Can't set OnCheckedChangeListener to a Checkbox

Question

I am trying to set a OnCheckedChangeListener to a CheckBox but my application exits in the run time. I also tried to set listeners for my Tex

Answer 1

public class MainActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {
List mList = new ArrayList<>();
CheckBox android, java, python, php, unity3D;
Button submitButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    android = (CheckBox) findViewById(R.id.androidCheckBox);
    android.setOnCheckedChangeListener(this);
    java = (CheckBox) findViewById(R.id.javaCheckBox);
    java.setOnCheckedChangeListener(this);
    python = (CheckBox) findViewById(R.id.pythonCheckBox);
    python.setOnCheckedChangeListener(this);
    php = (CheckBox) findViewById(R.id.phpCheckBox);
    php.setOnCheckedChangeListener(this);
    unity3D = (CheckBox) findViewById(R.id.unityCheckBox);
    unity3D.setOnCheckedChangeListener(this);

    submitButton = (Button) findViewById(R.id.submitButton);
    submitButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Log.e("ArrayList Values*******",mList.toString());
        }
    });

}

@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
    switch (compoundButton.getId()) {
        case R.id.androidCheckBox:
            if (android.isChecked()) {
                mList.add(String.valueOf(android.getText()));
                Log.e("Android*******",mList.toString());
            }
            else {
                    mList.remove(android.getText());
            }
            break;

        case R.id.javaCheckBox:
            if (java.isChecked()) {
                mList.add(String.valueOf(java.getText()));
                Log.e("Java*******",mList.toString());
            }
            else {
                mList.remove(java.getText());
            }
            break;

        case R.id.phpCheckBox:
            if (php.isChecked()) {
                mList.add(String.valueOf(php.getText()));
                Log.e("PHP*******",mList.toString());
            }
            else {
                mList.remove(php.getText());
            }
            break;

        case R.id.pythonCheckBox:
            if (python.isChecked()){
                mList.add(String.valueOf(python.getText()));
                Log.e("Python*******",mList.toString());
            }
            else {
                mList.remove(python.getText());
            }
            break;

        case R.id.unityCheckBox:
            if (unity3D.isChecked()){
                mList.add(String.valueOf(unity3D.getText()));
                Log.e("Unity*******",mList.toString());
            }
            else {
                mList.remove(unity3D.getText());
            }
            break;
      }
  }
}