Android之lrucache原理以及获取系统应用和启动系统应用

来源：互联网发布：mysql并发insert死锁编辑：程序博客网时间：2024/06/04 19:43

Lru的全称是Least Recently Used ，近期最少使用的！LruCache 的实现原理：把近期最少使用的数据从缓存中移除，保留使用最频繁的数据

  private ArrayList<AppInfo> getAppInfo() {        ArrayList<AppInfo> appList = new ArrayList<>();//存储应用信息        List<PackageInfo> packageInfos = getPackageManager().getInstalledPackages(0);        for (int i = 0; i < packageInfos.size(); i++) {            PackageInfo packageInfo = packageInfos.get(i);            AppInfo appInfo = new AppInfo();            appInfo.appName = packageInfo.applicationInfo.loadLabel(getPackageManager()).toString();            appInfo.packageName = packageInfo.packageName;            appInfo.versionCode = packageInfo.versionCode;            appInfo.appIcon = packageInfo.applicationInfo.loadIcon(getPackageManager());            //非系统应用            if((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0)            appList.add(appInfo);        }

// 桌面应用的启动在INTENT中需要包含ACTION_MAIN 和CATEGORY_HOME.        ArrayList<AppInfo> appList = new ArrayList<>();//存储应用信息        Intent intent = new Intent();        intent.addCategory(Intent.CATEGORY_LAUNCHER);        intent.setAction(Intent.ACTION_MAIN);        PackageManager manager = getPackageManager();        List<ResolveInfo> list = manager.queryIntentActivities(intent, 0);        //     List<PackageInfo> packageInfos = manager.getInstalledPackages(0);        for (int i = 0; i < list.size(); i++) {            AppInfo appInfo = new AppInfo();            ResolveInfo resolveInfo = list.get(i);            appInfo.appName = resolveInfo.loadLabel(manager).toString();            appInfo.packageName = resolveInfo.activityInfo.packageName.toString();            appInfo.mBitmapBytes = BitmapDrawableExchange.drawableToBytes(resolveInfo.loadIcon(manager));            //  appInfo.appIcon = (BitmapDrawable) resolveInfo.loadIcon(manager);            if (!appInfo.packageName.equals("com.example.myapplication")) {                boolean flag = true;                if (addedList.size() != 0) {                    for (int j = 0; j < addedList.size(); j++) {                        if (appInfo.packageName.equals(addedList.get(j).packageName)) {                            flag = false;                        }                    }                }                if (flag)                    appList.add(appInfo);            }

    public void startApp(String packageName) {        Intent intent = MainActivity.this.getPackageManager()                .getLaunchIntentForPackage(packageName);        // 已安装包 直接启动        if (intent != null) {            startActivity(intent);        }    }

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