无需root,清除清理安卓,android的cache，缓存

最新推荐文章于 2024-04-29 14:13:48 发布

原创最新推荐文章于 2024-04-29 14:13:48 发布 · 1.1w 阅读

CC 4.0 BY-SA版权

本文介绍如何通过调用Android系统的API来实现清理应用缓存的功能，包括使用PackageManager类的方法来释放存储并通知，以及如何自定义IPackageDataObserver接口来接收清除完成的回调。

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);
}