【发布时间】：2020-09-07 16:27:03
【问题描述】：
大家好，我正在创建一个测验应用程序，在该应用程序中我正在为多项选择题创建一个动态 UI 它工作得很好但是当我在问题上选择单选按钮然后去下一个问题并选择单选按钮时我给了我错误 "java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.RadioButton " 此外，当我更改所选选项示例：首先我选择问题的选项 1，然后将其更改为选项 2，它给了我同样的错误 这是我的代码示例
for(int i=1;i<=5;i++){
TextView tv=new TextView(this);
tv.setId(i);
RadioGroup radioGroup=new RadioGroup(this);
for(int j=0;j<=3;j++){
RadioButton b1=new RadioButton(this);
b1.setText("option"+j);
b1.setId(j);
radioGroup.addView(b1);
}
tv.setText("Youre question No "+i);
tv.setTypeface(null, Typeface.BOLD);
tv.setTextColor(Color.BLACK);
radioGroup.setOrientation(RadioGroup.VERTICAL);
tv.setPadding(20,0,0,0);
radioGroup.setPadding(0,5,0,0);
linearLayout.addView(tv);
linearLayout.addView(radioGroup);
radioGroup.setOnCheckedChangeListener(this);
}
}
@Override
public void onCheckedChanged(RadioGroup radioGroup, int i) {
if (radioGroup.getCheckedRadioButtonId() != -1) {
RadioButton uans = findViewById(radioGroup.getCheckedRadioButtonId());//Error occurred here
String ansText = uans.getText().toString();
answersStringArray.add(ansText);
}
}
这里是例外：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.quizapp, PID: 3428
java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.RadioButton
at com.example.quizapp.Paper.onCheckedChanged(Paper.java:99)//This shows where is the error
at android.widget.RadioGroup.setCheckedId(RadioGroup.java:196)
at android.widget.RadioGroup.access$600(RadioGroup.java:59)
at android.widget.RadioGroup$CheckedStateTracker.onCheckedChanged(RadioGroup.java:381)
at android.widget.CompoundButton.setChecked(CompoundButton.java:183)
at android.widget.CompoundButton.toggle(CompoundButton.java:135)
at android.widget.RadioButton.toggle(RadioButton.java:76)
at android.widget.CompoundButton.performClick(CompoundButton.java:140)
at android.view.View.performClickInternal(View.java:7218)
at android.view.View.access$3800(View.java:824)
at android.view.View$PerformClick.run(View.java:27719)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:228)
at android.app.ActivityThread.main(ActivityThread.java:7782)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:981)
我该如何克服这个问题，请帮助我提前谢谢
【问题讨论】：
标签： android android-studio radio-button