android实现获取正在运行的应用程序

package andorid.tasks; 
import java.io.File; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import android.app.Activity; 
import android.app.ActivityManager; 
import android.app.ActivityManager.RunningAppProcessInfo; 
import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.DialogInterface.OnClickListener; 
import android.content.Intent; 
import android.content.pm.ApplicationInfo; 
import android.content.pm.PackageManager; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemLongClickListener; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.SimpleAdapter.ViewBinder; 
public class ManagerTasksActivity extends Activity { 
private ListView listView; 
private PackageManager pm; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.task_main); 
pm= this.getPackageManager();//获得包管理器 
listView=(ListView)findViewById(R.id.list_view); 
LoadList(this);//加载listview 
} 
private void LoadList(Context context) 
{ 
ArrayList<HashMap<String, Object>> list=new ArrayList<HashMap<String, Object>>(); 
try{ 
ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE); //获得ActivityManager对象 
List<RunningAppProcessInfo> runningTasks = am.getRunningAppProcesses(); //获得所有正在进行的程序存放在一个list中 
for(int i=0;i<runningTasks.size();i++) 
{ 
PackageInfo pInfo=new PackageInfo(context);//获得PackageInfo对象 
//get application which is not in system and the usually 
//如果是非系统应用程序以及一些常用的应用程序就加到list中 
if((pInfo.getInfo(runningTasks.get(i).processName).flags&pInfo.getInfo(runningTasks.get(i).processName).FLAG_SYSTEM)==0 
||(runningTasks.get(i).processName).equals("com.android.contacts") 
||(runningTasks.get(i).processName).equals("com.android.email") 
||(runningTasks.get(i).processName).equals("com.android.settings") 
||(runningTasks.get(i).processName).equals("com.android.music") 
||(runningTasks.get(i).processName).equals("com.android.calendar") 
||(runningTasks.get(i).processName).equals("com.android.calculator2") 
||(runningTasks.get(i).processName).equals("com.android.browser") 
||(runningTasks.get(i).processName).equals("com.android.camera") 
||(runningTasks.get(i).processName).equals("com.cooliris.media") 
||(runningTasks.get(i).processName).equals("com.android.bluetooth") 
||(runningTasks.get(i).processName).equals("com.android.mms")) 
{ 
String dir = pInfo.getInfo(runningTasks.get(i).processName).publicSourceDir; 
Float size=Float.valueOf((float) ((new File(dir).length()*1.0)));//获得应用程序的大小如果size大于一M就用M为单位，否则用KB 
//long date = new Date(new File(dir).lastModified()).getTime(); 
//System.out.println(pInfo.getInfo(runningTasks.get(i).processName).loadIcon(pm)); 
HashMap<String, Object> map=new HashMap<String, Object>(); 
map.put("icon", pInfo.getInfo(runningTasks.get(i).processName).loadIcon(pm)); 
map.put("name", pInfo.getInfo(runningTasks.get(i).processName).loadLabel(pm)); 
if(size>1024*1024) 
map.put("info", size/1024/1024+" MB"); 
else 
map.put("info", size/1024+" KB"); 
map.put("packagename", runningTasks.get(i).processName.toString());//获得包名给后面用 
list.add(map); 
} 
} 
}catch(Exception ex) 
{} 
SimpleAdapter listadapter=new SimpleAdapter(this, list, R.layout.task_list, new String[]{"icon","name","info"}, new int []{R.id.icon,R.id.name,R.id.info}); 
listView.setAdapter(listadapter);//listview加载识别器 
//下面这个方法主要是用来刷新图片，因为pInfo.getInfo(runningTasks.get(i).processName).loadIcon(pm)获得图片不能被显示出 
listadapter.setViewBinder(new ViewBinder(){ 
public boolean setViewValue(View view,Object data,String textRepresentation){ 
if(view instanceof ImageView && data instanceof Drawable){ 
ImageView iv=(ImageView)view; 
iv.setImageDrawable((Drawable)data); 
return true; 
} 
else 
return false; 
} 
}); 
//为listView添加item的点击事件 
listView.setOnItemClickListener(new OnItemClickListener() { 
@Override 
public void onItemClick(AdapterView<?> parent, View view, int position, 
long id) { 
//get the item of the list to a hashmap 
HashMap<?, ?> map=(HashMap<?, ?>)parent.getItemAtPosition(position); 
//get package name from map 
String packageName=(String) map.get("packagename");//从前面的map中获得包名 
//if we onclick the item then start the application 
//根据包名打开应用程序 
Intent intent=new Intent(); 
intent =pm.getLaunchIntentForPackage(packageName); 
startActivity(intent); 
finish();//打开应用程序之后注销本应用程序 
} 
}); 
//为listview的item添加长按事件 
listView.setOnItemLongClickListener(new OnItemLongClickListener() { 
@Override 
public boolean onItemLongClick(AdapterView<?> parent, View view, 
int position, long id) { 
final HashMap<?, ?> long_map=(HashMap<?, ?>)parent.getItemAtPosition(position); 
new AlertDialog.Builder(ManagerTasksActivity.this).setTitle("Are you sure close") 
.setPositiveButton("sure", new OnClickListener() { 
@Override 
public void onClick(DialogInterface dialog, int which) { 
ActivityManager am = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE); 
String packageName=(String)long_map.get("packagename"); 
//base packagename to kill appliction 
//根据包名杀死应用程序 
am.killBackgroundProcesses(packageName); 
//refash list 
//刷新listview 
LoadList(ManagerTasksActivity.this); 
} 
}).setNegativeButton("cancle", new OnClickListener() { 
@Override 
public void onClick(DialogInterface dialog, int which) { 
} 
}).show(); 
return false; 
} 
}); 
} 
} 
//类PackageInfo主要包括ApplicationInfo getInfo(String name)方法 
class PackageInfo { 
private List<ApplicationInfo> appList; 
public PackageInfo(Context context){ 
//get all package data 
PackageManager pm = context.getApplicationContext().getPackageManager(); 
appList = pm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES); 
} 
public ApplicationInfo getInfo(String name){ 
if(name == null){ 
return null; 
} 
for(ApplicationInfo appInfo : appList){ 
if(name.equals(appInfo.processName)){ 
return appInfo; 
} 
} 
return null; 
} 
} 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:orientation="horizontal" 
> 
<ImageView 
android:id="@+id/icon" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
/> 
<TextView 
android:layout_width="40dip" 
android:layout_height="40dip" 
/> 
<LinearLayout 
android:orientation="vertical" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
> 
<TextView 
android:id="@+id/name" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:textStyle="bold" 
/> 
<TextView 
android:id="@+id/info" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
/> 
</LinearLayout> 
</LinearLayout> 

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

<uses-permission android:name="android.permission.RESTART_PACKAGES" />