Example of Camera preview using SurfaceTexture in Android

Question

I am trying to render camera preview using SurfaceTexture. I read the document but unable to understand how it works.

Can anyone provide one sample example(very basic one) or link which uses SurfaceTexture to preview camera. I googled this but not found what I am looking for.

Thanks in advance.

Answer 1

If you want to use the Camera with TextureSurface you can implement SurfaceTextureListener interface. You'll have to implement 4 methods:

1) onSurfaceTextureAvailable - Here you setup your camera

2)onSurfaceTextureSizeChanged - In your case, the Android's camera will handle this method

3)onSurfaceTextureDestroyed - Here you destroy all camera stuff.

4) onSurfaceTextureUpdated- Update your texture here when you have something to change!

Check the example below:

    public class MainActivity extends Activity implements SurfaceTextureListener{      private Camera mCamera;     private TextureView mTextureView;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);          mTextureView = new TextureView(this);         mTextureView.setSurfaceTextureListener(this);          setContentView(mTextureView);     }      @Override     public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {         mCamera = Camera.open();          Camera.Size previewSize = mCamera.getParameters().getPreviewSize();         mTextureView.setLayoutParams(new FrameLayout.LayoutParams(                 previewSize.width, previewSize.height, Gravity.CENTER));          try {             mCamera.setPreviewTexture(surface);         } catch (IOException t) {         }          mCamera.startPreview();      }      @Override     public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {         // Ignored, the Camera does all the work for us     }      @Override     public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {         mCamera.stopPreview();         mCamera.release();         return true;     }      @Override     public void onSurfaceTextureUpdated(SurfaceTexture surface) {         // Update your view here!     } } 

Two more things: Don't forget to add the camera permissions in your project's manifest and the SurfaceTexture is available from API 11.