Spinner的简单使用

小鱼儿 2022-07-15 00:28 149阅读 0赞

package com.example.spinner;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemSelectedListener;
    import android.widget.ArrayAdapter;
    import android.widget.Spinner;
    import android.widget.TextView;
    
    public class MainActivity extends Activity {
    private TextView textView;
    private Spinner spinner;
    private List<String> list;
    private ArrayAdapter<String> adapter;
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    		textView=(TextView) findViewById(R.id.text);
    		spinner=(Spinner) findViewById(R.id.spinner1);
    		textView.setText("您选择的城市是北京");
    		//1、设置数据源
    		list=new ArrayList<String>();
    		list.add("北京");
    		list.add("上海");
    		list.add("广州");
    		list.add("深圳");
    		//2、创建ArrayAdapter<String>数组适配器
    		adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,list);
    		//3、adapter设置一个下拉列表样式
    		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    		//4、spinner加载适配器
    		spinner.setAdapter(adapter);
    		spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
    
    			@Override
    			public void onItemSelected(AdapterView<?> parent, View view,
    					int position, long id) {
    				// TODO Auto-generated method stub
    				String city=adapter.getItem(position);
    				textView.setText("您选择的城市是"+city);
    			}
    
    			@Override
    			public void onNothingSelected(AdapterView<?> parent) {
    				// TODO Auto-generated method stub
    				
    			}
    		});
    	}
    
    	@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;
    	}
    
    	@Override
    	public boolean onOptionsItemSelected(MenuItem item) {
    		// Handle action bar item clicks here. The action bar will
    		// automatically handle clicks on the Home/Up button, so long
    		// as you specify a parent activity in AndroidManifest.xml.
    		int id = item.getItemId();
    		if (id == R.id.action_settings) {
    			return true;
    		}
    		return super.onOptionsItemSelected(item);
    	}
    }