Android App中监听系统截屏(截屏监听功能)

功能需求：
App内截屏监控功能，当发现用户在我们的app内进行了截屏操作时，进行对图片的二次操作，例如添加二维码，公司logo等一系列操作。
首先来app界面图及截屏监听图添加效果图

主要是利用内容观察者（ContentObserver）监听媒体数据库的变化，当数据库有变化时，获取最后插入的一条图片数据，如果该图片符合特定的规则，则认为被截屏了，下面看看截屏管理类

ScreenShotListenManager.java

package com.test.base;import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Point;
import android.net.Uri;
import android.os.Build;
import android.os.Handler;
import android.os.Looper;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;import com.test.R;import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;/*** @CreateDate: 2020/9/17* @Author:lp* @Description:*/
public class ScreenShotListenManager {private static final String TAG = "ScreenShotListenManager";/*** 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};/*** 读取媒体数据库时需要读取的列, 其中 WIDTH 和 HEIGHT 字段在 API 16 以后才有*/private static final String[] MEDIA_PROJECTIONS_API_16 = {MediaStore.Images.ImageColumns.DATA,MediaStore.Images.ImageColumns.DATE_TAKEN,MediaStore.Images.ImageColumns.DATE_ADDED,MediaStore.Images.ImageColumns.WIDTH,MediaStore.Images.ImageColumns.HEIGHT,};/*** 截屏依据中的路径判断关键字*/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", "Screenshots", "Screenshot"};private static Point sScreenRealSize;/*** 已回调过的路径*/private final static List<String> sHasCallbackPaths = new ArrayList<String>();private Context mContext;private OnScreenShotListener mListener;private long mStartListenTime;/*** 内部存储器内容观察者*/private MediaContentObserver mInternalObserver;/*** 外部存储器内容观察者*/private MediaContentObserver mExternalObserver;/*** 运行在 UI 线程的 Handler, 用于运行监听器回调*/private final Handler mUiHandler = new Handler(Looper.getMainLooper());private ScreenShotListenManager(Context context) {if (context == null) {throw new IllegalArgumentException("The context must not be null.");}mContext = context;// 获取屏幕真实的分辨率if (sScreenRealSize == null) {sScreenRealSize = getRealScreenSize();if (sScreenRealSize != null) {Log.d(TAG, "Screen Real Size: " + sScreenRealSize.x + " * " + sScreenRealSize.y);} else {Log.w(TAG, "Get screen real size failed.");}}}public static ScreenShotListenManager newInstance(Context context) {assertInMainThread();return new ScreenShotListenManager(context);}/*** 启动监听*/public void startListen() {assertInMainThread();//        sHasCallbackPaths.clear();// 记录开始监听的时间戳mStartListenTime = System.currentTimeMillis();// 创建内容观察者mInternalObserver = new MediaContentObserver(MediaStore.Images.Media.INTERNAL_CONTENT_URI, mUiHandler);mExternalObserver = new MediaContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, mUiHandler);//Android Q(10) ContentObserver 不回调 onChangeif (Build.VERSION.SDK_INT > Build.VERSION_CODES.P) {// 注册内容观察者mContext.getContentResolver().registerContentObserver(MediaStore.Images.Media.INTERNAL_CONTENT_URI,true,mInternalObserver);mContext.getContentResolver().registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,true,mExternalObserver);} else {// 注册内容观察者mContext.getContentResolver().registerContentObserver(MediaStore.Images.Media.INTERNAL_CONTENT_URI,false,mInternalObserver);mContext.getContentResolver().registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,false,mExternalObserver);}}/*** 停止监听*/public void stopListen() {assertInMainThread();// 注销内容观察者if (mInternalObserver != null) {try {mContext.getContentResolver().unregisterContentObserver(mInternalObserver);} catch (Exception e) {e.printStackTrace();}mInternalObserver = null;}if (mExternalObserver != null) {try {mContext.getContentResolver().unregisterContentObserver(mExternalObserver);} catch (Exception e) {e.printStackTrace();}mExternalObserver = null;}// 清空数据mStartListenTime = 0;
//        sHasCallbackPaths.clear();//切记！！！:必须设置为空 可能mListener 会隐式持有Activity导致释放不掉mListener = null;}/*** 处理媒体数据库的内容改变*/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 = mContext.getContentResolver().query(contentUri,Build.VERSION.SDK_INT < 16 ? MEDIA_PROJECTIONS : MEDIA_PROJECTIONS_API_16,null,null,MediaStore.Images.ImageColumns.DATE_MODIFIED + " desc limit 1");if (cursor == null) {Log.e(TAG, "Deviant logic.");return;}if (!cursor.moveToFirst()) {Log.d(TAG, "Cursor no data.");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 widthIndex = -1;int heightIndex = -1;if (Build.VERSION.SDK_INT >= 16) {widthIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns.WIDTH);heightIndex = cursor.getColumnIndex(MediaStore.Images.ImageColumns.HEIGHT);}// 获取行数据String data = cursor.getString(dataIndex);long dateTaken = cursor.getLong(dateTakenIndex);int width = 0;int height = 0;if (widthIndex >= 0 && heightIndex >= 0) {width = cursor.getInt(widthIndex);height = cursor.getInt(heightIndex);} else {// API 16 之前, 宽高要手动获取Point