获取android手机里的所有应用，点击并响应

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
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"
/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center" >

<ImageView
android:id="@+id/apps_image"
android:layout_width="48dip"
android:layout_height="48dip"
android:icon="@drawable/icon" />

<TextView
android:id="@+id/apps_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxLines="1"
android:maxEms="5"
android:text="good" />

</LinearLayout>

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<AppsItemInfo> 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<PackageInfo> appList = getAllApps(Apps.this);

list = new ArrayList<AppsItemInfo>();

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<PackageInfo> getAllApps(Context context) {

List<PackageInfo> apps = new ArrayList<PackageInfo>();
PackageManager pManager = context.getPackageManager();
// 获取手机内所有应用
List<PackageInfo> 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;
}

}

}