android:Spinner下拉框

最新推荐文章于 2025-08-16 10:23:48 发布

原创最新推荐文章于 2025-08-16 10:23:48 发布 · 724 阅读

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本文介绍了如何在Android应用中使用Spinner控件和ArrayAdapter类来实现数据加载到下拉框列表的功能，并通过代码示例详细展示了创建适配器和设置数据的过程。

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下面是两种方式将数据加载到下拉框列表中：

这里写图片描述

MainActivity .java

public class MainActivity extends Activity {

    Spinner  spinner1;
    Spinner  spinner2;
    EditText edittext;
    private ArrayAdapter<String> mAdapter;
    private String[] mCounties={"北京","上海","深圳","广州"};

    private List<String> Counties=new ArrayList<String>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        spinner1=(Spinner)findViewById(R.id.spinner1);
        spinner2=(Spinner)findViewById(R.id.spinner2);
        edittext=(EditText) findViewById(R.id.edittext);
        for(int i=0;i<mCounties.length;i++){
            Counties.add(mCounties[i]);
        }
        mAdapter=new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_item,Counties);
        mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner1.setAdapter(mAdapter);


        ArrayAdapter<CharSequence> adapter=ArrayAdapter.createFromResource(MainActivity.this,R.array.counties,android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner2.setAdapter(adapter);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    public void Goto(View v){
            setTitle("从"+spinner1.getSelectedItem()+" 到  "+spinner2.getSelectedItem()+"去");
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/text1"
        />
    <Spinner 
        android:id="@+id/spinner1"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:drawSelectorOnTop="false"
        />
      <EditText 
        android:id="@+id/edittext"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:visibility="gone"
        android:hint="@string/text1"
         />
    <TextView 
       android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/text2"
        />
     <Spinner 
        android:id="@+id/spinner2"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:drawSelectorOnTop="false"
        />

     <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/text5"
        android:onClick="Goto"
         />
</LinearLayout>

array.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="counties">
        <item>北京</item>
        <item>上海</item>
        <item>深圳</item>
        <item>广州</item>
    </string-array>
</resources>