android popupwindow 实现

android弹出窗口的实现（PopupWindow)

最近看到新浪微博顶部栏的微博分组效果很炫，从网上查了一些资料明白原来是用PopupWindow实现的，

今天自己也写了一个例子实现了这种效果，希望对大家有帮助.

PopupWindow就是弹出窗口的意思，类似windows下面的开始按钮。PopupWindow可以实现浮层效果，而且可以自定义显示位置，

出现和退出时的动画.

首先定义新浪微博的顶部栏,title_two_button.xml和main.xml

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

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="wrap_content" >

 

<TextView

android:id="@+id/tvtitle"

android:layout_width="fill_parent"

android:layout_height="45dip"

android:background="@drawable/search_bg"

android:gravity="center"

android:text="天堂没有路"

android:textColor="@color/black"

android:textSize="25dip" />

 

<Button

android:id="@+id/btn_title_left"

android:layout_width="50dip"

android:layout_height="35dip"

android:layout_gravity="center_vertical"

android:background="@drawable/title_button"

android:textColor="@color/white" />

 

<Button

android:id="@+id/btn_title_right"

android:layout_width="50dip"

android:layout_height="35dip"

android:layout_gravity="right"

android:layout_marginRight="2dip"

android:layout_marginTop="4dip"

android:background="@drawable/title_button2"

android:textColor="@color/white" />

 

</FrameLayout>

 

[html] view plaincopy

 

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@android:color/white"

android:orientation="vertical" >

 

<include

android:id="@+id/top_title"

layout="@layout/title_two_button" />

 

</LinearLayout>
复制代码主要是为了实现一个这样的界面：

接下来定义弹出对话框的布局文件group_list.xml和group_item_view.xml

[html] view plaincopy

 

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@drawable/group_bg"

android:orientation="vertical"

>

 

 

<ImageView

android:id="@+id/iv_group_list_bg_divider"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:background="@drawable/group_divider"

/>

 

<ListView

android:id="@+id/lvGroup"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:divider="@drawable/group_divider"

/>

 

</LinearLayout>
复制代码

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@drawable/group_bg"

android:orientation="vertical"

>

 

 

<ImageView

android:id="@+id/iv_group_list_bg_divider"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:background="@drawable/group_divider"

/>

 

<ListView

android:id="@+id/lvGroup"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:divider="@drawable/group_divider"

/>

 

</LinearLayout>
复制代码
自定义一个适配器：GroupAdapter

import java.util.List;

 

import cn.com.karl.popwindow.R;

 

 

import android.content.Context;

import android.graphics.Color;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;

 

public class GroupAdapter extends BaseAdapter {

 

private Context context;

 

private List<String> list;

 

public GroupAdapter(Context context, List<String> list) {

 

this.context = context;

this.list = list;

 

}

 

@Override

public int getCount() {

return list.size();

}

 

@Override

public Object getItem(int position) {

 

return list.get(position);

}

 

@Override

public long getItemId(int position) {

return position;

}

 

@Override

public View getView(int position, View convertView, ViewGroup viewGroup) {

 

 

ViewHolder holder;

if (convertView==null) {

convertView=LayoutInflater.from(context).inflate(R.layout.group_item_view, null);

holder=new ViewHolder();

 

convertView.setTag(holder);

 

holder.groupItem=(TextView) convertView.findViewById(R.id.groupItem);

 

}

else{

holder=(ViewHolder) convertView.getTag();

}

holder.groupItem.setTextColor(Color.BLACK);

holder.groupItem.setText(list.get(position));

 

return convertView;

}

 

static class ViewHolder {

TextView groupItem;

}

 

}
复制代码
最后是我要实现弹出对话框的核心类PoupWindowDemoActivity

import java.util.ArrayList;

import java.util.List;

 

 

import cn.com.karl.adapter.GroupAdapter;

 

import android.app.Activity;

import android.content.Context;

import android.graphics.drawable.BitmapDrawable;

import android.os.Bundle;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.Window;

import android.view.WindowManager;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ListView;

import android.widget.PopupWindow;

import android.widget.TextView;

import android.widget.Toast;

 

public class PoupWindowDemoActivity extends Activity {

 

private PopupWindow popupWindow;

 

private ListView lv_group;

 

private View view;

 

private View top_title;

 

private TextView tvtitle;

 

private List<String> groups;

 

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

this.requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.main);

 

top_title = this.findViewById(R.id.top_title);

 

tvtitle = (TextView) top_title.findViewById(R.id.tvtitle);

 

tvtitle.setText("天堂没有路");

 

tvtitle.setOnClickListener(new View.OnClickListener() {

 

@Override

public void onClick(View v) {

showWindow(v);

}

});

 

}

 

 

private void showWindow(View parent) {

 

if (popupWindow == null) {

LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

 

view = layoutInflater.inflate(R.layout.group_list, null);

 

lv_group = (ListView) view.findViewById(R.id.lvGroup);

// 加载数据

groups = new ArrayList<String>();

groups.add("全部");

groups.add("我的微博");

groups.add("好友");

groups.add("亲人");

groups.add("同学");

groups.add("朋友");

groups.add("陌生人");

 

GroupAdapter groupAdapter = new GroupAdapter(this, groups);

lv_group.setAdapter(groupAdapter);

// 创建一个PopuWidow对象

popupWindow = new PopupWindow(view, 300, 350);

}

 

// 使其聚集

popupWindow.setFocusable(true);

// 设置允许在外点击消失

popupWindow.setOutsideTouchable(true);

 

// 这个是为了点击“返回Back”也能使其消失，并且并不会影响你的背景

popupWindow.setBackgroundDrawable(new BitmapDrawable());

WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);

// 显示的位置为:屏幕的宽度的一半-PopupWindow的高度的一半

int xPos = windowManager.getDefaultDisplay().getWidth() / 2

- popupWindow.getWidth() / 2;

Log.i("coder", "xPos:" + xPos);

 

popupWindow.showAsDropDown(parent, xPos, 0);

 

lv_group.setOnItemClickListener(new OnItemClickListener() {

 

@Override

public void onItemClick(AdapterView<?> adapterView, View view,

int position, long id) {

 

Toast.makeText(PoupWindowDemoActivity.this,

groups.get(position), 1000)

.show();

 

if (popupWindow != null) {

popupWindow.dismiss();

}

}

});

}

}
复制代码

这样就完成了一个弹出对话框的效果，下面来看一下吧！

再看一张新浪微博的弹出对话框效果：

已经完成，我们可以把这项功能加入自己的做的新浪微博里，为自己的应用增添点特色色彩吧！

#Android

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