获取android手机里的所有应用，点击并响应

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：

<?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>

接着是apps.xml,源代码如下：

<?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>

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<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;
		}
 
	}
 
}