I am a newbie trying to create a simple quiz app in Android Studio. Things were progressing reasonably well until I tried to create an onClick event for a radiogroup.
I took a look at this previously answered question: java.lang.IllegalStateException: Could not execute method for android:onClick Android App but the solution did not shed any light on my issue.
Another thing I noticed was a problem with the imported AppCompatViewInflater.java WHICH 'cannot resolve symbol 'R''?
Any advice would much appreciated.
This is the logcat error message that I see:
02-05 09:19:16.989 29473-29473/com.example.hughdavidson_quizapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.hughdavidson_quizapp, PID: 29473
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:414)
at android.view.View.performClick(View.java:5205)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:992)
at android.view.View$PerformClick.run(View.java:21164)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:409)
at android.view.View.performClick(View.java:5205)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:992)
at android.view.View$PerformClick.run(View.java:21164)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x7f0c0004
This is the MainActivity.java code
///
public class MainActivity extends AppCompatActivity {
RadioGroup radioGroupQ1;
ImageView q1ImageView;
TextView textViewQ2;
ImageView q2ImageView;
CheckBox checkBoxQ3_i, checkBoxQ3_ii, checkBoxQ3_iii, checkBoxQ3_iv, checkBoxQ3_v;
ImageView q3_i_ImageView, q3_ii_ImageView, q3_iii_ImageView, q3_iv_ImageView, q3_v_ImageView;
boolean hasCheckBoxQ3_i = false;
boolean hasCheckBoxQ3_ii = false;
boolean hasCheckBoxQ3_iii = false;
boolean hasCheckBoxQ3_iv = false;
boolean hasCheckBoxQ3_v = false;
EditText editTextQ4_i_Answer, editTextQ4_ii_Answer, editTextQ4_iii_Answer, editTextQ4_iv_Answer;
ImageView q4_i_ImageView, q4_ii_ImageView, q4_iii_ImageView, q4_iv_ImageView;
int userScore = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Ref for working with radiogroups: https://stackoverflow.com/questions/9748070/radio-group-onclick-event-not-firing-how-do-i-tell-which-is-selected
radioGroupQ1 = (RadioGroup) findViewById(R.id.q1_radio_buttons);
radioGroupQ1.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch(checkedId){
case R.id.q1_radioButton_false:
userScore += + 0;
q1ImageView.setImageResource(R.mipmap.red_cross);
break;
case R.id.q1_radioButton_true:
userScore += + 1;
q1ImageView.setImageResource(R.mipmap.green_tick);
break;
}
}
});
textViewQ2 = (TextView) findViewById(R.id.q2_editText);
checkBoxQ3_i = (CheckBox) findViewById(R.id.checkBoxQ3_i) ;
checkBoxQ3_ii = (CheckBox) findViewById(R.id.checkBoxQ3_ii) ;
checkBoxQ3_iii = (CheckBox) findViewById(R.id.checkBoxQ3_iii) ;
checkBoxQ3_iv = (CheckBox) findViewById(R.id.checkBoxQ3_iv) ;
checkBoxQ3_v = (CheckBox) findViewById(R.id.checkBoxQ3_v) ;
editTextQ4_i_Answer = (EditText) findViewById(R.id.q4_i_editBox);
editTextQ4_ii_Answer = (EditText) findViewById(R.id.q4_ii_editBox);
editTextQ4_iii_Answer = (EditText) findViewById(R.id.q4_iii_editBox);
editTextQ4_iv_Answer = (EditText) findViewById(R.id.q4_iv_editBox);
q1ImageView = (ImageView) findViewById(R.id.q1_redcross_image_view);
