为什么我一次只调用一次 TextViews 中的文本会更改两次?
Why is the text in TextViews changing two times when I am calling it only once at a time?
我知道 setText
只更改了一次文本,但在我继续 quizActivity
[ 中的下一个问题之前,我似乎无法找到其中文本更改的原因=20=]
我做的是一个应用程序,里面有一个 activity,里面有一个测验,一个问题和 4 个选项一起显示。当用户选择一个选项时,如果该选项正确,则它变为绿色和红色,否则,我会打开一个对话框,显示答案是对还是错,然后当用户单击 Next
在对话框上。
但是,当用户选择一个选项时,在单击该选项然后单击对话框中的下一步的过程中,问题和选项中的文本发生了变化,我似乎无法弄清楚为什么会这样。总共,问题和选项改变了两次,而它们应该只改变一次,意外的改变是当用户点击一个选项并打开对话框时。
代码如下:
@Override
public void onClick(View view) {
int selectedOption = 0;
switch (view.getId()) {
case R.id.option_1_tile:
selectedOption = 1;
break;
case R.id.option_2_tile:
selectedOption = 2;
break;
case R.id.option_3_tile:
selectedOption = 3;
break;
case R.id.option_4_tile:
selectedOption = 4;
break;
default:
}
checkAnswer(selectedOption, view);
}
这是检查答案的函数:
private void checkAnswer(int selectedOption, View view) {
if (selectedOption == selected_questions.get(quesNum).getAnswer()) {
//Right Answer
(view).setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
quizReference.child(selected_questions.get(quesNum).getId()).child("correct_attempts").setValue(String.valueOf(Integer.valueOf(selected_questions.get(quesNum).getCorrect_attempts()) + 1));
quizReference.child(selected_questions.get(quesNum).getId()).child("total_attempts").setValue(String.valueOf(Integer.valueOf(selected_questions.get(quesNum).getTotal_attempts()) + 1));
score++;
correctDialog();
} else {
//Wrong Answer
(view).setBackgroundTintList(ColorStateList.valueOf(Color.RED));
quizReference.child(selected_questions.get(quesNum).getId()).child("total_attempts").setValue(String.valueOf(Integer.valueOf(selected_questions.get(quesNum).getTotal_attempts()) + 1));
switch (selected_questions.get(quesNum).getAnswer()) {
case 1:
options[0].setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
break;
case 2:
options[1].setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
break;
case 3:
options[2].setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
break;
case 4:
options[3].setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
break;
}
wrongDialog ();
}
}
这是改变问题的函数:
private void changeQuestion() {
resetColor ();
if (quesNum < selected_questions.size() - 1) {
quesNum++;
playAnim(question, 0, 0);
playAnim(option1_text, 0, 1);
playAnim(option2_text, 0, 2);
playAnim(option3_text, 0, 3);
playAnim(option4_text, 0, 4);
qCount.setText(String.valueOf(quesNum + 1) + "/" + String.valueOf(selected_questions.size()));
} else {
// Go to Score Activity
Intent intent = new Intent(quizActivity.this, scoreActivity.class);
intent.putExtra("SCORE", String.valueOf(score) + "/" + String.valueOf(selected_questions.size()));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
}
这是设置文本和动画的函数:
private void playAnim(final View view, final int value, final int viewNum) {
view.animate().alpha(value).scaleX(value).scaleY(value).setDuration(500)
.setStartDelay(100).setInterpolator(new DecelerateInterpolator())
.setListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
if (value == 0) {
switch (viewNum) {
case 0:
((TextView) view).setText(selected_questions.get(quesNum).getQuestion());
break;
case 1:
((TextView) view).setText(selected_questions.get(quesNum).getOption1());
break;
case 2:
((TextView) view).setText(selected_questions.get(quesNum).getOption2());
break;
case 3:
((TextView) view).setText(selected_questions.get(quesNum).getOption3());
break;
case 4:
((TextView) view).setText(selected_questions.get(quesNum).getOption4());
break;
}
if (viewNum != 0)
(view).setBackgroundTintList(ColorStateList.valueOf(Color.parseColor("#E99C03")));
playAnim(view, 1, viewNum);
}
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
}
这是对话框的代码:
public void wrongDialog() {
final Dialog dialogWrong = new Dialog(quizActivity.this);
