So basically, I have a license quiz android application. After I check all of the questions or only a few of them and press the submit button instead of throwing me the message of how many I did the program just closes with no warning or whatever. After a brief seconds it tells me that the application itself keeps closing.
Import :
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.WindowManager;
import android.widget.CheckBox;
import android.widget.Toast;
Main activity :
public class MainActivity extends AppCompatActivity {
private static final String LOG_TAG = MainActivity.class.getSimpleName();
// Question 1
CheckBox question1_choice1;
CheckBox question1_choice2;
CheckBox question1_choice3;
CheckBox question1_choice4;
CheckBox question1_choice5;
CheckBox question1_choice6;
// Question 2
CheckBox question2_choice1;
CheckBox question2_choice2;
CheckBox question2_choice3;
CheckBox question2_choice4;
// Question 3
CheckBox question3_choice1;
CheckBox question3_choice2;
CheckBox question3_choice3;
// Question 4
CheckBox question4_choice1;
CheckBox question4_choice2;
CheckBox question4_choice3;
CheckBox question4_choice4;
// Question 5
CheckBox question5_choice1;
CheckBox question5_choice2;
CheckBox question5_choice3;
CheckBox question5_choice4;
// Question 6
CheckBox question6_choice1;
CheckBox question6_choice2;
CheckBox question6_choice3;
// Question 7
CheckBox question7_choice1;
CheckBox question7_choice2;
CheckBox question7_choice3;
CheckBox question7_choice4;
// Question 8
CheckBox question8_choice1;
CheckBox question8_choice2;
CheckBox question8_choice3;
CheckBox question8_choice4;
// Question 9
CheckBox question9_choice1;
CheckBox question9_choice2;
CheckBox question9_choice3;
CheckBox question9_choice4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide the keyboard
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
setContentView(R.layout.activity_main);
}
public void submitAnswers(View view) {
CharSequence resultsDisplay;
Log.e(LOG_TAG, " " + this.findViewById(R.id.question3_choice3));
int answer1_score;
int answer2_score;
int answer3_score;
int answer4_score;
int answer5_score;
int answer6_score;
int answer7_score;
int answer8_score;
int answer9_score;
int final_score;
//------------------------------------------------------------------------------------------
// Question 1 - Corect 1 - 4 - 5;
//------------------------------------------------------------------------------------------
Boolean answer1_choice1;
Boolean answer1_choice2;
Boolean answer1_choice3;
Boolean answer1_choice4;
Boolean answer1_choice5;
Boolean answer1_choice6;
question1_choice1 = (CheckBox) this.findViewById(R.id.question1_choice1);
question1_choice2 = (CheckBox) this.findViewById(R.id.question1_choice2);
question1_choice3 = (CheckBox) this.findViewById(R.id.question1_choice3);
question1_choice4 = (CheckBox) this.findViewById(R.id.question1_choice4);
question1_choice5 = (CheckBox) this.findViewById(R.id.question1_choice5);
question1_choice6 = (CheckBox) this.findViewById(R.id.question1_choice6);
answer1_choice1 = question1_choice1.isChecked();
answer1_choice2 = question1_choice2.isChecked();
answer1_choice3 = question1_choice3.isChecked();
answer1_choice4 = question1_choice4.isChecked();
answer1_choice5 = question1_choice5.isChecked();
answer1_choice6 = question1_choice6.isChecked();
if (answer1_choice1 && !answer1_choice2 && !answer1_choice3 && answer1_choice4 && answer1_choice5 && !answer1_choice6) {
answer1_score = 1;
} else {
answer1_score = 0;
}
//------------------------------------------------------------------------------------------
// Question 2 - Corect - 3
//------------------------------------------------------------------------------------------
Boolean answer2_choice1;
Boolean answer2_choice2;
Boolean answer2_choice3;
Boolean answer2_choice4;
question1_choice1 = (CheckBox) this.findViewById(R.id.question2_choice1);
question1_choice2 = (CheckBox) this.findViewById(R.id.question2_choice2);
question1_choice3 = (CheckBox) this.findViewById(R.id.question2_choice3);
question1_choice4 = (CheckBox) this.findViewById(R.id.question2_choice4);
answer2_choice1 = question2_choice1.isChecked();
answer2_choice2 = question2_choice2.isChecked();
answer2_choice3 = question2_choice3.isChecked();
answer2_choice4 = question2_choice4.isChecked();
if (!answer2_choice1 && !answer2_choice2 && answer2_choice3 && !answer2_choice4) {
answer2_score = 1;
} else {
answer2_score = 0;
}
//------------------------------------------------------------------------------------------
// Question 3 - Corect 2
//------------------------------------------------------------------------------------------
Boolean answer3_choice1;
Boolean answer3_choice2;
Boolean answer3_choice3;
question3_choice1 = (CheckBox) this.findViewById(R.id.question3_choice1);
question2_choice2 = (CheckBox) this.findViewById(R.id.question3_choice2);
question3_choice3 = (CheckBox) this.findViewById(R.id.question3_choice3);
answer3_choice1 = question3_choice1.isChecked();
answer3_choice2 = question3_choice2.isChecked();
answer3_choice3 = question3_choice3.isChecked();
if (!answer3_choice1 && answer3_choice2 && !answer3_choice3) {
answer3_score = 1;
} else {
answer3_score = 0;
}
//------------------------------------------------------------------------------------------
// Question 4 - Corect - 4
//------------------------------------------------------------------------------------------