q2ImageView = (ImageView) findViewById(R.id.q2_redgreencheck_image_view);
q3_i_ImageView = (ImageView) findViewById(R.id.q3_i_greencheck_image_view);
q3_ii_ImageView = (ImageView) findViewById(R.id.q3_ii_greencheck_image_view);
q3_iii_ImageView = (ImageView) findViewById(R.id.q3_iii_redcheck_image_view);
q3_iv_ImageView = (ImageView) findViewById(R.id.q3_iv_greencheck_image_view);
q3_v_ImageView = (ImageView) findViewById(R.id.q3_v_greencheck_image_view);
q4_i_ImageView = (ImageView) findViewById(R.id.q4_i_redgreencheck_image_view);
q4_ii_ImageView = (ImageView) findViewById(R.id.q4_ii_redgreencheck_image_view);
q4_iii_ImageView = (ImageView) findViewById(R.id.q4_iii_redgreencheck_image_view);
q4_iv_ImageView = (ImageView) findViewById(R.id.q4_iv_redgreencheck_image_view);
}
//Show users total score
public void showScore(View view){
//Check score for question 1
//Check score for question 2
String q2Answer = "1000000";
if (textViewQ2.getText().toString().equals(q2Answer)){
userScore = userScore + 1;
q2ImageView.setImageResource(R.mipmap.green_tick);
}
else q2ImageView.setImageResource(R.mipmap.red_cross);
//check score for question 3
//has Q3-i been ticked
hasCheckBoxQ3_i = checkBoxQ3_i.isChecked();
//has Q3-ii been ticked
hasCheckBoxQ3_ii = checkBoxQ3_ii.isChecked();
//has Q3-iii been ticked
hasCheckBoxQ3_iii = checkBoxQ3_iii.isChecked();
//has Q3-iv been ticked
hasCheckBoxQ3_iv = checkBoxQ3_iv.isChecked();
//has Q3-v been ticked
hasCheckBoxQ3_v = checkBoxQ3_i.isChecked();
if(hasCheckBoxQ3_i){
userScore += +1;
q3_i_ImageView.setImageResource(R.mipmap.green_tick);
}
if(hasCheckBoxQ3_ii){
userScore += +1;
q3_ii_ImageView.setImageResource(R.mipmap.green_tick);
}
if(hasCheckBoxQ3_iii){
userScore += +1;
q3_iii_ImageView.setImageResource(R.mipmap.green_tick);
}
if(hasCheckBoxQ3_iv){
userScore += +1;
q3_iv_ImageView.setImageResource(R.mipmap.green_tick);
}
if(hasCheckBoxQ3_v){
userScore += +0;
q3_v_ImageView.setImageResource(R.mipmap.red_cross);
}
//Check score for Q4
//Reference: string comparison https://stackoverflow.com/questions/16143562/string-comparison-android/16143606#:~:text=The%20%3D%3D%20operator%20checks%20to,to%20compare%20strings%20for%20equality.
String Q4_i = "E";
String Q4_ii = "A";
String Q4_iii = "C";
String Q4_iv = "B";
if(editTextQ4_i_Answer.getText().toString().equals(Q4_i)){
userScore += +1;
q4_i_ImageView.setImageResource(R.mipmap.green_tick);
}
else q4_i_ImageView.setImageResource(R.mipmap.red_cross);
if(editTextQ4_ii_Answer.getText().toString().equals(Q4_ii)){
userScore += +1;
q4_ii_ImageView.setImageResource(R.mipmap.green_tick);
}
else q4_ii_ImageView.setImageResource(R.mipmap.red_cross);
if(editTextQ4_iii_Answer.getText().toString().equals(Q4_iii)){
userScore += +1;
q4_iii_ImageView.setImageResource(R.mipmap.green_tick);
}
else q4_iii_ImageView.setImageResource(R.mipmap.red_cross);
if(editTextQ4_iv_Answer.getText().toString().equals(Q4_iv)){
userScore += +1;
q4_iv_ImageView.setImageResource(R.mipmap.green_tick);
}
else q4_iv_ImageView.setImageResource(R.mipmap.red_cross);
// Toast message to user with score
Context context = getApplicationContext();
CharSequence text = "You scored: " + userScore + " out of 11";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
...