size = getImageSize(data);width = size.x;height = size.y;}// 处理获取到的第一行数据handleMediaRowData(data, dateTaken, width, height);} catch (Exception e) {e.printStackTrace();} finally {if (cursor != null && !cursor.isClosed()) {cursor.close();}}}private Point getImageSize(String imagePath) {BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;BitmapFactory.decodeFile(imagePath, options);return new Point(options.outWidth, options.outHeight);}/*** 处理获取到的一行数据*/private void handleMediaRowData(String data, long dateTaken, int width, int height) {if (checkScreenShot(data, dateTaken, width, height)) {Log.d(TAG, "ScreenShot: path = " + data + "; size = " + width + " * " + height+ "; date = " + dateTaken);if (mListener != null && !checkCallback(data)) {mListener.onShot(data);}} else {// 如果在观察区间媒体数据库有数据改变，又不符合截屏规则，则输出到 log 待分析Log.w(TAG, "Media content changed, but not screenshot: path = " + data+ "; size = " + width + " * " + height + "; date = " + dateTaken);}}/*** 判断指定的数据行是否符合截屏条件*/private boolean checkScreenShot(String data, long dateTaken, int width, int height) {/** 判断依据一: 时间判断*/// 如果加入数据库的时间在开始监听之前, 或者与当前时间相差大于10秒, 则认为当前没有截屏if (dateTaken < mStartListenTime || (System.currentTimeMillis() - dateTaken) > 10 * 1000) {return false;}/** 判断依据二: 尺寸判断*/if (sScreenRealSize != null) {// 如果图片尺寸超出屏幕, 则认为当前没有截屏if (!((width <= sScreenRealSize.x && height <= sScreenRealSize.y)|| (height <= sScreenRealSize.x && width <= sScreenRealSize.y))) {return false;}}/** 判断依据三: 路径判断*/if (TextUtils.isEmpty(data)) {return false;}data = data.toLowerCase();// 判断图片路径是否含有指定的关键字之一, 如果有, 则认为当前截屏了for (String keyWork : KEYWORDS) {if (data.contains(keyWork)) {return true;}}return false;}/*** 判断是否已回调过, 某些手机ROM截屏一次会发出多次内容改变的通知; <br/>* 删除一个图片也会发通知, 同时防止删除图片时误将上一张符合截屏规则的图片当做是当前截屏.*/private boolean checkCallback(String imagePath) {if (sHasCallbackPaths.contains(imagePath)) {Log.d(TAG, "ScreenShot: imgPath has done"+ "; imagePath = " + imagePath);return true;}// 大概缓存15~20条记录便可if (sHasCallbackPaths.size() >= 20) {for (int i = 0; i < 5; i++) {sHasCallbackPaths.remove(0);}}sHasCallbackPaths.add(imagePath);return false;}/*** 获取屏幕分辨率*/private Point getRealScreenSize() {Point screenSize = null;try {screenSize = new Point();WindowManager windowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);Display defaultDisplay = windowManager.getDefaultDisplay();if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {defaultDisplay.getRealSize(screenSize);} else {try {Method mGetRawW = Display.class.getMethod("getRawWidth");Method mGetRawH = Display.class.getMethod("getRawHeight");screenSize.set((Integer) mGetRawW.invoke(defaultDisplay),(Integer) mGetRawH.invoke(defaultDisplay));} catch (Exception e) {screenSize.set(defaultDisplay.getWidth(), defaultDisplay.getHeight());e.printStackTrace();}}} catch (Exception e) {e.printStackTrace();}return screenSize;}/*** 获取截屏并进行二次处理** @param context* @param screenFilePath* @return*/public Bitmap createScreenShotBitmap(Context context, String screenFilePath) {View v = LayoutInflater.from(context).inflate(R.layout.screen_view_layout, null);ImageView iv = (ImageView) v.findViewById(R.id.svl_pic);Bitmap bitmap = BitmapFactory.decodeFile(screenFilePath);iv.setImageBitmap(bitmap);//整体布局Point point = getRealScreenSize();v.measure(View.MeasureSpec.makeMeasureSpec(point.x, View.MeasureSpec.EXACTLY),View.MeasureSpec.makeMeasureSpec(point.y, View.MeasureSpec.EXACTLY));v.layout(0, 0, point.x, point.y);//增加的高度120是二次编辑增加的高度（二维码及文本的高度）Bitmap result = Bitmap.createBitmap(v.getWidth(), v.getHeight() + dp2px(context, 120), Bitmap.Config.ARGB_8888);Canvas c = new Canvas(result);c.drawColor(Color.WHITE);// Draw view to canvasv.draw(c);return result;}private int dp2px(Context ctx, float dp) {float scale = ctx.getResources().getDisplayMetrics().density;return (int) (dp * scale + 0.5f);}/*** 设置截屏监听器*/public void setListener(OnScreenShotListener listener) {mListener = listener;}public interface OnScreenShotListener {void onShot(String imagePath);}private static void assertInMainThread() {if (Looper.myLooper() != Looper.getMainLooper()) {StackTraceElement[] elements = Thread.currentThread().getStackTrace();String methodMsg = null;if (elements != null && elements.length >= 4) {methodMsg = elements[3].toString();}throw new IllegalStateException("Call the method must be in main thread: " + methodMsg);}}/*** 媒体内容观察者(观察媒体数据库的改变)*/private class MediaContentObserver extends ContentObserver {private Uri mContentUri;public MediaContentObserver(Uri contentUri, Handler handler) {super(handler);mContentUri = contentUri;}@Overridepublic void onChange(boolean selfChange) {super.onChange(selfChange);handleMediaContentChange(mContentUri);}}}

