surfaceTexture 更新图片的代码
时间: 2023-07-02 17:08:12 浏览: 90
以下是使用 SurfaceTexture 更新图片的示例代码:
```java
public class MainActivity extends AppCompatActivity implements SurfaceTextureListener {
private Camera mCamera;
private SurfaceTexture mSurfaceTexture;
private ImageView mImageView;
private Handler mHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mImageView = findViewById(R.id.image_view);
mHandler = new Handler();
// 初始化摄像头
mCamera = Camera.open();
mCamera.setDisplayOrientation(90);
// 初始化 SurfaceTexture
mSurfaceTexture = new SurfaceTexture(0);
mSurfaceTexture.setOnFrameAvailableListener(new SurfaceTexture.OnFrameAvailableListener() {
@Override
public void onFrameAvailable(SurfaceTexture surfaceTexture) {
mHandler.post(new Runnable() {
@Override
public void run() {
mSurfaceTexture.updateTexImage();
mImageView.invalidate();
}
});
}
});
// 将 SurfaceTexture 与摄像头绑定
try {
mCamera.setPreviewTexture(mSurfaceTexture);
} catch (IOException e) {
e.printStackTrace();
}
// 开始预览
mCamera.startPreview();
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
mCamera.stopPreview();
mCamera.release();
return true;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
// 当有新的帧可用时,会触发 mSurfaceTexture.setOnFrameAvailableListener() 中的 onFrameAvailable() 方法
}
}
```
其中,`mSurfaceTexture.updateTexImage()` 方法会更新 SurfaceTexture 中的图像,`mImageView.invalidate()` 方法会强制 ImageView 刷新界面,以显示最新的图像。在 `onSurfaceTextureUpdated()` 方法中,我们可以对更新的图像进行进一步处理。