Simple App Crashs

Question

Hey, ich baue ein Mathe-Spiel aus einem Lehrbuch. Ich hatte eine ähnliche Frage gestellt, und die Deinstallation und Neuinstallation von Android half, lief der gleiche Code. Jetzt bin ich weiter im Code und kann keinen Fehler finden. Ich habe das Gefühl, es könnte die Platzierung meiner Methode setQuestion() in der onClick-Methode von GameActivity.java sein. Außerdem werden die Punkte und Level-Elemente nicht aktualisiert, nicht sicher, ob das ein Teil des Problems ist, aber ich habe das Gefühl, dass der Code gerade abstürzt, bevor er sie aktualisiert. Wird ausgeführt (sowohl in einem Emulator als auch auf meinem Telefon), bis der Benutzer eine Antwort auswählt und dann abstürzt. Hier ist mein Code:

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 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" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.baylamafia.snzyt.mathgamechapter2.MainActivity"> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="My Math Game" 
    android:id="@+id/textView" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" 
    android:textSize="30sp" /> 

<ImageView 
    android:layout_width="150dp" 
    android:layout_height="150dp" 
    android:id="@+id/imageView" 
    android:layout_below="@+id/textView" 
    android:layout_centerHorizontal="true" 
    android:layout_marginTop="20dp" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Play" 
    android:id="@+id/buttonPlay" 
    android:layout_centerVertical="true" 
    android:layout_alignEnd="@+id/button2" 
    android:layout_alignStart="@+id/button2" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="High Scores" 
    android:id="@+id/button2" 
    android:layout_below="@+id/buttonPlay" 
    android:layout_centerHorizontal="true" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Quit" 
    android:id="@+id/button3" 
    android:layout_below="@+id/button2" 
    android:layout_alignStart="@+id/button2" 
    android:layout_alignEnd="@+id/button2" /> 

MainActivity.java

package com.baylamafia.snzyt.mathgamechapter2; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 

public class MainActivity extends AppCompatActivity implements  View.OnClickListener{ 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Button buttonPlay = (Button)findViewById(R.id.buttonPlay); 
     buttonPlay.setOnClickListener(this); 
    } 

    @Override 
    public void onClick(View view) { 
     Intent i; 
     i = new Intent(this, GameActivity.class); 
     startActivity(i); 
    } 
} 

activity_game.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 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" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="com.baylamafia.snzyt.mathgamechapter2.GameActivity"> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="2" 
    android:id="@+id/textPartA" 
    android:textSize="70sp" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentStart="true" 
    android:layout_alignBottom="@+id/textOperator" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="x" 
    android:id="@+id/textOperator" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" 
    android:textSize="70sp" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="2" 
    android:id="@+id/textPartB" 
    android:textSize="70sp" 
    android:layout_alignTop="@+id/textOperator" 
    android:layout_alignParentEnd="true" 
    android:layout_alignBottom="@+id/textOperator" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="=" 
    android:id="@+id/textView2" 
    android:textIsSelectable="true" 
    android:layout_below="@+id/textOperator" 
    android:layout_centerHorizontal="true" 
    android:layout_marginTop="50dp" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="3" 
    android:id="@+id/buttonChoice1" 
    android:layout_alignTop="@+id/buttonChoice2" 
    android:layout_toStartOf="@+id/buttonChoice2" 
    android:textSize="40sp" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="4" 
    android:id="@+id/buttonChoice2" 
    android:layout_alignParentBottom="true" 
    android:layout_centerHorizontal="true" 
    android:layout_marginBottom="164dp" 
    android:textSize="40sp" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="7" 
    android:id="@+id/buttonChoice3" 
    android:layout_alignTop="@+id/buttonChoice2" 
    android:layout_toEndOf="@+id/buttonChoice2" 
    android:textSize="40sp" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="Score: 999" 
    android:id="@+id/textScore" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentStart="true" /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="Level: 4" 
    android:id="@+id/textLevel" 
    android:layout_alignTop="@+id/textScore" 
    android:layout_alignEnd="@+id/textPartB" /> 

GameActivity.java

package com.baylamafia.snzyt.mathgamechapter2; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.Toast; 

import org.w3c.dom.Text; 

import java.util.Random; 

public class GameActivity extends AppCompatActivity implements  View.OnClickListener{ 

    int correctAnswer; 
    Button buttonObjectChoice1; 
    Button buttonObjectChoice2; 
    Button buttonObjectChoice3; 
    TextView textObjectPartA; 
    TextView textObjectPartB; 
    TextView textObjectScore; 
    TextView textObjectLevel; 
    int currentScore = 0; 
    int currentLevel = 1; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_game); 

