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我正在尝试获取当前在我的 android 手机中运行的所有应用程序名称，并将它们显示在 logcat 中。这是在后台完成的，所以我正在使用service该类。我的代码如下：

public class Timer extends Service {
  
    public Timer() {
    }

    @Override
    public void onCreate() {
        if(!needPermissionForBlocking(getApplicationContext())) {
            startActivity(new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS));
        }
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        UsageStatsManager usm = (UsageStatsManager)this.getSystemService(Context.USAGE_STATS_SERVICE);
        long time = System.currentTimeMillis();
        List<UsageStats> appList = usm.queryUsageStats(UsageStatsManager.INTERVAL_DAILY,  time - 10000*10000, time);
        if (appList.size() == 0) {
            Log.d("Executed app", "######### NO APP FOUND ##########" );
        }
        else {
            SortedMap<Long, UsageStats> mySortedMap = new TreeMap<Long, UsageStats>();
            for (UsageStats usageStats : appList) {
                Log.d("Executed app", "usage stats executed : " +usageStats.getPackageName() + "\t\t ID: ");
                mySortedMap.put(usageStats.getLastTimeUsed(), usageStats);
                if (!mySortedMap.isEmpty()) {
                    String currentApp = mySortedMap.get(mySortedMap.lastKey()).getPackageName();
                    Log.d("app",currentApp);
                }
            }

        }
        
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public IBinder onBind(Intent intent) {
        throw new UnsupportedOperationException("Not yet implemented");
    }

    public static boolean needPermissionForBlocking(Context context){
        try {
            PackageManager packageManager = context.getPackageManager();
            ApplicationInfo applicationInfo = packageManager.getApplicationInfo(context.getPackageName(), 0);
            AppOpsManager appOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
            int mode = appOpsManager.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS, applicationInfo.uid, applicationInfo.packageName);
            return  (mode != AppOpsManager.MODE_ALLOWED);
        } catch (PackageManager.NameNotFoundException e) {
            return true;
        }
    }
}

但是无论我运行多少应用程序，代码每次都会显示日志

“已执行的应用程序”、“######### 未找到应用程序##########”

我还在清单中添加了以下权限：

<uses-permission
        android:name="android.permission.PACKAGE_USAGE_STATS"
        tools:ignore="ProtectedPermissions" />

我在这里做错了什么？为什么它无法获取我设备上正在运行的应用程序？

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0 回答 0