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
xmlns:android="/apk/res/android " android:id="@+id/text1" android:layout_width="wrap_content" android:layout_height="24sp" android:singleLine="true" style="?android:attr/spinnerDropDownItemStyle" /> 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 ============ 方法2： 自定义下拉菜单 -------- Spinner import 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; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); cityList= new ArrayList();//初始化一个city的String arraylist countryList.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 stub EditText 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(); } }); } }
