Android开发实现录屏小功能
最近开发中，要实现录屏功能，查阅相关资料，发现调用MediaProjectionManager的api实现录屏功能即可：
importandroid.Manifest;
importandroid.app.Activity;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.content.pm.PackageManager;
importandroid.media.projection.MediaProjectionManager;
importandroid.os.Build;
importandroid.os.Bundle;
importandroid.util.DisplayMetrics;
importandroid.util.Log;
publicclassRecordScreenActivityextendsActivity{
privatebooleanisRecord=false;
privateintmScreenWidth;
privateintmScreenHeight;
privateintmScreenDensity;
privateintREQUEST_CODE_PERMISSION_STORAGE=100;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
requestPermission();
getScreenBaseInfo();
startScreenRecord();
}
@Override
protectedvoidonActivityResult(intrequestCode,intresultCode,Intentdata){
super.onActivityResult(requestCode,resultCode,data);
if(requestCode==1000){
if(resultCode==RESULT_OK){
//获得录屏权限，启动Service进行录制
Intentintent=newIntent(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();
}
}
}
//startscreenrecord
privatevoidstartScreenRecord(){
//ManagestheretrievalofcertaintypesofMediaProjectiontokens.
MediaProjectionManagermediaProjectionManager=
(MediaProjectionManager)getSystemService(Context.MEDIA_PROJECTION_SERVICE);
//ReturnsanIntentthatmustpassedtostartActivityForResult()inordertostartscreencapture.
IntentpermissionIntent=mediaProjectionManager.createScreenCaptureIntent();
startActivityForResult(permissionIntent,1000);
}
/**
*获取屏幕基本信息
*/
privatevoidgetScreenBaseInfo(){
//Astructuredescribinggeneralinformationaboutadisplay,suchasitssize,density,andfontscaling.
DisplayMetricsmetrics=newDisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
mScreenWidth=metrics.widthPixels;
mScreenHeight=metrics.heightPixels;
mScreenDensity=metrics.densityDpi;
}
@Override
protectedvoidonDestroy(){
super.onDestroy();
}
privatevoidrequestPermission(){
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(Stringstr:permissions){
if(this.checkSelfPermission(str)!=PackageManager.PERMISSION_GRANTED){
this.requestPermissions(permissions,REQUEST_CODE_PERMISSION_STORAGE);
return;
}
}
}
}
@Override
publicvoidonRequestPermissionsResult(intrequestCode,String[]permissions,int[]grantResults){
super.onRequestPermissionsResult(requestCode,permissions,grantResults);
if(requestCode==REQUEST_CODE_PERMISSION_STORAGE){
startScreenRecord();
}
}
}
service里面进行相关录制工作
importandroid.app.Service;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.hardware.display.DisplayManager;
importandroid.hardware.display.VirtualDisplay;
importandroid.media.MediaRecorder;
importandroid.media.projection.MediaProjection;
importandroid.media.projection.MediaProjectionManager;
importandroid.os.Environment;
importandroid.os.IBinder;
importandroid.support.annotation.Nullable;
importandroid.util.Log;
importjava.text.SimpleDateFormat;
importjava.util.Date;
/**
*Createdbydzjinon2018/1/9.
*/
publicclassScreenRecordServiceextendsService{
privateintresultCode;
privateIntentresultData=null;
privateMediaProjectionmediaProjection=null;
privateMediaRecordermediaRecorder=null;
privateVirtualDisplayvirtualDisplay=null;
privateintmScreenWidth;
privateintmScreenHeight;
privateintmScreenDensity;
privateContextcontext=null;
@Override
publicvoidonCreate(){
super.onCreate();
}
/**
*CalledbythesystemeverytimeaclientexplicitlystartstheservicebycallingstartService(Intent),
*providingtheargumentsitsuppliedandauniqueintegertokenrepresentingthestartrequest.
*Donotcallthismethoddirectly.
