Android獲取應用程序大小和緩存的實例代碼

info

package com.qin.appsize;

import android.content.Intent;
import android.graphics.drawable.Drawable;

//Model類 ，用來存儲應用程序信息
public class AppInfo {

    private String appLabel;    //應用程序標籤
    private Drawable appIcon ;  //應用程序圖像
    private Intent intent ;     //啓動應用程序的Intent ，一般是Action爲Main和Category爲Lancher的Activity
    private String pkgName ;    //應用程序所對應的包名

    private long cachesize ;   //緩存大小
    private long datasize ;    //數據大小
    private long codesieze ;   //應用程序大小


    public long getCachesize() {
        return cachesize;
    }

    public void setCachesize(long cachesize) {
        this.cachesize = cachesize;
    }

    public long getDatasize() {
        return datasize;
    }

    public void setDatasize(long datasize) {
        this.datasize = datasize;
    }

    public long getCodesieze() {
        return codesieze;
    }

    public void setCodesieze(long codesieze) {
        this.codesieze = codesieze;
    }

    public AppInfo(){}

    public String getAppLabel() {
        return appLabel;
    }
    public void setAppLabel(String appName) {
        this.appLabel = appName;
    }
    public Drawable getAppIcon() {
        return appIcon;
    }
    public void setAppIcon(Drawable appIcon) {
        this.appIcon = appIcon;
    }
    public Intent getIntent() {
        return intent;
    }
    public void setIntent(Intent intent) {
        this.intent = intent;
    }
    public String getPkgName(){
        return pkgName ;
    }
    public void setPkgName(String pkgName){
        this.pkgName=pkgName ;
    }
}

自定義的類

package com.qin.appsize;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

//自定義適配器類，提供給listView的自定義view
public class BrowseApplicationInfoAdapter extends BaseAdapter {

    private List<AppInfo> mlistAppInfo = null;

    LayoutInflater infater = null;

    public BrowseApplicationInfoAdapter(Context context,  List<AppInfo> apps) {
        infater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mlistAppInfo = apps ;
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        System.out.println("size" + mlistAppInfo.size());
        return mlistAppInfo.size();
    }
    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return mlistAppInfo.get(position);
    }
    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }
    @Override
    public View getView(int position, View convertview, ViewGroup arg2) {
        System.out.println("getView at " + position);
        View view = null;
        ViewHolder holder = null;
        if (convertview == null || convertview.getTag() == null) {
            view = infater.inflate(R.layout.browse_app_item, null);
            holder = new ViewHolder(view);
            view.setTag(holder);
        } 
        else{
            view = convertview ;
            holder = (ViewHolder) convertview.getTag() ;
        }
        AppInfo appInfo = (AppInfo) getItem(position);
        holder.appIcon.setImageDrawable(appInfo.getAppIcon());
        holder.tvAppLabel.setText(appInfo.getAppLabel());
        holder.tvPkgName.setText(appInfo.getPkgName());
        return view;
    }

    class ViewHolder {
        ImageView appIcon;
        TextView tvAppLabel;
        TextView tvPkgName;

        public ViewHolder(View view) {
            this.appIcon = (ImageView) view.findViewById(R.id.imgApp);
            this.tvAppLabel = (TextView) view.findViewById(R.id.tvAppLabel);
            this.tvPkgName = (TextView) view.findViewById(R.id.tvPkgName);
        }
    }
}

主類

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 ; 
    //全局變量，保存當前查詢包得信息
    private long cachesize ; //緩存大小
    private long datasize  ;  //數據大小 
    private long codesize  ;  //應用程序大小
    private long totalsize ; //總大小
    @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(); // 查詢所有應用程序信息
        BrowseApplicationInfoAdapter browseAppAdapter = new BrowseApplicationInfoAdapter(
                this, mlistAppInfo);
        listview.setAdapter(browseAppAdapter);
        listview.setOnItemClickListener(this);
    }
     // 點擊彈出對話框，顯示該包得大小
    public void onItemClick(AdapterView<?> arg0, View view, int position,long arg3) {

        //更新顯示當前包得大小信息
        try {
            queryPacakgeSize(mlistAppInfo.get(position).getPkgName());
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 

