在android中实现一个像桌面那样把所有应用都列举出来。用GridView来实现显示。
主要代码如下：
先修改main.xml文件：
然后创建一个xml文件来显示你想在GridView中显示的格式，我这边是用一个图标加一个文件来显示的。
application.xml
接下来是主要代码的实现了。 package com.mzz;
import java.util.Collections;
import java.util.List;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
public class ListApplications extends Activity implements OnItemClickListener{ private GridView mGridView = null ;
private PackageManager mPackageManager = null ;
private List mAllApps = null ;
/** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.main);
showView();
} public void showView() { mPackageManager = getPackageManager();
mGridView = (GridView)findViewById(R.id.gridView);
getAllApps();
mGridView.setAdapter(new MyAdapter(ListApplications.this , mAllApps));
mGridView.setNumColumns(3);
//每行显示3个 mGridView.setOnItemClickListener(this);
} public void getAllApps() { //设置一个Intent的action和category为需要显示 Intent intent = new Intent(Intent.ACTION_MAIN , null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
//如何条件的查出来 mAllApps = mPackageManager.queryIntentActivities(intent, 0);
//排序 Collections.sort(mAllApps, new ResolveInfo.DisplayNameComparator(mPackageManager));
} //当点击gridview中的图标时，进入相应的应用 @Override public void onItemClick(AdapterView parent, View view, int position, long id) { // TODO Auto-generated method stub ResolveInfo res = mAllApps.get(position);
//得到该应用的包名和activity String pkg = res.activityInfo.packageName ;
String cls = res.activityInfo.name ;
ComponentName mComponentName = new ComponentName(pkg, cls);
Intent intent = new Intent();
intent.setComponent(mComponentName);
startActivity(intent);
} //Adapter class MyAdapter extends BaseAdapter { private Context mContext ;
private List mAllApps ;
MyAdapter(Context context , List allApps) { mContext = context ;
mAllApps = allApps ;
} @Override public int getCount() { // TODO Auto-generated method stub return mAllApps.size();
} @Override public Object getItem(int position) { // TODO Auto-generated method stub return null;
} @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0;
} @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub convertView = LayoutInflater.from(mContext).inflate(R.layout.applications, null);
ImageView icon = (ImageView)convertView.findViewById(R.id.icon);
TextView title = (TextView)convertView.findViewById(R.id.title);
ResolveInfo res = mAllApps.get(position);
icon.setImageDrawable(res.loadIcon(mPackageManager));
title.setText(res.loadLabel(mPackageManager));
return convertView;
} } }
到这里代码的全部编写完成了。
效果如下图所见:
虽然和本身的显示相比，我的这个有点丑。没有处理图标的大小，不过功能上实现了。当你点击相应的图标的时候，会进入相应的应用的主Activity。
呵呵。。。
【android|android 列出所有的应用】
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