Android判斷當前界面是否是桌面

添加權限：

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> <!-- 使用SYSTEM_ALERT_WINDOW時必須要加 -->
<uses-permission android:name="android.permission.GET_TASKS"/>

/**
     * 判斷當前界面是否是桌面
     */
    private boolean isHome() {
        ActivityManager mActivityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> rti = mActivityManager.getRunningTasks(1);
        return getHomes().contains(rti.get(0).topActivity.getPackageName());
    }
    /**
     * 獲得屬於桌面的應用的應用包名稱
     * 
     * @return 返回包含所有包名的字符串列表
     */
    private List<String> getHomes() {
        List<String> names = new ArrayList<String>();
        PackageManager packageManager = this.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_HOME);
        List<ResolveInfo> resolveInfo = packageManager.queryIntentActivities(intent,
                PackageManager.MATCH_DEFAULT_ONLY);
        for (ResolveInfo ri : resolveInfo) {
            names.add(ri.activityInfo.packageName);
        }
        return names;
    }