Android工具开发一（清除手机所有app缓存）

Android手机缓存的清理

步骤

1.获取手机所有app缓存

2.清理缓存

3.获取所有app缓存（检查第二步是否成功）

代码

package com.pythoncat.clearcache;

import android.content.pm.IPackageDataObserver;
import android.content.pm.IPackageStatsObserver;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageStats;
import android.os.Bundle;
import android.os.Handler;
import android.os.RemoteException;
import android.support.v7.app.AppCompatActivity;
import android.text.format.Formatter;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.lang.reflect.Method;
import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private TextView tvShowCaches, tvAppCache;
private Button btnScanCache, btnClearAll;

private PackageManager pm;
StringBuilder sb = new StringBuilder();
StringBuilder sbCache = new StringBuilder();

private long cacheS;
Handler mHadler = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnScanCache = (Button) findViewById(R.id.btn_scanCache);
btnClearAll = (Button) findViewById(R.id.btn_clearAll);
tvShowCaches = (TextView) findViewById(R.id.tv_showAppInfo);
tvAppCache = (TextView) findViewById(R.id.tv_appCache);
sbCache.append("所有缓存：\n");
tvAppCache.setText(sbCache.toString());
btnScanCache.setOnClickListener(this);
btnClearAll.setOnClickListener(this);
}

@Override
public void onClick(View v) {
cacheS = 0;
if (v.getId() == btnScanCache.getId()) {
getCaches();
//            ==========获取每个app的缓存
} else if (v.getId() == btnClearAll.getId()) {
cleanAll(v);
getCaches();
}
}

class MyPackageStateObserver extends IPackageStatsObserver.Stub {

@Override
public void onGetStatsCompleted(PackageStats pStats, boolean succeeded) throws RemoteException {
String packageName = pStats.packageName;
long cacheSize = pStats.cacheSize;
long codeSize = pStats.codeSize;
long dataSize = pStats.dataSize;
cacheS += cacheSize;
//            sb.delete(0, sb.length());
if (cacheSize > 0) {
sb.append("packageName = " + packageName + "\n")
.append("   cacheSize: " + cacheSize + "\n")
.append("   dataSize: " + dataSize + "\n")
.append("-----------------------\n")
;

Log.e("aaaa", sb.toString());
}

}
}

class ClearCacheObj extends IPackageDataObserver.Stub {

@Override
public void onRemoveCompleted(String packageName, final boolean succeeded) throws RemoteException {
mHadler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), "清楚状态： " + succeeded, Toast.LENGTH_SHORT).show();
}
});
}
}

/**
* 清理全部应用程序缓存的点击事件
*
* @param view
*/
public void cleanAll(View view) {
//freeStorageAndNotify
Method[] methods = PackageManager.class.getMethods();
for (Method method : methods) {
if ("freeStorageAndNotify".equals(method.getName())) {
try {
method.invoke(pm, Long.MAX_VALUE, new ClearCacheObj());
} catch (Exception e) {
e.printStackTrace();
}
return;
}
}
}

private void getCaches(){
// scan
pm = getPackageManager();
List<PackageInfo> packages = pm.getInstalledPackages(0);

int max = packages.size();
int current = 0;
sb.delete(0, sb.length());
sb.append("所有已安装的app信息：\n");
sb.append("所有App 总和：" + max + " \n");
tvShowCaches.setText(sb.toString());
for (PackageInfo pinfo : packages) {
String packageName = pinfo.packageName;
try {

Method getPackageSizeInfo = PackageManager.class
.getDeclaredMethod("getPackageSizeInfo", String.class, IPackageStatsObserver.class);
getPackageSizeInfo.invoke(pm, packageName, new MyPackageStateObserver());
current++;
} catch (Exception e) {
current++;
e.printStackTrace();
}

}
//===到这里，数据准备完成
mHadler.postDelayed(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),"缓存信息获取完成",Toast.LENGTH_SHORT).show();
sbCache.append(Formatter.formatFileSize(getApplicationContext(),cacheS)+"\n");
tvShowCaches.setText(sb.toString());
tvAppCache.setText(sbCache.toString());
sbCache.delete(0,sbCache.length());
}
}, 1000);
//ok,所有应用程序信息显示完成
}
}

所需权限

<!-- 清除缓存时需要此权限 -->
<uses-permission android:name="android.permission.CLEAR_APP_CACHE" />
<uses-permission android:name="android.permission.GET_PACKAGE_SIZE"/>

4.所需AIDL文件

android/content/pm/IPackageDataObserver.aidl
android/content/pm/IPackageStatsObserver.aidl
android/content/pm/PackageStats.aidl

*1.PackageStats.aidl

/* //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;

* 2.IPackageDataObserver

/*
**
** 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);
}

* 3.IPackageStatsObserver

/*
**
** 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);
}

5.运行环境 Android 5.0

6.开发环境 Android Studio

7.运行效果，OK。

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