Get the basic information of the Applications in the system

In this example, we will show how to obtain several basic attribute information of Application: name, Package label, version information and icon information. Create a Class to store basic information:

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");  

     }  

 } 

 
Next is the subject that gets the information:

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;  

 } 

 
Use this method to get the Applications information contained in the system:

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();  

    }  

 } 

 
There is also a relatively simple application that obtains Application information through PackageManager:

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  

 }