Android app内截屏监听

1.在 Application onCreate 方法设置 activity 生命周期监听

package com.example.myscreenshot;import android.app.Activity;
import android.app.Application;
import android.os.Bundle;public class MyApp extends Application {private static MyApp sInstance;private Activity activeActivity;//应用中显示的 activitypublic static MyApp getInstance() {return sInstance;}@Overridepublic void onCreate() {super.onCreate();sInstance=this;initActivityLifecycleCallbacks(this);}//全局监听 activity 生命周期private void initActivityLifecycleCallbacks(Application application) {application.registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {@Overridepublic void onActivityCreated(Activity activity, Bundle savedInstanceState) {activeActivity = activity;}@Overridepublic void onActivityStarted(Activity activity) {activeActivity = activity;}@Overridepublic void onActivityResumed(Activity activity) {activeActivity = activity;}@Overridepublic void onActivityPaused(Activity activity) { }@Overridepublic void onActivityStopped(Activity activity) { }@Overridepublic void onActivitySaveInstanceState(Activity activity, Bundle outState) { }@Overridepublic void onActivityDestroyed(Activity activity) { }});}//获取当前显示的activitypublic Activity getActiveActivity() {return activeActivity;}
}

2.在 MainActivity 初始化文件监听

package com.example.myscreenshot;import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;import android.Manifest;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;public class MainActivity extends AppCompatActivity {private static final int REQUEST_PERMISSION_CODE = 100;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSION_CODE);}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {super.onRequestPermissionsResult(requestCode, permissions, grantResults);Log.e("ScreenShotHelper", "onActivityResult=requestCode=" + requestCode);if (requestCode == REQUEST_PERMISSION_CODE) {ScreenShotHelper.getInstance().registerListener(this);}}@Overrideprotected void onDestroy() {super.onDestroy();ScreenShotHelper.getInstance().unregisterListener();}
}

