无需root,清除清理安卓,android的cache，缓存

package com.agj.test;

import java.io.File;
import java.lang.reflect.Method;

import android.content.Context;
import android.content.pm.IPackageDataObserver;
import android.content.pm.PackageManager;
import android.os.Environment;
import android.os.RemoteException;
import android.os.StatFs;

/**
* 1.功能相当于,点击了 应用程序信息 里面的 清楚缓存按钮，而非 清除数据
*
* 2.功能相当于,删除了/data/data/packageName/cache 文件夹里面所有的东西
*
* 3.需要权限 <uses-permission android:name="android.permission.CLEAR_APP_CACHE" />
*/
public class CacheClearHelper {

public static void clearCache(Context context) {

try {
PackageManager packageManager = context.getPackageManager();
Method localMethod = packageManager.getClass().getMethod("freeStorageAndNotify", Long.TYPE,
IPackageDataObserver.class);
Long localLong = Long.valueOf(getEnvironmentSize() - 1L);
Object[] arrayOfObject = new Object[2];
arrayOfObject[0] = localLong;
localMethod.invoke(packageManager, localLong, new IPackageDataObserver.Stub() {

@Override
public void onRemoveCompleted(String packageName, boolean succeeded) throws RemoteException {
}
});
} catch (Exception e) {
e.printStackTrace();
}
}

private static long getEnvironmentSize() {
File localFile = Environment.getDataDirectory();
long l1;
if (localFile == null)
l1 = 0L;
while (true) {
String str = localFile.getPath();
StatFs localStatFs = new StatFs(str);
long l2 = localStatFs.getBlockSize();
l1 = localStatFs.getBlockCount() * l2;
return l1;
}

}
}

另外，IPackageDataObserver这个类找不到的话，那么就自己新建一个，建成如下的样子：



IPackageDataObserver.aidl的内容是：

/*

**

** 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;

/**

* 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 IPackageDataObserver {

void onRemoveCompleted(in String packageName, boolean succeeded);

}