获取系统中全部应用的方法

/**
	 * 获取所有应用
	 * @return 所有应用的集合
	 */
	private List<AppInfo> queryAppInfo() {
		mlistAppInfo = new ArrayList<AppInfo>();
		PackageManager pm = this.getPackageManager();
		Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
		mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		List<ResolveInfo> resolveInfos = pm.queryIntentActivities(mainIntent, 0);
		//调用系统排序 ， 根据name排序
		Collections.sort(resolveInfos,new ResolveInfo.DisplayNameComparator(pm));
		
		if (mlistAppInfo != null) {
			mlistAppInfo.clear();
			for(ResolveInfo resolveInfo : resolveInfos) {
				String activityName = resolveInfo.activityInfo.name; // 获得该应用程序的启动Activity的name
				String pkgName = resolveInfo.activityInfo.packageName; // 获得应用程序的包名
				String appLabel = (String)resolveInfo.loadLabel(pm);   //获取应用的名称
				Drawable icon = resolveInfo.loadIcon(pm); //获取应用的图标icon
				Log.i("ii", "========="+activityName+" ====== "+pkgName);
				//为应用程序的启动Activity 准备Intent
				Intent launchIntent = new Intent();
				launchIntent.setComponent(new ComponentName(pkgName,activityName));
				
				// 创建一个AppInfo对象，并赋值
				AppInfo appInfo = new AppInfo();
				appInfo.setAppLabel(appLabel);
				appInfo.setPkgName(pkgName);
				appInfo.setAppIcon(icon);
				appInfo.setIntent(launchIntent);
				mlistAppInfo.add(appInfo); // 添加至列表中
			}
		}
		
		return mlistAppInfo;
	}