android彈出窗口的實現（PopupWindow） – Android移動開發技術文章_手機開發 Android移動開發教學課程

最近看到新浪微博頂部欄的微博分組效果很炫，從網上查瞭一些資料明白原來是用PopupWindow實現的，今天自己也寫瞭一個例子實現瞭這種效果，希望對大傢有幫助。

PopupWindow就是彈出窗口的意思，類似windows下面的開始按鈕。PopupWindow可以實現浮層效果，而且可以自定義顯示位置，出現和退出時的動畫.

首先定義新浪微博的頂部欄,title_two_button.xml和main.xml

       [html] <?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="天堂沒有路"
        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>
<?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" >

</FrameLayout>[html] <?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>
<?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" >

</LinearLayout>
主要是為瞭實現一個這樣的界面：

接下來定義彈出對話框的佈局文件group_list.xml和group_item_view.xml

[html] <?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_pider"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/group_pider"
         />

    <ListView
        android:id="@+id/lvGroup"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:pider="@drawable/group_pider"
          />

</LinearLayout>
<?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"
     >

</LinearLayout>
[html] <?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_pider"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/group_pider"
         />

    <ListView
        android:id="@+id/lvGroup"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:pider="@drawable/group_pider"
          />

</LinearLayout>
<?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"
     >

</LinearLayout>
自定義一個適配器：GroupAdapter

[html] 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;
    }

}
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;
}

}

最後是我要實現彈出對話框的核心類PoupWindowDemoActivity

[html] 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("天堂沒有路");

        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);
            // 加載數據
            groups = new ArrayList<String>();
            groups.add("全部");
            groups.add("我的微博");
            groups.add("好友");
            groups.add("親人");
            groups.add("同學");
            groups.add("朋友");
            groups.add("陌生人");

            GroupAdapter groupAdapter = new GroupAdapter(this, groups);
            lv_group.setAdapter(groupAdapter);
            // 創建一個PopuWidow對象
            popupWindow = new PopupWindow(view, 300, 350);
        }

        // 使其聚集
        popupWindow.setFocusable(true);
        // 設置允許在外點擊消失
        popupWindow.setOutsideTouchable(true);

        // 這個是為瞭點擊“返回Back”也能使其消失，並且並不會影響你的背景
        popupWindow.setBackgroundDrawable(new BitmapDrawable());
        WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        // 顯示的位置為:屏幕的寬度的一半-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();
                }
            }
        });
    }
}
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("天堂沒有路");

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);
   // 加載數據
   groups = new ArrayList<String>();
   groups.add("全部");
   groups.add("我的微博");
   groups.add("好友");
   groups.add("親人");
   groups.add("同學");
   groups.add("朋友");
   groups.add("陌生人");

   GroupAdapter groupAdapter = new GroupAdapter(this, groups);
   lv_group.setAdapter(groupAdapter);
   // 創建一個PopuWidow對象
   popupWindow = new PopupWindow(view, 300, 350);
  }

  // 使其聚集
  popupWindow.setFocusable(true);
  // 設置允許在外點擊消失
  popupWindow.setOutsideTouchable(true);

  // 這個是為瞭點擊“返回Back”也能使其消失，並且並不會影響你的背景
  popupWindow.setBackgroundDrawable(new BitmapDrawable());
  WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
  // 顯示的位置為:屏幕的寬度的一半-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();
    }
   }
  });
}
}
這樣就完成瞭一個彈出對話框的效果，下面來看一下吧！

再看一張新浪微博的彈出對話框效果：

已經完成，我們可以把這項功能加入自己的做的新浪微博裡，為自己的應用增添點特色色彩吧！

摘自 wangkuifeng0118的專欄

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