android自定义Spinner下拉菜单(下拉列表框)样式

在Android中Spinner就是下拉菜单，它相当于HTML中的标签。Android中提供的Spinner Widget下拉菜单已经非常好用了，样式也适用，不过我们还是可以通过定义xml的方式来改变下拉菜单的样式。在layout目录下新建一个xml文件，名字随便(我这里叫myspinner.xml)。在这个文件里面可以定义下拉菜单的样式我们这里采用TextView来实现

在Activity中我们可以这样调用private static final String[] countriesStr={"","","",""}mySpinner = (Spinner) findViewById(R.id.mySpinner);ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, countriesStr);adapter.setDropDownViewResource(R.layout.myspinner_dropdown);mySpinner.setAdapter(adapter);

利用自定义的xml我们就可以很灵活的来改变下拉菜单的样式。

另外andorid也提供了两种基本的样式android.R.layout.simple_spinner_item:TextView的下拉菜单android.R.layout.simple_spinner_dropdown_item:右边带有radio的下拉菜单

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方法2：

自定义下拉菜单 -------- Spinnerimport java.util.ArrayList;import java.util.List;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.Button;import android.widget.EditText;import android.widget.Spinner;import android.widget.TextView;import android.widget.Toast;public class SpinnerDrop extends Activity {/** Called when the activity is first created. */private List cityList;private Spinner sp;private int pos;//private Animation animation;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);cityList= new ArrayList();//初始化一个city的String arraylistcountryList.add("长沙");countryList.add("北京");countryList.add("邵阳");pos=0;//标记选择的位置sp = (Spinner)findViewById(R.id.Spinner01);ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item,cityList);sp.setAdapter(adapter);//通过setAdapter()来读取ArrayAdapter里的数据sp.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){//下拉列表的选择事件public void onItemSelected(AdapterView parent, View view,int position, long id) {pos = position;//标记选择的位置TextView tv = (TextView)findViewById(R.id.xs);tv.setText("selected:"+cityList.get(position).toString());//显示选择的内容parent.setVisibility(View.VISIBLE);设置下拉列表的显示状态}public void onNothingSelected(AdapterView parent) {// TODO Auto-generated method stub

}

});

Button add = (Button)findViewById(R.id.add);//添加一个下拉项add.setOnClickListener(new Button.OnClickListener(){public void onClick(View v) {// TODO Auto-generated method stubEditText et = (EditText)findViewById(R.id.EditText01);String newstr = et.getText().toString();cityList.add(newstr);ArrayAdapter adapter = new ArrayAdapter(SpinnerDrop.this,android.R.layout.simple_spinner_item,cityList);sp.setAdapter(adapter);//添加数据后重新设置ArrayAdapter并加载进去et.setText("");Toast.makeText(SpinnerDrop.this, "添加成功", Toast.LENGTH_LONG).show();//浮框提示添加成功}

});Button del = (Button)findViewById(R.id.del);//删除下拉项del.setOnClickListener(new Button.OnClickListener(){public void onClick(View v) {cityList.remove(pos);ArrayAdapter adapter = new ArrayAdapter(SpinnerDrop.this,android.R.layout.simple_spinner_item,cityList);sp.setAdapter(adapter);Toast.makeText(SpinnerDrop.this, "删除成功", Toast.LENGTH_LONG).show();}

});

}}