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Android监听针对app的截屏然后加二维码

<Excerpt in index | 首页摘要>

监听用户对当前的app进行截图
然后处理用户的截图

<The rest of contents | 余下全文>

写在前面

我们产品在需求上增加了个内容。

监听用户对app的截图,并在截图的底部加入二维码,展示给用户 询问他是否进行分享,并且提供分享操作。

监听截图比较靠谱的方式有两种:

1.监听截图按键(比如音量键+关机键)

2.监听媒体库

第一种需要适配N种情况,所以我最后选择的第二种。

具体实现

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package com.miaozan.xpro.manager;

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.Matrix;
import android.graphics.Paint;
import android.graphics.Point;
import android.net.Uri;
import android.os.Build;
import android.os.Handler;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;

import com.gloomyer.threadppl.ThreadPool;
import com.miaozan.xpro.R;
import com.miaozan.xpro.base.BaseApp;
import com.miaozan.xpro.ui.screenshot.ScreenShotShowActivity;
import com.miaozan.xpro.utils.AppUtils;
import com.miaozan.xpro.utils.DensityUtil;


import java.io.File;
import java.io.FileOutputStream;
import java.lang.reflect.Method;

/**
* Description: 截图监听管理者
* Author: gloomy
* Version: 1.0
* Create Date Time: 18-3-1 下午1:43.
* Update Date Time:
*
* @see
*/

public class ScreenShotListenManager {
public static final String TAG = ScreenShotListenManager.class.getSimpleName();

private enum Singleton {
INSTANCE;

private ScreenShotListenManager singleton;

Singleton() {
singleton = new ScreenShotListenManager();
}

public ScreenShotListenManager getInstance() {
return singleton;
}
}

public static ScreenShotListenManager get() {
return Singleton.INSTANCE.getInstance();
}

/**
* 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,
};
/**
* 读取媒体数据库时需要读取的列
*/
private static final String[] MEDIA_PROJECTIONS_API_16 = {
MediaStore.Images.ImageColumns.DATA,
MediaStore.Images.ImageColumns.DATE_TAKEN,
MediaStore.Images.ImageColumns.WIDTH,
MediaStore.Images.ImageColumns.HEIGHT,
};

/**
* 是否属于截图的关键字判断
*/
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"
};

private Context mContext;
private Handler mHandler;
private Point mScreenRealSize;


private ScreenShotListenManager() {
mContext = BaseApp.getAppContext();//application context 自己想办法从自己项目中获取 也可以从外部调用传递
mHandler = new Handler(BaseApp.getAppContext().getMainLooper());

// 获取屏幕真实的分辨率
if (mScreenRealSize == null) {
mScreenRealSize = getRealScreenSize();
}
}

/**
* 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;


/**
* 启动监听
*/
public void startListen() {
// 创建内容观察者
mInternalObserver = new MediaContentObserver(MediaStore.Images.Media.INTERNAL_CONTENT_URI, mHandler);
mExternalObserver = new MediaContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, mHandler);

// 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
);
}


/**
* 获取屏幕真实分辨率
*/
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;
}

/**
* 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_ADDED + " 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();
}
}
}

/**
* 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) {

/*
* 1:根据图片的尺寸判断
*/
if (mScreenRealSize != null) {
// 如果图片尺寸超出屏幕, 则认为当前没有截屏
if (!((width <= mScreenRealSize.x && height <= mScreenRealSize.y)
||
(height <= mScreenRealSize.x && width <= mScreenRealSize.y))) {
return false;
}
}

/*
* 2:根据路径判断
*/
if (TextUtils.isEmpty(data)) {
return false;
}

/**
* 3:根据关键字判断
*/
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)) {
/**
* 4:根据app的可视情况判断
* 这个说明一下 ActivityManager 是我自己管理的 类似的东西百度一下就好 我这里就不上传ActivityManager的代码了。就是在baseactivity生命周期中加入的监听
*/
if (ActivityManager.getInstance().appIsResume()) {//当前app处于可视状态
return true;
}
return false;
}
}
return false;
}


/**
* 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);
handlerShotImg(data, width, height);
} 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);
}
}

/**
* 截屏的图片 处理
*
* @param data
* @param width
* @param height
*/
private void handlerShotImg(String data, int width, int height) {
//ThreadPool.getInstance().execute 替换为开一个新线程即可
ThreadPool.getInstance().execute(8, () -> {
int topHeight = height;
if (AppUtils.hasNavigationBar() && AppUtils.isNavigationBarShow()) {
//有虚拟键 并且虚拟键在显示
topHeight -= AppUtils.getNavigationBarHeight();
}
int padding = DensityUtil.dip2px(15);
//处理图片
//缩放图片至和屏幕宽度一致
Bitmap watermarkBitmap = BitmapFactory.decodeResource(mContext.getResources(), R.mipmap.xpro_ic_snap_logo);
Bitmap sourceBitmap = BitmapFactory.decodeFile(data);
float scale = (width - padding * 2.0f) / watermarkBitmap.getWidth();
int bottomHeight = (int) (watermarkBitmap.getHeight() * scale);
int totalHeight = topHeight + bottomHeight + padding * 2;
Bitmap bitmap = Bitmap.createBitmap(width, totalHeight, Bitmap.Config.ARGB_8888);

Canvas canvas = new Canvas(bitmap);
Paint whitePaint = new Paint();
whitePaint.setColor(Color.WHITE);

canvas.drawBitmap(sourceBitmap, 0, 0, null);
canvas.drawRect(0, topHeight, width, totalHeight, whitePaint);
Matrix matrix = new Matrix();
matrix.postScale(scale, scale);
matrix.postTranslate(padding, padding + topHeight);
canvas.drawBitmap(watermarkBitmap, matrix, null);
// 保存
canvas.save(Canvas.ALL_SAVE_FLAG);
// 存储
canvas.restore();
FileOutputStream fos;
try {
File file = new File(CacheFileManager.get().getFile("screenHot"), System.currentTimeMillis() + ".jpg");
fos = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
mHandler.post(() -> {
AppUtils.startActivity(ActivityManager.getInstance().getTopActivity(),
ScreenShotShowActivity.class, "data", file.getAbsolutePath());
});
} catch (Exception e) {
e.printStackTrace();
}
});
}

/**
* 获取图片尺寸
*
* @param imagePath
* @return
*/
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);
}


/**
* 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;
}

@Override
public void onChange(boolean selfChange) {
super.onChange(selfChange);
handleMediaContentChange(mContentUri);
}
}

}