android 悬浮窗口

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package com.test;

import android.app.Activity;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.View.OnTouchListener;

public class FloatPop extends Activity {
   WindowManager wm = null;
   WindowManager.LayoutParams wmParams = null;
   View view;
   private float mTouchStartX;
   private float mTouchStartY;
   private float x;
   private float y;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Intent service = new Intent();
       service.setClass(this, TopFloatService.class);
       startService(service);
       // view = LayoutInflater.from(this).inflate(R.layout.floating, null);
       //createView();
    }

    private void createView() {
       // ��ȡWindowManager

       wm = (WindowManager) FloatPop.this.getSystemService("window");
       // ��LayoutParams(ȫ�ֱ��ز��
       //wmParams = ((ApplicationTest) getApplication()).getMywmParams();
       wmParams = new WindowManager.LayoutParams();
       wmParams.type = WindowManager.LayoutParams.TYPE_PHONE;// ��ṩ��û��Ӧ�ó��Ϸ��״̬��
       wmParams.flags |= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;// ��κΰ��¼�
       wmParams.gravity = Gravity.LEFT | Gravity.TOP; // ��Ͻ�
       // ��Ļ��Ͻ�Ϊԭ�㣬��x��y��ʼֵ
       wmParams.x = 0;
       wmParams.y = 0;
       // ��ڳ��
       wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
       wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
       wmParams.format = PixelFormat.RGBA_8888;

       wm.addView(view, wmParams);

       view.setOnTouchListener(new OnTouchListener() {
           public boolean onTouch(View v, MotionEvent event) {
               // ��ȡ��Ļ��꣬��Ļ��Ͻ�Ϊԭ��
               x = event.getRawX();
               // 25��ϵͳ״̬��ĸ߶�,Ҳ��ͨ��õ�׼ȷ��ֵ��Լ�΢��
               y = event.getRawY()-25 ;
               switch (event.getAction()) {
               case MotionEvent.ACTION_DOWN:
                   // ��ȡ��View��꣬��Դ�View��Ͻ�Ϊԭ��
                   mTouchStartX = event.getX();
                   mTouchStartY = event.getY()+view.getHeight()/2;
                   break;
               case MotionEvent.ACTION_MOVE:
                   updateViewPosition();
                   break;
               case MotionEvent.ACTION_UP:
                   updateViewPosition();
                   mTouchStartX = mTouchStartY = 0;
                   break;
               }
               return true;
           }

       });
   }

   private void updateViewPosition() {
       // ��¸��λ�ò��
       wmParams.x = (int) (x - mTouchStartX);
       wmParams.y = (int) (y - mTouchStartY);
       wm.updateViewLayout(view, wmParams);
   }

}

package com.test;

import android.app.Service;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.IBinder;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.WindowManager;

public class TopFloatService extends Service {

   WindowManager wm = null;
   WindowManager.LayoutParams wmParams = null;
   View view;
   private float mTouchStartX;
   private float mTouchStartY;
   private float x;
   private float y;

   @Override
   public void onCreate() {
       super.onCreate();
       view = LayoutInflater.from(this).inflate(R.layout.floating, null);
       createView();
   }

   private void createView() {
       // ��ȡWindowManager

       wm = (WindowManager) TopFloatService.this.getSystemService("window");
       // ��LayoutParams(ȫ�ֱ��ز��
       //wmParams = ((ApplicationTest) getApplication()).getMywmParams();
       wmParams = new WindowManager.LayoutParams();
       wmParams.type = WindowManager.LayoutParams.TYPE_PHONE;// ��ṩ��û��Ӧ�ó��Ϸ��״̬��
       wmParams.flags |= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;// ��κΰ��¼�
       wmParams.gravity = Gravity.LEFT | Gravity.TOP; // ��Ͻ�
       // ��Ļ��Ͻ�Ϊԭ�㣬��x��y��ʼֵ
       wmParams.x = 0;
       wmParams.y = 0;
       // ��ڳ��
       wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
       wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
       wmParams.format = PixelFormat.RGBA_8888;

       wm.addView(view, wmParams);

       view.setOnTouchListener(new OnTouchListener() {
           public boolean onTouch(View v, MotionEvent event) {
               // ��ȡ��Ļ��꣬��Ļ��Ͻ�Ϊԭ��
               x = event.getRawX();
               // 25��ϵͳ״̬��ĸ߶�,Ҳ��ͨ��õ�׼ȷ��ֵ��Լ�΢��
               y = event.getRawY()-25 ;
               switch (event.getAction()) {
               case MotionEvent.ACTION_DOWN:
                   // ��ȡ��View��꣬��Դ�View��Ͻ�Ϊԭ��
                   mTouchStartX = event.getX();
                   mTouchStartY = event.getY()+view.getHeight()/2;
                   break;
               case MotionEvent.ACTION_MOVE:
                   updateViewPosition();
                   break;
               case MotionEvent.ACTION_UP:
                   updateViewPosition();
                   mTouchStartX = mTouchStartY = 0;
                   break;
               }
               return true;
           }

       });
   }

   private void updateViewPosition() {
       // ��¸��λ�ò��
       wmParams.x = (int) (x - mTouchStartX);
       wmParams.y = (int) (y - mTouchStartY);
       wm.updateViewLayout(view, wmParams);
   }

   @Override
   public IBinder onBind(Intent intent) {
       return null;
   }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.test"
      android:versionCode="1"
      android:versionName="1.0">
      <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".FloatPop"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
<service android:name=".TopFloatService"/>
    </application>
</manifest>