Android RadioGroup supports single-choice and default Selection

This article uses radiogroup and radiobutton to implement Single-Choice of intra-group information,

Radiogroup groups radiobutton for the same management and control.

At the same time, the default value is also obtained.

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2. strings. xml

 
     
  
   
RadioGroupDemo
      
  
   
Select your gender:
      
  
   
Settings
      
  
   
Male
      
  
   
Female
  
 

3. MainActivity. java

protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                defaultStr = this.getResources().getString(R.string.please_selected);        seletedTv = (TextView) this.findViewById(R.id.diplay_seleted_item_tv);        sexRg = (RadioGroup) this.findViewById(R.id.sex_rg);        manRb = (RadioButton) this.findViewById(R.id.man_rb);        womanRb = (RadioButton) this.findViewById(R.id.woman_rb);                manRb.setChecked(true);        seletedTv.setText(defaultStr + manRb.getText().toString());                sexRg.setOnCheckedChangeListener(new OnCheckedChangeListener(){@Overridepublic void onCheckedChanged(RadioGroup rg, int checkedId) {// TODO Auto-generated method stubif(checkedId == manRb.getId()){seletedTv.setText(defaultStr + manRb.getText().toString());}else if(checkedId == womanRb.getId()){seletedTv.setText(defaultStr + womanRb.getText().toString());}else{seletedTv.setText(defaultStr);}}        });    }