简单的Launcher

package com.qin.appinfo;

import java.util.ArrayList;
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.IntentFilter;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.Drawable;
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.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity implements OnItemClickListener {

 private ListView listview = null;

 private List<AppInfo> mlistAppInfo = null;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.browse_app_list);

  listview = (ListView) findViewById(R.id.listviewApp);
  mlistAppInfo = new ArrayList<AppInfo>();
  queryAppInfo(); // 查询所有应用程序信息
  BrowseApplicationInfoAdapter browseAppAdapter = new BrowseApplicationInfoAdapter(
    this, mlistAppInfo);
  listview.setAdapter(browseAppAdapter);
  listview.setOnItemClickListener(this);
 }
 // 点击跳转至该应用程序
 public void onItemClick(AdapterView<?> arg0, View view, int position,
   long arg3) {
  // TODO Auto-generated method stub
  Intent intent = mlistAppInfo.get(position).getIntent();
  startActivity(intent);
 }
 // 获得所有启动Activity的信息，类似于Launch界面
 public void queryAppInfo() {
  PackageManager pm = this.getPackageManager(); // 获得PackageManager对象
  Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
  mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
  // 通过查询，获得所有ResolveInfo对象.
  List<ResolveInfo> resolveInfos = pm
    .queryIntentActivities(mainIntent, PackageManager.MATCH_DEFAULT_ONLY);
  // 调用系统排序 ， 根据name排序
  // 该排序很重要，否则只能显示系统应用，而不能列出第三方应用程序
  Collections.sort(resolveInfos,new ResolveInfo.DisplayNameComparator(pm));
  if (mlistAppInfo != null) {
   mlistAppInfo.clear();
   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
    // 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
   }
  }
 }
}