最近開發(fā)中，要實(shí)現(xiàn)錄屏功能，查閱相關(guān)資料，發(fā)現(xiàn)調(diào)用 MediaProjectionManager的api 實(shí)現(xiàn)錄屏功能即可：

import android.Manifest;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.pm.PackageManager;import android.media.projection.MediaProjectionManager;import android.os.Build;import android.os.Bundle;import android.util.DisplayMetrics;import android.util.Log;public class RecordScreenActivity extends Activity { private boolean isRecord = false; private int mScreenWidth; private int mScreenHeight; private int mScreenDensity; private int REQUEST_CODE_PERMISSION_STORAGE = 100; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestPermission(); getScreenBaseInfo(); startScreenRecord(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == 1000) { if (resultCode == RESULT_OK) {//獲得錄屏權(quán)限，啟動Service進(jìn)行錄制Intent intent = new Intent(this, ScreenRecordService.class);intent.putExtra('resultCode', resultCode);intent.putExtra('resultData', data);intent.putExtra('mScreenWidth', mScreenWidth);intent.putExtra('mScreenHeight', mScreenHeight);intent.putExtra('mScreenDensity', mScreenDensity);startService(intent);finish(); } } } //start screen record private void startScreenRecord() { //Manages the retrieval of certain types of MediaProjection tokens. MediaProjectionManager mediaProjectionManager =(MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE); //Returns an Intent that must passed to startActivityForResult() in order to start screen capture. Intent permissionIntent = mediaProjectionManager.createScreenCaptureIntent(); startActivityForResult(permissionIntent, 1000); } /** * 獲取屏幕基本信息 */ private void getScreenBaseInfo() { //A structure describing general information about a display, such as its size, density, and font scaling. DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); mScreenWidth = metrics.widthPixels; mScreenHeight = metrics.heightPixels; mScreenDensity = metrics.densityDpi; } @Override protected void onDestroy() { super.onDestroy(); } private void requestPermission() { if (Build.VERSION.SDK_INT >= 23) { String[] permissions = { Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO, Manifest.permission.CAMERA }; for (String str : permissions) {if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) { this.requestPermissions(permissions, REQUEST_CODE_PERMISSION_STORAGE); return;} } } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions,int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if(requestCode==REQUEST_CODE_PERMISSION_STORAGE){ startScreenRecord(); } }}

service 里面進(jìn)行相關(guān)錄制工作

import android.app.Service;import android.content.Context;import android.content.Intent;import android.hardware.display.DisplayManager;import android.hardware.display.VirtualDisplay;import android.media.MediaRecorder;import android.media.projection.MediaProjection;import android.media.projection.MediaProjectionManager;import android.os.Environment;import android.os.IBinder;import android.support.annotation.Nullable;import android.util.Log;import java.text.SimpleDateFormat;import java.util.Date;/** * Created by dzjin on 2018/1/9. */ public class ScreenRecordService extends Service { private int resultCode; private Intent resultData=null; private MediaProjection mediaProjection=null; private MediaRecorder mediaRecorder=null; private VirtualDisplay virtualDisplay=null; private int mScreenWidth; private int mScreenHeight; private int mScreenDensity; private Context context=null; @Override public void onCreate() { super.onCreate(); } /** * Called by the system every time a client explicitly starts the service by calling startService(Intent), * providing the arguments it supplied and a unique integer token representing the start request. * Do not call this method directly. * @param intent * @param flags * @param startId * @return */ @Override public int onStartCommand(Intent intent, int flags, int startId) { try{ resultCode=intent.getIntExtra('resultCode',-1); resultData=intent.getParcelableExtra('resultData'); mScreenWidth=intent.getIntExtra('mScreenWidth',0); mScreenHeight=intent.getIntExtra('mScreenHeight',0); mScreenDensity=intent.getIntExtra('mScreenDensity',0); mediaProjection=createMediaProjection(); mediaRecorder=createMediaRecorder(); virtualDisplay=createVirtualDisplay(); mediaRecorder.start(); }catch (Exception e) { e.printStackTrace(); } /** * START_NOT_STICKY: * Constant to return from onStartCommand(Intent, int, int): if this service’s process is * killed while it is started (after returning from onStartCommand(Intent, int, int)), * and there are no new start intents to deliver to it, then take the service out of the * started state and don’t recreate until a future explicit call to Context.startService(Intent). * The service will not receive a onStartCommand(Intent, int, int) call with a null Intent * because it will not be re-started if there are no pending Intents to deliver. */ return Service.START_NOT_STICKY; } //createMediaProjection public MediaProjection createMediaProjection(){ /** * Use with getSystemService(Class) to retrieve a MediaProjectionManager instance for * managing media projection sessions. */ return ((MediaProjectionManager)getSystemService(Context.MEDIA_PROJECTION_SERVICE)).getMediaProjection(resultCode,resultData); /** * Retrieve the MediaProjection obtained from a succesful screen capture request. * Will be null if the result from the startActivityForResult() is anything other than RESULT_OK. */ } private MediaRecorder createMediaRecorder(){ SimpleDateFormat simpleDateFormat=new SimpleDateFormat('yyyy-MM-dd-HH-mm-ss'); String filePathName= Environment.getExternalStorageDirectory()+'/'+simpleDateFormat.format(new Date())+'.mp4'; //Used to record audio and video. The recording control is based on a simple state machine. MediaRecorder mediaRecorder=new MediaRecorder(); //Set the video source to be used for recording. mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE); //Set the format of the output produced during recording. //3GPP media file format mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); //Sets the video encoding bit rate for recording. //param:the video encoding bit rate in bits per second. mediaRecorder.setVideoEncodingBitRate(5*mScreenWidth*mScreenHeight); //Sets the video encoder to be used for recording. mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264); //Sets the width and height of the video to be captured. mediaRecorder.setVideoSize(mScreenWidth,mScreenHeight); //Sets the frame rate of the video to be captured. mediaRecorder.setVideoFrameRate(60); try{ //Pass in the file object to be written. mediaRecorder.setOutputFile(filePathName); //Prepares the recorder to begin capturing and encoding data. mediaRecorder.prepare(); }catch (Exception e){ e.printStackTrace(); } return mediaRecorder; } private VirtualDisplay createVirtualDisplay(){ /** * name String: The name of the virtual display, must be non-empty.This value must never be null. width int: The width of the virtual display in pixels. Must be greater than 0. height int: The height of the virtual display in pixels. Must be greater than 0. dpi int: The density of the virtual display in dpi. Must be greater than 0. flags int: A combination of virtual display flags. See DisplayManager for the full list of flags. surface Surface: The surface to which the content of the virtual display should be rendered, or null if there is none initially. callback VirtualDisplay.Callback: Callback to call when the virtual display’s state changes, or null if none. handler Handler: The Handler on which the callback should be invoked, or null if the callback should be invoked on the calling thread’s main Looper. */ /** * DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR * Virtual display flag: Allows content to be mirrored on private displays when no content is being shown. */ return mediaProjection.createVirtualDisplay('mediaProjection',mScreenWidth,mScreenHeight,mScreenDensity,DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,mediaRecorder.getSurface(),null,null); } @Override public void onDestroy() { super.onDestroy(); if(virtualDisplay!=null){ virtualDisplay.release(); virtualDisplay=null; } if(mediaRecorder!=null){ mediaRecorder.stop(); mediaRecorder=null; } if(mediaProjection!=null){ mediaProjection.stop(); mediaProjection=null; } } @Nullable @Override public IBinder onBind(Intent intent) { return null; }}

錄屏功能就這么實(shí)現(xiàn)了，有什么不妥之處，敬請留言討論。

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