获取系统内Applications的基本信息

在这个例子中将展示如何获取Application的几个基本属性信息：名字、Package标签、版本信息和图标信息。
创建一个用于存储基本信息的Class：

class PInfo {  


     private String appname = "";  

     private String pname = "";  

     private String versionName = "";  

     private int versionCode = 0;  

     private Drawable icon;  

     private void prettyPrint() {  

         log(appname + "t" + pname + "t" + versionName + "t" + versionCode + "t");  

     }  

 } 

 

接下来是获取信息的主体：

private ArrayList < PInfo > getInstalledApps(boolean getSysPackages) {  

    ArrayList < PInfo > res = new ArrayList < PInfo > ();  

     List < PackageInfo > packs = getPackageManager().getInstalledPackages(0);  

     for(int i=0;i < packs.size();i++) {  

         PackageInfo p = packs.get(i);  

         if ((!getSysPackages) && (p.versionName == null)) {  

             continue ;  

         }  

        PInfo newInfo = new PInfo();  

        newInfo.appname = p.applicationInfo.loadLabel(getPackageManager()).toString();  

         newInfo.pname = p.packageName;  

        newInfo.versionName = p.versionName;  

        newInfo.versionCode = p.versionCode;  

        newInfo.icon = p.applicationInfo.loadIcon(getPackageManager());  

         res.add(newInfo);  

     }  

    return res;  

 } 

 

用这个方法来获取系统内所包含的Applications信息：

private void listPackages() {  

    ArrayList < PInfo > apps = getInstalledApps(false); /* false = no system packages */ 

    final int max = apps.size();  

    for (int i=0; i < max; i++) {  

        apps.get(i).prettyPrint();  

    }  

 } 

 

还有一个相对比较简单的应用，借由PackageManager来获取Application信息：

PackageManager manager = this.getPackageManager();  

 try {      

    PackageInfo info = manager.getPackageInfo(this.getPackageName(), 0);  

    String packageName = info.packageName;  

    int versionCode = info.versionCode;  

   String versionName = info.versionName;    
    

 } catch (NameNotFoundException e) {  

    // TODO Auto-generated catch block  

 }