dialogWrong.requestWindowFeature(Window.FEATURE_NO_TITLE);
if (dialogWrong.getWindow() != null) {
ColorDrawable colorDrawable = new ColorDrawable(Color.TRANSPARENT);
dialogWrong.getWindow().setBackgroundDrawable(colorDrawable);
}
dialogWrong.setContentView(R.layout.dialog_wrong);
dialogWrong.setCancelable(false);
dialogWrong.show();
TextView wrongText = (TextView) dialogWrong.findViewById(R.id.wrongText);
Button buttonNext = (Button) dialogWrong.findViewById(R.id.dialogNext);
//OnCLick listener to go next que
buttonNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//This will dismiss the dialog
dialogWrong.dismiss();
//reset the color of buttons back to white
resetColor();
//Change question
changeQuestion();
}
});
}
public void correctDialog() {
final Dialog dialogCorrect = new Dialog(quizActivity.this);
dialogCorrect.requestWindowFeature(Window.FEATURE_NO_TITLE);
if (dialogCorrect.getWindow() != null) {
ColorDrawable colorDrawable = new ColorDrawable(Color.TRANSPARENT);
dialogCorrect.getWindow().setBackgroundDrawable(colorDrawable);
}
dialogCorrect.setContentView(R.layout.dialog_correct);
dialogCorrect.setCancelable(false);
dialogCorrect.show();
TextView correctText = (TextView) dialogCorrect.findViewById(R.id.correctText);
Button buttonNext = (Button) dialogCorrect.findViewById(R.id.dialogNext);
//OnCLick listener to go next que
buttonNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//This will dismiss the dialog
dialogCorrect.dismiss();
//reset the color of buttons back to white
resetColor();
//it will increment the question number
changeQuestion();
}
});
}
尽管我很乐意回答您可能想要的任何其他 information/code,但我已尽力解释它。此外,如果您有时间 运行 并更好地理解问题,这个 is the link 项目。
我已经检查了你的代码。您在 setUpdates 方法中放置了一个 addValueEventListener。当您 select 一个选项时,您可以通过设置总尝试次数等字段来更新 firestore 数据库。结果,触发了 eventListener 并调用了“selectQuestionSet”函数。
因此,每次 select 一个选项时,都会调用 selectQuestionSet 函数。你应该确保它在开始时只调用一次。
我知道 setText
只更改了一次文本,但在我继续 quizActivity
[ 中的下一个问题之前,我似乎无法找到其中文本更改的原因=20=]
我做的是一个应用程序,里面有一个 activity,里面有一个测验,一个问题和 4 个选项一起显示。当用户选择一个选项时,如果该选项正确,则它变为绿色和红色,否则,我会打开一个对话框,显示答案是对还是错,然后当用户单击 Next
在对话框上。
但是,当用户选择一个选项时,在单击该选项然后单击对话框中的下一步的过程中,问题和选项中的文本发生了变化,我似乎无法弄清楚为什么会这样。总共,问题和选项改变了两次,而它们应该只改变一次,意外的改变是当用户点击一个选项并打开对话框时。
代码如下:
@Override
public void onClick(View view) {
int selectedOption = 0;
switch (view.getId()) {
case R.id.option_1_tile:
selectedOption = 1;
break;
case R.id.option_2_tile:
selectedOption = 2;
break;
case R.id.option_3_tile:
selectedOption = 3;
break;
case R.id.option_4_tile:
selectedOption = 4;
break;
default:
}
checkAnswer(selectedOption, view);
}
这是检查答案的函数:
private void checkAnswer(int selectedOption, View view) {
if (selectedOption == selected_questions.get(quesNum).getAnswer()) {
//Right Answer
(view).setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
quizReference.child(selected_questions.get(quesNum).getId()).child("correct_attempts").setValue(String.valueOf(Integer.valueOf(selected_questions.get(quesNum).getCorrect_attempts()) + 1));
quizReference.child(selected_questions.get(quesNum).getId()).child("total_attempts").setValue(String.valueOf(Integer.valueOf(selected_questions.get(quesNum).getTotal_attempts()) + 1));
score++;
correctDialog();
} else {
//Wrong Answer
(view).setBackgroundTintList(ColorStateList.valueOf(Color.RED));
quizReference.child(selected_questions.get(quesNum).getId()).child("total_attempts").setValue(String.valueOf(Integer.valueOf(selected_questions.get(quesNum).getTotal_attempts()) + 1));
switch (selected_questions.get(quesNum).getAnswer()) {
case 1:
options[0].setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
break;
case 2:
options[1].setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
break;
case 3:
