Android开发之组件单选框（RadioButton）多选框（CheckBox）下拉框（Spinner）

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1.单选框（RadioButton）

package com.example.radiobutton;


import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
/*
 * 要完成单选框显示，我们需要使用到RadioGroup和RadioButton(单选框)，RadioGroup用于对单选框进行分组，相同组内的单选框只有一个单选框能被选中。(例子代码请见下方备注栏)
 RadioGroup.check(R.id.dotNet);将id名为dotNet的单选框设置成选中状态。
(RadioButton) findViewById(radioGroup.getCheckedRadioButtonId());//获取被选中的单选框。
RadioButton.getText();//获取单选框的值
调用setOnCheckedChangeListener()方法，处理单选框被选择事件，把RadioGroup.OnCheckedChangeListener实例作为参数传入
 */
public class MainActivity extends Activity {
private RadioGroup group_temo;
   private RadioButton checkRadioButton;
   
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
group_temo = (RadioGroup) findViewById(R.id.radioGroup1);
//改变默认的选项
group_temo.check(R.id.radio1);
//获取默认被被选中值
checkRadioButton = (RadioButton) group_temo.findViewById(group_temo.getCheckedRadioButtonId());
//
//注册事件
group_temo.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {

//点击事件获取的选择对象
checkRadioButton = (RadioButton) group_temo.findViewById(checkedId);

Toast.makeText(getApplicationContext(), "您选择的专业是"+checkRadioButton.getText(), Toast.LENGTH_LONG).show();
}
});
}




}

2.多选框；

package com.example.checkbutton;


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


import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.view.Menu;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;
 /**
  * 每个多选框都是独立的，可以通过迭代所有多选框，然后根据其状态是否被选中再获取其值。
 CheckBox.setChecked(true);//设置成选中状态。
 CheckBox.getText();//获取多选框的值
 调用setOnCheckedChangeListener()方法，处理多选框被选择事件，把CompoundButton.OnCheckedChangeListener实例作为参数传入


  * @author John
  *
  */
public class MainActivity extends Activity {
// 声明多选列表对象
private CheckBox cbx1, cbx2, cbx3, cbx4;
private List<CheckBox> checkBoxs= new ArrayList<CheckBox>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cbx1 = (CheckBox) findViewById(R.id.checkBox1);
cbx2 = (CheckBox) findViewById(R.id.checkBox2);
cbx3 = (CheckBox) findViewById(R.id.checkBox3);
cbx4 = (CheckBox) findViewById(R.id.checkBox4);

// 默认选项
cbx1.setChecked(true);
cbx3.setChecked(true);
// 注册事件
/*
* cbx1.setOnCheckedChangeListener(new MyOnCheckedChangeListener());
* cbx2.setOnCheckedChangeListener(new MyOnCheckedChangeListener());
* cbx3.setOnCheckedChangeListener(new MyOnCheckedChangeListener());
* cbx4.setOnCheckedChangeListener(new MyOnCheckedChangeListener());
*/
cbx1.setOnCheckedChangeListener(listener);
cbx2.setOnCheckedChangeListener(listener);
cbx3.setOnCheckedChangeListener(listener);
cbx4.setOnCheckedChangeListener(listener);


// 添加到集合中
checkBoxs.add(cbx1);
checkBoxs.add(cbx2);
checkBoxs.add(cbx3);
checkBoxs.add(cbx4);
}
  public void getValues(View v){
   String content = "";
   for(CheckBox cbx:checkBoxs){
    if(cbx.isChecked()){
    content+=cbx.getText()+"\n";
     
    }
   }
   if ("".equals(content)) {
content = "您还没有选择任何专业";
}
   new AlertDialog.Builder(this).setMessage(content).setTitle("您选择的专业有")
.setPositiveButton("关闭", null).show();
  } 
CompoundButton.OnCheckedChangeListener listener  = new CompoundButton.OnCheckedChangeListener() {

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
      CheckBox box = (CheckBox) buttonView;
      
      Toast.makeText(getApplicationContext(), "选择的专业是"+isChecked+box.getText(), Toast.LENGTH_LONG).show();

}
};

3.下拉框：

  package com.example.spinner;


import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.SimpleAdapter;
import android.widget.Spinner;
import android.widget.Toast;


public class MainActivity extends Activity {
   //声明spinner对象
private Spinner spinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//根据ID获取对象
spinner = (Spinner) findViewById(R.id.spinner1);
 //显示的数据
final  String[] arr={
  "爱你一万年",
  "天使的翅膀",
  "画地为老",
  "下一个天亮",
  "到不了",
  "天下",
  "开心马骝",
};
//adapter对象
//ArrayAdapter<String > arrayAdapter  = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, arr);
   List<Map<String,Object>> data = new ArrayList<Map<String,Object>>();
   Map<String,Object> map = new HashMap<String, Object>();
   
   map.put("logo", R.drawable.mw);
   map.put("text","最后一次的温柔");
   Map<String,Object> map1 = new HashMap<String, Object>();
   map1.put("logo", R.drawable.mw);
   map1.put("text","Afterschool");
   data.add(map);
   data.add(map1);
   SimpleAdapter simpleAdapter = 
new SimpleAdapter(this, data, R.layout.activity_item, new String[]
{"logo","text"}, new int[]{R.id.imageView1,R.id.textView1});
 //设置显示的数据
  //spinner.setAdapter(arrayAdapter);
   spinner.setAdapter(simpleAdapter);
   Toast.makeText(getApplicationContext(), 
    "我相信"+spinner.getItemIdAtPosition(spinner.getSelectedItemPosition()), Toast.LENGTH_LONG).show();

   //注册事件
   
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {


@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
 Spinner spinner  = (Spinner) parent;
 Toast.makeText(getApplicationContext(), "冰心诀"+spinner.getItemAtPosition(position), Toast.LENGTH_LONG).show();
}


@Override
public void onNothingSelected(AdapterView<?> arg0) {
  
Toast.makeText(getApplicationContext(), "没有改变的处理", Toast.LENGTH_LONG).show();
}
});

}