试图阻止ArrayList加倍方法调用

Question

我有一个由ArrayList填充的lineGraph。我在一个屏幕上显示6个图表，每个图表由方法调用/切换语句触发。问题是，当调用下一个图表时，它仍然具有上一个图表中的信息，因此它“加倍”并继续执行此操作，直到程序崩溃为止。我实际上对编码没有经验，我希望有人可以看看我的代码并查明我的逻辑错误。

请在下面查看我的代码段。

 private ArrayList<Entry> yVals;

@Override
    public void onClick (View view){

        switch (view.getId()) {

             case R.id.moodLogQuarterly:
                retroFitQuarterly();
                break;

            case R.id.moodLogYearly:
                retroFitYearly();
                break;



 public void retroFitYearly() {

    // Retrofit call to the MYSQL server.
    Call<List<MoodLogLineGraph>> call = RetrofitClient.getInstance().getApi().moodLogLineGraphYearly(userId);
    call.enqueue(new Callback<List<MoodLogLineGraph>>() {
        @Override
        public void onResponse(Call<List<MoodLogLineGraph>> call, Response<List<MoodLogLineGraph>> response) {

            getLineGraphWithResponse(response);
 }


public void retroFitQuarterly() {

    // Retrofit call to the MYSQL server.
    Call<List<MoodLogLineGraph>> call = RetrofitClient.getInstance().getApi().moodLogLineGraphQuarterly(userId);
    call.enqueue(new Callback<List<MoodLogLineGraph>>() {
        @Override
        public void onResponse(Call<List<MoodLogLineGraph>> call, Response<List<MoodLogLineGraph>> response) {

            getLineGraphWithResponse(response);
        }


 private void getLineGraphWithResponse(Response<List<MoodLogLineGraph>> response) {

    // All JSON entries form the MYSQL server are parsed into an ArrayList.
       yVals = new ArrayList<>();

    // For loop which dynamically adds all entries to the ArrayList
    // response.body() contains the JSON parsed from the database. The JSON
    // contains all the information requested from the database such as moodId,
    // moodName, posted(date) etc.
    // Getters are used to select specific pieces of information form the JSON array.
    for (MoodLogLineGraph moodLogList : response.body()) {

        // The getter .getMoodBefore contains an int between 1-11. These ints represent
        // the mood the user has inputted to the database i.e 1=happy, 11= Depressed etc.
        // The float val is used to store the integer so it can used in a LineGraph.
        val = (float) moodLogList.getMoodBefore();

        }

        // Obtains the date the mood was recorded from the MYSQL database.
        date = (float) moodLogList.getDay();

        // Adds the values and dates to the LineGraph ArrayList.
        yVals.add(new Entry(date, val));

        // Works out the percentage of positive moods
        percentage = total / response.body().size();
        moodLogPercentage.setText(Math.round(percentage * 100) + "%" + " of your moods are positive");


        //Initialising the LineChart variables which control the presentation.
        LineDataSet set1 = new LineDataSet(yVals, "Data set1");
        set1.setColor(Color.WHITE);
        set1.setLineWidth(2f);
        set1.setDrawValues(false);
        set1.setDrawCircles(false);
        set1.setMode(LineDataSet.Mode.CUBIC_BEZIER);
        set1.setCubicIntensity(0.1f);

        ArrayList<ILineDataSet> dataSet = new ArrayList<>();
        dataSet.add(set1);
        LineData data = new LineData(dataSet);

***其余的代码只是用于设置折线图样式的变量。