Android Spinner
16lz
2021-01-23
- 新建一个Android工程,名字为SpinnerActy。修改layout下的main.xml,添加一个Textview和一个Spinner,文件内容如下:
<?xml version="1.0" encoding=”utf-8″?> <LinearLayout android:id= "@+id/widget28" android:layout_width= "fill_parent" android:layout_height= "fill_parent" android:orientation= "vertical" xmlns:android= "http://schemas.android.com/apk/res/android" > <TextView android:id= "@+id/TextView_Show" android:layout_width= "fill_parent" android:layout_height= "wrap_content" android:text= "你选择的是" android:textSize= "25sp" > </TextView> <Spinner android:id= "@+id/spinner_City" android:layout_width= "fill_parent" android:layout_height= "wrap_content" > </Spinner> <!– 定义一个下拉菜单–> </LinearLayout>
- 修改你的SpinnerActy类,在这里我们就要记住五步来自定义一个Spinner了,完整代码及五步注释如下:
package com . xtlh . spinner; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; public class SpinnerActy extends Activity { /** Called when the activity is first created. */ private List<String> list = new ArrayList<String>(); private TextView myTextView; private Spinner mySpinner; private ArrayAdapter<String> adapter; private Animation myAnimation; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //第一步:添加一个下拉列表项的list,这里添加的项就是下拉列表的菜单项 list.add("北京"); list.add("上海"); list.add("深圳"); list.add("南京"); list.add("重庆"); myTextView = (TextView)findViewById(R.id.TextView_Show); mySpinner = (Spinner)findViewById(R.id.spinner_City); //第二步:为下拉列表定义一个适配器,这里就用到里前面定义的list。 adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, list); //第三步:为适配器设置下拉列表下拉时的菜单样式。 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //第四步:将适配器添加到下拉列表上 mySpinner.setAdapter(adapter); //第五步:为下拉列表设置各种事件的响应,这个事响应菜单被选中 mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){ public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub /* 将所选mySpinner 的值带入myTextView 中*/ myTextView.setText("您选择的是:"+ adapter.getItem(arg2)); /* 将mySpinner 显示*/ arg0.setVisibility(View.VISIBLE); } public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub myTextView.setText("NONE"); arg0.setVisibility(View.VISIBLE); } }); /*下拉菜单弹出的内容选项触屏事件处理*/ mySpinner.setOnTouchListener(new Spinner.OnTouchListener(){ public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub /* 将mySpinner 隐藏,不隐藏也可以,看自己爱好*/ v.setVisibility(View.INVISIBLE); return false; } }); /*下拉菜单弹出的内容选项焦点改变事件处理*/ mySpinner.setOnFocusChangeListener(new Spinner.OnFocusChangeListener(){ public void onFocusChange(View v, boolean hasFocus) { // TODO Auto-generated method stub v.setVisibility(View.VISIBLE); } }); } }
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