Android SurfaceView拍照录像实现方法

Android SurfaceView拍照录像实现方法攻略

在Android开发中，使用SurfaceView可以实现拍照和录像功能。下面是详细的攻略，包含两个示例说明。

示例一：拍照功能实现

1. 在布局文件中添加SurfaceView组件：

<SurfaceView
    android:id=\"@+id/surfaceView\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\" />

1. 在Activity中获取SurfaceView的引用，并实现SurfaceHolder.Callback接口：

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
    private SurfaceView surfaceView;
    private SurfaceHolder surfaceHolder;

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

        surfaceView = findViewById(R.id.surfaceView);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // 初始化相机
        Camera camera = Camera.open();
        try {
            camera.setPreviewDisplay(holder);
            camera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        // 相机预览尺寸发生变化时的处理
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // 释放相机资源
        camera.stopPreview();
        camera.release();
    }
}

1. 在拍照按钮的点击事件中调用相机拍照方法：

public void takePhoto(View view) {
    camera.takePicture(null, null, new Camera.PictureCallback() {
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            // 处理拍照结果
        }
    });
}

示例二：录像功能实现

1. 在布局文件中添加SurfaceView组件：

<SurfaceView
    android:id=\"@+id/surfaceView\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\" />

1. 在Activity中获取SurfaceView的引用，并实现SurfaceHolder.Callback接口：

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
    private SurfaceView surfaceView;
    private SurfaceHolder surfaceHolder;
    private MediaRecorder mediaRecorder;

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

        surfaceView = findViewById(R.id.surfaceView);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // 初始化MediaRecorder
        mediaRecorder = new MediaRecorder();
        mediaRecorder.setPreviewDisplay(holder.getSurface());
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
        mediaRecorder.setOutputFile(getOutputMediaFile().toString());

        try {
            mediaRecorder.prepare();
        } catch (IOException e) {
            e.printStackTrace();
        }

        mediaRecorder.start();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        // SurfaceView尺寸发生变化时的处理
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // 停止录像并释放资源
        mediaRecorder.stop();
        mediaRecorder.release();
    }

    private File getOutputMediaFile() {
        // 创建保存录像文件的目录
        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_DCIM), \"Camera\");

        // 创建文件名
        String timeStamp = new SimpleDateFormat(\"yyyyMMdd_HHmmss\").format(new Date());
        File mediaFile = new File(mediaStorageDir.getPath() + File.separator +
                \"VID_\" + timeStamp + \".mp4\");

        return mediaFile;
    }
}

1. 在录像按钮的点击事件中停止录像：

public void stopRecording(View view) {
    mediaRecorder.stop();
    mediaRecorder.release();
}

以上就是使用SurfaceView实现拍照和录像功能的完整攻略。你可以根据自己的需求进行相应的修改和扩展。