如何调用onSurfaceTextureAvailable和onSurfaceTextureDestroyed方法,从而实现重新预览相机
时间: 2024-02-25 22:56:12 浏览: 25
要调用onSurfaceTextureAvailable和onSurfaceTextureDestroyed方法,您需要在SurfaceTexture上创建一个TextureView或者SurfaceView,并设置SurfaceTextureListener。当SurfaceTexture可用时,onSurfaceTextureAvailable方法将被调用。当SurfaceTexture被销毁时,onSurfaceTextureDestroyed方法将被调用。
下面是一个简单的示例代码:
```java
public class MainActivity extends AppCompatActivity implements TextureView.SurfaceTextureListener {
private Camera mCamera;
private TextureView mTextureView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextureView = findViewById(R.id.texture_view);
mTextureView.setSurfaceTextureListener(this);
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
mCamera = Camera.open();
try {
mCamera.setPreviewTexture(surface);
mCamera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
// Ignored, 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) {
// Invoked every time there's a new Camera preview frame
}
}
```
在这个示例中,当SurfaceTexture被创建并可用时,onSurfaceTextureAvailable方法将被调用。这里我们打开相机并将SurfaceTexture设置为预览。当SurfaceTexture被销毁时,onSurfaceTextureDestroyed方法将被调用。这里我们停止预览并释放相机资源。