        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) ; //緩存大小
        TextView tvdatasize = (TextView) dialog.findViewById(R.id.tvdatasize)  ; //數據大小
        TextView tvcodesize = (TextView) dialog.findViewById(R.id.tvcodesize) ; // 應用程序大小
        TextView tvtotalsize = (TextView) dialog.findViewById(R.id.tvtotalsize) ; //總大小
        //類型轉換並賦值
        tvcachesize.setText(formateFileSize(cachesize));
        tvdatasize.setText(formateFileSize(datasize)) ;
        tvcodesize.setText(formateFileSize(codesize)) ;
        tvtotalsize.setText(formateFileSize(totalsize)) ;
        //顯示自定義對話框
        AlertDialog.Builder builder =new AlertDialog.Builder(MainActivity.this) ;
        builder.setView(dialog) ;
        builder.setTitle(mlistAppInfo.get(position).getAppLabel()+"的大小信息爲：") ;
        builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                dialog.cancel() ;  // 取消顯示對話框
            }

        });
        builder.create().show() ;
    }
    public void  queryPacakgeSize(String pkgName) throws Exception{
        if ( pkgName != null){
            //使用放射機制得到PackageManager類的隱藏函數getPackageSizeInfo
            PackageManager pm = getPackageManager();  //得到pm對象
            try {
                //通過反射機制獲得該隱藏函數
                Method getPackageSizeInfo = pm.getClass().getDeclaredMethod("getPackageSizeInfo", String.class,IPackageStatsObserver.class);
                //調用該函數，並且給其分配參數 ，待調用流程完成後會回調PkgSizeObserver類的函數
                getPackageSizeInfo.invoke(pm, pkgName,new PkgSizeObserver());
            } 
            catch(Exception ex){
                Log.e(TAG, "NoSuchMethodException") ;
                ex.printStackTrace() ;
                throw ex ;  // 拋出異常
            } 
        }
    }

    //aidl文件形成的Bindler機制服務類
    public class PkgSizeObserver extends IPackageStatsObserver.Stub{
        /*** 回調函數，
         * @param pStatus ,返回數據封裝在PackageStats對象中
         * @param succeeded  代表回調成功
         */ 
        @Override
        public void onGetStatsCompleted(PackageStats pStats, boolean succeeded)
                throws RemoteException {
            // TODO Auto-generated method stub
            cachesize = pStats.cacheSize  ; //緩存大小
            datasize = pStats.dataSize  ;  //數據大小 
            codesize =  pStats.codeSize  ;  //應用程序大小
            totalsize = cachesize + datasize + codesize ;
            Log.i(TAG, "cachesize--->"+cachesize+" datasize---->"+datasize+ " codeSize---->"+codesize)  ;
        }
    }
    //系統函數，字符串轉換 long -String (kb)
    private String formateFileSize(long size){
        return Formatter.formatFileSize(MainActivity.this, size); 
    }
   // 獲得所有啓動Activity的信息，類似於Launch界面
    public void queryAppInfo() {
        PackageManager pm = this.getPackageManager(); // 獲得PackageManager對象
        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        // 通過查詢，獲得所有ResolveInfo對象.
        List<ResolveInfo> resolveInfos = pm.queryIntentActivities(mainIntent, 0);
        // 調用系統排序 ， 根據name排序
        // 該排序很重要，否則只能顯示系統應用，而不能列出第三方應用程序
        Collections.sort(resolveInfos,new ResolveInfo.DisplayNameComparator(pm));
        if (mlistAppInfo != null) {
            mlistAppInfo.clear();
            for (ResolveInfo reInfo : resolveInfos) {
                String activityName = reInfo.activityInfo.name; // 獲得該應用程序的啓動Activity的name
                String pkgName = reInfo.activityInfo.packageName; // 獲得應用程序的包名
                String appLabel = (String) reInfo.loadLabel(pm); // 獲得應用程序的Label
                Drawable icon = reInfo.loadIcon(pm); // 獲得應用程序圖標
                // 爲應用程序的啓動Activity 準備Intent
                Intent launchIntent = new Intent();
                launchIntent.setComponent(new ComponentName(pkgName,activityName));
                // 創建一個AppInfo對象，並賦值
                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
            }
        }
    }
}