安卓任务管理器的设计与实现

项目结构如图，MyToast类是自定义的Toast类，MainActivity是主要Activity类

MainActivity.java:

package com.taskManager.activity;

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

import android.app.Activity;
import android.app.ActivityManager;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements Runnable , OnItemClickListener{
   
 //Handler用来识别的标志
 private static final int SEARCH_APP = 0;
 private static final int DELETE_APP = 1;
 
 GridView gv;
 ListView lv;
 //加载程序信息的List
 private List<PackageInfo> packageInfo;
 //存放手机所有程序信息的List
 private List<PackageInfo> showPackageInfo;
 //存放用户安装程序信息的List
 private List<PackageInfo> userPackageInfo;
 
 private ProgressDialog pd;
 ImageButton ib_change_view;
 ImageButton ib_change_category ;
 private boolean allApplication = true;
 private boolean isListView = false;
 /**
  * 程序一个Handler，用来接收进程传过来的信息
  * 然后设置ListView和GridView的适配器
  */
 private Handler mHandler = new Handler()
 {
  @Override
  public void handleMessage(Message msg) {
   super.handleMessage(msg);
   //接收成功
   if(msg.what == SEARCH_APP)
   {
    showPackageInfo = packageInfo;
    lv.setAdapter(new ListViewAdapter(MainActivity.this,showPackageInfo));
    gv.setAdapter(new GridViewAdapter(MainActivity.this,showPackageInfo));
    pd.dismiss();
   }
   else if(msg.what == DELETE_APP){
    
   }
  }
  
 };
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //去除标题       
     requestWindowFeature(Window.FEATURE_NO_TITLE);
        
     //全屏显示
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);
        findView();
        initSettings();
    }
    
    /**
     * 加载视图
     */
    private void findView() {
     gv = (GridView)this.findViewById(R.id.gv_apps);
     lv = (ListView)this.findViewById(R.id.lv_apps);
        pd = ProgressDialog.show(this,"温馨提示","加载中,请稍等...",true,false);
        ib_change_category = (ImageButton)this.findViewById(R.id.ib_change_category);
        ib_change_view = (ImageButton)this.findViewById(R.id.ib_change_view);
 }

    /**
     * 初始化设置
     */
 private void initSettings() {  
  Thread t = new Thread(this);
  t.start();
  ib_change_category.setOnClickListener(changeAppsCategory);
  ib_change_view.setOnClickListener(changeListView);
  gv.setOnItemClickListener(this);
  lv.setOnItemClickListener(this);
 }
 //添加GridView ItemClick监听器
 private GridView.OnItemClickListener gvItemClickListener = new GridView.OnItemClickListener(){
  @Override
  public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
    long arg3) { 
  }
 };
 //ListView ItemClick监听器
 private ListView.OnItemClickListener lvItemClickListener = new ListView.OnItemClickListener(){
  @Override
  public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
    long arg3) { 
  }  
 };
 //点击事件
 private ImageButton.OnClickListener changeListView = new ImageButton.OnClickListener(){
  @Override
  public void onClick(View v) {
   if(isListView){
    MyToast.myToastShow(MainActivity.this, R.drawable.grids, "表格视图", Toast.LENGTH_SHORT);
    ib_change_view.setImageResource(R.drawable.grids);
    lv.setVisibility(View.GONE);
    gv.setVisibility(View.VISIBLE);
    isListView = false;
   }   
   else {
    MyToast.myToastShow(MainActivity.this, R.drawable.list, "列表视图", Toast.LENGTH_SHORT);
    ib_change_view.setImageResource(R.drawable.list);
    lv.setVisibility(View.VISIBLE);
    gv.setVisibility(View.GONE);
    isListView = true;
   }
  }
  
 };
 //点击事件
 private ImageButton.OnClickListener changeAppsCategory =  new ImageButton.OnClickListener(){
  @Override
  public void onClick(View v) {
   
   if(allApplication){
    ib_change_category.setImageResource(R.drawable.user);
    showPackageInfo = userPackageInfo;
    allApplication = false;
    MyToast.myToastShow(MainActivity.this, R.drawable.user, "用户的APP", Toast.LENGTH_SHORT);
   }
   else{
    MyToast.myToastShow(MainActivity.this, R.drawable.all, "所有的APP", Toast.LENGTH_SHORT);
    ib_change_category.setImageResource(R.drawable.all);
    showPackageInfo = packageInfo;
    allApplication = true;    
   }
   gv.setAdapter(new GridViewAdapter(MainActivity.this,showPackageInfo));
   lv.setAdapter(new ListViewAdapter(MainActivity.this,showPackageInfo));
  }  
 };

