安卓：作为编程onClickListener不起作用 [英] Android: onClickListener does not work as programmed
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问题描述
测验android上：
我设置一个onClickListener要监视的回答按钮pressed，我试图从表中获取正确的答案，以检查是否得分给予与否。
问题是，问题并没有改变（数量在这种情况下）。
Quiz on android: I am setting an onClickListener to monitor which answer button is pressed and i am trying to access the correct answer from a table to check if score is given or not. Problem is question doesnt change(number in this case).
//variables ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private TextView questionBox;
private Button startButton, answerButton1, answerButton2, answerButton3, answerButton4;
private RadioGroup radioGroup1;
private RadioButton difficulty_easy_radio, difficulty_medium_radio, difficulty_hard_radio;
private String difficulty = "easy";
private int score = 0;
int pointer = 0;
public String correct; // QuestionTables.questionTable[pointer].getCorrectAnswer();
//variables ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
startButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId() == startButton.getId())
{
//setting the elements of the layout
setContentView(R.layout.activity_playing);
final View controlsView = findViewById(R.id.fullscreen_content_controls2);
final View contentView = findViewById(R.id.fullscreen_content2);
//connecting layout elements with variables
questionBox = (TextView) findViewById(R.id.question_box);
answerButton1 = (Button) findViewById(R.id.answer_button1);
answerButton2 = (Button) findViewById(R.id.answer_button2);
answerButton3 = (Button) findViewById(R.id.answer_button3);
answerButton4 = (Button) findViewById(R.id.answer_button4);
//changing questions *****"pointer" and "correct" are declared globally to avoid:
//Cannot refer to a non-final variable inside an inner class defined in a different method ERROR*****
// don't forget to i++ as i<QuestionTables.questionTable.length=10
//set first question
QuestionTables.shuffleAnswers(pointer);
questionBox.setText(""+pointer);
answerButton1.setText(QuestionTables.questionAnswers[0]);
answerButton2.setText(QuestionTables.questionAnswers[1]);
answerButton3.setText(QuestionTables.questionAnswers[2]);
answerButton4.setText(QuestionTables.questionAnswers[3]);
correct = QuestionTables.questionTable[pointer].getCorrectAnswer();
//button listener
controlsView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId())
{
case R.id.answer_button1:
{
//check if correct
correct = QuestionTables.questionTable[pointer].getCorrectAnswer();
int clickedId = v.getId();
Button clickedButton = (Button) findViewById(clickedId);
if(clickedButton.getText().equals(correct))
score+=100;
pointer++;
//change question
QuestionTables.shuffleAnswers(pointer);
questionBox.setText(""+pointer);
answerButton1.setText(QuestionTables.questionAnswers[0]);
answerButton2.setText(QuestionTables.questionAnswers[1]);
answerButton3.setText(QuestionTables.questionAnswers[2]);
answerButton4.setText(QuestionTables.questionAnswers[3]);
break;
}
case R.id.answer_button2:
{
//check if correct
correct = QuestionTables.questionTable[pointer].getCorrectAnswer();
int clickedId = v.getId();
Button clickedButton = (Button) findViewById(clickedId);
if(clickedButton.getText().equals(correct))
score+=100;
pointer++;
//change question
QuestionTables.shuffleAnswers(pointer);
questionBox.setText(""+pointer);
answerButton1.setText(QuestionTables.questionAnswers[0]);
answerButton2.setText(QuestionTables.questionAnswers[1]);
answerButton3.setText(QuestionTables.questionAnswers[2]);
answerButton4.setText(QuestionTables.questionAnswers[3]);
break;
}
case R.id.answer_button3:
{
//check if correct
correct = QuestionTables.questionTable[pointer].getCorrectAnswer();
int clickedId = v.getId();
Button clickedButton = (Button) findViewById(clickedId);
if(clickedButton.getText().equals(correct))
score+=100;
pointer++;
//change question
QuestionTables.shuffleAnswers(pointer);
questionBox.setText(""+pointer);
answerButton1.setText(QuestionTables.questionAnswers[0]);
answerButton2.setText(QuestionTables.questionAnswers[1]);
answerButton3.setText(QuestionTables.questionAnswers[2]);
answerButton4.setText(QuestionTables.questionAnswers[3]);
break;
}
case R.id.answer_button4:
{
//check if correct
correct = QuestionTables.questionTable[pointer].getCorrectAnswer();
int clickedId = v.getId();
Button clickedButton = (Button) findViewById(clickedId);
if(clickedButton.getText().equals(correct))
score+=100;
pointer++;
//change question
QuestionTables.shuffleAnswers(pointer);
questionBox.setText(""+pointer);
answerButton1.setText(QuestionTables.questionAnswers[0]);
answerButton2.setText(QuestionTables.questionAnswers[1]);
answerButton3.setText(QuestionTables.questionAnswers[2]);
answerButton4.setText(QuestionTables.questionAnswers[3]);
break;
}
}
}
});
}
}
});
注意startButton是活动的第一个布局时是pssed这种布局$ P $随之而来的。
Note that startButton is in the first layout of the activity and when is pressed this layout comes next.
推荐答案
您有很多code，但我假定这就是问题所在：
You have a lot of code, but I'm assuming that this is the problem:
controlsView.setOnClickListener(new View.OnClickListener() {
您给 controlsView 私人 OnClickListener 然后期望它来处理从点击所有的按钮事件。这将失败，因为其他的按钮不使用这种 OnClickListener 。
You give controlsView a private OnClickListener then expect it to handle click events from all the buttons. This will fail, since the other buttons aren't using this OnClickListener.
请共享监听器。
View.OnClickListener listener = new View.OnClickListener() {//..
然后将其传递给按钮的其余部分。
Then pass it off to the rest of the buttons.
answerButton1.setOnClickListener (listener);
answerButton2.setOnClickListener (listener);
//etc
您还可以使活动实施 OnClickListener 接口。
public class MyActivity extends Activity implements OnClickListener{
@Override
public void onClick (View v)
{
//implementation
}
然后设置 OnClickListener ，传递出活动实例，而不是
answerButton1.setOnClickListener (MyActivity.this);
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