    /*here we get a working object based on either the button or TextView class and base as well 
    as link our new objects directly to the appropriate UI elements that we created previously 
    */ 

     textObjectPartA = 
       (TextView)findViewById(R.id.textPartA); 

     textObjectPartB = 
       (TextView)findViewById(R.id.textPartB); 

     buttonObjectChoice1 = 
       (Button)findViewById(R.id.buttonChoice1); 

     buttonObjectChoice2 = 
       (Button)findViewById(R.id.buttonChoice2); 

     buttonObjectChoice3 = 
       (Button)findViewById(R.id.buttonChoice3); 

     buttonObjectChoice1.setOnClickListener(this); 
     buttonObjectChoice2.setOnClickListener(this); 
     buttonObjectChoice3.setOnClickListener(this); 

     setQuestion(); 
    } 

    void setQuestion(){ 
    //generate the parts of the question 
     int numberRange = currentLevel * 3; 
     Random randInt = new Random(); 

     int partA = randInt.nextInt(numberRange); 
     partA++; 

     int partB = randInt.nextInt(numberRange); 
     partB++; 

     correctAnswer = partA * partB; 
     int wrongAnswer1 = correctAnswer-2; 
     int wrongAnswer2 = correctAnswer+2; 

     textObjectPartA.setText(""+partA); 
     textObjectPartB.setText(""+partB); 

    //set the multi choice button 

     int buttonLayout = randInt.nextInt(3); 
     switch (buttonLayout){ 

      case 0: 
       buttonObjectChoice1.setText(""+correctAnswer); 
       buttonObjectChoice2.setText(""+wrongAnswer1); 
       buttonObjectChoice3.setText(""+wrongAnswer2); 
       break; 

      case 1: 
       buttonObjectChoice1.setText(""+wrongAnswer1); 
       buttonObjectChoice2.setText(""+correctAnswer); 
       buttonObjectChoice3.setText(""+wrongAnswer2); 
       break; 

      case 2: 
       buttonObjectChoice1.setText(""+wrongAnswer1); 
       buttonObjectChoice2.setText(""+wrongAnswer2); 
       buttonObjectChoice3.setText(""+correctAnswer); 
       break; 

     } 
    } 

    void updateScoreAndLevel (int answerGiven) { 

     if(isCorrect(answerGiven)){ 
      for(int i = 1; i < currentLevel; i++){ 
       currentScore = currentScore + i; 
      } 

      currentLevel++; 

     }else{ 
      currentScore = 0; 
      currentLevel = 1; 
     } 

     textObjectScore.setText("Score: " + currentScore); 
     textObjectLevel.setText("Level: " + currentLevel); 
    } 

    boolean isCorrect(int answerGiven){ 
     boolean correctTrueOrFalse; 
     if (answerGiven == correctAnswer){ 
      Toast.makeText(getApplicationContext(), "Well done!",  Toast.LENGTH_LONG).show(); 
      correctTrueOrFalse=true; 
     }else{ 
      Toast.makeText(getApplicationContext(), "Sorry", Toast.LENGTH_LONG).show(); 
      correctTrueOrFalse=false; 
     } 

     return correctTrueOrFalse; 
    } 

    @Override 
    public void onClick(View view){ 
     int answerGiven = 0; 
     switch (view.getId()) { 

      case R.id.buttonChoice1: 
       answerGiven = Integer.parseInt("" + buttonObjectChoice1.getText()); 
       break; 

      case R.id.buttonChoice2: 
       answerGiven = Integer.parseInt("" + buttonObjectChoice2.getText()); 
       break; 

      case R.id.buttonChoice3: 
       answerGiven = Integer.parseInt("" + buttonObjectChoice3.getText()); 
       break; 

     } 

     updateScoreAndLevel(answerGiven); 
     setQuestion(); 
    } 


} 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.baylamafia.snzyt.mathgamechapter2"> 

<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
    <activity android:name=".MainActivity"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity android:name=".GameActivity"></activity> 
</application> 

Answer 1

Sie getApplicationContext hier nicht verwenden:

Toast.makeText(getApplicationContext(), "Well done!",  Toast.LENGTH_LONG).show(); 

Verwenden this die aktuelle Aktivität zu verwenden:

Toast.makeText(this, "Well done!",  Toast.LENGTH_LONG).show(); 

Difference between getContext() , getApplicationContext() , getBaseContext() and "this"

Für den Anfang all dieser Fremd ""+ sie dienen keinen Zweck loszuwerden. Sie fügen nichts zur Saite:

buttonObjectChoice1.setText(""+correctAnswer); 

answerGiven = Integer.parseInt("" + buttonObjectChoice1.getText()); 

Auch dieses

answerGiven = Integer.parseInt("" + buttonObjectChoice1.getText()); 

wird scheitern, wenn es nicht der richtige Eingang d int ist.

Auch ich bin mir nicht sicher, was Sie das für import org.w3c.dom.Text verwenden.