spinner下拉列表

list.xml：<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity">  <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/tv" />  </RelativeLayout>

activity_main.xml：<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity">  <Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/spinner" />  <Button android:layout_below="@+id/spinner" android:id="@+id/bt1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/add" android:onClick="doClick" />  <Button android:id="@+id/bt2" android:layout_below="@+id/spinner" android:layout_toRightOf="@+id/bt1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/delete" android:onClick="doClick" />  </RelativeLayout>

代码实现：

package com.spinner;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.view.Menu;import android.view.View;import android.view.ViewGroup.LayoutParams;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;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 MainActivity extends Activity {Spinner sp;Button bt1,bt2;List<String> al;EditText et;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);setView();sp.setPrompt("你喜欢的动漫是：");al=new ArrayList<String>();al.add("海贼王");al.add("火影忍者");al.add("游戏王");ArrayAdapter<String> aa=new ArrayAdapter<String>(this, R.layout.list,R.id.tv, al);sp.setAdapter(aa);sp.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> adapter, View v,int position, long id) {Toast.makeText(MainActivity.this, adapter.getItemAtPosition(position).toString(), 3000).show();}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {}});}private void setView() {sp=(Spinner) findViewById(R.id.spinner);bt1=(Button) findViewById(R.id.bt1);bt2=(Button) findViewById(R.id.bt2);}public void doClick(View v){et=new EditText(this);et.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT));switch(v.getId()){case R.id.bt1:new AlertDialog.Builder(this).setIcon(android.R.drawable.btn_star).setTitle("你要添加的内容：").setView(et).setPositiveButton("确定", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {for(int i=0;i<al.size();i++){if(al.get(i).equalsIgnoreCase(et.getText().toString())){break;}}al.add(et.getText().toString());}}).setNegativeButton("取消", null).create().show();break;case R.id.bt2:new AlertDialog.Builder(this).setIcon(android.R.drawable.btn_star).setTitle("你要删除的内容：").setView(et).setPositiveButton("确定", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {al.remove(et.getText().toString());}}).setNegativeButton("取消", null).create().show();break;}}}