android中什么是surface实例,在Android中使用SurfaceTexture进行相机预览的示例

如果要将Camera与TextureSurface一起使用，可以实现SurfaceTextureListener接口。你必须实现4种方法：

1)onSurfaceTextureAvailable – 在这里设置你的相机

2)onSurfaceTextureSizeChanged – 在你的情况下，Android的相机将处理这个方法

3)onSurfaceTextureDestroyed – 在这里你销毁所有相机的东西。

4)onSurfaceTextureUpdated-当你有改变的东西时，在这里更新你的纹理！

请查看以下示例：

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!

}

}

还有两件事：不要忘记在项目的清单中添加摄像头权限，并且可以从API 11获得SurfaceTexture。