Android_PopupWindow提示框

<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" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showpopup"
android:text="显示popupwindow" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showpopup_two"
android:text="显示popupwindow(三个参数)" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showpopup_three"
android:text="显示popupwindow(showAtLocation)" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="200dp"
android:layout_height="200dp"

android:orientation="vertical" >

<Button
android:id="@+id/toast"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="弹出吐司" />

<Button
android:id="@+id/close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="关闭" />

</LinearLayout>

package com.bwei.day_11_popupwindow;

import android.app.Activity;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.PopupWindow;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

private PopupWindow popupWindow;

// private View view;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//加载popupwindow
View view = View.inflate(MainActivity.this, R.layout.popupwindow, null);

popupWindow = new PopupWindow(view,
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
// 设置popupwindow点击窗体外可以消失;但必须要给popupwindow设置背景
popupWindow.setOutsideTouchable(true);
// 给popupwindow设置背景颜色
popupWindow.setBackgroundDrawable(new ColorDrawable(Color.YELLOW));
//监听
Button toast = (Button) view.findViewById(R.id.toast);
Button close = (Button) view.findViewById(R.id.close);
toast.setOnClickListener(this);
close.setOnClickListener(this);
}
//3种显示
public void showpopup(View v) {

System.out.println(popupWindow.isShowing());
// 判断popupwindow是否在显示
if (!popupWindow.isShowing()) {
popupWindow.showAsDropDown(v);

}

}

public void showpopup_two(View v) {
// 判断popupwindow是否在显示
if (!popupWindow.isShowing()) {
// 参数一:popupwindow显示时的参照控件,参数二:X轴的偏移量,参数三:Y轴的偏移量
popupWindow.showAsDropDown(v, 100, 200);
}

}

public void showpopup_three(View v) {
// 参数一:popupwindow的父窗体.参数二:popupwindow显示时的相对位置,参数三:X轴的偏移量,参数四:Y轴的偏移量
popupWindow.showAtLocation(v, Gravity.LEFT, 0, 0);

}
//popupWindow内部
@Override
public void onClick(View v) {
switch (v.getId()) {
// 弹出吐司
case R.id.toast:
Toast.makeText(MainActivity.this, "点击popupwindow内部按钮弹出的", 1).show();
break;
// 关闭popupwindow
case R.id.close:
// 关闭popupwindows
popupWindow.dismiss();
break;

}
}

}