Android之浮动小窗口

//创建创建全局变量类

 1 public class MyApplication extends Application {

 2     

 3     /**

 4      * 创建全局变量

 5      * 全局变量一般都比较倾向于创建一个单独的数据类文件，并使用static静态变量

 6      * 

 7      * 这里使用了在Application中添加数据的方法实现全局变量

 8      * 注意在AndroidManifest.xml中的Application节点添加android:name=".MyApplication"属性

 9      * 

      */

     private WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams();

 

     public WindowManager.LayoutParams getMywmParams(){

         return wmParams;

     }

//Activity类 

 1 public class MyFloatViewActivity extends Activity {

 2    

 3 

 4     /** Called when the activity is first created. */

 5     

 6     private WindowManager wm=null;

 7     private WindowManager.LayoutParams wmParams=null;

 8     

 9     private MyFloatView myFV=null;

 

     

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);

     

     }

     

     private void createView(){

         myFV=new MyFloatView(getApplicationContext());

         myFV.setImageResource(R.drawable.icon);

         //获取WindowManager

         wm=(WindowManager)getApplicationContext().getSystemService("window");

         //设置LayoutParams(全局变量）相关参数

         wmParams = ((MyApplication)getApplication()).getMywmParams();

 

          /**

          *以下都是WindowManager.LayoutParams的相关属性

          * 具体用途可参考SDK文档

          */

         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

         //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

     public void onDestroy(){

         super.onDestroy();

         //在程序退出(Activity销毁）时销毁悬浮窗口

         wm.removeView(myFV);

     }

     

     @Override

     protected void onRestart() {

         // TODO Auto-generated method stub

         wm.removeView(myFV);

         super.onRestart();

     }

 

     @Override

     protected void onStop() {

         // TODO Auto-generated method stub

         //创建悬浮窗口

         createView();

         super.onStop();

     }  

//浮动窗口内容类

 1 public class MyFloatView extends ImageView {

 2     private float mTouchStartX;

 3     private float mTouchStartY;

 4     private float x;

 5     private float y;

 6     

 8     private WindowManager wm=(WindowManager)getContext().getApplicationContext().getSystemService("window");

 9     

     //此wmParams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);        

         // TODO Auto-generated constructor stub

     }

     

      @Override

      public boolean onTouchEvent(MotionEvent event) {

          

          //getRawX()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:

                 //getX()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:                

                 updateViewPosition();

                 break;

 

             case MotionEvent.ACTION_UP:

                 updateViewPosition();

                 mTouchStartX=mTouchStartY=0;

                 break;

             }

             return true;

         }

      

      private void updateViewPosition(){

         //更新浮动窗口位置参数,x是鼠标在屏幕的位置，mTouchStartX是鼠标在图片的位置

         wmParams.x=(int)( x-mTouchStartX);

         System.out.println(mTouchStartX);

         wmParams.y=(int) (y-mTouchStartY);

         wm.updateViewLayout(this, wmParams);

         

      }

 

 }

在androidManifest中设置：

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