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;
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助。