4.8 自定义下拉菜单模式---Spinner与setDropDownViewResource

 

package com.chaowen;

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 Ex04_08_spinner extends Activity {
	private static final String[] countriesStr =
	  {"北京","上海","天津","广东"};
	  private TextView myTextView;
	  private Spinner mySpinner;
	  private ArrayAdapter<String> adapter;
	  Animation myAnimation;

	  /** Called when the activity is first created. */
	  @Override
	  public void onCreate(Bundle savedInstanceState)
	  {
	    super.onCreate(savedInstanceState);
	    setContentView(R.layout.main);
	    myTextView = (TextView) findViewById(R.id.myTextView);
	    mySpinner = (Spinner) findViewById(R.id.mySpinner);
	    adapter = new ArrayAdapter<String>(this,
	        android.R.layout.simple_spinner_item, countriesStr);
	      //myspinner_dropdown为自定义下拉菜单样式 定义在res/layout目录下
	    adapter.setDropDownViewResource(R.layout.myspinner_dropdown);
	    //将ArrayAdapter添加到Spinner对象中
	    mySpinner.setAdapter(adapter);

	    //将mySpinner添加OnItemSelectedListener
	    mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener()
	    {
	      @Override
	      public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
	          long arg3)
	      {
	         //将所选mySpinnner的值带入myTextview
	        myTextView.setText("选择的是" + countriesStr[arg2]);
	        //将mySpinner显示
	        arg0.setVisibility(View.VISIBLE);
	      }

	      @Override
	      public void onNothingSelected(AdapterView<?> arg0)
	      {
	        // TODO Auto-generated method stub
	      }

	    });

	   //取得Animation定义在res/anim目录
	    myAnimation = AnimationUtils.loadAnimation(this, R.anim.my_anim);

	    //将mySpinner添加OnTouchListener
	    mySpinner.setOnTouchListener(new Spinner.OnTouchListener()
	    {
		@Override
		public boolean onTouch(View v, MotionEvent event) {
			 //将mySpinner运行Animation
	        v.startAnimation(myAnimation);
	         //将mySpinner隐藏
	        v.setVisibility(View.INVISIBLE);
	        return false;
		}

	    });

	    mySpinner.setOnFocusChangeListener(new Spinner.OnFocusChangeListener()
	    {

	      @Override
	      public void onFocusChange(View v, boolean hasFocus)
	      {
	        // TODO Auto-generated method stub

	      }

	    });

	  }
}

 

 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"
  android:background="@drawable/white"
  >
  <TextView  
  android:id="@+id/myTextView"
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content" 
  android:text="@string/title"
  android:textColor="@drawable/black"
  >
  </TextView>
  <Spinner 
  android:id="@+id/mySpinner"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" 
  >
  </Spinner>
</LinearLayout>

   myspinner_dropdown.xml

  <?xml version="1.0" encoding="utf-8"?>

<TextView  
 xmlns:android="http://schemas.android.com/apk/res/android"  
 android:id="@+id/text1"  
 android:layout_width="wrap_content"  
 android:layout_height="24sp"  
 android:singleLine="true" 
 style="?android:attr/spinnerDropDownItemStyle" />  

   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"
  >
  </translate>
  <alpha 
  android:fromAlpha="1.0" 
  android:toAlpha="0.0" 
  android:duration="300">
  </alpha>
</set>