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 {

@Override
protected 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 {

@Override
protected 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 {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

@Override
public 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;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
int 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);
}

}