android视频截屏&手机录屏实现代码

本文介绍了android视频截屏&手机录屏实现代码，分享给大家，希望对大家有帮助

问题

在android中有时候我们需要对屏幕进行截屏操作，单一的截屏操作好解决可以通过activity的顶层view DecorView获取一个bitmap，得到就是当前activity上面的全部视图。

View view = activity.getWindow().getDecorView();
   view.setDrawingCacheEnabled(true);
   view.buildDrawingCache();
   Bitmap bmp = view.getDrawingCache();
   DisplayMetrics dm = new DisplayMetrics();
   activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
   Bitmap ret = Bitmap.createBitmap(bmp, 0, 0, dm.widthPixels, dm.heightPixels);
   view.destroyDrawingCache();

如果activity中包含一些视频播放器比如SurfaceView GLSurfaceView TextureView，在调用截屏代码会发现播放视频的部分是黑屏的，原因是这几种视频渲染的view通过以上代码拿到的是缓冲区不是真正的图像。

解决办法

android5.0以上系统提供了一个 MediaProjectionManager类来对手机进行录屏操作，也支持获取手机的Image图像的操作，知道了这些我们就可以通过提供的api来进行截屏操作了。

这里通过Service来操作截屏和录屏的api

1.绑定截屏的Service

Intent intent = new Intent(this, ScreenService.class);
bindService(intent, mServiceConnection, BIND_AUTO_CREATE);

public void onServiceConnected(ComponentName className, IBinder service) {
      DisplayMetrics metrics = new DisplayMetrics();
      getWindowManager().getDefaultDisplay().getMetrics(metrics);
      ScreenService.RecordBinder binder = (ScreenService.RecordBinder) service;
      recordService = binder.getRecordService();
      recordService.setConfig(metrics.widthPixels, metrics.heightPixels, metrics.densityDpi);
      mButton.setEnabled(true);
      mButton.setText(recordService.isRunning() ? "结束" : "开始");
}

2.请求权限 onActivityResult 方法中回调。

Intent captureIntent = projectionManager.createScreenCaptureIntent();
startActivityForResult(captureIntent, RECORD_REQUEST_CODE);

成功后

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == RECORD_REQUEST_CODE && resultCode == RESULT_OK) {

//######## 截屏逻辑 ########
      mediaProjection = projectionManager.getMediaProjection(resultCode, data);
      recordService.setMediaProject(mediaProjection);
      recordService.initImageReader();

}
}

3. 获取截屏

@Override
public void onClick(View view) {

//######## 截屏逻辑 ########
  Bitmap bitmap = recordService.getBitmap();
  mImageView.setImageBitmap(bitmap);
}

录屏

录屏需要初始化一些录屏参数，输入麦克风类型视频类型，保存路径等

private void initRecorder() {
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mediaRecorder.setOutputFile(
        getSavePath() + System.currentTimeMillis() + ".mp4");
    mediaRecorder.setVideoSize(width, height);
    mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024);
    mediaRecorder.setVideoFrameRate(30);
    try {
      mediaRecorder.prepare();
    } catch (IOException e) {
      e.printStackTrace();
    }
}

开始录屏

mediaRecorder.start();

保存路径

完整Service代码

public class ScreenService extends Service {
private MediaRecorder mediaRecorder;
private VirtualDisplay virtualDisplay;
private boolean running;
private int width = 720;
private int height = 1080;
private int dpi;
private ImageReader mImageReader;
private MediaProjection mediaProjection;

@Override
public IBinder onBind(Intent intent) {
  return new RecordBinder();
}

@Override
public void onCreate() {
  super.onCreate();
  running = false;
  mediaRecorder = new MediaRecorder();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
  return super.onStartCommand(intent, flags, startId);
}

@Override
public void onDestroy() {
  super.onDestroy();
}

public void setMediaProject(MediaProjection project) {
  mediaProjection = project;
}

public boolean isRunning() {
  return running;
}

public void setConfig(int width, int height, int dpi) {
  this.width = width;
  this.height = height;
  this.dpi = dpi;
}

/**
* 开始录屏
*
* @return true
*/
public boolean startRecord() {
  if (mediaProjection == null || running) {
    return false;
  }
  initRecorder();
  createVirtualDisplay();
  mediaRecorder.start();
  running = true;
  return true;
}

/**
* 结束录屏
*
* @return true
*/
public boolean stopRecord() {
  if (!running) {
    return false;
  }
  running = false;
  mediaRecorder.stop();
  mediaRecorder.reset();
  virtualDisplay.release();
  mediaProjection.stop();

return true;
}

public void setMediaProjection(MediaProjection mediaProjection) {
  this.mediaProjection = mediaProjection;
}

/**
* 初始化ImageRead参数
*/
public void initImageReader() {
  if (mImageReader == null) {
    int maxImages = 2;
    mImageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, maxImages);
    createImageVirtualDisplay();
  }
}

/**
* 创建一个录屏 Virtual
*/

private void createVirtualDisplay() {
  virtualDisplay = mediaProjection
      .createVirtualDisplay("mediaprojection", width, height, dpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mediaRecorder
          .getSurface(), null, null);
}

/**
* 创建一个ImageReader Virtual
*/
private void createImageVirtualDisplay() {
  virtualDisplay = mediaProjection
      .createVirtualDisplay("mediaprojection", width, height, dpi,
          DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mImageReader
          .getSurface(), null, null);
}

/**
* 初始化保存屏幕录像的参数
*/
private void initRecorder() {
  mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
  mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
  mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
  mediaRecorder.setOutputFile(
      getSavePath() + System.currentTimeMillis() + ".mp4");
  mediaRecorder.setVideoSize(width, height);
  mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
  mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
  mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024);
  mediaRecorder.setVideoFrameRate(30);
  try {
    mediaRecorder.prepare();
  } catch (IOException e) {
    e.printStackTrace();
  }
}

/**
* 获取一个保存屏幕录像的路径
*
* @return path
*/
public String getSavePath() {
  if (Environment.getExternalStorageState()
         .equals(Environment.MEDIA_MOUNTED)) {
    String rootDir = Environment.getExternalStorageDirectory()
                  .getAbsolutePath() + "/" +
        "ScreenRecord" + "/";

File file = new File(rootDir);
    if (!file.exists()) {
      if (!file.mkdirs()) {
        return null;
      }
    }
    return rootDir;
  } else {
    return null;
  }
}

/**
* 请求完权限后马上获取有可能为null，可以通过判断is null来重复获取。
*/
public Bitmap getBitmap() {
  Bitmap bitmap = cutoutFrame();
  if (bitmap == null) {
    getBitmap();
  }
  return bitmap;
}

/**
* 通过底层来获取下一帧的图像
*
* @return bitmap
*/
public Bitmap cutoutFrame() {
  Image image = mImageReader.acquireLatestImage();
  if (image == null) {
    return null;
  }
  int width = image.getWidth();
  int height = image.getHeight();
  final Image.Plane[] planes = image.getPlanes();
  final ByteBuffer buffer = planes[0].getBuffer();
  int pixelStride = planes[0].getPixelStride();
  int rowStride = planes[0].getRowStride();
  int rowPadding = rowStride - pixelStride * width;
  Bitmap bitmap = Bitmap.createBitmap(width +
      rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);
  bitmap.copyPixelsFromBuffer(buffer);
  return Bitmap.createBitmap(bitmap, 0, 0, width, height);
}

public class RecordBinder extends Binder {
  public ScreenService getRecordService() {
    return ScreenService.this;
  }
}

demo下载

github

来源：http://www.jianshu.com/p/2a330e3cfdac