Recently I used cctv camera app but if not have a camera in device, showing this logcat and app is died
java.lang.RuntimeException: Unable to start activity ComponentInfo{kr.co.iosystem.blackeyeonandroid/kr.co.iosystem.blackeyeonandroid.BlackEyeActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at org.webrtc.PeerConnectionFactory.createVideoSource(PeerConnectionFactory.java:111)
at kr.co.iosystem.blackeyeonandroid.BlackEyeActivity.onCreate(MainActivity.java:235)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
and my source MainActivity.java
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String nameOfFrontFacingDevice = VideoCapturerAndroid.getNameOfFrontFacingDevice();
String nameOfBackFacingDevice = VideoCapturerAndroid.getNameOfBackFacingDevice();
VideoCapturerAndroid capturer = VideoCapturerAndroid.create(nameOfFrontFacingDevice);
.
.
.
}
if not have a camera. capturer this return null so , I test
if (capturer == null || capturer.equals("") == true) {
try {
rebootProcess = Runtime.getRuntime().exec(new String[]{"su", "-c", "reboot"});
} catch (IOException e) {
e.printStackTrace();
}
}
and I execute app. I rebooted my device but I want if not have a camera, showing black color background
If its connected to camera then it showing GLSurfaceView
glview = (GLSurfaceView) findViewById(R.id.glview);
VideoRendererGui.setView(glview, null) ;
try {
. . . .
} catch {
}
perhaps, I use fragment? please advice for me. I think
if (capturer == null || capturer.equals("") == true) {
// showing black background ??..
}
but I don't know showing black background part.
thanks.
@update
MainActivity.java (full oncreate)
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String nameOfFrontFacingDevice = VideoCapturerAndroid.getNameOfFrontFacingDevice();
if (nameOfFrontFacingDevice != null) {
VideoCapturerAndroid capturer = VideoCapturerAndroid.create(nameOfFrontFacingDevice);
MediaConstraints videoConstraints = new MediaConstraints();
VideoSource videoSource = peerConnectionFactory.createVideoSource(capturer, videoConstraints);
localVideoTrack = peerConnectionFactory.createVideoTrack(VIDEO_TRACK_ID, videoSource);
glview =(GLSurfaceView) findViewById.(R.id.showing);
VideoRendererGui.setView(glview, null);
try {
renderer = VideoRendererGui.createGui(0,0,100,100, VideoRendererGui.ScalingType.SCALE_ASPECT_FILL, true);
localVideoTrack.addRenderer(renderer);
} catch (Exception e) {
e.printStackTrace();
}
mediaStream = peerConnectionFactory.createLocalMediaStream(LOCAL_MEDIA_STREAM_ID);
mediaStream.addTrack(localVideoTrack);
} else {
//space
}
I changed my source your advice. but occur nullpointerException
In else part. how can I programmatically?
If its an app where you are using camera then, the app should not install in phones that lack this feature. In your manifest put:
<uses-feature android:name="android.hardware.camera"
required="true" />
[EDIT]
According to VideoCapturerAndroid source, the following line will return null if no camera exist:
String nameOfFrontFacingDevice = VideoCapturerAndroid.getNameOfFrontFacingDevice();
So, in your case this must itself be coming null. However, you are passing the name to create. I think this is where NPE is coming from:
VideoCapturerAndroid capturer = VideoCapturerAndroid.create(nameOfFrontFacingDevice); // name might be null
So, you should put up a null check here:
if (nameOfFrontFacingDevice != null) {
VideoCapturerAndroid capturer = VideoCapturerAndroid.create(nameOfFrontFacingDevice);
} else {
// Other stuff
}
[EDIT 2]
For devices with no camera, your capturer would still be coming out null and that is creating the problem with call to peerConnectionFactory.createVideoSource(capturer, videoConstraints). Hence, we can make sure we call it only if we have the camera and avoid the NPE. Now, we run into another problem in glview.onResume() call in activity onResume(). So, we must initialise that before we check for camera. Check the code below for suggested fix:
String nameOfFrontFacingDevice = VideoCapturerAndroid.getNameOfFrontFacingDevice();
String nameOfBackFacingDevice = VideoCapturerAndroid.getNameOfBackFacingDevice();
Log.i(TAG, "VideoCapturerAndroid.getNameOfFrontFacingDevice() = " + nameOfFrontFacingDevice);
Log.i(TAG, "VideoCapturerAndroid.getNameOfBackFacingDevice() = " + nameOfBackFacingDevice);
VideoCapturerAndroid capturer = VideoCapturerAndroid.create(nameOfFrontFacingDevice);
// Initialising the glview here
glview = (GLSurfaceView) findViewById(R.id.glview);
VideoRendererGui.setView(glview, null);
MediaConstraints videoConstraints = new MediaConstraints();
if (capturer == null || capturer.equals("")) {
Log.d(TAG, "not camera");
}
// Doing further processing only if capturer is not null
else {
VideoSource videoSource = peerConnectionFactory.createVideoSource(capturer, videoConstraints);
localVideoTrack = peerConnectionFactory.createVideoTrack(VIDEO_TRACK_ID, videoSource);
try {
renderer = VideoRendererGui.createGui(0, 0, 100, 100, VideoRendererGui.ScalingType.SCALE_ASPECT_FILL, true);
renderer_sub = VideoRendererGui.createGui(72, 72, 25, 25, VideoRendererGui.ScalingType.SCALE_ASPECT_FILL, true);
localVideoTrack.addRenderer(renderer_sub);
localVideoTrack.addRenderer(renderer);
} catch (Exception e) {
e.printStackTrace();
}
mediaStream = peerConnectionFactory.createLocalMediaStream(LOCAL_MEDIA_STREAM_ID);
mediaStream.addTrack(localVideoTrack);
ImageButton imageButton = (ImageButton) findViewById(R.id.backbutton);
imageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
moveTaskToBack(true);
finish();
android.os.Process.killProcess(android.os.Process.myPid());
}
});
}
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