/*@param packageName 应用程序包名

     *@param observer    当查询包得信息大小操作完成后，将回调给IPackageStatsObserver类中的onGetStatsCompleted()方法，

     *      ,并且我们需要的PackageStats对象也封装在其参数里.

     * @hide //隐藏函数的标记

     */

       public abstract void getPackageSizeInfo(String packageName,IPackageStatsObserver observer);{

          //

       }

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);

}

package android.content.pm;  

parcelable PackageStats;

//aidl文件形成的Bindler机制服务类

   public class PkgSizeObserver extends IPackageStatsObserver.Stub{

       /*** 回调函数，

        * @param pStatus ,返回数据封装在PackageStats对象中

        * @param succeeded  代表回调成功

        */

@Override

public void onGetStatsCompleted(PackageStats pStats, boolean succeeded)

        throws RemoteException {

   // TODO Auto-generated method stub

   cachesize = pStats.cacheSize  ; //缓存大小

          datasize = pStats.codeSize  ;  //数据大小

          codesize =    pStats.codeSize  ;  //应用程序大小

     }

  }  

package com.qin.appsize;  

import java.lang.reflect.Method;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;  

import com.qin.appsize.AppInfo;  

import android.app.Activity;

import android.app.AlertDialog;

import android.content.ComponentName;

import android.content.Context;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.pm.IPackageStatsObserver;

import android.content.pm.PackageManager;

import android.content.pm.PackageStats;

import android.content.pm.ResolveInfo;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.os.RemoteException;

import android.text.format.Formatter;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.AdapterView.OnItemClickListener;  

public class MainActivity extends Activity implements OnItemClickListener{

    private static String TAG = "APP_SIZE";  

    private ListView listview = null;

    private List<AppInfo> mlistAppInfo = null;

    LayoutInflater infater = null ;

    //全局变量，保存当前查询包得信息

    private long cachesize ; //缓存大小

    private long datasize  ;  //数据大小

    private long codesize  ;  //应用程序大小

    private long totalsize ; //总大小

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.browse_app_list);

        listview = (ListView) findViewById(R.id.listviewApp);

        mlistAppInfo = new ArrayList<AppInfo>();

        queryAppInfo(); // 查询所有应用程序信息

        BrowseApplicationInfoAdapter browseAppAdapter = new BrowseApplicationInfoAdapter(

                this, mlistAppInfo);

        listview.setAdapter(browseAppAdapter);

        listview.setOnItemClickListener(this);

    }

     // 点击弹出对话框，显示该包得大小

    public void onItemClick(AdapterView<?> arg0, View view, int position,long arg3) {

        //更新显示当前包得大小信息

        queryPacakgeSize(mlistAppInfo.get(position).getPkgName());   

        infater = (LayoutInflater) MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View dialog = infater.inflate(R.layout.dialog_app_size, null) ;

        TextView tvcachesize =(TextView) dialog.findViewById(R.id.tvcachesize) ; //缓存大小

        TextView tvdatasize = (TextView) dialog.findViewById(R.id.tvdatasize)  ; //数据大小

        TextView tvcodesize = (TextView) dialog.findViewById(R.id.tvcodesize) ; // 应用程序大小

        TextView tvtotalsize = (TextView) dialog.findViewById(R.id.tvtotalsize) ; //总大小

        //类型转换并赋值

        tvcachesize.setText(formateFileSize(cachesize));

        tvdatasize.setText(formateFileSize(datasize)) ;

        tvcodesize.setText(formateFileSize(codesize)) ;

        tvtotalsize.setText(formateFileSize(totalsize)) ;

        //显示自定义对话框

        AlertDialog.Builder builder =new AlertDialog.Builder(MainActivity.this) ;

        builder.setView(dialog) ;

        builder.setTitle(mlistAppInfo.get(position).getAppLabel()+"的大小信息为：") ;

        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  

            @Override

            public void onClick(DialogInterface dialog, int which) {

                // TODO Auto-generated method stub

                dialog.cancel() ;  // 取消显示对话框

            }  

        });

        builder.create().show() ;

    }

    public void  queryPacakgeSize(String pkgName) throws Exception{

        if ( pkgName != null){

            //使用放射机制得到PackageManager类的隐藏函数getPackageSizeInfo

            PackageManager pm = getPackageManager();  //得到pm对象

            try {

                //通过反射机制获得该隐藏函数

                Method getPackageSizeInfo = pm.getClass().getDeclaredMethod("getPackageSizeInfo", String.class,IPackageStatsObserver.class);

                //调用该函数，并且给其分配参数 ，待调用流程完成后会回调PkgSizeObserver类的函数

                getPackageSizeInfo.invoke(pm, pkgName,new PkgSizeObserver());

            }

            catch(Exception ex){

                Log.e(TAG, "NoSuchMethodException") ;

                ex.printStackTrace() ;

                throw ex ;  // 抛出异常

            }

        }

    }  

    //aidl文件形成的Bindler机制服务类

    public class PkgSizeObserver extends IPackageStatsObserver.Stub{

        /*** 回调函数，

         * @param pStatus ,返回数据封装在PackageStats对象中

         * @param succeeded  代表回调成功

         */

        @Override

        public void onGetStatsCompleted(PackageStats pStats, boolean succeeded)

                throws RemoteException {

            // TODO Auto-generated method stub

           cachesize = pStats.cacheSize  ; //缓存大小

            datasize = pStats.dataSize  ;  //数据大小

            codesize = pStats.codeSize  ;  //应用程序大小

            totalsize = cachesize + datasize + codesize ;

            Log.i(TAG, "cachesize--->"+cachesize+" datasize---->"+datasize+ " codeSize---->"+codesize)  ;

        }

    }

    //系统函数，字符串转换 long -String (kb)

    private String formateFileSize(long size){

        return Formatter.formatFileSize(MainActivity.this, size);

    }

   // 获得所有启动Activity的信息，类似于Launch界面

    public void queryAppInfo() {

        PackageManager pm = this.getPackageManager(); // 获得PackageManager对象

        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);

        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);

        // 通过查询，获得所有ResolveInfo对象.

        List<ResolveInfo> resolveInfos = pm.queryIntentActivities(mainIntent, 0);

        // 调用系统排序 ， 根据name排序

        // 该排序很重要，否则只能显示系统应用，而不能列出第三方应用程序

        Collections.sort(resolveInfos,new ResolveInfo.DisplayNameComparator(pm));

        if (mlistAppInfo != null) {

            mlistAppInfo.clear();

            for (ResolveInfo reInfo : resolveInfos) {

                String activityName = reInfo.activityInfo.name; // 获得该应用程序的启动Activity的name

                String pkgName = reInfo.activityInfo.packageName; // 获得应用程序的包名

                String appLabel = (String) reInfo.loadLabel(pm); // 获得应用程序的Label

                Drawable icon = reInfo.loadIcon(pm); // 获得应用程序图标

                // 为应用程序的启动Activity 准备Intent

                Intent launchIntent = new Intent();

                launchIntent.setComponent(new ComponentName(pkgName,activityName));

                // 创建一个AppInfo对象，并赋值

                AppInfo appInfo = new AppInfo();

                appInfo.setAppLabel(appLabel);

                appInfo.setPkgName(pkgName);

                appInfo.setAppIcon(icon);

                appInfo.setIntent(launchIntent);

                mlistAppInfo.add(appInfo); // 添加至列表中

            }

        }

    }

}