IPackageStatsObserver无法解析为类型（Android）

Question

我想计算利用该设备的所有缓存的总和。为此，我收到了编译时间错误：

IPackageStatsObserver cannot be resolved to a type

我在代码中两次提到此错误：

public long totalCacheSize(){
    totalSize=0;

    PackageManager packageManager = getApplicationContext().getPackageManager();

     /* List<PackageInfo> packs = packageManager
      .getInstalledPackages(PackageManager.GET_ACTIVITIES);*/
     // PackageManager.GET_META_DATA

    List<PackageInfo> packs = packageManager
            .getInstalledPackages(PackageManager.GET_META_DATA);

    for (int i = 0; i < packs.size(); i++) {

        PackageInfo p = packs.get(i);

        Method getPackageSizeInfo;
        try {
            getPackageSizeInfo = packageManager.getClass()
                    .getMethod("getPackageSizeInfo",
                        String.class, Class.forName("android.content.pm.IPackageStatsObserver"));

            getPackageSizeInfo.invoke(packageManager, p.packageName,
                    new IPackageStatsObserver.Stub() { //error

                        public void onGetStatsCompleted(
                                PackageStats pStats, boolean succeeded)
                                throws RemoteException {

                            totalSize = totalSize + pStats.cacheSize;
                            Log.d("size", totalSize+"");
                            Toast.makeText(getApplicationContext(), "size"+totalSize, Toast.LENGTH_SHORT).show();
                        }
                    }
            );

        } catch (Exception e) {
            try {
                getPackageSizeInfo = packageManager.getClass()
                        .getMethod("getPackageSizeInfo",
                            String.class, Class.forName("android.content.pm.IPackageStatsObserver"));

                getPackageSizeInfo.invoke(packageManager, p.packageName,
                        new IPackageStatsObserver.Stub() { //error

                            public void onGetStatsCompleted(
                                    PackageStats pStats, boolean succeeded)
                                    throws RemoteException {

                                totalSize = totalSize + pStats.cacheSize;
                                Log.d("size", totalSize+"");
                                Toast.makeText(getApplicationContext(), "size"+totalSize, Toast.LENGTH_SHORT).show();
                            }
                        }
                );
            } catch (Exception ee) {
                Log.d("eeeeeeeeeee", "error");
                ee.printStackTrace();
            } 
        } 
    }

    Log.d("return size", totalSize+"");
    Toast.makeText(getApplicationContext(), "return size"+totalSize, Toast.LENGTH_SHORT).show();
    return totalSize;
}

IPackageStatsObserver在android
SDK中不可用。也许使用加载Stub类Class.forName()，找到默认的构造函数并调用它以获得a的新实例Stub。但是我应该怎么编码，对此我一无所知！

救命 ！！

Answer 1

要解决您的问题，请按照下列步骤操作：

Android Studio

• 右键单击项目 新建 >文件夹> AIDL文件夹
• 按 完成
• 右键单击aidl文件夹 New > Package
• 插入android.content.pm并按 确定
• 下载IPackageStatsObserver.aidl
• 复制android.content.pm包内的帮助文件
• 生成 >重建项目

蚀

• 右键单击src文件夹 New > Package
• 插 android.content.pm
• 按 完成
• 下载IPackageStatsObserver.aidl
• 复制android.content.pm包内的帮助文件
• 选择类别，totalCacheSize然后选择 来源 >组织导入