里面用到的screen_view_layout布局文件是自定义的二次编辑图片布局

screen_view_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/svl_root"android:layout_width="match_parent"android:layout_height="match_parent"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><ImageViewandroid:id="@+id/svl_pic"android:layout_width="match_parent"android:layout_height="match_parent" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="@dimen/dp_120"android:gravity="center"android:orientation="horizontal"><ImageViewandroid:layout_width="@dimen/dp_80"android:layout_height="@dimen/dp_80"android:src="@mipmap/qr_code_icon" /><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="@dimen/dp_35"android:gravity="center"android:text="二维码"android:textColor="@color/color_132644"android:textSize="@dimen/sp_28" /></LinearLayout></LinearLayout>
</ScrollView>

到这里基本就已经完成了，下面看看如果使用，如果是单个页面就在那个Activity中添加监听就行，如果是整个app都要用就放在BaseActivity中方法不变在onResume开始监听，onPause取消监听

@Overrideprotected void onResume() {super.onResume();startScreenShotListen();}@Overrideprotected void onPause() {super.onPause();stopScreenShotListen();}private ScreenShotListenManager screenShotListenManager;private boolean isHasScreenShotListener = false;/*** 监听*/private void startScreenShotListen() {if (!isHasScreenShotListener && screenShotListenManager != null) {screenShotListenManager.setListener(new ScreenShotListenManager.OnScreenShotListener() {@Overridepublic void onShot(String imagePath) {//得到二次编辑的图片screenShotListenManager.createScreenShotBitmap(BaseActivity.this,imagePath)}});screenShotListenManager.startListen();isHasScreenShotListener = true;}}/*** 停止监听*/public void stopScreenShotListen() {if (isHasScreenShotListener && screenShotListenManager != null) {screenShotListenManager.stopListen();isHasScreenShotListener = false;}}

到这里就结束啦，加油骚年

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