Android获取app应用程序大小的方法

Android对这种方法进行了封装，我们没有权限去调用这个方法，所以我们只能通过AIDL，然后利用Java的反射机制去调用系统级的方法。

下面上代码：（注释比较详细）

/**
 * 作用：-----获取包的大小-----
 * @param context 上下文
 * @param pkgName app的包名
 * @param appInfo 实体类，用于存放App的某些信息
 */
public static void getPkgSize(final Context context, String pkgName, final PhoneAppInfo appInfo) {
 // getPackageSizeInfo是PackageManager中的一个private方法，所以需要通过反射的机制来调用
 Method method;
 try {
  method = PackageManager.class.getMethod("getPackageSizeInfo",
    new Class[]{String.class, IPackageStatsObserver.class});
  // 调用 getPackageSizeInfo 方法，需要两个参数：1、需要检测的应用包名；2、回调
  method.invoke(context.getPackageManager(), pkgName,
    new IPackageStatsObserver.Stub() {
     @Override
     public void onGetStatsCompleted(PackageStats pStats, boolean succeeded) throws RemoteException {
      if (succeeded && pStats != null) {
       synchronized (PhoneAppInfo.class) {
        appInfo.setCatchSize(pStats.cacheSize);//缓存大小
        appInfo.setDataSize(pStats.dataSize); //数据大小
        appInfo.setCodeSize(pStats.codeSize); //应用大小
        appInfo.setAppSize(pStats.cacheSize + pStats.codeSize + pStats.dataSize);//应用的总大小
        Log.d("asdasdxx",appInfo.getAppSize()+"");
       }
      }
     }
    });
 } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
  e.printStackTrace();
 }
}

下面是两个AIDL文件的代码。。。

步骤（Android Studio）：

1、在main文件夹下，建立一个aidl文件夹的文件夹

2、建立一个包，包名为android.content.pm

3、结构图

   *******PackageStats.aidl文件***************

/* //device/java/android/android/view/WindowManager.aidl
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**  http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
package android.content.pm;
parcelable PackageStats;

****************IPackageStatusObserver.aidl******************

/*
**
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**  http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
package android.content.pm;
import android.content.pm.PackageStats;
/**
* API for package data change related callbacks from the Package Manager.
* Some usage scenarios include deletion of cache directory, generate
* statistics related to code, data, cache usage(TODO)
* {@hide}
*/
oneway interface IPackageStatsObserver {
void onGetStatsCompleted(in PackageStats pStats, boolean succeeded);
}