popupwindow的学习

源地址：http://blog.csdn.net/xyz_lmn/article/details/6906286

自定义的一个弹窗，学习学习。

MainActivity.java:

package com.example.li.popupwindow;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.PopupWindow;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

View view;
PopupWindow pop;
Button btnShowAsDrawDown;
Button btnShowAsDrawDown1;
Button btnShowAtLocation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.popup_activity);
btnShowAsDrawDown = (Button) findViewById(R.id.btnShowAsDrawDown);
btnShowAsDrawDown.setOnClickListener(this);
btnShowAsDrawDown1 = (Button) findViewById(R.id.btnShowAsDrawDown1);
btnShowAsDrawDown1.setOnClickListener(this);
btnShowAtLocation = (Button) findViewById(R.id.btnShowAt);
btnShowAtLocation.setOnClickListener(this);
initPopupWindow();
}

private void initPopupWindow() {
view = this.getLayoutInflater().inflate(R.layout.popup_window, null);
pop = new PopupWindow(view, ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT
);
pop.setOutsideTouchable(true);
Button btnpop = (Button) view.findViewById(R.id.btn_pop);
btnpop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
pop.dismiss();
}
});
}

@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btnShowAsDrawDown:
if(pop.isShowing()){
pop.dismiss();
}else{
pop.showAsDropDown(v);
}
break;
case R.id.btnShowAsDrawDown1:
if(pop.isShowing()){
pop.dismiss();
}else{
pop.showAsDropDown(v, 0, -160);
}
break;
default:
if(pop.isShowing()){
pop.dismiss();
}else{
pop.showAtLocation(findViewById(R.id.main),
Gravity.CENTER_HORIZONTAL, 0, 0
);
}
break;
}
}
}

popup_activity.xml:

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

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="pop demo!"
/>

<Button
android:id="@+id/btnShowAsDrawDown"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Show as drawndown(one parameter)" />

<Button
android:id="@+id/btnShowAsDrawDown1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Show as drawndown(three parameters)" />

<Button
android:id="@+id/btnShowAt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Show At Location" />

</LinearLayout>

popup_window.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="match_parent"
android:orientation="horizontal"
android:background="#a00ddddd"
android:gravity="center"
>

<Button
android:id="@+id/btn_pop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dip"
android:text="Close"
/>

<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

</LinearLayout>