本文主要將的是：使用 Camera API 采集視頻數據並保存到文件，分別使用 SurfaceView、TextureView 來預覽 Camera 數據，取到 NV21 的數據回調。

註： 需要權限：<uses-permission android:name="android.permission.CAMERA" />

一、預覽 Camera 數據

做過Android開發的人一般都知道，有兩種方法能夠做到這一點：SurfaceView、TextureView。

下面是使用SurfaceView預覽數據的方式：

SurfaceView surfaceView;
Camera camera;

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

    surfaceView = (SurfaceView) findViewById(R.id.surface_view);
    surfaceView.getHolder().addCallback(this);

    // 打開攝像頭並將展示方向旋轉90度
    camera = Camera.open();
    camera.setDisplayOrientation(90);

}

//------ Surface 預覽 -------
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
    try {
        camera.setPreviewDisplay(surfaceHolder);
        camera.startPreview();
    } catch (IOException e) {
        e.printStackTrace();
    }
}


@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int w, int h) {

}

@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
    camera.release();
}

下面是使用TextureView預覽數據的方式：

    TextureView textureView;
    Camera camera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textureView = (TextureView) findViewById(R.id.texture_view);
        textureView.setSurfaceTextureListener(
 
this);// 打開攝像頭並將展示方向旋轉90度
        camera = Camera.open();
        camera.setDisplayOrientation(90);
    }
//------ Texture 預覽 -------
    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int i, int i1) {
        try {
            camera.setPreviewTexture(surfaceTexture);
            camera.startPreview();
        } 
 
catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int i, int i1) {

    }

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

    @Override
    public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {

    }

Android 音視頻開發(四)：使用 Camera API 采集視頻數據