案例：PackageManager

1。http://blog.csdn.net/qinjuning/article/details/6867806    此人博客寫的不錯，有待研究啊

2。http://blog.csdn.net/liranke/article/details/17717571 簡直就是超級大神！

3。下面來看我們的案例

PackageManager pm = getPackageManager();

下面是獲取當前應用的基本信息：

//圖標

 Drawable app_icon =pm.getApplicationIcon(getApplicationInfo());

// 獲取名稱
  String app_name = (String) pm.getApplicationLabel(getApplicationInfo());

PackageInfopackageInfo = pm.getPackageInfo(getPackageName(), PackageManager.GET_UNINSTALLED_PACKAGES);

mAppInfo.setAppLabel((String) packageInfo.applicationInfo.loadLabel(pm));
   //mAppInfo.setAppIcon(packageInfo.applicationInfo.loadIcon(pm));
   mAppInfo.setVersionName(packageInfo.versionName);
   mAppInfo.setVersionCode(packageInfo.versionCode);
   mAppInfo.setPackageName(packageInfo.packageName);
   mAppInfo.setFirstInstallTime(packageInfo.firstInstallTime);
   mAppInfo.setLastUpdateTime(packageInfo.lastUpdateTime);

下面是獲取手機中應用的基本信息：

List<PackageInfo> installedPackages = pm.getInstalledPackages(0);
  for (PackageInfo packageInfo : installedPackages) {
   AppInfo mAppInfo = new AppInfo();
   mAppInfo.setAppLabel((String) packageInfo.applicationInfo.loadLabel(pm));
   //mAppInfo.setAppIcon(packageInfo.applicationInfo.loadIcon(pm));
   mAppInfo.setVersionName(packageInfo.versionName);
   mAppInfo.setVersionCode(packageInfo.versionCode);
   mAppInfo.setPackageName(packageInfo.packageName);
   mAppInfo.setFirstInstallTime(packageInfo.firstInstallTime);
   mAppInfo.setLastUpdateTime(packageInfo.lastUpdateTime);
   
   // Only display the non-system app info
   if ((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
    // 若是非系統應用，則添加至appList
    mAppInfos.add(mAppInfo);
   }
  }

下面是獲取手機桌面上應用的基本信息：

Intent intent = new Intent(Intent.ACTION_MAIN);
  intent.addCategory(Intent.CATEGORY_LAUNCHER);
        List<ResolveInfo> queryIntentActivities = pm.queryIntentActivities(intent, 0);
        for (ResolveInfo resolveInfo : queryIntentActivities) {
         AppInfo mAppInfo = new AppInfo();
   mAppInfo.setAppIcon(resolveInfo.loadIcon(pm));
   mAppInfo.setAppLabel((String)resolveInfo.loadLabel(pm));
   mAppInfo.setPackageName(resolveInfo.activityInfo.packageName);
   mAppInfos.add(mAppInfo);
  }

效果如圖：

關於apk的安裝路徑和大小：

豌豆莢
10-04 03:38:02.178: I/System.out(2458): sourceDir:/data/app/com.wandoujia.phoenix2-1.apk
10-04 03:38:02.178: I/System.out(2458): dataDir:/data/data/com.wandoujia.phoenix2
10-04 03:38:02.178: I/System.out(2458): publicSourceDir:/data/app/com.wandoujia.phoenix2-1.apk
10-04 03:38:02.178: I/System.out(2458): 豌豆莢的apk大小：5.13MB

API Demos
10-04 03:38:02.002: I/System.out(2458): sourceDir:/data/app/com.example.android.apis-1.apk
10-04 03:38:02.006: I/System.out(2458): dataDir:/data/data/com.example.android.apis
10-04 03:38:02.006: I/System.out(2458): publicSourceDir:/data/app/com.example.android.apis-1.apk
10-04 03:38:02.026: I/System.out(2458): API Demos的apk大小：4.58MB

電話
10-04 03:38:01.802: I/System.out(2458): sourceDir:/system/app/VoiceDialer.apk
10-04 03:38:01.802: I/System.out(2458): dataDir:/data/data/com.android.voicedialer
10-04 03:38:01.802: I/System.out(2458): publicSourceDir:/system/app/VoiceDialer.apk
10-04 03:38:01.810: I/System.out(2458): Voice Dialerapk的大小：124KB

鬧鐘
10-04 03:38:02.202: I/System.out(2458): sourceDir:/system/app/DeskClock.apk
10-04 03:38:02.202: I/System.out(2458): dataDir:/data/data/com.android.deskclock
10-04 03:38:02.202: I/System.out(2458): publicSourceDir:/system/app/DeskClock.apk
10-04 03:38:02.202: I/System.out(2458): Clockapk大小：2.14MB

代碼實現：
List<ApplicationInfo> installedApplications = pm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
  for (ApplicationInfo applicationInfo : installedApplications) {
   String sourceDir=applicationInfo.sourceDir;//安裝路徑
   String dataDir=applicationInfo.dataDir;
   String publicSourceDir=applicationInfo.publicSourceDir;
   System.out.println("sourceDir:"+sourceDir);
   System.out.println("dataDir:"+dataDir);
   System.out.println("publicSourceDir:"+publicSourceDir);
   int size = Integer.valueOf((int) new File(publicSourceDir).length());
   System.out.println(applicationInfo.loadLabel(pm)+"的apk大小："+Formatter.formatFileSize(this, size));
  }

這個大小和茄子快傳，快牙，閃傳，豌豆莢上的軟件管理中顯示的是一致的

 

