第三章:任务管理器正在运行的程序

效果:







mian.xnl

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget0"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="&#21462;&#24471;&#31995;&#32479;&#27491;&#22312;&#36816;&#34892;&#30340;&#31243;&#24207;"
android:layout_x="78px"
android:layout_y="370px"
>
</Button>
<TextView
android:id="@+id/texts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="&#21462;&#24471;&#31995;&#32479;&#27491;&#22312;&#36816;&#34892;&#30340;&#31243;&#24207;"
android:layout_x="11px"
android:layout_y="10px"
>
</TextView>
<ListView
android:id="@+id/show"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="11px"
android:layout_y="37px"
>
</ListView>
</AbsoluteLayout>

simple_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/widget0"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
</TextView>
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="runing.task.info.test"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".RuningTaskInfoTest"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

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

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, RuningTaskInfoTest!</string>
    <string name="app_name">RuningTaskInfoTest</string>
    <string name="nulls">没有任务运行！</string>
    <string name="permission">没有权限！</string>
</resources>

package runing.task.info.test;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.ActivityManager;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class RuningTaskInfoTest extends Activity {
	private Button mButton1;
	private ListView mListView01;
	private ArrayAdapter<String> aryAdapter1;
	private ArrayList<String> arylistTask;
	private int inGetTastCounter=30;
	private ActivityManager mActivityManager;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /** 载入main.xml*/
        setContentView(R.layout.main);
        /**通过id找到Button组件*/
        mButton1=(Button)findViewById(R.id.button);
        mListView01=(ListView)findViewById(R.id.show);
        /**设置按钮点击事件*/
        mButton1.setOnClickListener(new Button.OnClickListener(){
			@Override
			public void onClick(View v) {
				try{
					/** ActivityManager 对象向系统取得ACTIVITY_SERVICE*/
					mActivityManager=(ActivityManager)RuningTaskInfoTest.this.getSystemService(ACTIVITY_SERVICE);
					arylistTask=new ArrayList<String>();
					/** 以getRunningTasks方法取得任务名称与ID*/
					List<ActivityManager.RunningTaskInfo> mRunningTasks=mActivityManager.getRunningTasks(inGetTastCounter);
					int i=1;
					for(ActivityManager.RunningTaskInfo amTask:mRunningTasks){
						/** 将取得的任务名字添加到list集合里*/
						arylistTask.add(""+(i++)+":"+amTask.baseActivity.getClassName()+"(ID"+amTask.id+")");
					}
					
					aryAdapter1=new ArrayAdapter<String>(RuningTaskInfoTest.this,  R.layout.simple_list_item, R.id.text, arylistTask);
					if(aryAdapter1.getCount()==0){
						/**当没有任何任务运行,则提示细信息*/
						mMakeTextToast(getResources().getText(R.string.nulls).toString(),true);
					}else{
						/**将后台运行的信息以ListView条列呈现*/
						mListView01.setAdapter(aryAdapter1);
					}
				}catch (SecurityException e) {
					e.printStackTrace();
					/**当无GET_TASKS权限时提示信息*/
					mMakeTextToast(getResources().getText(R.string.permission).toString(),true);
				}
			}
        });
        /**当User在运行任务选择的事件处理*/
        mListView01.setOnItemSelectedListener(new ListView.OnItemSelectedListener(){
			@Override
			public void onItemSelected(AdapterView<?> arg0, View arg1,
					int arg2, long arg3) {
				/**由于将运行任务以数组的方式存放,以ID取出数组元素名*/
				mMakeTextToast(arylistTask.get(arg2).toString(),false);
			}

			@Override
			public void onNothingSelected(AdapterView<?> arg0) {
				// TODO Auto-generated method stub
				
			}
        });
        /**当User在运行任务单击的事件处理*/
        mListView01.setOnItemClickListener(new ListView.OnItemClickListener(){
			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				/**由于将运行任务以数组的方式存放,以ID取出数组元素名*/
				mMakeTextToast(arylistTask.get(arg2).toString(),false);
			}
        	
        });
    }
    public void mMakeTextToast(String str,boolean isLong){
    	if(isLong==true){
    		Toast.makeText(RuningTaskInfoTest.this, str, Toast.LENGTH_LONG).show();
    	}else{
    		Toast.makeText(RuningTaskInfoTest.this, str, Toast.LENGTH_SHORT).show();
    	}
    }
}