Android – How to uncheck RadioButton if already checked in RadioGroup

androidradio-buttonradio-group

I have two RadioButtons in RadioGroup, initially both are unchecked. I want to uncheck RadioButton if it is already checked. I have tried but I'm unable to do it. When I choose any radio button then it is not changing state to checked first time, if I select same radio button second time then it is changing its state, and if I select other radio button if one button is checked then it is also not changing the state first time and all button get unchecked can anyone help me? My code is given below…

radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
RadioButton checkedRadioButton = (RadioButton)group.findViewById(checkedId);
pus="";

boolean isChecked = checkedRadioButton.isChecked();
 if(isChecked){
     checkedRadioButton.setChecked(false);

 }else{
     checkedRadioButton.setChecked(true);

 }
}
 Toast.makeText(context, pus, Toast.LENGTH_SHORT).show();
}
});

<RadioGroup
    android:id="@+id/rdbt_group"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:padding="5dp"

    android:gravity="center"
    android:orientation="horizontal" >

    <RadioButton
    android:id="@+id/radio_no"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:background="@drawable/rbtn_selector"
    android:button="@null"
    android:gravity="center"
    android:paddingBottom="5dp"
    android:paddingLeft="10dp"
    android:paddingRight="10dp"
    android:paddingTop="5dp"
    android:clickable="true"
    android:textColor="@drawable/rbtn_textcolor_selector"
    android:textSize="15sp" />

    <RadioButton
    android:id="@+id/radio_yes"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:button="@null"
    android:clickable="true"
    android:textSize="15sp"
    android:background="@drawable/rbtn_selector"
    android:textColor="@drawable/rbtn_textcolor_selector"
    android:padding="5dp"
    android:gravity="center"
    />
</RadioGroup>

Best Answer

I know it's a bit late to answer this question but still, if it can help someone else I would be glad.

Just make a custom class extending RadioButton or AppCompatRadioButton and override toggle() method.

public class UncheckableRadioButton extends AppCompatRadioButton {

    public UncheckableRadioButton(Context context) {
        super(context);
    }

    public UncheckableRadioButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public UncheckableRadioButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public void toggle() {

        if (isChecked()) {
            if (getParent() != null && getParent() instanceof RadioGroup) {
                ((RadioGroup) getParent()).clearCheck();
            }
        } else {
            super.toggle();
        }
    }

    @Override
    public CharSequence getAccessibilityClassName() {
        return UncheckableRadioButton.class.getName();
    }
}

And this will also work if you check radioGroup.getCheckedRadioButtonId().

Related Solutions

Android – How to save an activity state using the save instance state

You need to override onSaveInstanceState(Bundle savedInstanceState) and write the application state values you want to change to the Bundle parameter like this:

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
  super.onSaveInstanceState(savedInstanceState);
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.
  savedInstanceState.putBoolean("MyBoolean", true);
  savedInstanceState.putDouble("myDouble", 1.9);
  savedInstanceState.putInt("MyInt", 1);
  savedInstanceState.putString("MyString", "Welcome back to Android");
  // etc.
}

The Bundle is essentially a way of storing a NVP ("Name-Value Pair") map, and it will get passed in to onCreate() and also onRestoreInstanceState() where you would then extract the values from activity like this:

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // Restore UI state from the savedInstanceState.
  // This bundle has also been passed to onCreate.
  boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
  double myDouble = savedInstanceState.getDouble("myDouble");
  int myInt = savedInstanceState.getInt("MyInt");
  String myString = savedInstanceState.getString("MyString");
}

Or from a fragment.

@Override
public void onViewStateRestored(@Nullable Bundle savedInstanceState) {
    super.onViewStateRestored(savedInstanceState);
    // Restore UI state from the savedInstanceState.
    // This bundle has also been passed to onCreate.
    boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
    double myDouble = savedInstanceState.getDouble("myDouble");
    int myInt = savedInstanceState.getInt("MyInt");
    String myString = savedInstanceState.getString("MyString");
}

You would usually use this technique to store instance values for your application (selections, unsaved text, etc.).

Android – How to center text horizontally and vertically in a TextView

I'm assuming you're using XML layout.

<TextView  
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:gravity="center"
    android:text="@string/**yourtextstring**"
/>

You can also use gravity center_vertical or center_horizontal according to your need.

and as @stealthcopter commented in java: .setGravity(Gravity.CENTER);

Best Answer

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Android – How to save an activity state using the save instance state

Android – How to center text horizontally and vertically in a TextView

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