TextureView 简介 SurfaceView

Class Overview
A TextureView can be used to display a content stream. Such a content stream can for instance be a video or an OpenGL scene场景. The content stream can come from the application‘s process as well as a remote远程 process.
TextureView can only be used in a hardware accelerated硬件加速 window. When rendered in呈现在 software, TextureView will draw nothing.
Unlike SurfaceView, TextureView does not create a separate单独的 window but behaves as a regular像平常的 View. This key difference allows a TextureView to be moved, transformed, animated动画, etc. For instance, you can make a TextureView semi-translucent半透明 by calling myView.setAlpha(0.5f).
Using a TextureView is simple: all you need to do is get its SurfaceTexture. The SurfaceTexture can then be used to render展示 content. The following example demonstrates how to render the camera preview into a TextureView:
A TextureView‘s SurfaceTexture can be obtained或的 either by invoking引用 getSurfaceTexture() or by using a TextureView.SurfaceTextureListener. It is important to know that a SurfaceTexture is available only after the TextureView is attached to a window (and onAttachedToWindow() has been invoked.) It is therefore highly recommended推荐 you use a listener to be notified when the SurfaceTexture becomes available.
It is important to note that only one producer can use the TextureView. For instance, if you use a TextureView to display the camera preview, you cannot uselockCanvas() to draw onto the TextureView at the same time.

@SuppressWarnings("deprecation")
public class MainActivity extends Activity implements TextureView.SurfaceTextureListener {
    private Camera mCamera;//权限【android.permission.CAMERA】
    private TextureView mTextureView;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mTextureView = new TextureView(this);
        mTextureView.setSurfaceTextureListener(this);
        mTextureView.setRotation(45.0f);
        mTextureView.setAlpha(0.5f);
        setContentView(mTextureView);
    }
    public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
        mCamera = Camera.open();
        try {
            mCamera.setPreviewTexture(surface);
            mCamera.startPreview();
        } catch (IOException ioe) {
        }
    }
    public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
        // Ignored, Camera does all the work for us
    }
    public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
        mCamera.stopPreview();
        mCamera.release();
        return true;
    }
    public void onSurfaceTextureUpdated(SurfaceTexture surface) {
        // Invoked every time there‘s a new Camera preview frame
    }
}