使用ActivityManager实现进程管理

Android中使用ActivityManager可以获得进程信息，并对进程进行管理，如结束进程等。本文使用ActivityManager获得进程列表，并结束选中的进程。 

首先，看看布局文件。

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

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:layout_weight="5" >

        <TextView
            android:id="@+id/textView1"
            style="@style/my_style"
            android:layout_width="match_parent"
            android:layout_height="fill_parent"
            android:layout_weight="3" />

        <TextView
            android:id="@+id/textView2"
            style="@style/my_style"
            android:layout_width="match_parent"
            android:layout_height="fill_parent"
            android:layout_gravity="center_vertical|center_horizontal"
            android:layout_weight="3"
            android:gravity="center_vertical|center_horizontal"
            android:text="进程号" />

        <TextView
            android:id="@+id/textView3"
            style="@style/my_style"
            android:layout_width="match_parent"
            android:layout_height="fill_parent"
            android:layout_weight="2"
            android:gravity="center_vertical|center_horizontal"
            android:text="进程名" />
        
		<TextView
            android:id="@+id/textView4"
            style="@style/my_style"
            android:layout_width="match_parent"
            android:layout_height="fill_parent"
            android:layout_weight="3"
            android:gravity="center_vertical|center_horizontal"
            android:text="内存" />

    </LinearLayout>
    
    <ListView
        android:id="@id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:layout_weight="1" >

    </ListView>

    <Button
        android:id="@+id/btn_pro"
        style="@style/my_style"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:layout_weight="5"
        android:text="结束" />

</LinearLayout>

然后是Java文件。

package com.hzhi.sysinfor;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.ActivityManager;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Debug;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class process extends ListActivity{
	
	Button btn_stop;
	PackageManager pkg_man;
	list_pro list_ada;
	ActivityManager am;
	
	// 获得所有的进程列表
	public void get_pro(){ 
		
		list_ada = new list_pro(this);
        
		// 包管理器
		am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
		// 获取手机内所有应用
		List<ActivityManager.RunningAppProcessInfo> pi = am.getRunningAppProcesses(); 
		
		for (int i=0; i<pi.size(); i++){
			
			ActivityManager.RunningAppProcessInfo pii = 
					(ActivityManager.RunningAppProcessInfo) pi.get(i);
			
			int[] mem = new int[] {pii.pid};
			Debug.MemoryInfo[] mi = am.getProcessMemoryInfo(mem); 
			
			list_ada.addItem(String.valueOf(pii.pid),
					pii.processName, 
					String.valueOf(mi[0].dalvikPrivateDirty) + "KB",
					false);			
			
		}
        
        setListAdapter(list_ada);
        
	}
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_list_process);
		
		get_pro();

        
        btn_stop = (Button) findViewById(R.id.btn_pro);
        btn_stop.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {

				for (int j=0; j<list_ada.list_data.size(); j++){
					
					// 该应用需要删除
					if (list_ada.list_data.get(j).is_chk){						
						
						String name = (String) 
								list_ada.list_data.get(j).txt_name.getText();
						final String pro = (String) 
								list_ada.list_data.get(j).txt_name.getText();
						
						new AlertDialog.Builder(process.this)
						.setTitle("结束进程")
						.setMessage("确定结束" + name + "吗?")
						.setPositiveButton("是", new DialogInterface.OnClickListener() {

							@Override
							public void onClick(DialogInterface arg0, int arg1) {
								unload(pro);
								get_pro();
							}

						})
						.setNegativeButton("否", null)
						.show();
					}
					
				}
				
			}
		});

	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	public boolean unload (String n){
		
		boolean res = true;
		
		am.killBackgroundProcesses(n);
		Toast.makeText(process.this, "进程" + n + "已经结束!", Toast.LENGTH_LONG)
		.show();
		
		return res;
		
	}

}

// pro列表
class list_pro extends BaseAdapter implements OnClickListener{
  
	public Context ctx;
	public List<item_pro> list_data;
  
	public list_pro(Context context){
      
		ctx = context;
		list_data = new ArrayList<item_pro>();
      