 //GridView的适配器类
    class GridViewAdapter extends BaseAdapter{

     LayoutInflater inflater;
     List<PackageInfo> pkInfo;
     public GridViewAdapter(Context context,List<PackageInfo> packageInfos){
      inflater = LayoutInflater.from(context);
      this.pkInfo = packageInfos;
     }
  @Override
  public int getCount() {
   return pkInfo.size();
  }

  @Override
  public Object getItem(int arg0) {
   return pkInfo.get(arg0);
  }

  @Override
  public long getItemId(int position) {
   return position;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   View view = inflater.inflate(R.layout.gv_item, null);
   TextView tv = (TextView)view.findViewById(R.id.gv_item_appname);
   ImageView iv =(ImageView) view.findViewById(R.id.gv_item_icon);
   tv.setText(pkInfo.get(position).applicationInfo.loadLabel(getPackageManager()));
   iv.setImageDrawable(pkInfo.get(position).applicationInfo.loadIcon(getPackageManager()));
   return view;
  }
     
    }

  //ListView的适配器类
    class ListViewAdapter extends BaseAdapter{
     LayoutInflater inflater;
     List<PackageInfo> pkInfo;
     public ListViewAdapter(Context context,List<PackageInfo> packageInfos){
      inflater = LayoutInflater.from(context);
      this.pkInfo = packageInfos;
     }
  @Override
  public int getCount() {
   return pkInfo.size();
  }
  @Override
  public Object getItem(int arg0) {
   return pkInfo.get(arg0);
  }
  @Override
  public long getItemId(int position) {
   return position;
  }
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   View view = inflater.inflate(R.layout.list_item, null);
   TextView tv_appName = (TextView)view.findViewById(R.id.lv_item_appname);
   TextView tv_packageName = (TextView)view.findViewById(R.id.lv_item_packageame);
   ImageView iv =(ImageView) view.findViewById(R.id.lv_icon);
   
   tv_appName.setText(pkInfo.get(position).applicationInfo.loadLabel(getPackageManager()));
   tv_packageName.setText(pkInfo.get(position).packageName);
   iv.setImageDrawable(pkInfo.get(position).applicationInfo.loadIcon(getPackageManager()));
   return view;
  }
    }
 
    /**
     * 开一个进程，用Handler来传送Message
     */
    @Override
 public void run() {  
  packageInfo = getPackageManager().getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES
    | PackageManager.GET_ACTIVITIES);
  userPackageInfo = new ArrayList<PackageInfo>();
  for (int i =0;i<packageInfo.size();i++){
   PackageInfo temp = packageInfo.get(i);
   ApplicationInfo appInfo = temp.applicationInfo;
   boolean flag = false;
   //用户安装的程序
   if((appInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0){
    flag = true;
   }
   else if((appInfo.flags & ApplicationInfo.FLAG_SYSTEM) ==0){
    flag = true;
   }
   if(flag){
    userPackageInfo.add(temp);
   }
  }
  //进程睡眠3秒
  try {
   Thread.sleep(3000);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
  mHandler.sendEmptyMessage(SEARCH_APP);
  try {
   Thread.currentThread();
   Thread.sleep(5000);
   //用Handler传送Message
   mHandler.sendEmptyMessage(DELETE_APP);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }  
 }
 
    /**
     * ItemClick的处理
     */
 @Override
 public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) { 
  final PackageInfo tempPkInfo = showPackageInfo.get(position);
  
  AlertDialog.Builder builder = new AlertDialog.Builder(this);
  builder.setTitle("选项");
  builder.setItems(R.array.choice, new DialogInterface.OnClickListener(){

   @Override
   public void onClick(DialogInterface dialog, int which) {
    switch(which){
    case 0:
     showAppDetail(tempPkInfo);
     break;
    case 1:
     ActivityManager activityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
     activityManager.killBackgroundProcesses(tempPkInfo.packageName);
     MyToast.myToastShow(getApplicationContext(), R.drawable.manage, "成功关闭进程!", 1000);
     break;
    }
    
   } 
   
  });
  builder.setNegativeButton("取消", null);
  builder.create();
  builder.show();
 }
 
