写一个uvccamera结合photoview的实例

好的，以下是一个利用UVC摄像头和PhotoView库实现的实例：

1. 首先，在你的项目中导入UVCCamera和PhotoView库。

2. 在布局文件中添加一个TextureView和一个PhotoView，用于显示摄像头预览和处理手势操作：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    
    <TextureView
        android:id="@+id/texture_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.github.chrisbanes.photoview.PhotoView
        android:id="@+id/photo_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

3. 在Activity中获取TextureView和PhotoView的引用，并初始化UVCCamera：

public class MainActivity extends AppCompatActivity implements SurfaceTextureListener{

    private TextureView mTextureView;
    private PhotoView mPhotoView;
    private UVCCamera mUVCCamera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextureView = findViewById(R.id.texture_view);
        mTextureView.setSurfaceTextureListener(this);

        mPhotoView = findViewById(R.id.photo_view);
        mPhotoView.setMaximumScale(10); // 设置最大缩放比例

        mUVCCamera = new UVCCamera();
        mUVCCamera.open();
        mUVCCamera.setPreviewSize(640, 480);
        mUVCCamera.setPreviewDisplay(mTextureView.getSurfaceTexture());
        mUVCCamera.startPreview();
    }

    ...
}

4. 在Activity中实现PhotoView的手势操作监听器，根据手势操作更新UVCCamera的预览画面：

public class MainActivity extends AppCompatActivity implements SurfaceTextureListener, OnScaleChangeListener, OnViewDragListener {

    ...

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
        mUVCCamera.setPreviewSize(width, height);
        mUVCCamera.setPreviewDisplay(surface);
        mUVCCamera.startPreview();
    }

    @Override
    public void onScaleChange(float scaleFactor, float focusX, float focusY) {
        Matrix matrix = new Matrix();
        matrix.setScale(scaleFactor, scaleFactor, focusX, focusY);
        mPhotoView.setDisplayMatrix(matrix);

        // 更新UVCCamera的预览画面
        mUVCCamera.updatePreviewFrame(mTextureView.getBitmap());
    }

    @Override
    public void onViewDrag(float dx, float dy) {
        Matrix matrix = new Matrix();
        matrix.setTranslate(dx, dy);
        mPhotoView.setDisplayMatrix(matrix);

        // 更新UVCCamera的预览画面
        mUVCCamera.updatePreviewFrame(mTextureView.getBitmap());
    }

    ...
}

5. 最后，在Activity中记得要释放UVCCamera资源：

public class MainActivity extends AppCompatActivity implements SurfaceTextureListener, OnScaleChangeListener, OnViewDragListener {

    ...

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mUVCCamera.stopPreview();
        mUVCCamera.close();
    }

    ...
}

这样，你就可以利用UVC摄像头和PhotoView库实现一个可以缩放、旋转的摄像头预览了。