功能描述：點擊下拉按鈕，顯示出所有的條目，有刪除和點擊功能，點擊后將條目顯示。
注意：泡泡窗默認是沒有焦點的。要讓泡泡窗獲取到焦點。假如listview的item中有Button，ImageButton,CheckBox等會強制獲取焦點的view 此時，listview的item無法獲取焦點，從而無法被點擊 解決方法：給item的根布局增加以下屬性 Android:descendantFocusability="blocksDescendants"設置之后，Button獲取焦點，item中其他控件也可以獲取焦點,如果文本的文字過多，會被后面的圖標蓋住，首先設置單行android/55993.html">android:singleLine="true"再設置右邊距就蓋不住android:padding="40dp"
需要添加下面三項
//讓泡泡窗額度條目獲取到焦點 popupWindow.setFocusable(true); //設置背景圖 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>
每一個條目的布局文件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>
邏輯代碼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); } //集合中添加數(shù)據(jù) 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); //設置listView的背景圖 listView.setBackgroundResource(R.drawable.ic_launcher); //讓listView的滾動條不可見 listView.setVerticalScrollBarEnabled(false); MyAdapter adapter = new MyAdapter(); listView.setAdapter(adapter); listView.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { et.setText(list.get(position)); //關閉泡泡窗 popupWindow.dismiss(); } }); } //泡泡窗實現(xiàn)點擊顯示列表,泡泡窗默認是不獲取焦點的 private void showNumberList(){ if(popupWindow == null){ //泡泡窗的填充,設置寬高 popupWindow = new PopupWindow(listView, et.getWidth(), 300); } //讓泡泡窗額度條目獲取到焦點 popupWindow.setFocusable(true); //設置背景圖 popupWindow.setBackgroundDrawable(new BitmapDrawable()); popupWindow.setOutsideTouchable(true); //第一個參數(shù)是依附哪一個參數(shù)下,x軸，y軸的偏移量，相對于第一個參數(shù)的左下角的位置 popupWindow.showAsDropDown(et, 0, 0); } @Override public void onClick(View v){ switch (v.getId()){ case R.id.iv_select: //點擊彈出列表 showNumberList(); break; } } //listView填充 class MyAdapter extends BaseAdapter{ @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public 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)); //刪除按鍵 iv_delete.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { //刪除條目 list.remove(position); //更新頁面 notifyDataSetChanged(); //根據(jù)當前條目的個數(shù)設置，當前條目的高度 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); //刪除完了，泡泡窗小消失 if(list.size() == 0){ popupWindow.dismiss(); //下拉條消失 iv_select.setVisibility(View.GONE); } } }); return view; } } } 以上所述是小編給大家介紹的Android仿泡泡窗實現(xiàn)下拉菜單條實例代碼，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對VEVB武林網(wǎng)網(wǎng)站的支持！
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