 
 /**
  * Activity回传处理
  */
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  packageInfo = getPackageManager().getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES  | PackageManager.GET_ACTIVITIES);
  userPackageInfo = new ArrayList<PackageInfo>();
  for (int i =0;i<packageInfo.size();i++){
   PackageInfo temp = packageInfo.get(i);
   ApplicationInfo appInfo = temp.applicationInfo;
   boolean flag = false;
   //用户安装的程序
   if((appInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0){
    flag = true;
   }
   else if((appInfo.flags & ApplicationInfo.FLAG_SYSTEM) ==0){
    flag = true;
   }
   if(flag){
    userPackageInfo.add(temp);
   }
  }
  if(allApplication){
   showPackageInfo = packageInfo;
  }
  else{   
   showPackageInfo = userPackageInfo; 
  }
  gv.setAdapter(new GridViewAdapter(MainActivity.this,showPackageInfo));
  lv.setAdapter(new ListViewAdapter(MainActivity.this,showPackageInfo));
 }  

 /**
  *显示程序的详细详细
  */
 private void showAppDetail(PackageInfo packageInfo) {
  AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
  builder.setTitle("程序详细详细");
  StringBuffer messageDetail = new StringBuffer();
  messageDetail.append("程序名称: " + packageInfo.applicationInfo.loadLabel(getPackageManager()));
  messageDetail.append("
包名: " + packageInfo.packageName);
  messageDetail.append("
版本: " + packageInfo.versionName);
  builder.setMessage(messageDetail);
  builder.setIcon(packageInfo.applicationInfo.loadIcon(getPackageManager()));
  builder.setPositiveButton("确定", null);
  builder.create().show();
 }
 
 /**
  * 回退按钮处理
  */
 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  // TODO Auto-generated method stub
  
   if(keyCode==KeyEvent.KEYCODE_BACK&&event.getRepeatCount()==0){
             AlertDialog.Builder alertbBuilder=new AlertDialog.Builder(MainActivity.this);
             alertbBuilder.setTitle("提示").setMessage("确认退出？").setPositiveButton("确定", new DialogInterface.OnClickListener() {
                     
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                             
                         MainActivity.this.finish();
                     }
             }).setNegativeButton("取消", new DialogInterface.OnClickListener() {
                     
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                             dialog.cancel();
                             
                     }
             }).create();
             //显示提示框
             alertbBuilder.show();
   }
             return super.onKeyDown(keyCode, event);
 }
}

MyToast.java:

package com.taskManager.activity;

import android.content.Context;
import android.graphics.Color;
import android.view.Gravity;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
/**
 * 
 *自定义的Toast类
 */
public class MyToast {
 public static void myToastShow(Context context,int imageResId,String content, int duration){
  Toast toast = new Toast (context);
  toast.setDuration(duration);
  toast.setGravity(Gravity.BOTTOM, 0, 25);
  
  LinearLayout toastLayout = new LinearLayout(context);
  toastLayout.setOrientation(LinearLayout.HORIZONTAL);
  toastLayout.setGravity(Gravity.CENTER_VERTICAL);
  //设置Toast的图标
  ImageView imageView  = new ImageView(context);
  imageView.setImageResource(imageResId);
  toastLayout.addView(imageView);
  //设置Toast的Text
  TextView tv_content = new TextView(context);
  tv_content.setText(content);
  tv_content.setBackgroundColor(Color.BLACK);
  
  toastLayout.addView(tv_content);
  
  toast.setView(toastLayout);
  
  toast.show();
  
 }
}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:background = "#313849"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <LinearLayout
     android:layout_height = "28px"
     android:layout_width = "fill_parent"
     android:orientation ="horizontal"
     android:gravity = "center_vertical"
     android:paddingLeft = "5px"
     android:background ="@drawable/top_bg"     
    >
    <ImageView
     android:layout_width = "18px"
     android:layout_height ="18px" 
     android:src = "@drawable/manage"/>
    
    <TextView
     android:layout_width ="wrap_content"
     android:layout_height ="wrap_content"
     android:textColor = "#000"
     android:textSize= "14px"
     android:paddingLeft = "10px"
     android:paddingTop = "5px"
     android:text = "任务管理器 v1.0.0"/>
    </LinearLayout>
    
