Question 125884 in Android Studio Question posted in
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Android Studio – getCheckedRadioButtonId() returns -1 even after the radio button is checked

I’m trying to get text from selected radiobutton. this code was working fine yesterday but now it’s returning null and I don’t understand why or what’s suddenly causing it.

Renaming variable, rewriting the code, re define variable, re initializing it does nothing to solve this.

the XML

      <RadioGroup
        android:id="@+id/radioGroupMurid"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="5dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/txtKelaminMurid"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Jenis Kelamin"
                android:textSize="20sp" />

            <RadioButton
                android:id="@+id/radioMuridLaki"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Laki-Laki" />

            <RadioButton
                android:id="@+id/radioMuridPerempuan"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Perempuan" />
        </LinearLayout>
    </RadioGroup>

Activity

private RadioGroup radioGroup;

protected void onCreate(Bundle savedInstaceState){
    super.onCreate(savedInstaceState);

setContentView(R.layout.murid_detail_activity);

radioGroup = (RadioGroup) findViewById(R.id.radioGroupMurid);

getRadioChecked();

}

public void getRadioChecked(){
    int sexMurid = radioGroup.getCheckedRadioButtonId();
    RadioButton rbSelected = (RadioButton) findViewById(sexMurid);
    jenisKelamin = rbSelected.getText().toString();
}

This is really fine yesterday, I just don’t know what’s causing it? can anyone help?

Tags:

3

Answers


  1. 0

    The return type of radioGroup.getCheckedRadioButtonId() (as in the docs) is an int. An int cannot be null, so I think you should rely on -1.

    Edit: If you’re not sure how an Android component works, just check the source code 🙂 For the RadioGroup, see for example: http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/5.1.1_r1/android/widget/RadioGroup.java#RadioGroup.clearCheck%28%29

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  2. 0 
        RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroupMurid);
    RadioButton rbSelected = (RadioButton) findViewById(sexMurid);
    RadioButton radioMuridPerempuan = (RadioButton) findViewById(radioMuridPerempuan);

    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            if (checkedId == R.id.sexMurid) {
                jenisKelamin = rbSelected.getText().toString();
            else if (checkedId == R.id.radioMuridPerempuan) {
                jenisKelamin = radioMuridPerempuan.getText().toString();
            }

        }
    });
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  3. 0

    This occurs when RadioButton is not a direct child of RadioGroup. In your code the direct child of RadioGroup is LinearLayout. Try with the RadioGroup tag inside of LinearLayout like this:

      <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="5dp"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/txtKelaminMurid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Jenis Kelamin"
        android:textSize="20sp" />

    <RadioGroup
        android:id="@+id/radioGroupMurid"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        
        <RadioButton
            android:id="@+id/radioMuridLaki"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Laki-Laki" />

        <RadioButton
            android:id="@+id/radioMuridPerempuan"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Perempuan" />
        
    </RadioGroup>
    
</LinearLayout>
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