Boolean answer4_choice1;
Boolean answer4_choice2;
Boolean answer4_choice3;
Boolean answer4_choice4;
question4_choice1 = (CheckBox) this.findViewById(R.id.question4_choice1);
question4_choice2 = (CheckBox) this.findViewById(R.id.question4_choice2);
question4_choice3 = (CheckBox) this.findViewById(R.id.question4_choice3);
question4_choice4 = (CheckBox) this.findViewById(R.id.question4_choice4);
answer4_choice1 = question4_choice1.isChecked();
answer4_choice2 = question4_choice2.isChecked();
answer4_choice3 = question4_choice3.isChecked();
answer4_choice4 = question4_choice4.isChecked();
if (!answer4_choice1 && !answer4_choice2 && !answer4_choice3 && answer4_choice4) {
answer4_score = 1;
} else {
answer4_score = 0;
}
//------------------------------------------------------------------------------------------
// Question 5 - Corect - 4
//------------------------------------------------------------------------------------------
Boolean answer5_choice1;
Boolean answer5_choice2;
Boolean answer5_choice3;
Boolean answer5_choice4;
question5_choice1 = (CheckBox) this.findViewById(R.id.question5_choice1);
question5_choice2 = (CheckBox) this.findViewById(R.id.question5_choice2);
question5_choice3 = (CheckBox) this.findViewById(R.id.question5_choice3);
question5_choice4 = (CheckBox) this.findViewById(R.id.question5_choice4);
answer5_choice1 = question5_choice1.isChecked();
answer5_choice2 = question5_choice2.isChecked();
answer5_choice3 = question5_choice3.isChecked();
answer5_choice4 = question5_choice4.isChecked();
if (!answer5_choice1 && !answer5_choice2 && !answer5_choice3 && answer5_choice4) {
answer5_score = 1;
} else {
answer5_score = 0;
}
//------------------------------------------------------------------------------------------
// Question 6 - Corect 3
//------------------------------------------------------------------------------------------
Boolean answer6_choice1;
Boolean answer6_choice2;
Boolean answer6_choice3;
question6_choice1 = (CheckBox) this.findViewById(R.id.question6_choice1);
question6_choice2 = (CheckBox) this.findViewById(R.id.question6_choice2);
question6_choice3 = (CheckBox) this.findViewById(R.id.question6_choice3);
answer6_choice1 = question6_choice1.isChecked();
answer6_choice2 = question6_choice2.isChecked();
answer6_choice3 = question6_choice3.isChecked();
if (!answer6_choice1 && answer6_choice2 && answer6_choice3) {
answer6_score = 1;
} else {
answer6_score = 0;
}
//------------------------------------------------------------------------------------------
// Question 7 - Corect 2 - 4
//------------------------------------------------------------------------------------------
Boolean answer7_choice1;
Boolean answer7_choice2;
Boolean answer7_choice3;
Boolean answer7_choice4;
question7_choice1 = (CheckBox) this.findViewById(R.id.question7_choice1);
question7_choice2 = (CheckBox) this.findViewById(R.id.question7_choice2);
question7_choice3 = (CheckBox) this.findViewById(R.id.question7_choice3);
question7_choice4 = (CheckBox) this.findViewById(R.id.question7_choice4);
answer7_choice1 = question7_choice1.isChecked();
answer7_choice2 = question7_choice2.isChecked();
answer7_choice3 = question7_choice3.isChecked();
answer7_choice4 = question7_choice4.isChecked();
if (!answer7_choice1 && answer7_choice2 && !answer7_choice3 && answer7_choice4) {
answer7_score = 1;
} else {
answer7_score = 0;
}
//------------------------------------------------------------------------------------------
// Question 8 - Correct Answer is "Wrist"
//------------------------------------------------------------------------------------------
Boolean answer8_choice1;
Boolean answer8_choice2;
Boolean answer8_choice3;
Boolean answer8_choice4;
question8_choice1 = (CheckBox) this.findViewById(R.id.question8_choice1);
question8_choice2 = (CheckBox) this.findViewById(R.id.question8_choice2);
question8_choice3 = (CheckBox) this.findViewById(R.id.question8_choice3);
question8_choice4 = (CheckBox) this.findViewById(R.id.question8_choice4);
answer8_choice1 = question8_choice1.isChecked();
answer8_choice2 = question8_choice2.isChecked();
answer8_choice3 = question8_choice3.isChecked();
answer8_choice4 = question8_choice4.isChecked();
if (!answer8_choice1 && !answer8_choice2 && answer8_choice3 && !answer8_choice4) {
answer8_score = 1;
} else {
answer8_score = 0;
}
//------------------------------------------------------------------------------------------
// Question 9 - Correct Answers is #2 "Stalagmites"
//------------------------------------------------------------------------------------------
Boolean answer9_choice1;
Boolean answer9_choice2;
Boolean answer9_choice3;
Boolean answer9_choice4;
question9_choice1 = (CheckBox) this.findViewById(R.id.question9_choice1);
question9_choice2 = (CheckBox) this.findViewById(R.id.question9_choice2);
question9_choice3 = (CheckBox) this.findViewById(R.id.question9_choice3);
question9_choice4 = (CheckBox) this.findViewById(R.id.question9_choice4);
answer9_choice1 = question9_choice1.isChecked();
answer9_choice2 = question9_choice2.isChecked();
answer9_choice3 = question9_choice3.isChecked();
answer9_choice4 = question9_choice4.isChecked();
if (!answer9_choice1 && !answer9_choice2 && !answer9_choice3 && answer9_choice4) {
answer9_score = 1;
} else {
answer9_score = 0;
}
//------------------------------------------------------------------------------------------
// Final Score