}
///
and this is the XML:
///
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:id="@+id/q1"
style="@style/QuestionLabel"
android:text="@string/q1" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"/>
<TextView
android:id="@+id/q1_text"
style="@style/QuestionText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="@string/q1_text"/>
<RadioGroup
android:id="@+id/q1_radio_buttons"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/q1_text">
<RadioButton
android:id="@+id/q1_radioButton_false"
android:text="@string/q1_radio_button_false"/>
<RadioButton
android:id="@+id/q1_radioButton_true"
android:text="@string/q1_radio_button_true"/>
</RadioGroup>
<TextView
android:id="@+id/q2"
style="@style/QuestionLabel"
android:text="@string/q2"/>
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="100dp" />
<TextView
android:id="@+id/q2_text"
style="@style/QuestionText"
android:text="@string/q2_text" />
<EditText
android:id="@+id/q2_editText"
android:hint="@string/user_hint"
android:importantForAutofill="no"
android:inputType="number|text" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="176dp" />
<TextView
android:id="@+id/q3"
style="@style/QuestionLabel"
android:text="@string/q3" />
<TextView
android:id="@+id/q3_text"
style="@style/QuestionText"
android:text="@string/q3_text" />
<CheckBox
android:id="@+id/checkBoxQ3_i"
style="@style/CheckBox"
android:checked="false"
android:text="@string/q3_i" />
<CheckBox
android:id="@+id/checkBoxQ3_ii"
style="@style/CheckBox"
android:checked="false"
android:text="@string/q3_ii" />
<CheckBox
android:id="@+id/checkBoxQ3_iii"
style="@style/CheckBox"
android:checked="false"
android:text="@string/q3_iii" />
<CheckBox
android:id="@+id/checkBoxQ3_iv"
style="@style/CheckBox"/>
<CheckBox
android:id="@+id/checkBoxQ3_v"
style="@style/CheckBox"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginEnd="70dp"
android:layout_marginRight="70dp"
android:checked="false"
android:text="@string/q3_v" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="180dp" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="326dp" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="316dp" />
<TextView
android:id="@+id/q4"
style="@style/QuestionLabel"
android:text="@string/q4"
app:layout_constraintEnd_toStartOf="@+id/guideline"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline6" />
<ImageView
android:id="@+id/q4_imageView3"
android:layout_width="0dp"
android:layout_height="189dp"
android:contentDescription="@string/red_cross"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@id/guideline6"
app:srcCompat="@mipmap/motion_time_graph" />
<TextView
android:id="@+id/q4_text"
style="@style/QuestionText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="@string/q4_text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/q4_imageView3" />
<TextView
android:id="@+id/q4_i_text"
style="@style/QuestionText"
android:layout_width="287dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="@string/q4_i"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/q4_text" />
<EditText
android:id="@+id/q4_i_editBox"
style="@style/Q4EditTextBox"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/guideline5"
app:layout_constraintTop_toBottomOf="@+id/q4_text"
app:layout_constraintTop_toTopOf="@+id/q4_i_text" />
<TextView
android:id="@+id/q4_ii_text"
style="@style/QuestionText"
android:layout_width="291dp"
android:layout_height="36dp"
android:layout_marginTop="10dp"
android:text="@string/q4_ii"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintHorizontal_bias="0.612"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/q4_i_text" />
<EditText
android:id="@+id/q4_ii_editBox"
style="@style/Q4EditTextBox"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/guideline5"
app:layout_constraintTop_toTopOf="@+id/q4_ii_text" />
<TextView
android:id="@+id/q4_iii_text"
style="@style/QuestionText"
android:layout_width="287dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="@string/q4_iii"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintHorizontal_bias="0.612"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/q4_ii_text" />
<EditText
android:id="@+id/q4_iii_editBox"
style="@style/Q4EditTextBox"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/guideline5"
app:layout_constraintTop_toTopOf="@+id/q4_iii_text" />
<TextView
android:id="@+id/q4_iv_text"
style="@style/QuestionText"
android:layout_width="287dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="@string/q4_iv"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintHorizontal_bias="0.612"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/q4_iii_text" />
<EditText
android:id="@+id/q4_iv_editBox"
style="@style/Q4EditTextBox"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/guideline5"
app:layout_constraintTop_toTopOf="@+id/q4_iv_text" />
<Button
android:id="@+id/reset"
style="@style/SubmitResetButton"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="@string/reset"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/guideline4"
app:layout_constraintStart_toStartOf="@+id/guideline"
app:layout_constraintTop_toBottomOf="@+id/guideline7"
app:layout_constraintVertical_bias="0.0"
android:onClick="resetAnswers"/>
<Button
android:id="@+id/submit"
style="@style/SubmitResetButton"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:text="@string/submit"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/guideline5"
app:layout_constraintStart_toStartOf="@+id/guideline4"
app:layout_constraintTop_toBottomOf="@+id/guideline7"
app:layout_constraintVertical_bias="0.0"
android:onClick="showScore"/>
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="734dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
///
