只获得安装的APP

只获得安装APP，有两种方法：

public class MainActivity extends Activity {
	private GridView mGridView; 
	private Context mContext; 
	private List<PackageInfo> packages;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		mGridView = (GridView)findViewById(R.id.allapps); 
		mContext = MainActivity.this;
		packages = getPackageManager().getInstalledPackages(0);  //只获取安装的包

		/* 获取安装APP的另一种方法		
		for(int i=0;i<packages.size();i++) {
			PackageInfo packageInfo = packages.get(i);
			if((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM)==0){
				PackageInfo tmpInfo =new PackageInfo();

				tmpInfo.appName = packageInfo.applicationInfo.loadLabel(getPackageManager()).toString(); 
				tmpInfo.packageName = packageInfo.packageName;
				tmpInfo.versionName = packageInfo.versionName;
				tmpInfo.versionCode = packageInfo.versionCode;
				tmpInfo.appIcon = packageInfo.applicationInfo.loadIcon(getPackageManager());
				appList.add(tmpInfo);				
			}
		}*/
			
		
		mGridView.setAdapter(new GridItemAdapter(mContext, packages)); 
		mGridView.setNumColumns(3);

	}
	
	private class GridItemAdapter extends BaseAdapter{ 
		private Context context;
		private List<PackageInfo> resInfo; 
		
		public GridItemAdapter(Context c,List<PackageInfo> res){ 
			context = c;  
			resInfo = res; 
		}
		
		public int getCount() { 
			return resInfo.size(); 
		}
		
		public View getView(int position, View convertView, ViewGroup parent) { 
			convertView = LayoutInflater.from(context).inflate(R.layout.application_layout, null); 
			ImageView app_icon = (ImageView)convertView.findViewById(R.id.app_icon);
			TextView app_tilte = (TextView)convertView.findViewById(R.id.app_title); 
			
			PackageInfo res = resInfo.get(position); 
			app_icon.setImageDrawable(res.applicationInfo.loadIcon(getPackageManager())); 
			app_tilte.setText(res.packageName);  //APP的包的名字
			return convertView;
		}
	}	
}