Passing values from android to flutter but not from main activity - flutter

Question

i'm implementing a third party android sdk in flutter and i want a message to be passed from android to flutter when sdk starts
i have implemented the sdk using platform channel just need to work on the callback code. In the code there is a function called onChannelJoin i want to send message to flutter when this function is called
Main Activity
public class MainActivity extends FlutterActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
GeneratedPluginRegistrant.registerWith(this);
final String CHANNEL = "samples.flutter.io/screen_record";
new MethodChannel(getFlutterView(), CHANNEL).setMethodCallHandler(
new MethodChannel.MethodCallHandler() {
#Override
public void onMethodCall(MethodCall call, MethodChannel.Result result) {
// TODO
if (call.method.equals("startScreenShare")) {
Intent intent = new Intent(MainActivity.this , HelloAgoraScreenSharingActivity.class);
startActivity(intent);
} else {
result.notImplemented();
}
}
});
}
}
ScreenSharingActivity
public class HelloAgoraScreenSharingActivity extends Activity {
private static final String LOG_TAG = "AgoraScreenSharing";
private static final int PERMISSION_REQ_ID_RECORD_AUDIO = 22;
private ScreenCapture mScreenCapture;
private GLRender mScreenGLRender;
private RtcEngine mRtcEngine;
private boolean mIsLandSpace = false;
private void initModules() {
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
if (mScreenGLRender == null) {
mScreenGLRender = new GLRender();
}
if (mScreenCapture == null) {
mScreenCapture = new ScreenCapture(getApplicationContext(), mScreenGLRender, metrics.densityDpi);
}
mScreenCapture.mImgTexSrcConnector.connect(new SinkConnector<ImgTexFrame>() {
#Override
public void onFormatChanged(Object obj) {
Log.d(LOG_TAG, "onFormatChanged " + obj.toString());
}
#Override
public void onFrameAvailable(ImgTexFrame frame) {
Log.d(LOG_TAG, "onFrameAvailable " + frame.toString());
if (mRtcEngine == null) {
return;
}
AgoraVideoFrame vf = new AgoraVideoFrame();
vf.format = AgoraVideoFrame.FORMAT_TEXTURE_OES;
vf.timeStamp = frame.pts;
vf.stride = frame.mFormat.mWidth;
vf.height = frame.mFormat.mHeight;
vf.textureID = frame.mTextureId;
vf.syncMode = true;
vf.eglContext14 = mScreenGLRender.getEGLContext();
vf.transform = frame.mTexMatrix;
mRtcEngine.pushExternalVideoFrame(vf);
}
});
mScreenCapture.setOnScreenCaptureListener(new ScreenCapture.OnScreenCaptureListener() {
#Override
public void onStarted() {
Log.d(LOG_TAG, "Screen Record Started");
}
#Override
public void onError(int err) {
Log.d(LOG_TAG, "onError " + err);
switch (err) {
case ScreenCapture.SCREEN_ERROR_SYSTEM_UNSUPPORTED:
break;
case ScreenCapture.SCREEN_ERROR_PERMISSION_DENIED:
break;
}
}
});
WindowManager wm = (WindowManager) getApplicationContext()
.getSystemService(Context.WINDOW_SERVICE);
int screenWidth = wm.getDefaultDisplay().getWidth();
int screenHeight = wm.getDefaultDisplay().getHeight();
if ((mIsLandSpace && screenWidth < screenHeight) ||
(!mIsLandSpace) && screenWidth > screenHeight) {
screenWidth = wm.getDefaultDisplay().getHeight();
screenHeight = wm.getDefaultDisplay().getWidth();
}
setOffscreenPreview(screenWidth, screenHeight);
if (mRtcEngine == null) {
try {
mRtcEngine = RtcEngine.create(getApplicationContext(), "Agora_id", new IRtcEngineEventHandler() {
#Override
public void onJoinChannelSuccess(String channel, int uid, int elapsed) {
Log.d(LOG_TAG, "onJoinChannelSuccess " + channel + " " + elapsed);
}
#Override
public void onWarning(int warn) {
Log.d(LOG_TAG, "onWarning " + warn);
}
#Override
public void onError(int err) {
Log.d(LOG_TAG, "onError " + err);
}
#Override
public void onAudioRouteChanged(int routing) {
Log.d(LOG_TAG, "onAudioRouteChanged " + routing);
}
});
} catch (Exception e) {
Log.e(LOG_TAG, Log.getStackTraceString(e));
throw new RuntimeException("NEED TO check rtc sdk init fatal error\n" + Log.getStackTraceString(e));
}
mRtcEngine.setChannelProfile(Constants.CHANNEL_PROFILE_LIVE_BROADCASTING);
mRtcEngine.enableVideo();
if (mRtcEngine.isTextureEncodeSupported()) {
mRtcEngine.setExternalVideoSource(true, true, true);
} else {
throw new RuntimeException("Can not work on device do not supporting texture" + mRtcEngine.isTextureEncodeSupported());
}
mRtcEngine.setVideoProfile(Constants.VIDEO_PROFILE_360P, true);
mRtcEngine.setClientRole(Constants.CLIENT_ROLE_BROADCASTER);
}
}
private void deInitModules() {
RtcEngine.destroy();
mRtcEngine = null;
if (mScreenCapture != null) {
mScreenCapture.release();
mScreenCapture = null;
}
if (mScreenGLRender != null) {
mScreenGLRender.quit();
mScreenGLRender = null;
}
}
/**
* Set offscreen preview.
*
* #param width offscreen width
* #param height offscreen height
* #throws IllegalArgumentException
*/
public void setOffscreenPreview(int width, int height) throws IllegalArgumentException {
if (width <= 0 || height <= 0) {
throw new IllegalArgumentException("Invalid offscreen resolution");
}
mScreenGLRender.init(width, height);
}
private void startCapture() {
mScreenCapture.start();
}
private void stopCapture() {
mScreenCapture.stop();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hello_agora_screen_sharing);
}
public void onLiveSharingScreenClicked(View view) {
Button button = (Button) view;
boolean selected = button.isSelected();
button.setSelected(!selected);
if (button.isSelected()) {
initModules();
startCapture();
String channel = "ss_test" + System.currentTimeMillis();
channel = "ss_test";
button.setText("stop");
mRtcEngine.muteAllRemoteAudioStreams(true);
mRtcEngine.muteAllRemoteVideoStreams(true);
mRtcEngine.joinChannel(null, channel, "", 0);
} else {
button.setText("start");
mRtcEngine.leaveChannel();
stopCapture();
}
}
#Override
protected void onDestroy() {
super.onDestroy();
deInitModules();
}
}
Dart Code
const platform = const MethodChannel('samples.flutter.io/screen_record');
try {
final int result = await platform.invokeMethod('startScreenShare');
} on PlatformException catch (e) {}
setState(() {
});