3.监听截屏

package com.example.myscreenshot;import android.Manifest;
import android.app.Activity;
import android.app.Dialog;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.ContentObserver;
import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Handler;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;import androidx.core.app.ActivityCompat;public class ScreenShotHelper {private final String TAG=getClass().getName();private static final String[] KEYWORDS = {"screenshot", "screen_shot", "screen-shot", "screen shot","screencapture", "screen_capture", "screen-capture", "screen capture","screencap", "screen_cap", "screen-cap", "screen cap", "snap", "截屏"};/*** 读取媒体数据库时需要读取的列*/private static final String[] MEDIA_PROJECTIONS = {MediaStore.Images.ImageColumns.DATA,MediaStore.Images.ImageColumns.DATE_TAKEN,MediaStore.Images.ImageColumns.DATE_ADDED,};/*** 内部存储器内容观察者*/private ContentObserver mInternalObserver;/*** 外部存储器内容观察者*/private ContentObserver mExternalObserver;private ContentResolver mResolver;private String lastData;private Handler mHandler;private static class Instance {static ScreenShotHelper mInstance = new ScreenShotHelper();}public static ScreenShotHelper getInstance() {return Instance.mInstance;}/*** 注册监听* @param mainActivity*/public void registerListener(MainActivity mainActivity) {//上下文mHandler = new Handler(mainActivity.getMainLooper());// 初始化mInternalObserver = new MediaContentObserver(MediaStore.Images.Media.INTERNAL_CONTENT_URI, null);mExternalObserver = new MediaContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null);mResolver = mainActivity.getContentResolver();// 添加监听mResolver.registerContentObserver(MediaStore.Images.Media.INTERNAL_CONTENT_URI, true, mInternalObserver);mResolver.registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, mExternalObserver);}//注销监听public void unregisterListener() {if (mResolver != null) {mResolver.unregisterContentObserver(mInternalObserver);mResolver.unregisterContentObserver(mExternalObserver);}}private void handleMediaContentChange(Uri contentUri) {Cursor cursor = null;try {// 数据改变时查询数据库中最后加入的一条数据cursor = mResolver.query(contentUri,MEDIA_PROJECTIONS,null,null,MediaStore.Images.ImageColumns.DATE_ADDED + " desc limit 1");if (cursor == null) {return;}if (!cursor.moveToFirst()) {return;}// 获取各列的索引int dataIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);int dateTakenIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATE_TAKEN);int dateAddIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATE_ADDED);// 获取行数据final String data = cursor.getString(dataIndex);long dateTaken = cursor.getLong(dateTakenIndex);long dateAdded = cursor.getLong(dateAddIndex);if (data.length() > 0) {if (TextUtils.equals(lastData, data)) {//更改资源文件名也会触发，并且传递过来的是之前的截屏文件，所以只对分钟以内的有效if (System.currentTimeMillis() - dateTaken < 3 * 3600) {mHandler.removeCallbacks(shotCallBack);mHandler.postDelayed(shotCallBack, 500);}} else if (dateTaken == 0 || dateTaken == dateAdded * 1000) {mHandler.removeCallbacks(shotCallBack);} else if (checkScreenShot(data)) {mHandler.removeCallbacks(shotCallBack);lastData = data;mHandler.postDelayed(shotCallBack, 500);}}} catch (Exception e) {Log.e(TAG, "ex==" + e.getMessage());} finally {if (cursor != null && !cursor.isClosed()) {cursor.close();}}}private Runnable shotCallBack = new Runnable() {@Overridepublic void run() {final String path = lastData;if (path != null && path.length() > 0) {Log.e(TAG, "run=path==" + path);//逻辑处理区Dialog dialog=new Dialog(MyApp.getInstance().getActiveActivity());ImageView imageView = new ImageView(MyApp.getInstance().getActiveActivity());imageView.setImageBitmap(BitmapFactory.decodeFile(path));dialog.setContentView(imageView);dialog.show();}}};/*** 根据包含关键字判断是否是截屏*/private boolean checkScreenShot(String data) {if (data == null || data.length() < 2) {return false;}data = data.toLowerCase();for (String keyWork : KEYWORDS) {if (data.contains(keyWork)) {return true;}}return false;}private class MediaContentObserver extends ContentObserver {private Uri mContentUri;private long mLastTime;MediaContentObserver(Uri contentUri, Handler handler) {super(handler);mContentUri = contentUri;}@Overridepublic void onChange(boolean selfChange) {super.onChange(selfChange);try {//满足以下条件才去查询：1.应用是否可见 2.读写权限 是否已开启 3.是否回调多次(某些机型会出现)boolean isVisible = MyApp.getInstance().getActiveActivity() != null && MyApp.getInstance().getActiveActivity().getWindow().getDecorView().getVisibility() == View.VISIBLE;//应用是否可见boolean isGranted = isGrantedPermission(MyApp.getInstance().getActiveActivity());//读写权限 是否已开启boolean isFast = (System.currentTimeMillis() - mLastTime) > 3000;//是否回调多次(某些机型会出现)Log.e(TAG, "onChange==" + selfChange + ",activeActivity=" + MyApp.getInstance().getActiveActivity().getClass().getName() + ",isVisible=" + isVisible + ",isGranted=" + isGranted + ",isFast=" + isFast);if (isVisible && isGranted && isFast) {handleMediaContentChange(mContentUri);mLastTime = System.currentTimeMillis();}} catch (Exception e) {Log.e(TAG, "ex==" + e.getMessage());}}}private boolean isGrantedPermission(Activity activity){return ActivityCompat.checkSelfPermission(activity, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;}
}

4. AndroidManifest.xml 文件设置读写权限

BitmapFactory.decodeFile(path) 高版本需要此项：android:requestLegacyExternalStorage="true"

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.myscreenshot"><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/><applicationandroid:requestLegacyExternalStorage="true"android:name=".MyApp"android:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/AppTheme"><activity android:name=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

Demo 下载地址：https://download.csdn.net/download/qq_29364417/21641402

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