通过查看手机设置(setting)源代码，发现它里面获取应用大小和缓存大小是通过PackageManager里面的getPackageSizeInfo方法。然而此方法时私有的，因此通过反射调用此方法。里面要用到IPackageStatsObserver接口，它是一个aidl方式进行访问。
package cn.itcast.testclear; import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set; import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.content.pm.IPackageStatsObserver;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageStats;
import android.net.Uri;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView; public class DemoActivity extends ListActivity {
private PackageManager pm;
private ListView lv;
private MyAdapter adapter; private Map<String, CacheInfo> maps; /** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pm = getPackageManager();
maps = new HashMap<String, CacheInfo>();
lv = getListView(); // lv.setAdapter(adapter); // 1.获取所有的安装好的应用程序 List<PackageInfo> packageinfos = pm.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);
for (PackageInfo info : packageinfos) {
String name = info.applicationInfo.loadLabel(pm).toString();
String packname = info.packageName;
CacheInfo cacheinfo = new CacheInfo();
cacheinfo.setName(name);
cacheinfo.setPackname(packname);
maps.put(packname, cacheinfo);
getAppSize(packname);
} adapter = new MyAdapter();
lv.setAdapter(adapter); lv.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
/*
*
* <intent-filter> <action android:name="android.settings.APPLICATION_DETAILS_SETTINGS" /> <category
* android:name="android.intent.category.DEFAULT" /> <data android:scheme="package" /> </intent-filter>
*/
/*
* 2.2 <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT"
* /> <category android:name="android.intent.category.VOICE_LAUNCH" /> </intent-filter>
*/
System.out.println("haha");
Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.addCategory("android.intent.category.VOICE_LAUNCH");
CacheInfo info = (CacheInfo) lv.getItemAtPosition(position);
intent.putExtra("pkg", info.getPackname());//传递所在包
startActivity(intent);
}
}); } /**
* 根据包名获取应用程序的体积信息 注意: 这个方法是一个异步的方法 程序的体积要花一定时间才能获取到.
*
* @param packname
*/
private void getAppSize(final String packname) {
try {
Method method = PackageManager.class.getMethod("getPackageSizeInfo", new Class[]{String.class,
IPackageStatsObserver.class});
method.invoke(pm, new Object[]{packname,
new IPackageStatsObserver.Stub() {
public void onGetStatsCompleted(PackageStats pStats,boolean succeeded) throws RemoteException {
// 注意这个操作是一个异步的操作
long cachesize = pStats.cacheSize;
long codesize = pStats.codeSize;
long datasize = pStats.dataSize;
CacheInfo info = maps.get(packname);
info.setCache_size(TextFormater.getDataSize(cachesize));
info.setData_size(TextFormater.getDataSize(datasize));
info.setCode_size(TextFormater.getDataSize(codesize));
maps.put(packname, info); }
}}); } catch (Exception e) {
e.printStackTrace();
}
} private class MyAdapter extends BaseAdapter { private Set<Entry<String, CacheInfo>> sets;
private List<CacheInfo> cacheinfos; public MyAdapter() {
sets = maps.entrySet();
cacheinfos = new ArrayList<CacheInfo>();
for (Entry<String, CacheInfo> entry : sets) {
cacheinfos.add(entry.getValue());
} } public int getCount() {
return cacheinfos.size();
} public Object getItem(int position) {
return cacheinfos.get(position);
} public long getItemId(int position) {
return position;
} public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
CacheInfo info = cacheinfos.get(position);
if (convertView == null) {
view = View.inflate(DemoActivity.this, R.layout.item, null);
} else {
view = convertView;
}
TextView tv_cache_size = (TextView) view.findViewById(R.id.tv_cache_size);
TextView tv_code_size = (TextView) view.findViewById(R.id.tv_code_size);
TextView tv_data_size = (TextView) view.findViewById(R.id.tv_data_size);
TextView tv_name = (TextView) view.findViewById(R.id.tv_name);
tv_cache_size.setText(info.getCache_size());
tv_code_size.setText(info.getCode_size());
tv_data_size.setText(info.getData_size());
tv_name.setText(info.getName());
return view;
} } }
package cn.itcast.testclear;
public class CacheInfo {
//应用名称
private String name;
//应用所在包名
private String packname;
//
private String code_size;
//数据大小
private String data_size;
//缓存大小
private String cache_size;
}
public class TextFormater {
/**
* 返回byte的数据大小对应的文本
*
* @param size
* @return
*/
public static String getDataSize(long size) {
if (size < 0) {
size = 0;
}
DecimalFormat formater = new DecimalFormat("####.00");
if (size < 1024) {
return size + "bytes";
} else if (size < 1024 * 1024) {
float kbsize = size / 1024f;
return formater.format(kbsize) + "KB";
} else if (size < 1024 * 1024 * 1024) {
float mbsize = size / 1024f / 1024f;
return formater.format(mbsize) + "MB";
} else if (size < 1024 * 1024 * 1024 * 1024) {
float gbsize = size / 1024f / 1024f / 1024f;
return formater.format(gbsize) + "GB";
} else {
return "size: error";
}
}
/**
* 返回kb的数据大小对应的文本
*
* @param size
* @return
*/
public static String getKBDataSize(long size) {
if (size < 0) {
size = 0;
}
return getDataSize(size * 1024);
}
}
aidl文件：IPackageStatsObserver.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);
}
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;