編輯:關於Android編程
本文較為詳細的總結分析了Android編程下拉菜單spinner用法。分享給大家供大家參考,具體如下:
Spinner控件也是一種列表類型的控件,它的繼承關系如下:
java.lang.Object
↳ android.view.View
↳ android.view.ViewGroup
↳ android.widget.AdapterView<Textends android.widget.Adapter>
↳ android.widget.AbsSpinner
↳ android.widget.Spinner
android.widget.Spinner繼承了android.view.ViewGroup類。
在Android的UI開發中,Spinner(下拉列表)總是可以用到的,一個簡單的自定義Spinner制作我們只需要記住這重要的五步,一個Spinner就可以應用而生了。
(1)新建一個android工程,名稱為Spinner。同時建一個Activity,名稱為SpinnerActivity。
(2)修改res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id = "@+id/TextView_city" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "所在城市:" /> <!-- 定義一個城市信息下拉菜單--> <Spinner android:id = "@+id/Spinner_city" android:layout_width = "wrap_content" android:layout_height ="wrap_content" > </Spinner > </LinearLayout>
(3)SpinnerActivity.java 代碼
package cn.com; 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.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; public class SpinnerActivity 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; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //第一步:添加一個下拉列表項的list,這裡添加的項就是下拉列表的菜單項 list.add("北京"); list.add("上海"); list.add("深圳"); list.add("福州"); list.add("廈門"); myTextView = (TextView)findViewById(R.id.TextView_city); mySpinner = (Spinner)findViewById(R.id.Spinner_city); //第二步:為下拉列表定義一個適配器,這裡就用到裡前面定義的list。 adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, list); //第三步:為適配器設置下拉列表下拉時的菜單樣式。 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //第四步:將適配器添加到下拉列表上 mySpinner.setAdapter(adapter); //第五步:為下拉列表設置各種事件的響應,這個事響應菜單被選中 mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){ public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub /* 將所選mySpinner 的值帶入myTextView 中*/ myTextView.setText("您選擇的是:"+ adapter.getItem(arg2)); /* 將mySpinner 顯示*/ arg0.setVisibility(View.VISIBLE); } public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub myTextView.setText("NONE"); arg0.setVisibility(View.VISIBLE); } }); /*下拉菜單彈出的內容選項觸屏事件處理*/ mySpinner.setOnTouchListener(new Spinner.OnTouchListener(){ public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub /** * */ return false; } }); /*下拉菜單彈出的內容選項焦點改變事件處理*/ mySpinner.setOnFocusChangeListener(new Spinner.OnFocusChangeListener(){ public void onFocusChange(View v, boolean hasFocus) { // TODO Auto-generated method stub } }); } }
運行結果如下圖所示:
補充:Spinner控件用法示例2則
用法1:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context="com.example.mars_2100_spinner.MainActivity" tools:ignore="MergeRootFrame" > <Spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/SpinnerId"/> </LinearLayout>
package com.example.mars_2100_spinner; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.Toast; import android.os.Build; public class MainActivity extends ActionBarActivity { private static final String[] m_arr = {"第一組","第二組","第三組"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Spinner _spin = (Spinner)findViewById(R.id.SpinnerId); ArrayAdapter<String> ada = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m_arr); ada.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); _spin.setAdapter(ada); _spin.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){ public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3){ dispToast("選擇的是"+m_arr[arg2]); arg0.setVisibility(View.VISIBLE); } public void onNothingSelected(AdapterView<?> arg0){ // } }); /*if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit(); }*/ } public void dispToast(String str){ Toast.makeText(this, str, Toast.LENGTH_SHORT).show(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } } }
用法2:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context="com.example.mars_2100_spinner.MainActivity" tools:ignore="MergeRootFrame" > <Spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/SpinnerId2"/> <TextView android:id="@+id/textView1" android:layout_width="fill_parent" android:layout_height="wrap_content"/> <Spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/SpinnerId3"/> <TextView android:id="@+id/textView2" android:layout_width="fill_parent" android:layout_height="wrap_content"/> </LinearLayout>
package com.example.mars_2100_spinner; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBar; import android.support.v4.app.Fragment; import android.app.Activity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; import android.os.Build; public class Main02Activity extends Activity { static final String[] CONSTELLATIONS = new String[] { "白羊座", "金牛座", "雙子座", "巨蟹座", "獅子座", "處女座", "天枰座", "天蠍座", "射手座", "魔蠍座", "水瓶座", "雙魚座" }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main02); final TextView txt2 = (TextView) findViewById(R.id.textView1); Spinner s1 = (Spinner) findViewById(R.id.SpinnerId2); final ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.planets_array, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); s1.setAdapter(adapter); s1.setPrompt("測試"); s1.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { txt2.setText(adapter.getItem(position).toString()); } @Override public void onNothingSelected(AdapterView<?> parent) { txt2.setText("沒選中的"); } }); final TextView txt4 = (TextView) findViewById(R.id.textView2); Spinner s2 = (Spinner) findViewById(R.id.SpinnerId3); ArrayAdapter<CharSequence> adapterC = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, CONSTELLATIONS); adapterC.setDropDownViewResource(android.R.layout.simple_spinner_item); s2.setAdapter(adapterC); s2.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { txt4.setText(CONSTELLATIONS[position]); } public void onNothingSelected(AdapterView<?> parent) { txt4.setText("沒選中的"); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main02, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } /** * A placeholder fragment containing a simple view. */ public static class PlaceholderFragment extends Fragment { public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main02, container, false); return rootView; } } }
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">Mars_2100_Spinner</string> <string name="hello_world">Hello world!</string> <string name="action_settings">Settings</string> <string-array name="planets_array"> <item>Mercury</item> <item>Venus</item> <item>Earth</item> <item>Mars</item> <item>Jupiter</item> <item>Saturn</item> <item>Uranus</item> <item>Neptune</item> </string-array> <string name="title_activity_main02">Main02Activity</string> </resources>
希望本文所述對大家Android程序設計有所幫助。
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