java – How to check if android checkbox is checked within its onClick method (declared in XML)?-ThrowExceptions

Exception or error:

I have a checkbox in android which has the following XML:

<CheckBox
   android:id="@+id/item_check"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:onClick="itemClicked" />

This is my onClick() method in my Activity class.

public void itemClicked(View v) {
  //code to check if this checkbox is checked!
}

I am aware that we can create an object of the checkbox and assign id to it. But is there a better way to achieve the functionality when declaring onClick method via XML?

How to solve:

try this one :

public void itemClicked(View v) {
  //code to check if this checkbox is checked!
  CheckBox checkBox = (CheckBox)v;
  if(checkBox.isChecked()){

  }
}

###

This will do the trick:

  public void itemClicked(View v) {
    if (((CheckBox) v).isChecked()) {
        Toast.makeText(MyAndroidAppActivity.this,
           "Checked", Toast.LENGTH_LONG).show();
    }
  }

###

<CheckBox
      android:id="@+id/checkBox1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Fees Paid Rs100:"
      android:textColor="#276ca4"
      android:checked="false"
      android:onClick="checkbox_clicked" />

Main Activity from here

   public class RegistA extends Activity {
CheckBox fee_checkbox;
 @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_regist);
 fee_checkbox = (CheckBox)findViewById(R.id.checkBox1);// Fee Payment Check box
}

checkbox clicked

     public void checkbox_clicked(View v)
     {

         if(fee_checkbox.isChecked())
         {
            // true,do the task 

         }
         else
         {

         }

     }

###

You can try this code:

public void itemClicked(View v) {
 //code to check if this checkbox is checked!
 if(((Checkbox)v).isChecked()){
   // code inside if
 }
}

###

@BindView(R.id.checkbox_id) // if you are using Butterknife
CheckBox yourCheckBox;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_activity); 
    yourCheckBox = (CheckBox)findViewById(R.id.checkbox_id);// If your are not using Butterknife (the traditional way)

    yourCheckBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            yourObject.setYourProperty(yourCheckBox.isChecked()); //yourCheckBox.isChecked() is the method to know if the checkBox is checked
            Log.d(TAG, "onClick: yourCheckBox = " + yourObject.getYourProperty() );
        }
    });
}

Obviously you have to make your XML with the id of your checkbox :

<CheckBox
    android:id="@+id/checkbox_id"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Your label"
    />

So, the method to know if the check box is checked is : (CheckBox) yourCheckBox.isChecked() it returns true if the check box is checked.

Leave a Reply

Your email address will not be published. Required fields are marked *