Why is the Android Camera2 preview not showing. It's a dark scene and the TextureView listener is not getting called on activity launch

Question

I followed the basic sample code from Google for Android Camera2 API. https://github.com/googlesamples/android-Camera2Basic.

After I integrated it into my app, it is showing dark scene. No camera output can be seen. It was working fine before integration.

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Why is the TextureView listener not getting triggered? Is there some other issue apart from this code?

Answer 1

The problem had nothing to do with the Java code. It worked after I added android:hardwareAccelerated="true" in the CameraActivity <activity> tag in the Manifest.xml file.

What I found strange in this solution was that the Camera app worked without this property, but after integrating it into a different app, it didn't.

If anyone has any idea as to why it worked before, but not after integration, kindly share your answer.

<activity android:name=".CameraActivity"
            android:hardwareAccelerated="true"
            android:screenOrientation="portrait" />