安卓纯java写Spinner

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[java]view
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import android.app.Activity;  

import android.os.Bundle;  

import android.view.View;  

import android.widget.*;  

import android.widget.AdapterView.OnItemSelectedListener;  

public class SpinnerTest extends Activity {  

    private LinearLayout mainLayout=null;  

    private TextView tv1=null;  

    private Spinner spinner1=null;  

    private TextView tv2=null;  

    private Spinner spinner2=null;  

    private TextView tv3=null;  

    public void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        mainLayout_init();  

        setContentView(mainLayout);  

    }  

    void mainLayout_init(){  

        mainLayout=new LinearLayout(this);  

        LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-1);  

        mainLayout.setLayoutParams(lp);  

        mainLayout.setOrientation(LinearLayout.VERTICAL);  

        tv1_init();  

        mainLayout.addView(tv1);  

        spinner1_init();  

        mainLayout.addView(spinner1);  

        tv2_init();  

        mainLayout.addView(tv2);  

        spinner2_init();  

        mainLayout.addView(spinner2);  

        tv3=new TextView(this);  

        tv3.setText("显示");  

        mainLayout.addView(tv3);  

    }  

    /*tv1初始化*/  

    void tv1_init(){  

        tv1=new TextView(this);  

        LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-2);  

        tv1.setLayoutParams(lp);  

        tv1.setText("Spinner测试");  

    }  

    /*spinner初始化*/  

    void spinner1_init(){  

        spinner1=new Spinner(this);  

        LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -2);  

        spinner1.setLayoutParams(lp);  

        spinner1.setPrompt("这是标题");  

        String s[]={"选项一","选项二","选项三"};  

        ArrayAdapter<String> aa=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,s);  

        //设置为下拉式Item格式  

        aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  

        spinner1.setAdapter(aa);  

        //添加监听  

        OnItemSelectedListener otsc=new OnItemSelectedListener(){  

            public void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {  

                tv3.setText("选项"+String.valueOf(arg2+1)+"被你选中了");  

            }  

            public void onNothingSelected(AdapterView<?> arg0) {  

            }  

        };  

        spinner1.setOnItemSelectedListener(otsc);  

    }  

    /**/  

    void tv2_init(){  

        tv2=new TextView(this);  

        LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-2);  

        tv2.setLayoutParams(lp);  

        tv2.setText("换一种风格");  

    }  

    /**/  

    void spinner2_init(){  

        //  

        spinner2=new Spinner(this);  

        LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -2);  

        spinner2.setLayoutParams(lp);  

        //spinner2.setPrompt("这是标题");  

        String s[]={"选项一","选项二","选项三"};  

        ArrayAdapter<String> aa=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,s);  

        //另一种风格  

        aa.setDropDownViewResource(android.R.layout.simple_spinner_item);  

        spinner2.setAdapter(aa);  

    }  

}