Android开发如何实现录屏小功能

发布时间：2020-07-30 09:20:54

来源：亿速云

阅读：222

作者：小猪

这篇文章主要讲解了Android开发如何实现录屏小功能，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。

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：

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) {

//获得录屏权限，启动Service进行录制

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);

}

/**

* 获取屏幕基本信息

*/

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 里面进行相关录制工作

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;

}

}

录屏功能就这么实现了，有什么不妥之处，敬请留言讨论。

看完上述内容，是不是对Android开发如何实现录屏小功能有进一步的了解，如果还想学习更多内容，欢迎关注亿速云行业资讯频道。