写一个安卓uvccamera结合photoview实时显示的例子

好的，下面是一个基于 Android UVC Camera 和 PhotoView 实时显示的简单示例：

1.添加依赖项

在 app 的 build.gradle 文件中添加以下依赖项：

implementation 'com.github.chrisbanes:PhotoView:2.3.0'
implementation 'com.github.saki4510t:UVCCamera:2.3.11'

2.添加权限

在 AndroidManifest.xml 文件中添加以下权限：

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.usb.host" />
<uses-feature android:name="android.hardware.camera" />

3.添加布局

在 activity 的布局文件中添加一个 PhotoView，用于实时显示预览：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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>

4.初始化 UVCCamera

在 activity 中，初始化 UVCCamera 并将预览输出到 PhotoView：

public class MainActivity extends AppCompatActivity {

    private PhotoView mPhotoView;

    private UVCCamera mUVCCamera;
    private UVCCameraTextureView mUVCCameraTextureView;

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

        mPhotoView = findViewById(R.id.photo_view);

        // 初始化 UVCCamera
        mUVCCameraTextureView = new UVCCameraTextureView(this);
        mUVCCamera = new UVCCamera();
        mUVCCamera.open(mUVCCameraTextureView);
        mUVCCamera.setPreviewSize(UVCCamera.DEFAULT_PREVIEW_WIDTH, UVCCamera.DEFAULT_PREVIEW_HEIGHT, UVCCamera.FRAME_FORMAT_YUYV);
        mUVCCamera.setPreviewDisplay(mUVCCameraTextureView);
        mUVCCamera.startPreview();

        // 实时显示预览
        mUVCCameraTextureView.setCallback(new SurfaceTextureListener() {
            @Override
            public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
                mUVCCameraTextureView.setSurfaceTexture(surface);
            }

            @Override
            public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

            }

            @Override
            public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
                return true;
            }

            @Override
            public void onSurfaceTextureUpdated(SurfaceTexture surface) {
                mPhotoView.postInvalidate();
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // 释放 UVCCamera
        mUVCCamera.stopPreview();
        mUVCCamera.close();
        mUVCCameraTextureView = null;
    }
}

这样，一个简单的基于 Android UVC Camera 和 PhotoView 实时显示的示例就完成了。