获取资源值时没有包标识符

Question

我正在尝试获取第三方和系统设备上所有应用程序的列表，我运行在 AsyncTask 中执行此操作，当应用程序打开任务运行时，我看到在此操作期间获取此列表时的长时间操作我看到 Logcat 中打印的警告，我认为这是长时间操作背后的原因：

11-26 09:51:23.720 1739-1846/com.example.AppList W/ResourceType: No package identifier when getting value for resource number 0x00000000
11-26 09:51:23.720 1739-1846/com.example.AppList W/PackageManager: Failure retrieving resources for com.google.android.onetimeinitializer: Resource ID #0x0
11-26 09:51:23.870 1739-1846/com.example.AppList W/ResourceType: No package identifier when getting value for resource number 0x00000000
11-26 09:51:23.870 1739-1846/com.example.AppList W/PackageManager: Failure retrieving resources for com.qualcomm.shutdownlistner: Resource ID #0x0
11-26 09:51:23.994 1739-1846/com.example.AppList W/ResourceType: No package identifier when getting value for resource number 0x00000000
11-26 09:51:23.994 1739-1846/com.example.AppList W/PackageManager: Failure retrieving resources for com.android.wallpapercropper: Resource ID #0x0
11-26 09:51:24.744 1739-1846/com.example.AppList W/ResourceType: No package identifier when getting value for resource number 0x00000000
11-26 09:51:24.744 1739-1846/com.example.AppList W/PackageManager: Failure retrieving resources for com.android.documentsui: Resource ID #0x0
11-26 09:51:24.873 1739-1846/com.example.AppList W/ResourceType: No package identifier when getting value for resource number 0x00000000
11-26 09:51:24.874 1739-1846/com.example.AppList W/PackageManager: Failure retrieving resources for com.android.externalstorage: Resource ID #0x0
                                      ....
                                      ....
/** 
 * I got all installed and system apps on the device
 * listed as the above in the logcat as Warning.
 */
                                      ....
                                      .... to the end.

这是doInBackground代码：

@Override
    protected final List<App> doInBackground(List<App>... params) {

        PackageManager pm = getActivity().getPackageManager();
        List<ApplicationInfo> appsList = pm.getInstalledApplications(0);
        List<PackageInfo> packList = pm.getInstalledPackages(0);
        List<App> userApps = new ArrayList<>();
        int totalApp = appsList.size();

        for (int i = 0; i < totalApp; i++) {
            ApplicationInfo info = appsList.get(i);
            final App app = new App();

            app.setIcon(info.loadIcon(getActivity().getPackageManager()));
            app.setName(info.loadLabel(getActivity().getPackageManager()).toString());
            app.setPackageName(info.packageName);

            if ((info.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
                userApps.add(app);
            }
        }
        return userApps;
    }

那么如何解决这个问题，或者只是如何解决长时间操作？

编辑

我试图从列表中删除应用程序图标功能，它的加载速度比附加图像时快，所以图像中存在问题

@David Corsalini 在 comments 中告诉我：

Load the bitmap in a background thread, call this background thread from the holder.bind() method. I don't have the code for this one.

我正在使用 ListView 和 ViewHolder，但不知道 holder.bind()，请问如何实现？！

Answer 1

加载应用程序图标需要很长时间，因为您将所有应用程序图标作为可绘制对象存储在一个大列表中 - 这不是一个好主意，除非您必须这样做。相反，我建议在您的 App class 中删除 "icon" 变量并在您的列表适配器中加载该图标。在列表适配器的 getView 方法中，您可以如下设置图标可绘制对象：

    Drawable icon;
    try {
        icon = context.getPackageManager().getApplicationIcon(packageName);
    } catch (PackageManager.NameNotFoundException ex) {
        Log.e(TAG, "Error", ex);
        icon = context.getResources().getDrawable(R.drawable.icon_default);
    }

    holder.imageview.setImageDrawable(icon);

我不知道你是如何实现你的适配器的，但我的建议是提供你在后台任务中收集的 App 对象的列表，并提供这些 App 对象的包名称。希望对你有帮助。

获取资源值时没有包标识符

No package identifier when getting value for resource

android

asynchronous

android-asynctask

logcat

android-package-managers