在此我写一个找到android手机里的所有已装应用程序(android手机自带的也行)，点击某个应用时，将做出响应 。

先看一下效果图：

当点击《愤怒的小鸟》时，将打开《愤怒的小鸟》这个游戏

main.xml的源代码如下：

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

android:id="@+id/gridview"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:numColumns="auto_fit"

android:verticalSpacing="15dp"

android:horizontalSpacing="12dp"

android:columnWidth="95dp"

android:stretchMode="columnWidth"

android:gravity="center"

/>

接着是apps.xml,源代码如下：

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:gravity="center" >

android:id="@+id/apps_image"

android:layout_width="48dip"

android:layout_height="48dip"

android:icon="@drawable/icon" />

android:id="@+id/apps_textview"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:maxLines="1"

android:maxEms="5"

android:text="good" />

接下来就是java源代码了，比较长，希望耐心看下去

package com.android.getApps;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

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.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.TextView;

public class Apps extends Activity {

// 用来记录应用程序的信息

List list;

private GridView gridview;

private PackageManager pManager;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

this.setContentView(R.layout.main);

// 取得gridview

gridview = (GridView) findViewById(R.id.gridview);

// 获取图片、应用名、包名

pManager = Apps.this.getPackageManager();

List appList = getAllApps(Apps.this);

list = new ArrayList();

for (int i = 0; i < appList.size(); i++) {

PackageInfo pinfo = appList.get(i);

AppsItemInfo shareItem = new AppsItemInfo();

// 设置图片

shareItem.setIcon(pManager

.getApplicationIcon(pinfo.applicationInfo));

// 设置应用程序名字

shareItem.setLabel(pManager.getApplicationLabel(

pinfo.applicationInfo).toString());

// 设置应用程序的包名

shareItem.setPackageName(pinfo.applicationInfo.packageName);

list.add(shareItem);

}

// 设置gridview的Adapter

gridview.setAdapter(new baseAdapter());

// 点击应用图标时，做出响应

gridview.setOnItemClickListener(new ClickListener());

}

public static List getAllApps(Context context) {

List apps = new ArrayList();

PackageManager pManager = context.getPackageManager();

// 获取手机内所有应用

List packlist = pManager.getInstalledPackages(0);

for (int i = 0; i < packlist.size(); i++) {

PackageInfo pak = (PackageInfo) packlist.get(i);

// 判断是否为非系统预装的应用程序

// 这里还可以添加系统自带的，这里就先不添加了，如果有需要可以自己添加

// if()里的值如果<=0则为自己装的程序，否则为系统工程自带

if ((pak.applicationInfo.flags & pak.applicationInfo.FLAG_SYSTEM) <= 0) {

// 添加自己已经安装的应用程序

apps.add(pak);

}

}

return apps;

}

private class baseAdapter extends BaseAdapter {

LayoutInflater inflater = LayoutInflater.from(Apps.this);

@Override

public int getCount() {

// TODO Auto-generated method stub

return list.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 position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

// TODO Auto-generated method stub

ViewHolder holder;

if (convertView == null) {

// 使用View的对象itemView与R.layout.item关联

convertView = inflater.inflate(R.layout.apps, null);

holder = new ViewHolder();

holder.icon = (ImageView) convertView

.findViewById(R.id.apps_image);

holder.label = (TextView) convertView

.findViewById(R.id.apps_textview);

convertView.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

holder.icon.setImageDrawable(list.get(position).getIcon());

holder.label.setText(list.get(position).getLabel().toString());

return convertView;

}

}

private class ViewHolder{

private ImageView icon;

private TextView label;

}

// 当用户点击应用程序图标时，将对这个类做出响应

private class ClickListener implements OnItemClickListener {

@Override

public void onItemClick(AdapterView> arg0, View arg1, int arg2,

long arg3) {

将应用所选的应用程序信息共享到Application中

//MyApp appState = ((MyApp) getApplicationContext());

获取当前所在选项卡

//String tab_id = appState.getTab_id();

设置所选应用程序信息

//appState.set_AppInfo(tab_id, list.get(arg2).getLabel(), list.get(

//arg2).getIcon(), list.get(arg2).getPackageName());

Intent intent = new Intent();

intent = Apps.this.getPackageManager().getLaunchIntentForPackage(list.get(arg2).getPackageName());

startActivity(intent);

// 销毁当前Activity

//finish();

}

}

// 自定义一个 AppsItemInfo 类，用来存储应用程序的相关信息

private class AppsItemInfo {

private Drawable icon; // 存放图片

private String label; // 存放应用程序名

private String packageName; // 存放应用程序包名

public Drawable getIcon() {

return icon;

}

public void setIcon(Drawable icon) {

this.icon = icon;

}

public String getLabel() {

return label;

}

public void setLabel(String label) {

this.label = label;

}

public String getPackageName() {

return packageName;

}

public void setPackageName(String packageName) {

this.packageName = packageName;

}

}

}

在此就写完了，写得不好的地方，请高手不吝赐教

应用程序包: