Android笔记 简单demo Spinner AutoCompleteTextView Menu

demo1 spinner

1布局

<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"    tools:context=".MainActivity" >    <Spinner        android:id="@+id/spinner"        android:layout_width="fill_parent"        android:layout_height="wrap_content" /></RelativeLayout>

2MainActivity

package com.example.a106spinner;import android.os.Bundle;import android.app.Activity;import android.widget.ArrayAdapter;import android.widget.Spinner;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Spinner spinner = (Spinner) findViewById(R.id.spinner);ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item);adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);adapter.add("出售时间");adapter.add("购买时间");adapter.add("交换时间");spinner.setAdapter(adapter);}}

demo2AutoCompleteTextView

        xml文件有一项属性android:completionThreshold="1" 代表输入一个字就提示

1布局

<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"    tools:context=".MainActivity" >    <AutoCompleteTextView        android:id="@+id/name"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:completionThreshold="1" /></RelativeLayout>

2MainActivity

package com.example.a106autocompletetextview;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.widget.ArrayAdapter;import android.widget.AutoCompleteTextView;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);String[] names = { "老张", "老李", "王翔", "王五", "abcc", "abd", "aaa" };AutoCompleteTextView nameText = (AutoCompleteTextView) findViewById(R.id.name);ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line, names);nameText.setAdapter(adapter);}}

若想实现多条信息提示 可更改控件名为MultiAutoCompleteTextView（未实验）

3demo3Menu

1res/menu下menu.xml(新建的 或者main.xml重命名)

<menu xmlns:android="http://schemas.android.com/apk/res/android" >    <item        android:id="@+id/item1"        android:title="我是菜单1">    </item>    <item        android:id="@+id/item2"        android:title="我是菜单2">    </item>    <item        android:id="@+id/item3"        android:title="我是菜单3">    </item></menu>

2MainActivity

package com.example.a106menu;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.MenuItem;import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.menu, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// TODO Auto-generated method stubint id = item.getItemId();switch (id) {case R.id.item1:Toast.makeText(this, "条目一被点击了", Toast.LENGTH_SHORT).show();break;case R.id.item2:Toast.makeText(this, "条目二被点击了", Toast.LENGTH_SHORT).show();break;case R.id.item3:Toast.makeText(this, "条目三被点击了", Toast.LENGTH_SHORT).show();break;default:break;}return super.onOptionsItemSelected(item);}}