options[2].setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
break;
case 4:
options[3].setBackgroundTintList(ColorStateList.valueOf(Color.GREEN));
break;
}
wrongDialog ();
}
}
这是改变问题的函数:
private void changeQuestion() {
resetColor ();
if (quesNum < selected_questions.size() - 1) {
quesNum++;
playAnim(question, 0, 0);
playAnim(option1_text, 0, 1);
playAnim(option2_text, 0, 2);
playAnim(option3_text, 0, 3);
playAnim(option4_text, 0, 4);
qCount.setText(String.valueOf(quesNum + 1) + "/" + String.valueOf(selected_questions.size()));
} else {
// Go to Score Activity
Intent intent = new Intent(quizActivity.this, scoreActivity.class);
intent.putExtra("SCORE", String.valueOf(score) + "/" + String.valueOf(selected_questions.size()));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
}
这是设置文本和动画的函数:
private void playAnim(final View view, final int value, final int viewNum) {
view.animate().alpha(value).scaleX(value).scaleY(value).setDuration(500)
.setStartDelay(100).setInterpolator(new DecelerateInterpolator())
.setListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
if (value == 0) {
switch (viewNum) {
case 0:
((TextView) view).setText(selected_questions.get(quesNum).getQuestion());
break;
case 1:
((TextView) view).setText(selected_questions.get(quesNum).getOption1());
break;
case 2:
((TextView) view).setText(selected_questions.get(quesNum).getOption2());
break;
case 3:
((TextView) view).setText(selected_questions.get(quesNum).getOption3());
break;
case 4:
((TextView) view).setText(selected_questions.get(quesNum).getOption4());
break;
}
if (viewNum != 0)
(view).setBackgroundTintList(ColorStateList.valueOf(Color.parseColor("#E99C03")));
playAnim(view, 1, viewNum);
}
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
}
这是对话框的代码:
public void wrongDialog() {
final Dialog dialogWrong = new Dialog(quizActivity.this);
dialogWrong.requestWindowFeature(Window.FEATURE_NO_TITLE);
if (dialogWrong.getWindow() != null) {
ColorDrawable colorDrawable = new ColorDrawable(Color.TRANSPARENT);
dialogWrong.getWindow().setBackgroundDrawable(colorDrawable);
}
dialogWrong.setContentView(R.layout.dialog_wrong);
dialogWrong.setCancelable(false);
dialogWrong.show();
TextView wrongText = (TextView) dialogWrong.findViewById(R.id.wrongText);
Button buttonNext = (Button) dialogWrong.findViewById(R.id.dialogNext);
//OnCLick listener to go next que
buttonNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//This will dismiss the dialog
dialogWrong.dismiss();
//reset the color of buttons back to white
resetColor();
//Change question
changeQuestion();
}
});
}
public void correctDialog() {
final Dialog dialogCorrect = new Dialog(quizActivity.this);
dialogCorrect.requestWindowFeature(Window.FEATURE_NO_TITLE);
if (dialogCorrect.getWindow() != null) {
ColorDrawable colorDrawable = new ColorDrawable(Color.TRANSPARENT);
dialogCorrect.getWindow().setBackgroundDrawable(colorDrawable);
}
dialogCorrect.setContentView(R.layout.dialog_correct);
dialogCorrect.setCancelable(false);
dialogCorrect.show();
TextView correctText = (TextView) dialogCorrect.findViewById(R.id.correctText);
Button buttonNext = (Button) dialogCorrect.findViewById(R.id.dialogNext);
//OnCLick listener to go next que
buttonNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//This will dismiss the dialog
dialogCorrect.dismiss();
//reset the color of buttons back to white
resetColor();
//it will increment the question number
changeQuestion();
}
});
}
尽管我很乐意回答您可能想要的任何其他 information/code,但我已尽力解释它。此外,如果您有时间 运行 并更好地理解问题,这个 is the link 项目。
我已经检查了你的代码。您在 setUpdates 方法中放置了一个 addValueEventListener。当您 select 一个选项时,您可以通过设置总尝试次数等字段来更新 firestore 数据库。结果,触发了 eventListener 并调用了“selectQuestionSet”函数。
因此,每次 select 一个选项时,都会调用 selectQuestionSet 函数。你应该确保它在开始时只调用一次。