Iam尝试使用SQLite创建一个IQTest应用程序。现在我已经添加了5个问题。但是，当我添加第6个问题并运行项目时，应用程序强制关闭。可以有人帮忙吗？
这是Question.java
package com.example.iqtest;
public class Question {
public Question()
{
}
public Question( String question, String opta, String optb, String optc,
String answer) {
super();
this.question=question;
this.opta=opta;
this.optb=optb;
this.optc=optc;
this.answer=answer;
}
public int getid()
{
return this.id;
}
public void setid(int id)
{
this.id=id;
}
public String getquestion() {
return this.question;
}
public void setquestion(String question) {
this.question=question;
}
public String getopta() {
return this.opta;
}
public void setopta(String opta) {
this.opta=opta;
}
public String getoptb() {
return this.optb;
}
public void setoptb(String optb) {
this.optb=optb;
}
public String getoptc() {
return this.optc;
}
public void setoptc(String optc) {
this.optc=optc;
}
public String getanswer() {
return this.answer;
}
public void setanswer(String answer) {
this.answer=answer;
}
}
这是DbHelper.java
package com.example.iqtest;
public class DbHelper extends SQLiteOpenHelper{
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "triviaQuiz";
// tasks table name
private static final String TABLE_QUEST = "quest";
// tasks Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_QUES = "question";
private static final String KEY_ANSWER = "answer"; //correct option
private static final String KEY_OPTA= "opta"; //option a
private static final String KEY_OPTB= "optb"; //option b
private static final String KEY_OPTC= "optc"; //option c
private SQLiteDatabase dbase;
public DbHelper(Context context) {
super(context,DATABASE_NAME,null,DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
dbase=db;
String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_QUEST + " ( "
+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_QUES
+ " TEXT, " + KEY_ANSWER+ " TEXT, "+KEY_OPTA +" TEXT, "
+KEY_OPTB +" TEXT, "+KEY_OPTC+" TEXT)";
db.execSQL(sql);
addQuestions();
//db.close();
}
private void addQuestions()
{
Question q1=new Question("Which company is the largest manufacturer" +
" of network equipment?","HP", "IBM", "CISCO", "CISCO");
this.addQuestion(q1);
Question q2=new Question("Which of the following is NOT " +
"an operating system?", "SuSe", "BIOS", "DOS", "BIOS");
this.addQuestion(q2);
Question q3=new Question("Which of the following is the fastest" +
" writable memory?","RAM", "FLASH","Register","Register");
this.addQuestion(q3);
Question q4=new Question("Which of the following device" +
" regulates internet traffic?", "Router", "Bridge", "Hub","Router");
this.addQuestion(q4);
Question q5=new Question("Which of the following is NOT an" +
" interpreted language?","Ruby","Python","BASIC","BASIC");
this.addQuestion(q5);
Question q6=new Question("Which of the following is NOT an" +
" interpreted languaget?","Rubyt","Pythont","BASICt","BASICt");
this.addQuestion(q6);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldV, int newV) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_QUEST);
// Create tables again
onCreate(db);
}
// Adding new question
public void addQuestion(Question quest) {
//SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_QUES, quest.getquestion());
values.put(KEY_ANSWER, quest.getanswer());
values.put(KEY_OPTA, quest.getopta());
values.put(KEY_OPTB, quest.getoptb());
values.put(KEY_OPTC, quest.getoptc());
// Inserting Row
dbase.insert(TABLE_QUEST, null, values);
}
public List<Question> getAllQuestions() {
List<Question> quesList = new ArrayList<Question>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_QUEST;
dbase=this.getReadableDatabase();
Cursor cursor = dbase.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Question quest = new Question();
quest.setid(cursor.getInt(0));
quest.setquestion(cursor.getString(1));
quest.setanswer(cursor.getString(2));
quest.setopta(cursor.getString(3));
quest.setoptb(cursor.getString(4));
quest.setoptc(cursor.getString(5));
quesList.add(quest);
} while (cursor.moveToNext());
}
// return quest list
return quesList;
}
public int rowcount()
{
int row=0;
String selectQuery = "SELECT * FROM " + TABLE_QUEST;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
row=cursor.getCount();
return row;
}
}
这是QuizActivity.java
package com.example.iqtest;
public class QuizActivity extends Activity {
List<Question> quesList;
int score=0;
int qid=0;
Question currentQ;
TextView txtQuestion;
RadioButton rda, rdb, rdc;
Button butNext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
DbHelper db=new DbHelper(this);
quesList=db.getAllQuestions();
currentQ=quesList.get(qid);
txtQuestion=(TextView)findViewById(R.id.textView1);
rda=(RadioButton)findViewById(R.id.radio0);
rdb=(RadioButton)findViewById(R.id.radio1);
rdc=(RadioButton)findViewById(R.id.radio2);
butNext=(Button)findViewById(R.id.button1);
setQuestionView();
butNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
RadioGroup grp=(RadioGroup)findViewById(R.id.radioGroup1);
RadioButton answer=(RadioButton)findViewById(grp.getCheckedRadioButtonId());
Log.d("yourans", currentQ.getanswer()+" "+answer.getText());
if(currentQ.getanswer().equals(answer.getText()))
{
score++;
Log.d("score", "Your score"+score);
}
if(qid<5){
currentQ=quesList.get(qid);
setQuestionView();
}else{
Intent intent = new Intent(QuizActivity.this, ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); //Your score
intent.putExtras(b); //Put your score to your next Intent
startActivity(intent);
finish();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.quiz, menu);
return true;
}
private void setQuestionView()
{
txtQuestion.setText(currentQ.getquestion());
rda.setText(currentQ.getopta());
rdb.setText(currentQ.getoptb());
rdc.setText(currentQ.getoptc());
qid++;
}
}
这是ResultActivity.java
package com.example.iqtest;
public class ResultActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
//get rating bar object
RatingBar bar=(RatingBar)findViewById(R.id.ratingBar1);
bar.setNumStars(5);
bar.setStepSize(0.5f);
//get text view
TextView t=(TextView)findViewById(R.id.textResult);
//get score
Bundle b = getIntent().getExtras();
int score= b.getInt("score");
//display score
bar.setRating(score);
switch (score)
{
case 1:
case 2: t.setText("Oopsie! Better Luck Next Time!");
break;
case 3:
case 4:t.setText("Hmmmm.. Someone's been reading a lot of trivia");
break;
case 5:t.setText("Who are you? A trivia wizard???");
break;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.result, menu);
return true;
}
}
答案 0 :(得分：1)
希望这个暗示可能会对你有所帮助
您的代码包含..当您在第6个问题中转移到其他部分时。
if(qid<5){
currentQ=quesList.get(qid);
setQuestionView();
}else{
Intent intent = new Intent(QuizActivity.this, ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); //Your score
intent.putExtras(b); //Put your score to your next Intent
startActivity(intent);
finish();
}
您初始化QuizActivity活动的上下文并通过意图传递它。
public QuizActivity extends Activity{
Context context;
onCreate(){
context = this;
..........
.........
else{
Intent intent = new Intent(context, ResultActivity.class);
Bundle b = new Bundle();
b.putInt("score", score); //Your score
intent.putExtras(b); //Put your score to your next Intent
startActivity(intent);
finish();
}
}
}
并检查 AnroidManifest.xml 文件中是否存在 ResultActivity 。