PackageManager()的使用列举相关的事件

看来这个东西应该专门开一个帖子了，发现这个包里面的东西太多，以前写的很零碎不容易找

查询系统使用的Content Providers

for (PackageInfo pack : getPackageManager().getInstalledPackages(PackageManager.GET_PROVIDERS)) { 
        ProviderInfo[] providers = pack.providers; 
        if (providers != null) { 
            for (ProviderInfo provider : providers) { 
                Log.d("Example", "provider: " + provider.authority); 
            } 
        } 
    } 

 

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");   
    }   
}   
  
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();   
    }   
}   
  
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();  

   }  
 } 

 

01 PackageManager manager = this.getPackageManager();  

02 try {    

03    

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

05    String packageName = info.packageName;  

06    int versionCode = info.versionCode;  

07    String versionName = info.versionName;    

08    

09 } catch (NameNotFoundException e) {  

10    // TODO Auto-generated catch block  

11 }