Android学习（三）Spinner实现

1.创建一个spinner对象

2.创建一个适配器 adapter (spinner)

3.adapter选择spinner样式

4.spinner得到adapter

5.spinner添加OnItemSelectedListener

6.spinner设置SetOnTouchListener

SpinnerActivity.java

package com.luwenjie.android;
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
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 SpinnerActivity extends Activity{
private static final String[] countriesStr = {"北京","上海","天津","重庆","南京"};
private TextView tv;
private Spinner spinner;
private ArrayAdapteradapter;
private Animation myAnimation;
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.spinner);
tv = (TextView)findViewById(R.id.spText);
spinner = (Spinner)findViewById(R.id.spinner);
adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item,countriesStr);
//自定义下拉菜单样式
adapter.setDropDownViewResource(R.layout.myspinner_dropdown);
//将Array添加Spinner对象中
spinner.setAdapter(adapter);
//将spinner添加OnItemSelectedListener
spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> arg0, View view,
int position, long id) {
//将所选spinner的值带入tv中
tv.setText("选择的是:" + countriesStr[position]);
//view.setVisibility(View.VISIBLE);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
//取得Animation 定义在res/anim目录下
myAnimation = AnimationUtils.loadAnimation(this, R.anim.my_anim);
//将spinner添加OntouchListener
spinner.setOnTouchListener(new Spinner.OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
//将spinner 运行 animation
spinner.startAnimation(myAnimation);
//将spinner隐藏
//spinner.setVisibility(View.INVISIBLE);
return false;
}
});
spinner.setOnFocusChangeListener(new Spinner.OnFocusChangeListener(){
@Override
public void onFocusChange(View v, boolean hasFocus) {
// TODO Auto-generated method stub
}
});
}
}

res/anim/my_anim.xml

                                    <?xml version="1.0" encoding="utf-8"?> 
                    <set 
                        xmlns:android="http://schemas.android.com/apk/res/android"> 
                        <translate  
                            android:fromXDelta="0" 
                            android:toXDelta="-100%p" 
                            android:duration="300" 
                            /> 
                        <alpha  
                            android:fromAlpha="1.0" 
                            android:toAlpha="0.0" 
                            android:duration="300" 
                            /> 
                    set>

res/layout/spinner.xml

                                    <?xml version="1.0" encoding="utf-8"?> 
                    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
                        android:layout_width="fill_parent" 
                        android:layout_height="fill_parent" 
                        android:orientation="vertical" > 
                     
                       <TextView 
                           android:id="@+id/spText" 
                           android:layout_width="fill_parent"    
                           android:layout_height="wrap_content" 
                           /> 
                        
                       <Spinner  
                           android:id="@+id/spinner" 
                           android:layout_width="wrap_content" 
                           android:layout_height="wrap_content" 
                           /> 
                        
                         
                    LinearLayout>

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