147.泡泡窗实现下拉菜单条

功能描述：点击下拉按钮，显示出所有的条目，有删除和点击功能，点击后将条目显示。

注意：泡泡窗默认是没有焦点的。要让泡泡窗获取到焦点。假如listview的item中有Button，ImageButton,CheckBox等会强制获取焦点的view 此时，listview的item无法获取焦点，从而无法被点击 解决方法：给item的根布局增加以下属性 android:descendantFocusability="blocksDescendants"设置之后，Button获取焦点，item中其他控件也可以获取焦点,如果文本的文字过多，会被后面的图标盖住，首先设置单行android:singleLine="true"再设置右边距就盖不住android:padding="40dp"

需要添加下面三项

//让泡泡窗额度条目获取到焦点popupWindow.setFocusable(true);//设置背景图popupWindow.setBackgroundDrawable(new BitmapDrawable());popupWindow.setOutsideTouchable(true);

主布局文件activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#22000000"    tools:context=".MainActivity" >    <RelativeLayout         android:layout_marginTop="40dp"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        >    <EditText        android:id="@+id/et"        android:singleLine="true"        android:padding="40dp"        android:layout_width="300dp"        android:layout_height="40dp"        />    <ImageView         android:layout_width="wrap_content"        android:layout_height="40dp"        android:id="@+id/iv_select"        android:layout_centerVertical="true"        android:background="@drawable/ic_launcher"        android:layout_alignRight="@id/et"        /></RelativeLayout></RelativeLayout>

每一个条目的布局文件item_list.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:padding="5dp"    android:orientation="horizontal" >        <TextView         android:layout_width="0dp"    android:layout_height="wrap_content"    android:drawableLeft="@drawable/ic_launcher"    android:gravity="center_vertical"    android:drawablePadding="3dp"    android:text="123"    android:id="@+id/tv_number"    android:layout_weight="1"        />    <ImageView         android:id="@+id/iv_delete"        android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:background="@drawable/ic_launcher"        />    </LinearLayout>

逻辑代码MainActivity.java

package com.ldw.select;import java.util.ArrayList;import android.app.Activity;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.EditText;import android.widget.ImageView;import android.widget.ListView;import android.widget.PopupWindow;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener{private ImageView iv_select;private EditText et;private ArrayList<String> list = new ArrayList<String>();private TextView tv_number;private ImageView iv_delete;private ListView listView;private PopupWindow popupWindow;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                        initView();        initListener();          initData();            }private void initView() {setContentView(R.layout.activity_main);    iv_select = (ImageView) findViewById(R.id.iv_select);        et = (EditText) findViewById(R.id.et);}        private void initListener() {    iv_select.setOnClickListener(this);}        //集合中添加数据private void initData() {for(int i = 0; i< 20; i++){list.add(1340000000 + i + "");}initListView();}//初始化列表private void initListView(){listView = new ListView(this);//设置listView的背景图listView.setBackgroundResource(R.drawable.ic_launcher);//让listView的滚动条不可见listView.setVerticalScrollBarEnabled(false);MyAdapter adapter = new MyAdapter();listView.setAdapter(adapter);listView.setOnItemClickListener(new OnItemClickListener(){@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {et.setText(list.get(position));//关闭泡泡窗popupWindow.dismiss();}});}//泡泡窗实现点击显示列表,泡泡窗默认是不获取焦点的private void showNumberList(){if(popupWindow == null){//泡泡窗的填充,设置宽高popupWindow = new PopupWindow(listView, et.getWidth(), 300);}//让泡泡窗额度条目获取到焦点popupWindow.setFocusable(true);//设置背景图popupWindow.setBackgroundDrawable(new BitmapDrawable());popupWindow.setOutsideTouchable(true);//第一个参数是依附哪一个参数下,x轴，y轴的偏移量，相对于第一个参数的左下角的位置popupWindow.showAsDropDown(et, 0, 0);}@Overridepublic void onClick(View v){    switch (v.getId()){    case R.id.iv_select:    //点击弹出列表    showNumberList();    break;    }    }//listView填充class MyAdapter extends BaseAdapter{@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return 0;}@Overridepublic View getView(final int position, View convertView, ViewGroup parent) {final View view = View.inflate(MainActivity.this, R.layout.item_list, null);tv_number = (TextView) view.findViewById(R.id.tv_number);iv_delete = (ImageView) view.findViewById(R.id.iv_delete);tv_number.setText(list.get(position));//删除按键iv_delete.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v) {//删除条目list.remove(position);//更新页面notifyDataSetChanged();//根据当前条目的个数设置，当前条目的高度int listViewHeight = list.size() * view.getHeight();if(listViewHeight > 300){listViewHeight = 300;}else{listViewHeight = listViewHeight;}//更新泡泡窗的高度popupWindow.update(et.getWidth(), listViewHeight);//删除完了，泡泡窗小消失if(list.size() == 0){popupWindow.dismiss();//下拉条消失iv_select.setVisibility(View.GONE);}}});return view;}}}