()
中调用JavaCameraView
,如下所示:
public class Tutorial3View extends JavaCameraView {
:
public static final String IMAGE_READY = "IMAGE_READY";
private Context context;
:
public Tutorial3View(Context context, AttributeSet attrs) {
:
this.context = context;
:
}
:
public void takePicture(final String fileName) {
PictureCallback callback = new PictureCallback() {
private String mPictureFileName = fileName;
@Override
public void onPictureTaken(byte[] data, Camera camera) {
:
image_read();
:
}
};
mCamera.takePicture(null, null, callback);
}
:
public void image_read() {
Log.i(TAG, "BroadcastReceiver - send");
Intent i = new Intent();
i.setAction(IMAGE_READY);
context.sendBroadcast(i);
Log.i(TAG, "BroadcastReceiver - sent");
}
}
Manifest
包括BroadcastReceiver
,如下所示:
<receiver android:name="ActivityReceiver">
<intent-filter android:label="IMAGE_READY"></intent-filter>
</receiver>
当我拍照时,LogCat显示:
03-30 17:22:53.410: I/Sample::Tutorial3View(3174): BroadcastReceiver - send
03-30 17:22:53.410: I/Sample::Tutorial3View(3174): BroadcastReceiver - sent
但没有BroadcastReceiver triggered
或BroadcastReceiver received
的日志。
有人可以告知为什么没有收到广播?
由于
答案 0 :(得分:1)
您需要调用runOnUiThread()
方法:
runOnUiThread(new Runnable() {
@Override
public void run() {
// stuff to be done on UI Thread
}
});
答案 1 :(得分:0)
您可以使用AsyncTask来执行此操作。
使用 doInBackground()
进行背景图片处理操作,完成后,在 onPostExecute()
中显示Toast消息。