//------------------------------------------------------------------------------------------
final_score = answer1_score + answer2_score + answer3_score + answer4_score + answer5_score +
answer6_score + answer7_score + answer8_score + answer9_score;
if (final_score == 9) {
resultsDisplay = "Perfect! Ai rezolvat 9 din 9";
} else {
resultsDisplay = "Ai rezolvat " + final_score + " din 9";
}
Context context = getApplicationContext();
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context, resultsDisplay, duration);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
Main activity.xml :
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="rocks.athrow.android_quiz_app.MainActivity">
<LinearLayout
android:id="@+id/quiz_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin">
<TextView
android:id="@+id/question1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/activity_vertical_margin"
android:text="@string/question1"
android:textColor="@color/primaryText"
android:textSize="18sp" />
<CheckBox
android:id="@+id/question1_choice1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question1_choice1" />
<CheckBox
android:id="@+id/question1_choice2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question1_choice2" />
<CheckBox
android:id="@+id/question1_choice3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question1_choice3" />
<CheckBox
android:id="@+id/question1_choice4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question1_choice4" />
<CheckBox
android:id="@+id/question1_choice5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question1_choice5" />
<CheckBox
android:id="@+id/question1_choice6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question1_choice6" />
<TextView
android:id="@+id/question2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/activity_vertical_margin"
android:text="@string/question2"
android:textColor="@color/primaryText"
android:textSize="18sp" />
<CheckBox
android:id="@+id/question2_choice1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question2_choice1" />
<CheckBox
android:id="@+id/question2_choice2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question2_choice2" />
<CheckBox
android:id="@+id/question2_choice3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question2_choice3" />
<CheckBox
android:id="@+id/question2_choice4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question2_choice4" />
<TextView
android:id="@+id/question3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/activity_vertical_margin"
android:text="@string/question3"
android:textColor="@color/primaryText"
android:textSize="18sp" />
<CheckBox
android:id="@+id/question3_choice1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question3_choice1" />
<CheckBox
android:id="@+id/question3_choice2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question3_choice2" />
<CheckBox
android:id="@+id/question3_choice3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question3_choice3" />
<TextView
android:id="@+id/question4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/activity_vertical_margin"
android:text="@string/question4"
android:textColor="@color/primaryText"
android:textSize="18sp" />
<CheckBox
android:id="@+id/question4_choice1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question4_choice1" />
<CheckBox
android:id="@+id/question4_choice2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question4_choice2" />
<CheckBox
android:id="@+id/question4_choice3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question4_choice3" />
<CheckBox
android:id="@+id/question4_choice4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question4_choice4" />
<TextView
android:id="@+id/question5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/activity_vertical_margin"
android:text="@string/question5"
android:textColor="@color/primaryText"
android:textSize="18sp" />
<CheckBox
android:id="@+id/question5_choice1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question5_choice1" />
<CheckBox
android:id="@+id/question5_choice2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question5_choice2" />
<CheckBox
android:id="@+id/question5_choice3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question5_choice3" />
<CheckBox
android:id="@+id/question5_choice4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question5_choice4" />
<TextView
android:id="@+id/question6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="@dimen/activity_vertical_margin"
android:text="@string/question6"
android:textColor="@color/primaryText"
android:textSize="18sp" />
<CheckBox
android:id="@+id/question6_choice1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question6_choice1" />
<CheckBox
android:id="@+id/question6_choice2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question6_choice2" />
<CheckBox
android:id="@+id/question6_choice3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question6_choice3" />
Log error :
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.widget.CheckBox.isChecked()' on a null object reference
at rocks.athrow.android_quiz_app.MainActivity.submitAnswers(MainActivity.java:128)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:6597)
at android.view.View.performClickInternal(View.java:6574)
at android.view.View.access$3100(View.java:778)
at android.view.View$PerformClick.run(View.java:25885)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
