动态添加删除Spinner代码,Java代码库,德仔网

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【Java】动态添加删除Spinner
作者:千如 / 发布于2015/5/25/ 689

	SpinnerActivity

	package cn.dccssq;

	import java.util.ArrayList;
	import java.util.List;

	import android.app.Activity;
	import android.os.Bundle;
	import android.view.Menu;
	import android.view.MenuItem;
	import android.view.View;
	import android.view.View.OnClickListener;
	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 SpinnerActivity extends Activity implements
	 Button.OnClickListener, Spinner.OnItemSelectedListener {

	private TextView show_yourChoice_TextView;
	private EditText input_City_EditText;
	private Button Add_Button, Del_Button;
	private Spinner city_Spinner;
	private ArrayAdapter<String> arrayAdapter;
	private String[] cities;
	private String addString;
	private List<String> cityList;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.main);
	 show_yourChoice_TextView = (TextView) findViewById(R.id.TextView_Show_yourChoice);
	 input_City_EditText = (EditText) findViewById(R.id.EditView_Input);
	 Add_Button = (Button) findViewById(R.id.Button_ADD);
	 Del_Button = (Button) findViewById(R.id.Button_DEL);
	 city_Spinner = (android.widget.Spinner) findViewById(R.id.cityItems);

	 cities = new String[] { "Android", "BlackBerry", "J2ME", "Symbian",
	 "Broncho", "LinuxMobile", "Palm", "WindwosMobile" };

	 cityList = new ArrayList<String>();

	 for (int i = 0; i < cities.length; i++) {
	 cityList.add(cities[i]);
	 }
	 arrayAdapter = new ArrayAdapter<String>(this,
	 android.R.layout.simple_spinner_item, cityList);
	 arrayAdapter
	 .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
	 city_Spinner.setAdapter(arrayAdapter);
	 show_yourChoice_TextView.setText(arrayAdapter.getItem(0));
	 city_Spinner.setSelection(0);
	 Add_Button.setOnClickListener((OnClickListener) this);
	 Del_Button.setOnClickListener((OnClickListener) this);
	 city_Spinner.setOnItemSelectedListener((OnItemSelectedListener) this);
	}

	public void onClick(View arg0) {
	 // TODO Auto-generated method stub
	 switch (arg0.getId()) {
	 case R.id.Button_ADD:
	 Toast.makeText(this, "ADD", Toast.LENGTH_SHORT).show();
	 addString = input_City_EditText.getText().toString();
	 for (int i = 0; i < arrayAdapter.getCount(); i++) {
	 if (addString.equals(arrayAdapter.getItemId(i))) {
	 return;
	 }
	 }
	 if (!addString.equals("")) {
	 arrayAdapter.add(addString);
	 int post = arrayAdapter.getPosition(addString);
	 city_Spinner.setSelection(post);
	 input_City_EditText.setText("");
	 }
	 break;
	 case R.id.Button_DEL:
	 if (city_Spinner.getSelectedItem() != null) {
	 arrayAdapter.remove(city_Spinner.getSelectedItem().toString());
	 input_City_EditText.setText("");
	 if (arrayAdapter.getCount() == 0) {
	 Toast.makeText(this, "DELETE", Toast.LENGTH_SHORT).show();
	 show_yourChoice_TextView.setText("");
	 }
	 }
	 break;
	 default:
	 break;
	 }
	}

	public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
	 long arg3) {
	 // TODO Auto-generated method stub
	 show_yourChoice_TextView.setText(arrayAdapter.getItem(arg2));
	}

	public void onNothingSelected(AdapterView<?> arg0) {
	 // TODO Auto-generated method stub

	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
	 // TODO Auto-generated method stub
	 menu.add("Exit");
	 return super.onCreateOptionsMenu(menu);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
	 // TODO Auto-generated method stub
	 finish();
	 return super.onOptionsItemSelected(item);
	}

	}

	

	

	main.xml

	

	<LinearLayout android:id="@+id/widget92"
	android:layout_width="fill_parent" android:layout_height="fill_parent"
	android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android">
	<TextView android:id="@+id/TextView_Show_yourChoice"
	 android:layout_width="190px" android:layout_height="wrap_content"
	 android:text="TextView" android:textSize="25sp"
	 android:layout_gravity="center_horizontal" />
	<EditText android:id="@+id/EditView_Input"
	 android:layout_width="fill_parent" android:layout_height="wrap_content"
	 android:textSize="18sp">
	</EditText>
	<Button android:id="@+id/Button_ADD" android:layout_width="fill_parent"
	 android:layout_height="wrap_content" android:text="ADD">
	</Button>
	<Button android:id="@+id/Button_DEL" android:layout_width="fill_parent"
	 android:layout_height="wrap_content" android:text="DELETE">
	</Button>
	<Spinner android:layout_width="fill_parent"
	 android:layout_height="wrap_content" android:id="@+id/cityItems">
	</Spinner>
	</LinearLayout>
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