android Spinner(下拉菜单）

最新推荐文章于 2024-07-12 22:33:35 发布

原创最新推荐文章于 2024-07-12 22:33:35 发布 · 388 阅读

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#android #layout #dropdown #encoding #import #string

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本文介绍了一个简单的Spinner控件使用案例，展示了如何在Android应用中设置Spinner并为其配置适配器，同时实现下拉框选择事件监听，更新UI显示。

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Spinner01.java:

package com.Spinner01;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class Spinner01 extends Activity {
private static final String[] mCountries={"o","a","b","ab","other"};
private Spinner mSpinner;
private TextView mTextView;
private ArrayAdapter<String> adapter;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mSpinner=(Spinner)findViewById(R.id.mSpinner);
        mTextView=(TextView)findViewById(R.id.mTextView);

        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,
          mCountries);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mSpinner.setAdapter(adapter);

        mSpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){

        @Override
        public void onItemSelected(AdapterView<?>arg0,View arg1,int arg2,long arg3)
        {
          mTextView.setText(""+mCountries[arg2]);
          arg0.setVisibility(View.VISIBLE);
        }

        @Override
        public void onNothingSelected(AdapterView<?>arg0)
        {

        }
        });
    }
}

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"
    >
<TextView
android:id="@+id/mTextView"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
<Spinner
android:id="@+id/mSpinner"
android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    />
</LinearLayout>