Android系列之任务管理器的设计实现

亦凉 2021-09-10 15:54 434阅读 0赞

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

![Center][]

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("\\n包名: " + packageInfo.packageName);  
  messageDetail.append("\\n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][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"?>

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][http_schemas.android.com_apk_res_android]"  
 android:orientation="vertical" android:layout\_width="90px"  
 android:layout\_height="wrap\_content" android:gravity="center">

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][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"/>

</manifest>

图片:

![Center 1][]

![Center 2][]

![Center 3][]

[Center]: /images/20210813/4f04ce32a42849dab8377689e28ac833.png
[http_schemas.android.com_apk_res_android]: http://schemas.android.com/apk/res/android
[Center 1]: /images/20210813/f4c123d9036b4cb2a8380658acc22ceb.png
[Center 2]: /images/20210813/fed8dc47a14143b0b82e4bb8cfd050cf.png
[Center 3]: /images/20210813/ba89fdf8da1742d58c9f36e268f2ed3e.png