在main.xml中：
<?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:background="#3399ff">
<ListView
android:id="@+id/tasklist"
android:layout_gravity="center_horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
在MyActivityRun.java中：
package com.li.activityrun;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
public class MyActivityRun extends Activity {
private ListView tasklist = null ;
private ListAdapter adapter = null ;
private List<String> all = new ArrayList<String>() ;
private ActivityManager activityManager = null ;
private List<ActivityManager.RunningTaskInfo> allTaskInfo ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.tasklist = (ListView) super.findViewById(R.id.tasklist) ;
this.activityManager = (ActivityManager) super
.getSystemService(Context.ACTIVITY_SERVICE);
this.listActivity() ;
}
private void listActivity() {
this.allTaskInfo = this.activityManager.getRunningTasks(30); // 返回30条
Iterator<ActivityManager.RunningTaskInfo> iterInfo = this.allTaskInfo.iterator() ;
while(iterInfo.hasNext()) {
ActivityManager.RunningTaskInfo task = iterInfo.next() ;
this.all.add("【ID = " + task.id + " 】 "
+ task.baseActivity.getClassName());
}
this.adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, this.all);
this.tasklist.setAdapter(this.adapter) ;
}
}
在AndroidManifest.xml中修改权限：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.li.activityrun"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.GET_TASKS"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MyActivityRun"
android:label="@string/title_activity_my_activity_run" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>