在TextureView上显示一张图片

要在 `TextureView` 上显示一张图片，可以按照以下步骤进行：

1. 将图片转换成 `Bitmap` 对象。可以使用 `BitmapFactory` 类中的 `decodeResource()` 方法将资源文件中的图片转换为 `Bitmap` 对象，如下所示：

   Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.my_image);

2. 获取 `TextureView` 对象，并设置 `SurfaceTextureListener` 监听器。在监听器的 `onSurfaceTextureAvailable()` 方法中可以获取 `SurfaceTexture` 对象，并将 `Bitmap` 绘制到 `SurfaceTexture` 中。

   TextureView textureView = findViewById(R.id.texture_view);
   textureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
       @Override
       public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
           // 将 Bitmap 绘制到 SurfaceTexture 中
           Canvas canvas = surfaceTexture.lockCanvas();
           canvas.drawBitmap(bitmap, 0, 0, null);
           surfaceTexture.unlockCanvasAndPost(canvas);
       }

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

       @Override
       public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
           return false;
       }

       @Override
       public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {}
   });

3. 最后，在布局文件中添加 `TextureView` 控件即可。

   <TextureView
       android:id="@+id/texture_view"
       android:layout_width="match_parent"
       android:layout_height="match_parent" />

完整示例代码如下：

public class MainActivity extends AppCompatActivity {

    private Bitmap bitmap;

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

        // 将图片转换为 Bitmap 对象
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.my_image);

        // 获取 TextureView 对象，并设置 SurfaceTextureListener 监听器
        TextureView textureView = findViewById(R.id.texture_view);
        textureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
            @Override
            public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
                // 将 Bitmap 绘制到 SurfaceTexture 中
                Canvas canvas = surfaceTexture.lockCanvas();
                canvas.drawBitmap(bitmap, 0, 0, null);
                surfaceTexture.unlockCanvasAndPost(canvas);
            }

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

            @Override
            public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
                return false;
            }

            @Override
            public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {}
        });
    }
}

布局文件：

<TextureView
    android:id="@+id/texture_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />