获取已安装的APP

    /**
     * 获取所有非系统应用
     * 可以把代码中的判断去掉,获取所有的APP
     */
    private void getAllApps() {
        SLog.Console("获取所有非系统应用");
        String result = "";
        PackageManager pManager = context.getPackageManager();
        //获取手机内所有应用
        List<PackageInfo> paklist = pManager.getInstalledPackages(0);
        for (int i = 0; i < paklist.size(); i++) {
            PackageInfo pak = (PackageInfo) paklist.get(i);
            //判断是否为非系统预装的应用程序
            if ((pak.applicationInfo.flags & pak.applicationInfo.FLAG_SYSTEM) <= 0) {
                // customs applications
                if (TextUtils.isEmpty(result)) {
                    result = pak.applicationInfo.loadLabel(pManager).toString();
                } else {
                    result = result + "," + pak.applicationInfo.loadLabel(pManager).toString();
                }
            }
        }
        SLog.Console("设备安装非系统应用信息:" + result);
    }

获取正在显示的APP

public void getCurrentDisplayAPPInfo() {
        SLog.Console("当前界面显示");
        try {
            ActivityManager mActivityManager = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
            List<ActivityManager.RunningAppProcessInfo> list = mActivityManager.getRunningAppProcesses();
            String mPackageName = "";
            if (Build.VERSION.SDK_INT > 20) {
                mPackageName = getTopActivty();
            } else {
                mPackageName = mActivityManager.getRunningTasks(1).get(0).topActivity.getPackageName();
            }
            if (!TextUtils.isEmpty(mPackageName)) {
                SLog.Console("当前界面显示的App:" + mPackageName);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }