Android常用控件之悬浮窗（Service实现）

悬浮窗可以显示在所有应用程序之上，不管在PC机还是Android设备上都有这个，最常见的是360的“加速球”

来看下在Android设备上的效果

程序的目录结构如下图

创建Activity后启动Service就关闭

 package com.example.floatwnd;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;

 import com.example.floatwnd.service.FloatService;

 public class MainActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         Intent intent = new Intent(MainActivity.this, FloatService.class);
         startService(intent);
         finish();
     }
 }

悬浮窗的主要工作放在Service上处理

 package com.example.floatwnd.service;

 import android.app.Service;
 import android.content.Intent;
 import android.graphics.PixelFormat;
 import android.graphics.Rect;
 import android.os.Handler;
 import android.os.IBinder;
 import android.os.Looper;
 import android.os.Message;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.View.OnTouchListener;
 import android.view.WindowManager;
 import android.view.WindowManager.LayoutParams;
 import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;

 import com.example.floatwnd.R;
 import com.example.floatwnd.utils.SysInfoUtils;

 /**
  * 悬浮窗Service 该服务会在后台一直运行一个悬浮的透明的窗体
  *
  * @author Administrator
  *
  */
 public class FloatService extends Service {

     private static final int UPDATE_PIC = 0x100;
     private int statusBarHeight;// 状态栏高度
     private View view;// 透明窗体
     private TextView text = null;
     private Button hideBtn = null;
     private Button updateBtn = null;
     private HandlerUI handler = null;
     private Thread updateThread = null;
     private boolean viewAdded = false;// 透明窗体是否已经显示
     private boolean viewHide = false; // 窗口隐藏
     private WindowManager windowManager;
     private WindowManager.LayoutParams layoutParams;

     @Override
     public IBinder onBind(Intent arg0) {
         // TODO Auto-generated method stub
         return null;
     }

     @Override
     public void onCreate() {
         // TODO Auto-generated method stub
         super.onCreate();
         createFloatView();
     }

     @Override
     public void onStart(Intent intent, int startId) {
         // TODO Auto-generated method stub
         super.onStart(intent, startId);
         System.out.println("------------------onStart");
         viewHide = false;
         refresh();
     }

     @Override
     public void onDestroy() {
         // TODO Auto-generated method stub
         super.onDestroy();
         removeView();
     }

     /**
      * 关闭悬浮窗
      */
     public void removeView() {
         if (viewAdded) {
             windowManager.removeView(view);
             viewAdded = false;
         }
     }

     private void createFloatView() {
         handler = new HandlerUI();
         UpdateUI update = new UpdateUI();
         updateThread = new Thread(update);
         updateThread.start(); // 开户线程

         view = LayoutInflater.from(this).inflate(R.layout.main, null);
         text = (TextView) view.findViewById(R.id.usage);
         hideBtn = (Button) view.findViewById(R.id.hideBtn);
         updateBtn = (Button) view.findViewById(R.id.updateBtn);
         windowManager = (WindowManager) this.getSystemService(WINDOW_SERVICE);
         /*
          * LayoutParams.TYPE_SYSTEM_ERROR：保证该悬浮窗所有View的最上层
          * LayoutParams.FLAG_NOT_FOCUSABLE:该浮动窗不会获得焦点，但可以获得拖动
          * PixelFormat.TRANSPARENT：悬浮窗透明
          */
         layoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT,
                 LayoutParams.WRAP_CONTENT, LayoutParams.TYPE_SYSTEM_ERROR,
                 LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSPARENT);
         // layoutParams.gravity = Gravity.RIGHT|Gravity.BOTTOM; //悬浮窗开始在右下角显示
         layoutParams.gravity = Gravity.LEFT | Gravity.TOP;

         /**
          * 监听窗体移动事件
          */
         view.setOnTouchListener(new OnTouchListener() {
             float[] temp = new float[] { 0f, 0f };

             public boolean onTouch(View v, MotionEvent event) {
                 layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
                 int eventaction = event.getAction();
                 switch (eventaction) {
                 case MotionEvent.ACTION_DOWN: // 按下事件，记录按下时手指在悬浮窗的XY坐标值
                     temp[0] = event.getX();
                     temp[1] = event.getY();
                     break;

                 case MotionEvent.ACTION_MOVE:
                     refreshView((int) (event.getRawX() - temp[0]),
                             (int) (event.getRawY() - temp[1]));
                     break;

                 }
                 return true;
             }
         });

         hideBtn.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 viewHide = true;
                 removeView();
                 System.out.println("----------hideBtn");
             }
         });

         updateBtn.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 Toast.makeText(getApplicationContext(), "you click UpdateBtn",
                         Toast.LENGTH_SHORT).show();
                 System.out.println("mom "
                         + SysInfoUtils
                                 .getUsedPercentValue(getApplicationContext()));
             }
         });
     }

     /**
      * 刷新悬浮窗
      *
      * @param x
      *            拖动后的X轴坐标
      * @param y
      *            拖动后的Y轴坐标
      */
     private void refreshView(int x, int y) {
         // 状态栏高度不能立即取，不然得到的值是0
         if (statusBarHeight == 0) {
             View rootView = view.getRootView();
             Rect r = new Rect();
             rootView.getWindowVisibleDisplayFrame(r);
             statusBarHeight = r.top;
         }

         layoutParams.x = x;
         // y轴减去状态栏的高度，因为状态栏不是用户可以绘制的区域，不然拖动的时候会有跳动
         layoutParams.y = y - statusBarHeight;// STATUS_HEIGHT;
         refresh();
     }

     /**
      * 添加悬浮窗或者更新悬浮窗 如果悬浮窗还没添加则添加 如果已经添加则更新其位置
      */
     private void refresh() {
         // 如果已经添加了就只更新view
         if (viewAdded) {
             windowManager.updateViewLayout(view, layoutParams);
         } else {
             windowManager.addView(view, layoutParams);
             viewAdded = true;
         }
     }

     /**
      * 接受消息和处理消息
      *
      * @author Administrator
      *
      */
     class HandlerUI extends Handler {
         public HandlerUI() {

         }

         public HandlerUI(Looper looper) {
             super(looper);
         }

         /**
          * 接收消息
          */
         @Override
         public void handleMessage(Message msg) {
             // TODO Auto-generated method stub
             // 根据收到的消息分别处理
             if (msg.what == UPDATE_PIC) {
                 text.setText(SysInfoUtils
                         .getUsedPercentValue(getApplicationContext())
                         + "  t = "
                         + SysInfoUtils.getTotalMemory(getApplicationContext())
                         + "  a = "
                         + SysInfoUtils
                                 .getAvailableMemoryString(getApplicationContext()));
                 if (!viewHide)
                     refresh();
             } else {
                 super.handleMessage(msg);
             }

         }

     }

     /**
      * 更新悬浮窗的信息
      *
      * @author Administrator
      *
      */
     class UpdateUI implements Runnable {

         @Override
         public void run() {
             // TODO Auto-generated method stub
             // 如果没有中断就一直运行
             while (!Thread.currentThread().isInterrupted()) {
                 Message msg = handler.obtainMessage();
                 msg.what = UPDATE_PIC; // 设置消息标识
                 handler.sendMessage(msg);
                 // 休眠1s
                 try {
                     Thread.sleep(1000);
                 } catch (InterruptedException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
             }
         }
     }
 }

为悬浮窗创建布局文件

 xml version="1.0" encoding="UTF-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:background="@drawable/background" >



     <TextView
         android:id="@+id/flowspeed"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentTop="true"
         android:layout_centerInParent="true"
         android:text="@string/float_text"
         android:textColor="#000000" />

     <Button
         android:id="@+id/hideBtn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@id/flowspeed"
         android:layout_centerInParent="true"
         android:layout_marginTop="15dp"
         android:background="@drawable/hide"
         android:contentDescription="@string/hide"
         android:text="@string/hide" />

     <Button
         android:id="@+id/updateBtn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@id/hideBtn"
         android:layout_centerInParent="true"
         android:background="@drawable/update"
         android:contentDescription="@string/update"
         android:paddingTop="15dp"
         android:text="@string/update" />

     <TextView
         android:id="@+id/usage"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@id/updateBtn"
         android:layout_centerInParent="true"
         android:paddingTop="15dp"
         android:text="@string/float_text"
         android:textColor="#000000" />

 RelativeLayout>

悬浮窗上的控件就跟Activity上一样使用

悬浮窗上显示的一些内存信息，通过工具类：SysInfoUtils.java来读取

完整的Demo可以从以下地址下载：

http://download.csdn.net/detail/deng0zhaotai/6577395

http://blog.csdn.net/deng0zhaotai/article/details/16827719