悬浮窗

 1 package com.bi.dialogactivity_xuanfuchuang.app;
 2 
 3 import android.graphics.Color;
 4 import android.graphics.PixelFormat;
 5 import android.support.v7.app.ActionBarActivity;
 6 import android.os.Bundle;
 7 import android.view.*;
 8 import android.widget.LinearLayout;
 9 import android.widget.TextView;
10 
11 
12 public class MainActivity extends ActionBarActivity {
13 
14     private LinearLayout ll;
15 
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.activity_main);
20 
21 
22         ll=new LinearLayout(this);
23        ll.setBackgroundColor(Color.BLUE);
24         Window window=getWindow();
25         WindowManager.LayoutParams layoutParams = window.getAttributes();
26 
27         layoutParams.gravity= Gravity.CENTER;
28 
29         //x只有gravity设置了Left right之后才起作用
30         //y只有gravity设置了top bottom之后才起作用
31         layoutParams.x=10;
32         layoutParams.y=10;
33         layoutParams.width=WindowManager.LayoutParams.MATCH_PARENT;
34         layoutParams.height=300;
35 
36         window.setAttributes(layoutParams);
37 
38         WindowManager manager=getWindowManager();
39         WindowManager.LayoutParams lp=new WindowManager.LayoutParams();
40         lp.gravity=Gravity.TOP|Gravity.LEFT;
41         lp.x=100;
42         lp.y=10;
43         lp.width=200;
44         lp.height=30;
45         lp.type=WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
46                 |WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
47         lp.flags=WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
48                 |WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;//用户点击悬浮窗之外区域能传递事件
49         //悬浮窗通过addView后如果悬浮窗可以获取焦点那么下层的activity将不能交互
50         manager.addView(ll,lp);
51 
52     }
53     //不重写此方法会导致回退键不能用
54     @Override
55     protected void onDestroy() {
56         //释放悬浮窗
57         WindowManager manager=getWindowManager();
58         manager.removeViewImmediate(ll);
59         super.onDestroy();
60     }
61 
62 
63 }

Main

上面是activity级别的悬浮窗 activity销毁的话悬浮窗也会销毁

下面的是系统级别的不会销毁

 1 package com.bi.xuanfuchuangxitong.app;
 2 
 3 import android.graphics.PixelFormat;
 4 import android.support.v7.app.ActionBarActivity;
 5 import android.os.Bundle;
 6 import android.util.Log;
 7 import android.view.*;
 8 import android.widget.ImageView;
 9 
10 
11 public class MainActivity extends ActionBarActivity {
12 
13 
14     private WindowManager.LayoutParams lp;
15     private WindowManager manager;
16     private static ImageView imageView;
17 
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22 
23         manager = (WindowManager)getApplicationContext().getSystemService(WINDOW_SERVICE);
24         //利用Application来创建ImageView避免activity退出导致的Context问题
25         if(imageView!=null){
26             manager.removeViewImmediate(imageView);
27         }
28 
29         imageView = new ImageView(getApplicationContext());
30         imageView.setImageResource(R.mipmap.ic_launcher);
31         //设置触摸监听
32         //建议使用匿名内部类来设置触摸的监听器
33         imageView.setOnTouchListener(new View.OnTouchListener() {
34             private float lastX, lastY;
35 
36             @Override
37             public boolean onTouch(View v, MotionEvent event) {
38                 boolean ret = false;
39                 int action = event.getAction();
40                 switch (action) {
41                     case MotionEvent.ACTION_DOWN:
42                         lastX = event.getRawX();
43                         lastY = event.getRawY();
44                         ret = true;
45                         Log.d("ff", "-->" + action);
46                         break;
47                     case MotionEvent.ACTION_MOVE:
48                         float cx = event.getRawX();
49                         float cy = event.getRawY();
50                         float ccx = cx - lastX;
51                         float ccy = cy - lastY;
52 
53                         lp.x += ccx;
54                         lp.y += ccy;
55                         //更新悬浮窗
56                         manager.updateViewLayout(imageView, lp);
57                         lastY=cy;
58                         lastX=cx;
59 
60                         Log.d("ff", "-->" + action);
61                         break;
62                     case MotionEvent.ACTION_UP:
63                         Log.d("ff", "-->" + action);
64                         break;
65                 }
66 
67                 return ret;
68             }
69         });
70 
71 
72         lp = new WindowManager.LayoutParams();
73         //对于应用程序实用的系统类型
74         //TYPE_SYSTEM_ALERT允许接收事件    TYPE_SYSTEM_OVERLAY只是悬浮
75         lp.type=WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
76                 |WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
77         lp.flags=WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
78                 |WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;//用户点击悬浮窗之外区域能传递事件
79         lp.gravity= Gravity.LEFT|Gravity.TOP;
80         lp.x=300;
81         lp.y=300;
82         lp.width=WindowManager.LayoutParams.WRAP_CONTENT;
83         lp.height=WindowManager.LayoutParams.WRAP_CONTENT;
84        lp.format= PixelFormat.TRANSPARENT;
85         manager.addView(imageView, lp);
86 
87 
88     }
89 
90 
91 
92 
93 }

main

最后需要添加权限

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