碼字辛苦！轉(zhuǎn)載請(qǐng)注明出處！

· 錯(cuò)誤的方法：

public static List<PackageInfo> getAllApplication(Context context, boolean needActivities) {
        PackageManager packageManager = context.getPackageManager();
        return packageManager.getInstalledPackages(needActivities ? PackageManager.GET_ACTIVITIES : 0);
    }

這是目前網(wǎng)上最流行，也是看上去語義最貼合實(shí)際的方法，然而，經(jīng)過博主項(xiàng)目的大量測試，發(fā)現(xiàn)此方法存在三個(gè)致命問題：

1、獲取了很多系統(tǒng)服務(wù)：這些服務(wù)是沒有Activity、并且無法通過去掉系統(tǒng)APP被篩除的

2、獲取不到完整的APP列表：在博主的測試中，經(jīng)常發(fā)現(xiàn)掃描不到某QQ、某視頻等APP的BUG

3、獲取不到APP的啟動(dòng)Activity：這種方式只能獲取到APP所有的Activity，至于LauncherActivity是哪個(gè)，無從得知。盡管多數(shù)APP的Manifest文件首項(xiàng)就是LauncherActivity，但仍有很多反其道而行的應(yīng)用，如：某QQ

綜上所述，樓主極不推薦使用packageManager.getInstalledPackages方式獲取應(yīng)用列表！

· 推薦的方法：

//獲取用戶安裝的APP
    public static List<ResolveInfo> getInstalledApplication(Context context, boolean needSysAPP) {
        PackageManager packageManager = context.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> resolveInfos = packageManager.queryIntentActivities(intent, 0);
        if (!needSysAPP) {
            List<ResolveInfo> resolveInfosWithoutSystem = new ArrayList<>();
            for (int i = 0; i < resolveInfos.size(); i++) {
                ResolveInfo resolveInfo = resolveInfos.get(i);
                try {
                    if (!isSysApp(context, resolveInfo.activityInfo.packageName)) {
                        resolveInfosWithoutSystem.add(resolveInfo);
                    }
                } catch (PackageManager.NameNotFoundException e) {
                    e.printStackTrace();
                }
            }
            return resolveInfosWithoutSystem;
        }
        return resolveInfos;
    }

    //判斷是否系統(tǒng)應(yīng)用
    public static boolean isSysApp(Context context, String packageName) throws PackageManager.NameNotFoundException {
        PackageInfo packageInfo = context.getPackageManager().getPackageInfo(packageName, 0);
        return (packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 1;
    }

· 一些常見數(shù)據(jù)的獲?。?/p>

//包名
resolveInfo.activityInfo.packageName
 
//啟動(dòng)Activity
resolveInfo.activityInfo.name 
 
//APP名
resolveInfo.activityInfo.applicationInfo.loadLabel(getPackageManager())
 
//Icon
resolveInfo.activityInfo.applicationInfo.loadIcon(getPackageManager())
 
//APK安裝包路徑
resolveInfo.activityInfo.applicationInfo.sourceDir