Android入门之RadioGroup（纯java）
16lz
2021-01-26
import android.app.Activity;import android.os.Bundle;import android.widget.*;import android.widget.RadioGroup.OnCheckedChangeListener;public class RadioGroupTest extends Activity { /** Called when the activity is first created. */ private LinearLayout mainLayout=null;private TextView tv=null;private RadioGroup rg=null; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mainLayout_init(); setContentView(mainLayout); } void mainLayout_init(){ mainLayout=new LinearLayout(this); LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-1); mainLayout.setLayoutParams(lp); mainLayout.setOrientation(LinearLayout.VERTICAL); rg_init(); mainLayout.addView(rg); mainLayout.addView(tv); } void rg_init(){ rg=new RadioGroup(this); RadioButton rb1=new RadioButton(this); rb1.setText("选择1"); rb1.setId(1); rg.addView(rb1); RadioButton rb2=new RadioButton(this); rb2.setText("选择2"); rb2.setId(2); rg.addView(rb2); RadioButton rb3=new RadioButton(this); rb3.setText("选择3"); rb3.setId(3); rg.addView(rb3); tv_init(); OnCheckedChangeListener listener=new OnCheckedChangeListener(){public void onCheckedChanged(RadioGroup group, int checkedId) {tv.setText("选项"+checkedId+"被选中了\n");} }; rg.setOnCheckedChangeListener(listener); } void tv_init(){ tv=new TextView(this); tv.setText("开始"); } }
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