动态添加/删除Spinner 菜单
2011-12-05 11:04
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package com.turboradio.googlesdk; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.Spinner; import android.widget.TextView; public class Ex04_09_Spinner extends Activity { private static final String [] countriesStr = { "北京市","上海市","天津市","重庆市" }; private TextView myTextView; private EditText myEditText; private Spinner mySpinner; private ArrayAdapter<String> adapter; private List<String> allCountries; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ex_04_09); allCountries = new ArrayList<String>(); for(int i = 0;i<countriesStr.length;i++){ allCountries.add(countriesStr[i]); } adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,allCountries); /**设置Item的样式**/ adapter.setDropDownViewResource(android.R.layout.simple_spinner_item); myTextView = (TextView)findViewById(R.id.text1); myEditText = (EditText)findViewById(R.id.edit); mySpinner = (Spinner)findViewById(R.id.spinner); mySpinner.setAdapter(adapter); mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){ public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { myTextView.setText(parent.getSelectedItem().toString()); } public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub }}); } /** * 添加按钮事件 */ public void addSpinnerItem(View v){ String newCountry = myEditText.getText().toString(); /**先判断值是否存在,不存在再添加**/ for(int i = 0;i<adapter.getCount();i++){ if(newCountry.equals(adapter.getItem(i))){ return; } } if(!newCountry.equals("")){ adapter.add(newCountry); int position = adapter.getPosition(newCountry); mySpinner.setSelection(position); myEditText.setText(""); } } /** * 删除按钮事件 */ public void removeSpinnerItem(View v){ if(mySpinner.getSelectedItem() != null){ /**删除mySpinner的值**/ adapter.remove(mySpinner.getSelectedItem().toString()); myEditText.setText(""); if(adapter.getCount() == 0){ myTextView.setText(""); } } } }
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/text1" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <EditText android:id="@+id/edit" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Button android:id="@+id/add" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="添加" android:onClick="addSpinnerItem" /> <Button android:id="@+id/delete" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="删除" android:onClick="removeSpinnerItem" /> <Spinner android:id="@+id/spinner" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout>
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