Android APP编写简单答题器

package com.android.testrecord; 
 
/** 
 * Created by wang on 16-10-19. 
 */ 
public class Question { 
  private int mTextResId; 
  private boolean mAnswerTrue; 
 
  public Question(int textResId, boolean answerTrue) { 
    mTextResId = textResId; 
    mAnswerTrue = answerTrue; 
 
  } 
 
  public int getTextResId() { 
    return mTextResId; 
  } 
 
  public boolean isAnswerTrue() { 
    return mAnswerTrue; 
  } 
 
  public void setTextResId(int textResId) { 
    mTextResId = textResId; 
  } 
 
  public void setAnswerTrue(boolean answerTrue) { 
    mAnswerTrue = answerTrue; 
  } 
} 

package com.android.testrecord; 
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; 
public class QuizActivity extends AppCompatActivity { 
private Button mTrueButton; 
private Button mFalseButton; 
private Button mNextButton; 
private TextView mQuestionTextView; 
private Question[] mQuestionBank = new Question[] { 
new Question(R.string.question_oceans, true), 
new Question(R.string.question_mideast, false), 
new Question(R.string.question_africa, false), 
new Question(R.string.question_americas,true), 
new Question(R.string.question_asia, true), 
}; 
private int mCurrentIndex = 0; 
private void updateQuestion() { 
int question = mQuestionBank[mCurrentIndex].getTextResId(); 
mQuestionTextView.setText(question); 
} 
private void checkAnswer(boolean userProessedTrue) { 
boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue(); 
int messageId = 0; 
if (userProessedTrue == answerIsTrue) 
messageId = R.string.correct_toast; 
else 
messageId = R.string.incorrect_toast; 
Toast.makeText(this, messageId, Toast.LENGTH_SHORT).show(); 
} 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_quiz); 
mQuestionTextView = (TextView) findViewById(R.id.question_test_view); 
// int question = mQuestionBank[mCurrentIndex].getTextResId(); 
// mQuestionTextView.setText(question); 
updateQuestion(); 
mTrueButton = (Button) findViewById(R.id.true_button); 
mTrueButton.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
// Does nothing yet, but soon! 
/* Toast.makeText(QuizActivity.this, 
R.string.incorrect_toast, 
Toast.LENGTH_SHORT).show(); */ 
checkAnswer(true); 
} 
}); 
mFalseButton = (Button) findViewById(R.id.false_button); 
mFalseButton.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
// Does nothing yet, but soon! 
/*  Toast.makeText(QuizActivity.this, 
R.string.correct_toast, 
Toast.LENGTH_SHORT).show(); */ 
checkAnswer(false); 
} 
}); 
mNextButton = (Button) findViewById(R.id.next_button); 
mNextButton.setOnClickListener(new View.OnClickListener() { 
@Override 
public void onClick(View v) { 
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length; 
// int question = mQuestionBank[mCurrentIndex].getTextResId(); 
// mQuestionTextView.setText(question); 
updateQuestion(); 
} 
}); 
} 
} 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:gravity="center" 
android:orientation="vertical"   
<TextView 
android:id="@+id/question_test_view" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:padding="24dp"/  
<LinearLayout 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:orientation="horizontal"  
<Button 
android:id="@+id/true_button" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="@string/true_button"/  
<Button 
android:id="@+id/false_button" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="@string/false_button"/  
</LinearLayout  
<Button 
android:id="@+id/next_button" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="@string/next_button"/  
</LinearLayout  

<resources  
<string name="app_name" GeoQuiz</string  
<string name="question_text"  
Constantinople is the largest city in Turkey. 
</string  
<string name="true_button" True</string  
<string name="false_button" False</string  
<string name="correct_toast" Correct!</string  
<string name="incorrect_toast" Incorrect!</string  
<string name="action_settings" Settings</string  
<string name="next_button" Next</string  
<string name="question_oceans" The Pacific Ocean is larger than the Atlantic Ocean.</string  
<string name="question_mideast" The Suez Canal connects the Red Sea and the Indian Ocean.</string  
<string name="question_africa" The source of the Nile River is in Egypt.</string  
<string name="question_americas" The Amazon River is the longest river in the Americas.</string  
<string name="question_asia" Lake Baikal is the world\'s oldest and deepest freshwater lake.</string  
</resources