    <GridView android:id="@+id/gv_apps"
      android:layout_width = "fill_parent"
      android:layout_height = "fill_parent"
      android:numColumns = "3"
      android:horizontalSpacing = "10px"
      android:verticalSpacing = "10px"
      android:listSelector = "@drawable/choose_gridview"
      android:layout_marginLeft = "5px"
      android:layout_marginTop = "28px"
      android:layout_marginBottom = "58px"
      android:layout_marginRight = "5px"/>
 <ListView
     android:id="@+id/lv_apps"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:listSelector="@drawable/choose_listview"
     android:layout_marginTop="28px"
     android:layout_marginBottom="58px"
     android:layout_marginLeft="5px"
     android:layout_marginRight="5px"
     android:visibility="gone"
    >
    </ListView>
    <RelativeLayout
     android:layout_width = "fill_parent"
     android:layout_height ="58px"
     android:layout_alignParentBottom = "true"
     android:background = "@drawable/bottom_bg"
     >
  <ImageButton
     android:id="@+id/ib_change_view"
     android:layout_alignParentLeft="true"
     android:layout_marginLeft="5px"
     android:layout_marginTop="1px"
     android:src="@drawable/list"
     android:layout_width="76px"
     android:layout_height="54px"/>
    <ImageButton
     android:id="@+id/ib_change_category"
     android:layout_alignParentRight="true"
     android:layout_marginRight="5px"
     android:layout_marginTop="1px"
     android:src="@drawable/all"
     android:layout_width="76px"
     android:layout_height="54px"/>
    </RelativeLayout>

</RelativeLayout>

list_item.xml:

<?xml version="1.0" encoding="utf-8"?>

<!-- 
整体是一个LinearLayout，
1、 布局方向为水平布局，
2、 宽fill_parent
3、 高wrap_content
4、 内容的方向垂直居中
5、 ImageView
 a) Id为lv_icon
 b) 距离父控件的顶部和底部都是5px
 c) 宽、高48px
6、 LinearLayout
 a) 布局方向为垂直布局
 b) 宽wrap_content
 c) 高48px
 d) 左边预留5px的距离
 e) TextView
  i. Id为lv_item_appname
  ii. 宽fill_parent
  iii. 高wrap_content
  iv. 单行显示
  v. 字体大小16px
  vi. 字体样式:加粗
  vii. 字体颜色:#fff
 f) TextView
  i. Id为lv_item_packagenam
  ii. 宽fill_parent
  iii. 高wrap_content
  iv. 单行显示
  v. 字体颜色#fff
 -->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="horizontal" android:layout_width="fill_parent"
 android:layout_height="wrap_content" android:gravity="center_vertical">
 
 <ImageView
  android:id="@+id/lv_icon"
  android:layout_width="48px"
  android:layout_height="48px"
  android:layout_marginTop="5px"
  android:layout_marginBottom="5px"
 ></ImageView>
 <LinearLayout
  android:orientation="vertical"
  android:layout_width="wrap_content"
  android:layout_height="48px"
  android:paddingLeft="5px"
  >
  <TextView
   android:id="@+id/lv_item_appname"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:singleLine="true"
   android:textSize="16px"
   android:textStyle="bold"
   android:textColor="#fff"
  ></TextView>
  
  <TextView
   android:id="@+id/lv_item_packageame"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:singleLine="true"
   android:textColor="#fff"
  ></TextView>
  
  
 </LinearLayout>
</LinearLayout>




gv_item.xml:

<?xml version="1.0" encoding="utf-8"?>

 <!--

  a) LinearLayout i. 高：wrap_content ii. 宽：90px iii. 布局方向：垂直 iv.
  设置里面的控件的位置为中间 v. ImageView 1. 设置id为gv_item_icon 2. 宽高都为64px vi.
  TextView 1. 设置id为gv_item_appname 2. 宽高都为wrap_content 3. 设置为2行 4.
  字体大小16px 5. 颜色#FFF
 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="90px"
 android:layout_height="wrap_content" android:gravity="center">

 <ImageView android:id="@+id/gv_item_icon"
  android:layout_width="64px" android:layout_height="64px">
 </ImageView>
 <TextView android:id="@+id/gv_item_appname"
  android:layout_width="wrap_content" android:layout_height="wrap_content"
  android:lines="2" android:textSize="16px" android:textColor="#FFF" />
</LinearLayout>

string.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, AppExplorer!</string>
    <string name="app_name">安卓任务管理器</string>
    <array name="choice">
     <item name="detail">详细信息</item>
     <item name="close">关闭进程</item>
    </array>
</resources>

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.taskManager.activity"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />
    <uses-permission android:name="android.permission.GET_TASKS" />
 <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />
 <uses-permission android:name="android.permission.GET_PACKAGE_SIZE"/>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".MainActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>