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这篇文章主要介绍Android5.0以上版本如何实现录屏,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
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1既然是录制视频,我们应该有一个按钮控制开始和结束。
2在录制之前,需要先判断一下Android系统的版本是否大于5.0,并且动态申请一下权限(读写,录音,照相机),这一步可以在点开始按钮的时候执行
if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 102); } if (ContextCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, 103); } if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, 104); } Intent intent = null; if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) { intent = mediaProjectionManager.createScreenCaptureIntent(); startActivityForResult(intent, 101);//正常情况是要执行到这里的,作用是申请捕捉屏幕 } else { ShowUtil.showToast(context, "Android版本太低,无法使用该功能"); }
3定义MediaProjection和MediaProjectionManager等一些其他必要的变量
boolean isrun = false;//用来标记录屏的状态private MediaProjectionManager mediaProjectionManager; private MediaProjection mediaProjection;//录制视频的工具private int width, height, dpi;//屏幕宽高和dpi,后面会用到 private ScreenRecorder screenRecorder;//这个是自己写的录视频的工具类,下文会放完整的代码 Thread thread;//录视频要放在线程里去执行
在onCreat里写好实例化
mediaProjectionManager = (MediaProjectionManager) context.getSystemService(MEDIA_PROJECTION_SERVICE); WindowManager manager = this.getWindowManager(); DisplayMetrics outMetrics = new DisplayMetrics(); manager.getDefaultDisplay().getMetrics(outMetrics); width = outMetrics.widthPixels; height = outMetrics.heightPixels; dpi = outMetrics.densityDpi;
4我们在onActivityResult回调方法中,来处理返回的事件
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == 102) { Toast.makeText(context, "缺少读写权限", Toast.LENGTH_SHORT).show(); return; } if (requestCode == 103) { Toast.makeText(context, "缺少录音权限", Toast.LENGTH_SHORT).show(); return; } if (requestCode == 104) { Toast.makeText(context, "缺少相机权限", Toast.LENGTH_SHORT).show(); return; } if (requestCode != 101) { Log.e("HandDrawActivity", "error requestCode =" + requestCode); } if (resultCode != RESULT_OK) { Toast.makeText(context, "捕捉屏幕被禁止", Toast.LENGTH_SHORT).show(); return; } mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data); if (mediaProjection != null) { screenRecorder = new ScreenRecorder(width, height, mediaProjection, dpi); } thread = new Thread() { @Override public void run() { screenRecorder.startRecorder();//跟ScreenRecorder有关的下文再说,总之这句话的意思就是开始录屏的意思 } }; thread.start(); binding.startPlayer.setText("停止");//开始和停止我用的同一个按钮,所以开始录屏之后把按钮文字改一下 isrun = true;//录屏状态改成真 }
5先放上ScreenRecorder代码,只想要结果的朋友呢,直接把类粘贴走,把报错的地方改一改(在我自己的项目里可是不报错的),就实现了录制屏幕的功能了,还想看看的,可以往下看看
import android.hardware.display.DisplayManager; import android.media.MediaCodec; import android.media.MediaCodecInfo; import android.media.MediaFormat; import android.media.MediaMuxer; import android.media.MediaRecorder; import android.media.projection.MediaProjection; import android.os.Build; import android.os.Environment; import android.text.TextUtils; import android.util.Log; import android.view.Surface; import com.coremedia.iso.boxes.Container; import com.googlecode.mp4parser.authoring.Movie; import com.googlecode.mp4parser.authoring.Track; import com.googlecode.mp4parser.authoring.builder.DefaultMp4Builder; import com.googlecode.mp4parser.authoring.container.mp4.MovieCreator; import com.googlecode.mp4parser.authoring.tracks.AppendTrack; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.RandomAccessFile; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import java.util.ArrayList; import java.util.LinkedList; import java.util.List; public class