WindowManager创建悬浮窗的简单例子

来源：互联网发布：把linux安装到移动硬盘编辑：程序博客网时间：2024/05/17 07:14

package com.example.happycodinggirl.testwindowmanager;import android.content.Context;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.util.Log;import android.view.Display;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.WindowManager;import android.widget.Button;public class MainActivity extends ActionBarActivity {    private WindowManager windowManager;    private View floatview;    private WindowManager floatWindowManager;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button button= (Button) findViewById(R.id.button);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if (floatWindowManager==null){                createFloatView();                }            }        });    }    public void createFloatView(){        floatview =LayoutInflater.from(this).inflate(R.layout.floatlayout,null);        mearsureView(floatview);       // windowManager =getWindowManager();       // Log.v("TAG","-----activity windowManager---"+ windowManager);        floatWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);        Log.v("TAG","----floatWindowManager is---"+ floatWindowManager);        Display display= floatWindowManager.getDefaultDisplay();        int width=display.getWidth();        int height=display.getHeight();        WindowManager.LayoutParams layoutParams=new WindowManager.LayoutParams();        layoutParams.type= WindowManager.LayoutParams.TYPE_PHONE;        layoutParams.flags= WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL|                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;        layoutParams.gravity= Gravity.LEFT|Gravity.TOP;        layoutParams.x=width/2- floatview.getMeasuredWidth()/2;        layoutParams.y=height/2- floatview.getMeasuredHeight()/2;        layoutParams.width=floatview.getMeasuredWidth();        layoutParams.height=floatview.getMeasuredHeight();        floatWindowManager.addView(floatview, layoutParams);    }    public void mearsureView(View view){        int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);        view.measure(w, h);    }    @Override    protected void onDestroy() {        super.onDestroy();        if (floatWindowManager!=null){            floatWindowManager.removeView(floatview);        }    }}

每一个WindowManager都绑定一个Display.你可以通过createDisplayContext(Display)来得到一个这个Display
所属于的Context上下文，然后使用这个上下文context.getSystemService(Context.WINDOW_SERVICE)
来获得一个WindowManager.该功能还未试过，以后尝试下。
gravity属性指的不是view的位置，而是基准点的位置。比如上面代码为
LEFT和TOP,则就是以左上为基准，layoutParams.x,y分别是偏移
该基准位置的距离。所以上面代码展示出来的效果是局屏幕中间显示的
一个view.
另外，activity有个getWindowManager的方法返回一个WindowManager,
为了展示自定义的Windows使用。测试了下换为activity下的windowManager，
发现背景都变为黑色的了。还未深入研究，以后再继续深挖。
完整代码地址

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