應用程序的大小：

豌豆莢
10-04 03:58:18.234: I/System.out(2538): cacheSize:28.00KB,codeSize:11.11MB,dataSize:8.96MB
10-04 03:58:18.238: I/System.out(2538): externalCacheSize:0.00B,externalCodeSize:0.00B,externalDataSize:0.00BexternalMediaSize:0.00B,externalObbSize:0.00B
10-04 03:58:18.238: I/System.out(2538): 豌豆莢的總大小：20.10MB

API Demos
10-04 03:58:18.122: I/System.out(2538): cacheSize:12.00KB,codeSize:6.43MB,dataSize:0.00B
10-04 03:58:18.122: I/System.out(2538): externalCacheSize:0.00B,externalCodeSize:0.00B,externalDataSize:0.00BexternalMediaSize:0.00B,externalObbSize:0.00B
10-04 03:58:18.122: I/System.out(2538): API Demos的總大小：6.44MB

電話
10-04 03:58:18.310: I/System.out(2538): cacheSize:12.00KB,codeSize:60.00KB,dataSize:12.00KB
10-04 03:58:18.310: I/System.out(2538): externalCacheSize:0.00B,externalCodeSize:0.00B,externalDataSize:0.00BexternalMediaSize:0.00B,externalObbSize:0.00B
10-04 03:58:18.310: I/System.out(2538): Voice Dialer的總大小：84.00KB

鬧鐘
10-04 03:58:17.818: I/System.out(2538): cacheSize:12.00KB,codeSize:392KB,dataSize:60.00KB
10-04 03:58:17.862: I/System.out(2538): externalCacheSize:0.00B,externalCodeSize:0.00B,externalDataSize:0.00BexternalMediaSize:0.00B,externalObbSize:0.00B
10-04 03:58:17.866: I/System.out(2538): Clock的總大小：464KB

目錄結構以下：

介紹一篇aidl的文章：http://www.cnblogs.com/rookietong/archive/2013/03/16/2962623.html

android.content.pm，這個包及包下的全部東西都是死的，是系統的aidl文件，這些文件能夠在github上下載。

IPackageDataObserver.aidl：

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);
}

IPackageStatsObserver.aidl：

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：
package android.content.pm;

parcelable  PackageStats;

軟件包的大小封裝在PackageStats這個類中，要獲取這個類不能用構造方法獲取，這一點也不知道爲何。他是經過PackageManager的hide方法getPackageSizeInfo（）來獲得，可是要調用這個hide方法就要用java的反射機制，否則pm.不出來。應用aidl的代碼以下：

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

for (final ResolveInfo resolveInfo : queryIntentActivities) {
   try {
    Method getPackageSizeInfo = pm.getClass().getMethod("getPackageSizeInfo", String.class, IPackageStatsObserver.class);
    getPackageSizeInfo.invoke(pm, resolveInfo.activityInfo.packageName, new IPackageStatsObserver.Stub() {
     @Override
     public void onGetStatsCompleted(PackageStats packageStats, boolean succeeded) throws RemoteException {
      // TODO Auto-generated method stub
      Long cacheSize=packageStats.cacheSize;
      Long codeSize=packageStats.codeSize;
      Long dataSize=packageStats.dataSize;
      Long externalCacheSize=packageStats.externalCacheSize;
      Long externalCodeSize=packageStats.externalCodeSize;
      Long externalDataSize=packageStats.externalDataSize;
      Long externalMediaSize=packageStats.externalMediaSize;
      Long externalObbSize=packageStats.externalObbSize;
      System.out.println("cacheSize:" + Formatter.formatFileSize(getApplication(), cacheSize) + ",codeSize:" + Formatter.formatFileSize(getApplication(), codeSize) + ",dataSize:" + Formatter.formatFileSize(getApplication(), dataSize));
      System.out.println("externalCacheSize:" + Formatter.formatFileSize(getApplication(), externalCacheSize) + ",externalCodeSize:" + Formatter.formatFileSize(getApplication(), externalCodeSize) + ",externalDataSize:" + Formatter.formatFileSize(getApplication(), externalDataSize)+
        "externalMediaSize:"+Formatter.formatFileSize(getApplication(), externalMediaSize) + ",externalObbSize:" + Formatter.formatFileSize(getApplication(), externalObbSize) );
     String totalSize=Formatter.formatFileSize(getApplication(), (packageStats.cacheSize + packageStats.codeSize +packageStats.dataSize)/*/(1024*1024)*/);
     System.out.println((String) resolveInfo.loadLabel(pm)+"的總大小：" + totalSize /*+"M"*/);
     }
    });
   } catch (Exception e) {
    // TODO: handle exception
    e.printStackTrace();
   }

這個大小是和獵豹清理大師軟件管理中的大小是一致的

點擊item啓動應用程序：

啓動另外的一個應用程序的Activity：

http://www.apkbus.com/android-43480-1-1.html

http://gundumw100.iteye.com/blog/1138158  （其中這個比較好）

代碼實現：

lv.setAdapter(adapter);  

       lv.setOnItemClickListener(new OnItemClickListener() {  

            @Override  

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

                String packageName = (String) items.get(position).get( "packageName");  

                //取到點擊的包名  

                Intent i = pm.getLaunchIntentForPackage(packageName);  

                //若是該程序不可啓動（像系統自帶的包，有不少是沒有入口的）會返回NULL  

                if (i != null)  

                    startActivity(i);  

            }  

        });