ScreenRecorder { private int mWidth, mHeight, mDensty; private MediaProjection mediaProjection; private MediaCodec.BufferInfo mBufferInfo; private MediaCodec mEncorder; private Surface mInputSurface; private MediaMuxer mMuxer; private boolean isQuit = false; private boolean mMuxerStarted = false; private int mTrackIndex; private String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/cache"; private MediaRecorder mediaRecorder; public ScreenRecorder(int mWidth, int mHeight, MediaProjection mediaProjection, int mDensty) { this.mWidth = mWidth; this.mHeight = mHeight; this.mediaProjection = mediaProjection; this.mDensty = mDensty; File file = new File(path); if (!file.exists()) { file.mkdirs(); } } public void startRecorder() { prepareRecorder(); startLuYin(); startRecording(); } public void stop() { isQuit = true; releaseEncorders(1); ListfilePath = new ArrayList<>(); filePath.add(path + "/APlanyinpin.amr"); filePath.add(path + "/APlanshipin.mp4"); joinVideo(filePath, path); } public void destory() { releaseEncorders(0); } private void startLuYin() { File file = new File(path, "APlanyinpin.amr"); mediaRecorder = new MediaRecorder(); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT); mediaRecorder.setOutputFile(file.getAbsolutePath()); try { mediaRecorder.prepare(); mediaRecorder.start(); Log.e("HandDrawActivity", "已经开始录音"); } catch (IOException e) { e.printStackTrace(); } } private void prepareRecorder() { mBufferInfo = new MediaCodec.BufferInfo(); //元数据,描述bytebuffer的数据,尺寸,偏移 //创建格式化对象 MIMI_TYPE 传入的 video/avc 是H264编码格式 MediaFormat format = MediaFormat.createVideoFormat("video/avc", mWidth, mHeight); int frameRate = 45; format.setInteger(MediaFormat.KEY_BIT_RATE, 3000000); format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface); format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 10); format.setInteger(MediaFormat.KEY_FRAME_RATE, frameRate); format.setInteger(MediaFormat.KEY_CHANNEL_COUNT, 1); format.setInteger(MediaFormat.KEY_CAPTURE_RATE, frameRate); format.setInteger(MediaFormat.KEY_REPEAT_PREVIOUS_FRAME_AFTER, 1000000 / frameRate); try { mEncorder = MediaCodec.createEncoderByType("video/avc"); mEncorder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE); mInputSurface = mEncorder.createInputSurface(); mEncorder.start(); } catch (IOException e) { e.printStackTrace(); releaseEncorders(0); } } private void startRecording() { File saveFile = new File(path, "APlanshipin.mp4"); try { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { mMuxer = new MediaMuxer(saveFile.getAbsolutePath(), MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4); mediaProjection.createVirtualDisplay("SCREENRECORDER", mWidth, mHeight, mDensty, DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC, mInputSurface, null, null); drainEncoder(); } } catch (Exception e) { e.printStackTrace(); } } private void drainEncoder() { while (!isQuit) { Log.e("TAG", "drain....."); int bufferIndex = mEncorder.dequeueOutputBuffer(mBufferInfo, 0); if (bufferIndex == MediaCodec.INFO_TRY_AGAIN_LATER) { try { Thread.sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } if (bufferIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) { mTrackIndex = mMuxer.addTrack(mEncorder.getOutputFormat()); if (!mMuxerStarted && mTrackIndex >= 0) { mMuxer.start(); mMuxerStarted = true; Log.e("HandDrawActivity", "已经开始录屏"); } } if (bufferIndex >= 0) { Log.e("TAG", "drain...write.."); ByteBuffer bufferData = mEncorder.getOutputBuffer(bufferIndex); if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) { mBufferInfo.size = 0; } if (mBufferInfo.size != 0) { if (mMuxerStarted) { bufferData.position(mBufferInfo.offset); bufferData.limit(mBufferInfo.offset + mBufferInfo.size); mMuxer.writeSampleData(mTrackIndex, bufferData, mBufferInfo); } } mEncorder.releaseOutputBuffer(bufferIndex, false); if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) { break; } } } Log.e("HandDrawActivity", "已经结束录屏"); } private void releaseEncorders(int i) { if (mediaProjection != null) { mediaProjection.stop(); } mBufferInfo = null; if (mEncorder != null) { mEncorder.stop(); } mInputSurface = null; if (mMuxer != null && i == 1) { mMuxer.stop(); } if (mediaRecorder != null) { mediaRecorder.stop(); mediaRecorder.reset(); mediaRecorder.release(); } } private boolean joinVideo(List filePaths, String resultPath) { Log.e("HandDrawActivity", "准备合成中"); boolean result = false; if (filePaths == null || filePaths.size() <= 0 || TextUtils.isEmpty(resultPath)) { throw new IllegalArgumentException(); } if (filePaths.size() == 1) { // 只有一个视频片段,不需要合并 return true; } try { Movie[] inMovies = new Movie[filePaths.size()]; for (int i = 0; i < filePaths.size(); i++) { Log.e("HandDrawActivity", "filePaths=" + filePaths.get(i)); File f = new File(filePaths.get(i)); if (f.exists()) { inMovies[i] = MovieCreator.build(filePaths.get(i)); } } // 分别取出音轨和视频 List
6从startRecorder方法说起
public void startRecorder() { prepareRecorder();//录视频前的准备 startLuYin();//直接录音频(不用准备) startRecording();//录视频 }
录音的方法
private void startLuYin() { File file = new File(path, "APlanyinpin.amr"); mediaRecorder = new MediaRecorder(); mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);//声音来源,麦克 mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);//音频格式,默认,其实就是上面定义好的amr了,除此之外还有mp4 mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);//编码格式,问题是我不知道编码格式对什么有影响,是音质高低还是文件大小还是解析快慢,等我有时间去专门研究一下 mediaRecorder.setOutputFile(file.getAbsolutePath()); try { mediaRecorder.prepare(); mediaRecorder.start(); Log.e("HandDrawActivity", "已经开始录音"); } catch (IOException e) { e.printStackTrace(); } }
//录视频前的准备工作 private void prepareRecorder() { mBufferInfo = new MediaCodec.BufferInfo(); //元数据,描述bytebuffer的数据,尺寸,偏移 //创建格式化对象 MIMI_TYPE 传入的 video/avc 是H264编码格式 MediaFormat format = MediaFormat.createVideoFormat("video/avc", mWidth, mHeight); int frameRate = 45; format.setInteger(MediaFormat.KEY_BIT_RATE, 3000000); format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface); format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 10); format.setInteger(MediaFormat.KEY_FRAME_RATE, frameRate); format.setInteger(MediaFormat.KEY_CHANNEL_COUNT, 1); format.setInteger(MediaFormat.KEY_CAPTURE_RATE, frameRate); format.setInteger(MediaFormat.KEY_REPEAT_PREVIOUS_FRAME_AFTER, 1000000 / frameRate);//编码器的设置,具体是设置的啥我也不太清楚,但是网上查一查都是这么写的!!! try { mEncorder = MediaCodec.createEncoderByType("video/avc"); mEncorder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE); mInputSurface = mEncorder.createInputSurface(); mEncorder.start();//让编码器先跑起来 } catch (IOException e) { e.printStackTrace(); releaseEncorders(0); } }
这里也是准备工作
private void startRecording() { File saveFile = new File(path, "APlanshipin.mp4"); try { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { mMuxer = new MediaMuxer(saveFile.getAbsolutePath(), MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);//百度一下MediaMuxer,讲的很详细的 mediaProjection.createVirtualDisplay("SCREENRECORDER", mWidth, mHeight, mDensty, DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC, mInputSurface, null, null); drainEncoder(); } } catch (Exception e) { e.printStackTrace(); } }
