一般在android显示一个View都是通过Activity的setContentView设置的，但是还有一种方法，可以直接使用WindowManager在整个应用的最上层绘制我们需要显示的view，总体的效果类似于AlertDialog的弹出效果。

使用WindowManager构造这样的一个悬浮View也比较简单，直接通过windowmanager.addView()方法即可。

package com.gearmotion.app.windowmanagermotion;

import android.content.Context;

import android.graphics.PixelFormat;

import android.graphics.Rect;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewGroup;

import android.view.WindowManager;

import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, View.OnTouchListener {

Button mShowBtn;

Button mHideBtn;

WindowManager mWm;

LayoutInflater mLayoutInflater;

View mWindowView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mShowBtn = (Button) this.findViewById(R.id.showbtn);

mHideBtn = (Button) this.findViewById(R.id.hidebtn);

mShowBtn.setOnClickListener(this);

mHideBtn.setOnClickListener(this);

init();

}

private void init() {

mWm = (WindowManager) this.getApplicationContext().getSystemService(Context.WINDOW_SERVICE);

mLayoutInflater = LayoutInflater.from(this);

}

@Override

public void onClick(View v) {

if (mShowBtn.hashCode() == v.hashCode()) { //显示WindowManager

show();

}

if (mHideBtn.hashCode() == v.hashCode()) { //隐藏windowmanager

hide();

}

}

private void show() {

mWindowView = mLayoutInflater.inflate(R.layout.item_layout, null);

View popView = mWindowView.findViewById(R.id.root);

//设置popView的触摸事件，以便点击空白区域的时候使悬浮view消失

popView.setOnTouchListener(this);

WindowManager.LayoutParams lp = new WindowManager.LayoutParams();

//窗口类型同系统弹出框

lp.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;

//响应输入法

//lp.flags = WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;

//透明层

lp.format = PixelFormat.TRANSPARENT;

lp.width = WindowManager.LayoutParams.MATCH_PARENT;

lp.height = WindowManager.LayoutParams.MATCH_PARENT;

lp.gravity = Gravity.CENTER_VERTICAL;

mWm.addView(mWindowView, lp);

}

private void hide() {

if (mWindowView != null && mWindowView.getParent() != null) {

mWm.removeView(mWindowView);

}

}

@Override

public boolean onTouch(View v, MotionEvent event) {

int x = (int) event.getX();

int y = (int) event.getY();

//获取主view的可视区域

Rect globalRect = new Rect();

//获取悬浮view的可视区域

Rect tmpRect = new Rect();

v.getGlobalVisibleRect(globalRect);

View child = ((ViewGroup) v).getChildAt(0);

child.getHitRect(tmpRect);

if (!tmpRect.contains(x, y) && globalRect.contains(x, y)) {

hide();

}

return true;

}

}

activity_main.xml:

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context=".MainActivity">

android:id="@+id/showbtn"

android:layout_width="match_parent"

android:layout_height="50dp"

android:gravity="center"

android:text="show" />

android:id="@+id/hidebtn"

android:layout_width="match_parent"

android:layout_height="50dp"

android:gravity="center"

android:text="hide" />

item_layout.xml:

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:id="@+id/root"

android:orientation="vertical">

android:layout_width="match_parent"

android:layout_height="50dp"

android:text="I am WindowManager layout view"

android:textSize="20sp"

android:gravity="center"

android:layout_gravity="center"

android:background="#FFF8DC"

android:textColor="#7AC5CD"/>

实现效果如下：

以上就是本文的全部内容，希望对大家学习Android有所帮助，也希望大家多多支持脚本之家。