android弹出窗口的实现(PopupWindow)

fmms 8年前

           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>
<?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>
主要是为了实现一个这样的界面:

android弹出窗口的实现(PopupWindow)

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

<?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>
<?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>
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;   }    }
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();      }     }    });   }  }
这样就完成了一个弹出对话框的效果,下面来看一下吧! android弹出窗口的实现(PopupWindow)

再看一张新浪微博的弹出对话框效果:

android弹出窗口的实现(PopupWindow)

转自:http://blog.csdn.net/wangkuifeng0118/article/details/7368157