这个就是开始写视频文件了
private void drainEncoder() { while (!isQuit) { Log.e("TAG", "drain....."); int bufferIndex = mEncorder.dequeueOutputBuffer(mBufferInfo, 0); if (bufferIndex == MediaCodec.INFO_TRY_AGAIN_LATER) { try { Thread.sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } if (bufferIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) { mTrackIndex = mMuxer.addTrack(mEncorder.getOutputFormat()); if (!mMuxerStarted && mTrackIndex >= 0) { mMuxer.start(); mMuxerStarted = true; Log.e("HandDrawActivity", "已经开始录屏"); } } if (bufferIndex >= 0) { Log.e("TAG", "drain...write.."); ByteBuffer bufferData = mEncorder.getOutputBuffer(bufferIndex); if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) { mBufferInfo.size = 0; } if (mBufferInfo.size != 0) { if (mMuxerStarted) { bufferData.position(mBufferInfo.offset); bufferData.limit(mBufferInfo.offset + mBufferInfo.size); mMuxer.writeSampleData(mTrackIndex, bufferData, mBufferInfo); } } mEncorder.releaseOutputBuffer(bufferIndex, false); if ((mBufferInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) { break; } } } Log.e("HandDrawActivity", "已经结束录屏"); }
这个就是把录好的音频和视频合并成mp4的方法了,也是点击停止录屏的时候用到的
private boolean joinVideo(ListfilePaths, String resultPath) { Log.e("HandDrawActivity", "准备合成中"); boolean result = false; if (filePaths == null || filePaths.size() <= 0 || TextUtils.isEmpty(resultPath)) { throw new IllegalArgumentException(); } if (filePaths.size() == 1) { // 只有一个视频片段,不需要合并 return true; } try { Movie[] inMovies = new Movie[filePaths.size()]; for (int i = 0; i < filePaths.size(); i++) { Log.e("HandDrawActivity", "filePaths=" + filePaths.get(i)); File f = new File(filePaths.get(i)); if (f.exists()) { inMovies[i] = MovieCreator.build(filePaths.get(i)); } } // 分别取出音轨和视频 List videoTracks = new LinkedList<>(); List audioTracks = new LinkedList<>(); for (Movie m : inMovies) { for (Track t : m.getTracks()) { if (t.getHandler().equals("soun")) { audioTracks.add(t); } if (t.getHandler().equals("vide")) { videoTracks.add(t); } } } // 合并到最终的视频文件 Movie outMovie = new Movie(); if (audioTracks.size() > 0) { outMovie.addTrack(new AppendTrack(audioTracks.toArray(new Track[audioTracks.size()]))); } if (videoTracks.size() > 0) { outMovie.addTrack(new AppendTrack(videoTracks.toArray(new Track[videoTracks.size()]))); } Container mp4file = new DefaultMp4Builder().build(outMovie); // 将文件输出 File resultFile = new File(resultPath, "APlanTeacherAnswer.mp4"); if (resultFile.exists() && resultFile.isFile()) { resultFile.delete(); } FileChannel fc = new RandomAccessFile(resultFile, "rw").getChannel(); mp4file.writeContainer(fc); fc.close(); Log.e("HandDrawActivity", "合成完毕"); // 合成完成后把原片段文件删除 for (String filePath : filePaths) { File file = new File(filePath); file.delete(); } result = true; HandDrawActivity.sendVideo(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return result; }
这个就是结束的时候了,该清空的清空,该注销的注销, i是用来判断录没录的,有可能刚进入这个页面都没录过,直接就返回到别的页面了,那就有可能空指针异常,因为有些变量都没初始化,所以用i判断一下,也可以自己写别的方法判端
private void releaseEncorders(int i) { if (mediaProjection != null) { mediaProjection.stop(); } mBufferInfo = null; if (mEncorder != null) { mEncorder.stop(); } mInputSurface = null; if (mMuxer != null && i == 1) { mMuxer.stop(); } if (mediaRecorder != null) { mediaRecorder.stop(); mediaRecorder.reset(); mediaRecorder.release(); } }
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