Android使用WindowManager构造悬浮view

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:

<?xml version="1.0" encoding="utf-8"?>

item_layout.xml:

<?xml version="1.0" encoding="utf-8"?>

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。

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