我正在编写我的第一个 Android 应用程序。
我正在尝试创建一个测验应用程序。我有一些问题存储在 SQLite 数据库中，这些问题一个接一个地显示。
用户选择一个答案(单选按钮)，然后单击“下一步按钮”，然后显示下一个问题，依此类推。
以下代码显示我的 Activity 文件一个接一个地显示每个问题，该文件完美运行。
public class ACEActivity extends Activity {
List<Question> quesList;
int score = 0;
int qid = 0;
Question currentQ;
TextView txtQuestion;
RadioButton rda, rdb, rdc, rdd;
Button butNext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
DatabaseHelper db = new DatabaseHelper(this);
quesList = db.getAllACEQuestions();
currentQ = quesList.get(qid);
txtQuestion = (TextView)findViewById(R.id.textView);
rda = (RadioButton)findViewById(R.id.radio0);
rdb = (RadioButton)findViewById(R.id.radio1);
rdc = (RadioButton)findViewById(R.id.radio2);
rdd = (RadioButton)findViewById(R.id.radio3);
butNext = (Button)findViewById(R.id.nextButton);
setQuestionView();
butNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
RadioGroup grp = (RadioGroup)findViewById(R.id.radioGroup);
RadioButton answer = (RadioButton)findViewById(grp.getCheckedRadioButtonId());
Log.d("yourans", currentQ.getANSWER() + " " + answer.getText());
// If the correct answer was clicked display the next question
if(currentQ.getANSWER().equals(answer.getText())) {
currentQ = quesList.get(qid);
setQuestionView();
}
}
});
}
// Load the next question
private void setQuestionView() {
txtQuestion.setText(currentQ.getQUESTION());
rda.setText(currentQ.getOPTA());
rdb.setText(currentQ.getOPTB());
rdc.setText(currentQ.getOPTC());
rdd.setText(currentQ.getOPTD());
qid++;
}
}
显示反馈 Activity 后，我想返回此 Activity 并显示下一个问题。
我尝试通过将问题 ID 从反馈 Activity (ACECorrectActivity) 传递到此 Activity (ACEActivity) 来实现此目的，但没有成功。
<小时/> 我如何尝试解决这个问题:
ACEActivity(新版本，仅针对第一个问题)
public class ACEActivity extends Activity {
List<Question> quesList;
int score = 0;
int qid = 0;
Question currentQ;
TextView txtQuestion;
RadioButton rda, rdb, rdc, rdd;
Button checkBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
// THIS PART IS NEW ================================
// Get the intent
Intent intent = getIntent();
// Get the question id (if there are any extras)
Bundle extras = intent.getExtras();
if (extras != null) {
int qid = extras.getInt("nextQuestionID");
} else {
int qid = 0;
}
// ==================================================
DatabaseHelper db = new DatabaseHelper(this);
quesList = db.getAllACEQuestions();
currentQ = quesList.get(qid);
txtQuestion = (TextView)findViewById(R.id.textView);
rda = (RadioButton)findViewById(R.id.radio0);
rdb = (RadioButton)findViewById(R.id.radio1);
rdc = (RadioButton)findViewById(R.id.radio2);
rdd = (RadioButton)findViewById(R.id.radio3);
checkBtn = (Button) findViewById(R.id.checkButton);
setQuestionView(qid);
checkBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
RadioGroup grp = (RadioGroup) findViewById(R.id.radioGroup);
RadioButton answer = (RadioButton) findViewById(grp.getCheckedRadioButtonId());
Log.d("yourans", currentQ.getANSWER() + " " + answer.getText());
// THIS PART IS NEW AND WORKING FINE ================================
// If the correct answer was clicked
if (currentQ.getANSWER().equals(answer.getText())) {
Intent intent = new Intent(ACEActivity.this, CorrectACEActivity.class);
startActivity(intent);
// If the wrong answer was clicked
} else {
Intent intent = new Intent(ACEActivity.this, FalseACEActivity.class);
startActivity(intent);
}
}
});
}
private void setQuestionView() {
txtQuestion.setText(currentQ.getQUESTION());
rda.setText(currentQ.getOPTA());
rdb.setText(currentQ.getOPTB());
rdc.setText(currentQ.getOPTC());
rdd.setText(currentQ.getOPTD());
qid++;
}
}
ACECorrectActivity(选择正确答案并在 ACEActivity 中单击下一步按钮时加载反馈 Activity )
public class CorrectACEActivity extends Activity {
List<Question> quesList;
int score = 0;
int qid = 0;
Question currentQ;
TextView txtQuestion;
RadioButton rda, rdb, rdc, rdd;
Button nextBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_correct);
DatabaseHelper db = new DatabaseHelper(this);
quesList = db.getAllACEQuestions();
currentQ = quesList.get(qid);
txtQuestion = (TextView) findViewById(R.id.textView);
rda = (RadioButton) findViewById(R.id.radio0);
rdb = (RadioButton) findViewById(R.id.radio1);
rdc = (RadioButton) findViewById(R.id.radio2);
rdd = (RadioButton) findViewById(R.id.radio3);
nextBtn = (Button) findViewById(R.id.nextButton);
// Set colors according to correct answer
rda.setBackgroundColor(Color.RED);
rdb.setBackgroundColor(Color.RED);
rdc.setBackgroundColor(Color.RED);
rdd.setBackgroundColor(Color.RED);
if(currentQ.getANSWER().equals(currentQ.getOPTA())) {
rda.setBackgroundColor(Color.GREEN);
} else if(currentQ.getANSWER().equals(currentQ.getOPTB())) {
rdb.setBackgroundColor(Color.GREEN);
} else if(currentQ.getANSWER().equals(currentQ.getOPTC())) {
rdc.setBackgroundColor(Color.GREEN);
} else if(currentQ.getANSWER().equals(currentQ.getOPTD())) {
rdd.setBackgroundColor(Color.GREEN);
}
setQuestionView();
// WHEN NEXT BUTTON IS CLICKED RETURN TO ACEActivity AND LOAD NEXT QUESTION
nextBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(CorrectACEActivity.this, ACEActivity.class);
intent.putExtra("nextQuestionID", currentQ + 1);
startActivity(intent);
}
});
}
private void setQuestionView() {
txtQuestion.setText(currentQ.getQUESTION());
rda.setText(currentQ.getOPTA());
rdb.setText(currentQ.getOPTB());
rdc.setText(currentQ.getOPTC());
rdd.setText(currentQ.getOPTD());
qid++;
}
}
第一个问题完美。然而，当我回答第一个问题后返回 ACEActivity 时，我又遇到了第一个问题。
正如您所看到的，我对此非常陌生，并且非常乐意提供任何帮助!谢谢!!
最佳答案
intent.putExtra("nextQuestionID", currentQ + 1);
你在 CorrectACEActivity 中设置了额外的错误，不应该是这样吗？
intent.putExtra("nextQuestionID", qid+ 1);
关于java - 显示下一个数据库条目，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40132501/