• convertView的疑问(软件管理器)


     1 package com.hixin.appexplorer;
     2 
     3 import java.util.List;
     4 
     5 import android.app.Activity;
     6 import android.content.Context;
     7 import android.content.pm.PackageInfo;
     8 import android.content.pm.PackageManager;
     9 import android.os.Bundle;
    10 import android.view.LayoutInflater;
    11 import android.view.View;
    12 import android.view.ViewGroup;
    13 import android.view.Window;
    14 import android.view.WindowManager;
    15 import android.widget.BaseAdapter;
    16 import android.widget.GridView;
    17 import android.widget.ImageView;
    18 import android.widget.TextView;
    19 
    20 public class MainActivity extends Activity {
    21 
    22     GridView gv;
    23     private List<PackageInfo> packageInfos;
    24     @Override
    25     protected void onCreate(Bundle savedInstanceState) {
    26         super.onCreate(savedInstanceState);
    27         requestWindowFeature(Window.FEATURE_NO_TITLE);
    28         getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    29         setContentView(R.layout.show_app_grid);
    30         init();
    31         gv=(GridView)this.findViewById(R.id.gv_apps);
    32         gv.setAdapter(new GridViewAdapter(this));
    33     
    34         }
    35     private void init(){
    36         packageInfos = getPackageManager().getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);
    37     }
    38     class GridViewAdapter extends BaseAdapter{
    39 
    40         LayoutInflater inflater;
    41         public GridViewAdapter(Context context) {
    42             inflater = LayoutInflater.from(context);
    43         }
    44         @Override
    45         public int getCount() {
    46             // TODO Auto-generated method stub
    47             return packageInfos.size();
    48         }
    49 
    50         @Override
    51         public Object getItem(int position) {
    52             // TODO Auto-generated method stub
    53             return packageInfos.get(position);
    54         }
    55 
    56         @Override
    57         public long getItemId(int position) {
    58             // TODO Auto-generated method stub
    59             return position;
    60         }
    61 
    62         @Override
    63         public View getView(int position, View convertView, ViewGroup parent) {
    64             // TODO Auto-generated method stub
    65         
    66                 View view = inflater.inflate(R.layout.gv_item, null);
    67                 TextView tv = (TextView)view.findViewById(R.id.gv_item_appname);
    68                 ImageView iv = (ImageView)view.findViewById(R.id.gv_item_icon);
    69                 tv.setText(packageInfos.get(position).packageName);
    70                 iv.setImageDrawable(packageInfos.get(position).applicationInfo.loadIcon(getPackageManager()));
    71             
    72             return view;
    73         }
    74         
    75     }
    76 }
    77 
    78     


    其中getView函数没有用到,程序运行并没有问题

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  • 原文地址:https://www.cnblogs.com/hixin/p/4121734.html
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