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）
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/**
* 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();
}
}
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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***************
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/* //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;
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****************IPackageStatusObserver.aidl******************
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/*
**
** 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);
}
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