I encounter a crash "java.lang.NullPointerException" whenever I run my
app. please help:
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package Botton.radio;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class RadioButtonWidget extends Activity {
public class ClearButtonListener implements OnClickListener {
@Override
public void onClick(View aArg0) {
mRadioGroup.clearCheck();
mTextView.setText(getString(R.string.selection) + " "
+ getString(R.string.none));
}
}
public class RadioGroupListener implements OnCheckedChangeListener
{
@Override
public void onCheckedChanged(RadioGroup radioButton,
int idOfSelectedRadioButton) {
if (idOfSelectedRadioButton != -1) {
mRadioButton = (RadioButton)
findViewById(idOfSelectedRadioButton);
mTextView.setText(getString(R.string.selection) + " "
+ mRadioButton.getText());
}
}
}
private Button mClearButton;
private RadioButton mRadioButton;
private RadioGroup mRadioGroup;
private TextView mTextView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addWidgetListeners();
setWidgetReferences();
}
private void addWidgetListeners() {
ClearButtonListener aListener = new ClearButtonListener();
RadioGroupListener rListener = new RadioGroupListener();
mClearButton.setOnClickListener(aListener);
mRadioGroup.setOnCheckedChangeListener(rListener);
}
private void setWidgetReferences() {
mClearButton = (Button) findViewById(R.id.clear);
mRadioGroup = (RadioGroup) findViewById(R.id.menu);
mTextView = (TextView) findViewById(R.id.choice);
}
}
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