android实现桌面移动悬浮窗口

package com.example.suspend;
 
import android.content.Context;
import android.util.Log;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.widget.ImageView;
 
public class MyFloatView extends ImageView {
 private float mTouchStartX;
 private float mTouchStartY;
 private float x;
 private float y;
 
 private WindowManager wm = (WindowManager) getContext()
  .getApplicationContext().getSystemService("window");
 // 此wmParams变量为获取的全局变量，用以保存悬浮窗口的属性
 private WindowManager.LayoutParams wmParams = ((MyApplication) getContext()
  .getApplicationContext()).getMywmParams();
 
 public MyFloatView(Context context) {
 super(context);
 }
 
 @Override
 public boolean onTouchEvent(MotionEvent event) {
 // TODO Auto-generated method stub
 // 获取相对屏幕的坐标，即以屏幕左上角为原点
 x = event.getRawX();
 y = event.getRawY() - 25; // 25是系统状态栏的高度
 Log.i("currP", "currX" + x + "====currY" + y);
 
 switch (event.getAction()) {
 case MotionEvent.ACTION_DOWN: // 捕获手指触摸按下动作
  // 获取相对View的坐标，即以此View左上角为原点
  mTouchStartX = event.getX();
  mTouchStartY = event.getY();
  Log.i("startP", "startX" + mTouchStartX + "====startY"
   + mTouchStartY);
  break;
 case MotionEvent.ACTION_MOVE://捕获手指触摸移动动作      
  updateViewPosition(); 
  break;
 case MotionEvent.ACTION_UP://捕获手指触摸离开动作 
  updateViewPosition(); 
  mTouchStartX=mTouchStartY=0; 
  break;
 default:
  break;
 }
 return true;
 }
 
 private void updateViewPosition() {
 //更新浮动窗口位置参数 
 wmParams.x = (int)(x - mTouchStartX);
 wmParams.y = (int)(y - mTouchStartY);
 wm.updateViewLayout(this, wmParams);//刷新显示  
 }
}

package com.example.suspend;
 
import android.app.Application;
import android.view.WindowManager;
 
public class MyApplication extends Application {
 private WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams();
 
 @Override
 public void onCreate() {
 // TODO Auto-generated method stub
 super.onCreate();
 }
 
 public WindowManager.LayoutParams getMywmParams() {
 return wmParams;
 
 }
 
}

package com.example.suspend;
 
import android.app.Activity;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.view.Gravity;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
 
public class MainActivity extends Activity {
 private WindowManager wm;
 private WindowManager.LayoutParams wmParams;
 private MyFloatView myFV;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 // 创建悬浮窗口
 createFloatView();
 }
 
 private void createFloatView() {
 myFV = new MyFloatView(getApplicationContext());
 myFV.setImageResource(R.drawable.ic_launcher);
 // 获取WindowManager
 wm = (WindowManager) getApplicationContext().getSystemService("window");
 // 设置LayoutParams(全局变量）相关参数
 wmParams = ((MyApplication) getApplication()).getMywmParams();
 
 wmParams.type = LayoutParams.TYPE_PHONE;// 设置window type
 wmParams.format = PixelFormat.RGBA_8888;// 设置图片格式，效果为背景透明
 // 设置Window flag
 wmParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL
  | LayoutParams.FLAG_NOT_FOCUSABLE;
 /*
  * 
  * 下面的flags属性的效果形同“锁定”。
  * 
  * 悬浮窗不可触摸，不接受任何事件,同时不影响后面的事件响应。
  * 
  * wmParams.flags=LayoutParams.FLAG_NOT_TOUCH_MODAL
  * 
  * | LayoutParams.FLAG_NOT_FOCUSABLE
  * 
  * | LayoutParams.FLAG_NOT_TOUCHABLE;
  */
 wmParams.gravity = Gravity.LEFT | Gravity.TOP;// 调整悬浮窗口至左上角，便于调整坐标
 // 以屏幕左上角为原点，设置x、y初始值
 wmParams.x = 0;
 wmParams.y = 0;
 // 设置悬浮窗口长宽数据
 wmParams.width = 40;
 wmParams.height = 40;
 // 显示myFloatView图像
 wm.addView(myFV, wmParams);
 }
 
 @Override
 protected void onDestroy() {
 // TODO Auto-generated method stub
 super.onDestroy();
 // 在程序退出(Activity销毁）时销毁悬浮窗口
 wm.removeView(myFV);
 }
}

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
  <uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />