Android 获得所有应用程序包

本文转载自：http://blog.sina.com.cn/s/blog_3e333c4a01015v3e.html

推荐方法
1、全部程序包
    private void queryFilterAppInfo() {  
        PackageManager pm = this.getPackageManager();  
        // 查询所有已经安装的应用程序  
        List<ApplicationInfo> listAppcations = pm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);// GET_UNINSTALLED_PACKAGES代表已删除，但还有安装目录的
            for (ApplicationInfo app : listAppcations) {  
            AppInfo appInfo = new AppInfo();  
            appInfo.setAppLabel((String) app.loadLabel(pm));  
            appInfo.setAppIcon(app.loadIcon(pm));  
            appInfo.setPkgName(app.packageName);
            mlistAppInfo.add(appInfo);   
        }       
    }
   
2、 获得所有系统的
    public void querySysAppInfo() {  
        PackageManager pm = this.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN, null);  
        intent.addCategory(Intent.CATEGORY_LAUNCHER);  
        // 通过查询，获得所有ResolveInfo对象.  
        List<ResolveInfo> resolveInfos = pm.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);  
         
        for (ResolveInfo reInfo : resolveInfos) {  
        String activityName = reInfo.activityInfo.name; // 获得该应用程序的启动Activity的name  
        String pkgName = reInfo.activityInfo.packageName; // 获得应用程序的包名  
        String appLabel = (String) reInfo.loadLabel(pm); // 获得应用程序的Label  
        Drawable icon = reInfo.loadIcon(pm); // 获得应用程序图标  
        System.out.println(appLabel + " activityName---" + activityName + " pkgName---" + pkgName);  
        }    
    } 


3、 最简单的方法   
    public  boolean appIsInstalled(String packageName){
        try {
            PackageManager pm = this.getPackageManager();
            pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
            System.out.println("已安装"+packageName);
        } catch (NameNotFoundException e) {
            System.out.println("没有安装"+packageName);
            return false;
        }
        return true;
    }


4、获得所有包信息   
    public void getInstallPackage() {
        PackageManager packageManager = this.getPackageManager();
        List<PackageInfo> packageInfoList=packageManager.getInstalledPackages(0);
        mlistAppInfo.clear();  
        for (int i=0;i<packageInfoList.size();i++) { 
            PackageInfo pi = packageInfoList.get(i);
            System.out.println((i+1)+":"+pi.toString());
        }  
    }
5、直接启动方法
    public  void srartApp(String packageName){
        Intent intent = this.getPackageManager().getLaunchIntentForPackage(packageName);
        if(intent!=null)
        startActivity(intent); //已安装包 直接启动
    }