[Android] 取得使用者前景APP

UsageStatsManager是在5.0之后google提供给我们的一个新的API。需要询问是否用户允许了该权限。

  1. 首先添加manifest权限
<uses-permission android:name="android.permission.PACKAGE_USAGE_STATS" 
tools:ignore="ProtectedPermissions" />

  1. 判断是否开启了权限
 @SuppressLint("NewApi")
    public static  boolean hasEnable(Context context){
        if(android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){   // 如果大于等于5.0 再做判断
            long ts = System.currentTimeMillis();
            UsageStatsManager usageStatsManager=(UsageStatsManager)context.getSystemService(Service.USAGE_STATS_SERVICE);
            List<UsageStats> queryUsageStats = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, 0, ts);
            if (queryUsageStats == null || queryUsageStats.isEmpty()) {
                return false;
            }
        }
        return true;
    }
if (!isAccessGranted()) {
    Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS);
    startActivity(intent);
}
private boolean isAccessGranted() {
    try {
        PackageManager packageManager = getPackageManager();
        android.content.pm.ApplicationInfo applicationInfo = packageManager.getApplicationInfo(getPackageName(), 0);
        AppOpsManager appOpsManager = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);
        int mode = 0;
        if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.KITKAT) {
            mode = appOpsManager.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS,
                                                applicationInfo.uid, applicationInfo.packageName);
        }
        return (mode == AppOpsManager.MODE_ALLOWED);

    } catch (PackageManager.NameNotFoundException e) {
        return false;
    }
}

主程式:

private String printForegroundTask() {
    String currentApp = "NULL";
    if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        UsageStatsManager usm = (UsageStatsManager)this.getSystemService("usagestats");
        long time = System.currentTimeMillis();
        List<UsageStats> appList = usm.queryUsageStats(UsageStatsManager.INTERVAL_DAILY,  time - 1000*1000, time);
        if (appList != null && appList.size() > 0) {
            SortedMap<Long, UsageStats> mySortedMap = new TreeMap<Long, UsageStats>();
            for (UsageStats usageStats : appList) {
                mySortedMap.put(usageStats.getLastTimeUsed(), usageStats);
            }
            if (mySortedMap != null && !mySortedMap.isEmpty()) {
                currentApp = mySortedMap.get(mySortedMap.lastKey()).getPackageName();
            }
        }
    } else {
        ActivityManager am = (ActivityManager)this.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> tasks = am.getRunningAppProcesses();
        currentApp = tasks.get(0).processName;
    }

    Log.e("adapter", "Current App in foreground is: " + currentApp);
    return currentApp;
}

 

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