	}

	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return list_data.size();
	}

	@Override
	public Object getItem(int arg0) {
     // TODO Auto-generated method stub
     return list_data.get(arg0);
	}

	@Override
	public long getItemId(int arg0) {
     // TODO Auto-generated method stub
     return list_data.indexOf(arg0);
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {

		item_pro my_item; 
		Integer i = 0;
      
		if (convertView == null) 
		{  
			my_item = new item_pro(ctx,
                 (String)list_data.get(position).txt_no.getText(),
                 (String)list_data.get(position).txt_name.getText(),
                 (String)list_data.get(position).txt_size.getText(),
                 list_data.get(position).is_chk); 
		}
		else
		{  
			my_item = (item_pro)convertView;  
			my_item.txt_no.setText(list_data.get(position).txt_no.getText());
			my_item.txt_name.setText(list_data.get(position).txt_name.getText());
			my_item.txt_size.setText(list_data.get(position).txt_size.getText());
		}
		
		CheckBox chk_item = (CheckBox) my_item.chk_pro;
		chk_item.setOnClickListener(this);	
		chk_item.setChecked(list_data.get(position).is_chk);
		chk_item.setTag(position);

		return my_item; 
  
	}
  
	public void addItem(String txt_no, String txt_name, 
			String str_size, Boolean bol_chk)
	{  
		list_data.add(new item_pro(ctx,txt_no,txt_name,str_size,bol_chk));                 
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		CheckBox c = (CheckBox) v;
		int pos = Integer.parseInt(v.getTag().toString());
		list_data.get(pos).is_chk = c.isChecked();		
	}
  
}

// pro列表的一行
class item_pro extends LinearLayout{
	
	public CheckBox chk_pro;
	// 进程号
	public TextView txt_no;
	// 进程名
	public TextView txt_name; 
	// 占用内存大小
	public TextView txt_size;
	// 是否选中
	public boolean is_chk;
	 
	public item_pro(Context ctx, String str_no, String str_name, 
			String str_size, Boolean bol_chk)
	{		 
		super(ctx);
		this.setOrientation(HORIZONTAL);		
		
		int hei = 80;
		
		chk_pro = new CheckBox(ctx);
		addView(chk_pro,
				new LinearLayout.LayoutParams((int)(MainActivity.wid_scr*0.2),hei));		
		 
		txt_no = new TextView(ctx);
		txt_no.setText(str_no);
		addView(txt_no,
				new LinearLayout.LayoutParams((int)(MainActivity.wid_scr*0.2),hei));
		
		txt_name = new TextView(ctx);
		txt_name.setText(str_name);
		addView(txt_name,
				new LinearLayout.LayoutParams((int)(MainActivity.wid_scr*0.4),hei));
		
		txt_size = new TextView(ctx);
		txt_size.setText(str_size);
		addView(txt_size,
				new LinearLayout.LayoutParams((int)(MainActivity.wid_scr*0.2),hei));

		is_chk = bol_chk;
		 
	 }

}

Java文件实现了三个类。process类是整个Activity的类，list_pro是适配器类，item_pro是列表里面的一行。
在process类的get_pro()方法里面，语句am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE)获得了一个ActivityManager，List<ActivityManager.RunningAppProcessInfo> pi = am.getRunningAppProcesses()获得了系统的所有进程，并存储在列表pi里面。语句ActivityManager.RunningAppProcessInfo pii = (ActivityManager.RunningAppProcessInfo) pi.get(i)获得了每一个进程信息，pii.processName是该进程的进程名（通常是该进程对应的包名），mi[0].dalvikPrivateDirty是该进程占用的内存大小（通常以KB为单位）。在unload (String n)方法里面，am.killBackgroundProcesses(n)结束了进程名为n的进程，不过要在AndroidManifest.xml中加入android.permission.KILL_BACKGROUND_PROCESSES权限，否则会出现权限错误。 

运行效果如下。

需要注意的是，系统进程是不能结束的。