*@paramintent
*@paramflags
*@paramstartId
*@return
*/
@Override
publicintonStartCommand(Intentintent,intflags,intstartId){
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(Exceptione){
e.printStackTrace();
}
/**
*START_NOT_STICKY:
*ConstanttoreturnfromonStartCommand(Intent,int,int):ifthisservice'sprocessis
*killedwhileitisstarted(afterreturningfromonStartCommand(Intent,int,int)),
*andtherearenonewstartintentstodelivertoit,thentaketheserviceoutofthe
*startedstateanddon'trecreateuntilafutureexplicitcalltoContext.startService(Intent).
*TheservicewillnotreceiveaonStartCommand(Intent,int,int)callwithanullIntent
*becauseitwillnotbere-startediftherearenopendingIntentstodeliver.
*/
returnService.START_NOT_STICKY;
}
//createMediaProjection
publicMediaProjectioncreateMediaProjection(){
/**
*UsewithgetSystemService(Class)toretrieveaMediaProjectionManagerinstancefor
*managingmediaprojectionsessions.
*/
return((MediaProjectionManager)getSystemService(Context.MEDIA_PROJECTION_SERVICE))
.getMediaProjection(resultCode,resultData);
/**
*RetrievetheMediaProjectionobtainedfromasuccesfulscreencapturerequest.
*WillbenulliftheresultfromthestartActivityForResult()isanythingotherthanRESULT_OK.
*/
}
privateMediaRecordercreateMediaRecorder(){
SimpleDateFormatsimpleDateFormat=newSimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
StringfilePathName=Environment.getExternalStorageDirectory()+"/"+simpleDateFormat.format(newDate())+".mp4";
//Usedtorecordaudioandvideo.Therecordingcontrolisbasedonasimplestatemachine.
MediaRecordermediaRecorder=newMediaRecorder();
//Setthevideosourcetobeusedforrecording.
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
//Settheformatoftheoutputproducedduringrecording.
//3GPPmediafileformat
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
//Setsthevideoencodingbitrateforrecording.
//param:thevideoencodingbitrateinbitspersecond.
mediaRecorder.setVideoEncodingBitRate(5*mScreenWidth*mScreenHeight);
//Setsthevideoencodertobeusedforrecording.
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
//Setsthewidthandheightofthevideotobecaptured.
mediaRecorder.setVideoSize(mScreenWidth,mScreenHeight);
//Setstheframerateofthevideotobecaptured.
mediaRecorder.setVideoFrameRate(60);
try{
//Passinthefileobjecttobewritten.
mediaRecorder.setOutputFile(filePathName);
//Preparestherecordertobegincapturingandencodingdata.
mediaRecorder.prepare();
}catch(Exceptione){
e.printStackTrace();
}
returnmediaRecorder;
}
privateVirtualDisplaycreateVirtualDisplay(){
/**
*nameString:Thenameofthevirtualdisplay,mustbenon-empty.Thisvaluemustneverbenull.
widthint:Thewidthofthevirtualdisplayinpixels.Mustbegreaterthan0.
heightint:Theheightofthevirtualdisplayinpixels.Mustbegreaterthan0.
dpiint:Thedensityofthevirtualdisplayindpi.Mustbegreaterthan0.
flagsint:Acombinationofvirtualdisplayflags.SeeDisplayManagerforthefulllistofflags.
surfaceSurface:Thesurfacetowhichthecontentofthevirtualdisplayshouldberendered,ornullifthereisnoneinitially.
callbackVirtualDisplay.Callback:Callbacktocallwhenthevirtualdisplay'sstatechanges,ornullifnone.
handlerHandler:TheHandleronwhichthecallbackshouldbeinvoked,ornullifthecallbackshouldbeinvokedonthecallingthread'smainLooper.
*/
/**
*DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR
*Virtualdisplayflag:Allowscontenttobemirroredonprivatedisplayswhennocontentisbeingshown.
*/
returnmediaProjection.createVirtualDisplay("mediaProjection",mScreenWidth,mScreenHeight,mScreenDensity,
DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,mediaRecorder.getSurface(),null,null);
}
@Override
publicvoidonDestroy(){
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
publicIBinderonBind(Intentintent){
returnnull;
}
}
录屏功能就这么实现了，有什么不妥之处，敬请留言讨论。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。