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

最新推荐文章于 2021-05-28 23:02:41 发布

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最新推荐文章于 2021-05-28 23:02:41 发布

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分类专栏：计算机软件

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本文详细介绍了如何在Android中使用Spinner组件，并通过setDropDownViewResource方法自定义下拉菜单的显示样式，以实现更个性化的用户界面。

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package irdc.ex04_08; 
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.TextView; 
//import android.widget.ListView; 
import android.widget.Spinner; 
public class EX04_08 extends Activity 
{ 
  private static final String[] countriesStr = { "台北市", "台北县", "台中市", "高雄市" };
  private TextView myTextView;
  private Spinner mySpinner; 
  
  
  private ArrayAdapter adapter;     //定义下拉菜单的显示方式
  Animation myAnimation;            //定义下拉菜单的显示的动态效果
  
  
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) 
  { 
    super.onCreate(savedInstanceState);
    /* 载入main.xml Layout */
    setContentView(R.layout.main); 
    
    /* 以findViewById()取得对象 */
    myTextView = (TextView) findViewById(R.id.myTextView);
    mySpinner = (Spinner) findViewById(R.id.mySpinner); 
    
    
    //这里android.R.layout.simple_spinner_item是使用了Android提供的ResourceID，关联下拉菜单选项
    adapter = new ArrayAdapter(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加入Spinner对象中 */ 
    mySpinner.setAdapter(adapter);
    
    /* 将mySpinner加入OnItemSelectedListener */ 
    mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() 
    { 
      @Override 
      public void onItemSelected(AdapterView arg0, View arg1, int arg2, long arg3) 
      {
        /* 将所选mySpinner的值带入myTextView中 */
        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目录下 */
    myAnimation = AnimationUtils.loadAnimation(this, R.anim.my_anim); 
    /* 将mySpinner加入OnTouchListener */ 
    mySpinner.setOnTouchListener(new Spinner.OnTouchListener() 
    { 
      @Override 
      public boolean onTouch(View v, MotionEvent event) 
      { 
        /* 将mySpinner执行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 
        }
      });
    } 
  }

<?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>

<?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>