Android使用WindowManager構造懸浮view

2019-12-12 06:18:28

字體：大中小

來源：轉載

供稿：網友

一般在android顯示一個View都是通過Activity的setContentView設置的，但是還有一種方法，可以直接使用WindowManager在整個應用的最上層繪制我們需要顯示的view，總體的效果類似于AlertDialog的彈出效果。

使用WindowManager構造這樣的一個懸浮View也比較簡單，直接通過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()) { //顯示WindowManager   show();  }  if (mHideBtn.hashCode() == v.hashCode()) { //隱藏windowmanager   hide();  } } private void show() {  mWindowView = mLayoutInflater.inflate(R.layout.item_layout, null);  View popView = mWindowView.findViewById(R.id.root);  //設置popView的觸摸事件，以便點擊空白區域的時候使懸浮view消失  popView.setOnTouchListener(this);  WindowManager.LayoutParams lp = new WindowManager.LayoutParams();  //窗口類型同系統彈出框  lp.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;  //響應輸入法  //lp.flags = WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;  //透明層  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();  //獲取主view的可視區域  Rect globalRect = new Rect();  //獲取懸浮view的可視區域  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"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <Button  android:id="@+id/showbtn"  android:layout_width="match_parent"  android:layout_height="50dp"  android:gravity="center"  android:text="show" /> <Button  android:id="@+id/hidebtn"  android:layout_width="match_parent"  android:layout_height="50dp"  android:gravity="center"  android:text="hide" /></LinearLayout>

item_layout.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:id="@+id/root" android:orientation="vertical"> <TextView  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"/></LinearLayout>

實現效果如下：