Android高手进阶教程(十)之----Android PopupWindow的使用!!!

大家好，我们这一节讲的是Android PopupWindow的使用! 在我理解其实PopupWindow其实类似于一个不能动的Widget(仅从显示效果来说!)

它是浮在别的窗口之上的.

下面我将给大家做一个简单的Demo，类似于音乐播放器的Widget的效果，点击Button的时候出来PopupWindow,首先我们看一下效果图:





下面是核心代码:

[java]
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package com.android.tutor;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup.LayoutParams;

import android.widget.Button;

import android.widget.PopupWindow;

public class PopupWindowDemo
extends Activity implements OnClickListener{

private Button btn;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

btn = (Button)findViewById(R.id.btn);
btn.setOnClickListener(this);

}
@Override
public void onClick(View v) {

Context mContext = PopupWindowDemo.this;

if (v.getId() == R.id.btn) {

LayoutInflater mLayoutInflater = (LayoutInflater) mContext
.getSystemService(LAYOUT_INFLATER_SERVICE);
View music_popunwindwow = mLayoutInflater.inflate(
R.layout.music_popwindow, null);

PopupWindow mPopupWindow = new PopupWindow(music_popunwindwow, LayoutParams.FILL_PARENT,

LayoutParams.WRAP_CONTENT);

mPopupWindow.showAtLocation(findViewById(R.id.main), Gravity.RIGHT|Gravity.BOTTOM,
0, 0);

}
}
}

Android 高手进阶教程(九)之----Android Handler的使用!! 看一看，加深了解:

下面是核心代码:

[java]
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package com.android.tutor;

import java.util.Timer;

import java.util.TimerTask;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup.LayoutParams;

import android.widget.PopupWindow;

public class PopupWindowDemo
extends Activity{
private Handler mHandler =
new Handler(){

public void handleMessage(Message msg) {

switch (msg.what) {
case 1:

showPopupWindow();
break;
}
};
};

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//create the timer
Timer timer = new Timer();

timer.schedule(new initPopupWindow(),
100);
}

private class initPopupWindow
extends TimerTask{
@Override
public void run() {

Message message = new Message();

message.what = 1;
mHandler.sendMessage(message);

}
}

public void showPopupWindow() {

Context mContext = PopupWindowDemo.this;

LayoutInflater mLayoutInflater = (LayoutInflater) mContext

.getSystemService(LAYOUT_INFLATER_SERVICE);
View music_popunwindwow = mLayoutInflater.inflate(
R.layout.music_popwindow, null);

PopupWindow mPopupWindow = new PopupWindow(music_popunwindwow,

LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
mPopupWindow.showAtLocation(findViewById(R.id.main), Gravity.CENTER,
0, 0);

}
}

package com.android.tutor;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;
public class PopupWindowDemo extends Activity{
private Handler mHandler = new Handler(){

public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
showPopupWindow();
break;
}
};
};

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

//create the timer
Timer timer = new Timer();
timer.schedule(new initPopupWindow(), 100);
}

private class initPopupWindow extends TimerTask{
@Override
public void run() {

Message message = new Message();
message.what = 1;
mHandler.sendMessage(message);

}
}

public void showPopupWindow() {
Context mContext = PopupWindowDemo.this;
LayoutInflater mLayoutInflater = (LayoutInflater) mContext
.getSystemService(LAYOUT_INFLATER_SERVICE);
View music_popunwindwow = mLayoutInflater.inflate(
R.layout.music_popwindow, null);
PopupWindow mPopupWindow = new PopupWindow(music_popunwindwow,
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
mPopupWindow.showAtLocation(findViewById(R.id.main), Gravity.CENTER, 0, 0);
}
}

效果如下图:



这样就可以初始化PopupWindow了,呵呵，这一节的布局文件有点多，如果大家想要源码的话，留下你们的Email,我会尽快发送给大家的

，今天就到这里，大家有什么不明白的欢迎留言!!!谢谢~

要源码的太多，我快崩溃了，所以上传了。下载地址: http://d.download.csdn.net/down/2871531/Android_Tutor