本文实例为大家分享了Android下拉展示条目的具体代码,供大家参考,具体内容如下
布局文件
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<? xml version = "1.0" encoding = "utf-8" ?> < RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:id = "@+id/activity_main" android:layout_width = "match_parent" android:layout_height = "match_parent" android:paddingBottom = "@dimen/activity_vertical_margin" android:paddingLeft = "@dimen/activity_horizontal_margin" android:paddingRight = "@dimen/activity_horizontal_margin" android:paddingTop = "@dimen/activity_vertical_margin" android:background = "#000000" tools:context = "com.example.a2_.MainActivity" > < EditText android:id = "@+id/et_input" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:textColor = "#fff" android:text = "请输入内容" /> < ImageButton android:padding = "6dp" android:background = "@null" android:layout_alignRight = "@id/et_input" android:id = "@+id/ib" android:src = "@mipmap/down_arrow" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> </ RelativeLayout > |
条目布局文件
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<? 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 = "wrap_content" android:padding = "5dp" android:descendantFocusability = "blocksDescendants" android:orientation = "horizontal" > < ImageView android:src = "@mipmap/user" android:id = "@+id/iv_user" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> < TextView android:layout_weight = "1" android:id = "@+id/tv_data" android:text = "100" android:textColor = "#000000" android:gravity = "center_horizontal" android:layout_width = "0dp" android:layout_height = "wrap_content" /> < ImageButton android:background = "@null" android:src = "@mipmap/delete" android:id = "@+id/iv_delete" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> </ LinearLayout > |
核心代码
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package com.example.a2_; import android.graphics.drawable.ColorDrawable; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.EditText; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.ListView; import android.widget.PopupWindow; import android.widget.TextView; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { private EditText et_input; private PopupWindow popupWindow; private ListView lv_list; private ArrayList<String> data; private MyAdapter myAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化控件 et_input = (EditText) findViewById(R.id.et_input); ImageButton ib = (ImageButton) findViewById(R.id.ib); //初始化数据源 initData(); //创建一个listView lv_list = new ListView( this ); //给listview设置背景 lv_list.setBackgroundResource(R.mipmap.listview_background); //给listview设置适配器 myAdapter = new MyAdapter(); lv_list.setAdapter(myAdapter); //给listview设置条目点击事件 lv_list.setOnItemClickListener( new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { //当点击到一个条目的时候,就把这个条目的内容显示在输入框中 et_input.setText(data.get(position)); popupWindow.dismiss(); } }); //给按钮设置点击事件 ib.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { //当点击下拉按钮时,显示列表选项 showPopup(); } }); } //初始化数据 private void initData() { //创建一个集合,用来存储数据 data = new ArrayList<>(); //通过for循环创建数据 for ( int i = 1 ;i< 20 ;i++){ data.add( 100 +i+ "" ); } } //显示下拉的列表条目 private void showPopup() { //创建PopupWindow对象 popupWindow = new PopupWindow(lv_list,et_input.getWidth(), 500 , true ); //为了在点击列表条目之外的区域能够让列表条目隐藏,为列表条目设置一个背景 popupWindow.setBackgroundDrawable( new ColorDrawable()); //让列表条目显示 并指定在哪个列表条目下展示 popupWindow.showAsDropDown(et_input); } //创建一个适配器 class MyAdapter extends BaseAdapter{ @Override public int getCount() { return data.size(); } @Override public String getItem( int position) { return data.get(position); } @Override public long getItemId( int position) { return position; } @Override public View getView( final int position, View convertView, ViewGroup parent) { //判断convertView是否为空 if (convertView== null ){ convertView = View.inflate(MainActivity. this ,R.layout.lv_item, null ); } //找到控件 TextView tv_data = (TextView) convertView.findViewById(R.id.tv_data); ImageView iv_delete = (ImageView) convertView.findViewById(R.id.iv_delete); //设置点击事件 iv_delete.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { //删除集合里面的数据 data.remove(position); //刷新页面 myAdapter.notifyDataSetChanged(); } }); //获取数据 String data = getItem(position); //设置数据 tv_data.setText(data); return convertView; } } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/qq_32890771/article/details/72781993