Question

简单的switch语句，最后一个按钮为下一个按钮。我想要它，因此用户必须在继续之前在switch语句中选择一个图像。我不知道如何写一些东西来阻止他们，用户只需单击next按钮并转到下一个活动，而无需从switch语句中进行选择。下面的代码。

    public void onClick(View v) {

    SharedPreferences.Editor editorWorkout = workoutPref.edit();

    // get the constraint layout from its ID.
    ConstraintLayout mConstraintLayout = getView().findViewById(R.id.FragmentWorkoutMood1);

    switch (v.getId()) {
        case R.id.excitedFace:
            mConstraintLayout.setBackgroundResource(R.mipmap.background_clouds_excited);
            editorWorkout.putInt("excitedkey", EXCITED.getId());
            editorWorkout.commit();
            break;
        case R.id.happyFace:
            mConstraintLayout.setBackgroundResource(R.mipmap.background_clouds_happy);
            editorWorkout.putInt("happykey", HAPPY.getId());
            editorWorkout.commit();
            break;
        case R.id.fineFace:
                 mConstraintLayout.setBackgroundResource(R.mipmap.background_clouds_fine);
            editorWorkout.putInt("finekey", FINE.getId());
            editorWorkout.commit();
            break;
        case R.id.nextBtnMoodPage:
            Intent intent = new Intent(getActivity(),   WorkoutAutomaticThoughtActivity.class);
            startActivity(intent);
    }

Answer 1

您需要禁用nextBtnMoodPage所执行的操作，直到用户选择了其他任何选项。使用简单的布尔值执行此操作。见下文：

// Inside the class itself
private boolean hasSelected = false;

public void onClick(View v) {

    SharedPreferences.Editor editorWorkout = workoutPref.edit();

    // get the constraint layout from its ID.
    ConstraintLayout mConstraintLayout = getView().findViewById(R.id.FragmentWorkoutMood1);

    switch (v.getId()) {
        case R.id.excitedFace:
            mConstraintLayout.setBackgroundResource(R.mipmap.background_clouds_excited);
            editorWorkout.putInt("excitedkey", EXCITED.getId());
            editorWorkout.commit();
            hasSelected = true;
            break;
        case R.id.happyFace:
            mConstraintLayout.setBackgroundResource(R.mipmap.background_clouds_happy);
            editorWorkout.putInt("happykey", HAPPY.getId());
            editorWorkout.commit();
            hasSelected = true;
            break;
        case R.id.fineFace:
            mConstraintLayout.setBackgroundResource(R.mipmap.background_clouds_fine);
            editorWorkout.putInt("finekey", FINE.getId());
            editorWorkout.commit();
            hasSelected = true;
            break;
        case R.id.nextBtnMoodPage:
            if(hasSelected){
                Intent intent = new Intent(getActivity(),   WorkoutAutomaticThoughtActivity.class);
                startActivity(intent);
            }
    }
}

简而言之，只要用户选择了一个选项，您要做的就是翻转一个标志。如果该标记未翻转，请对下一个按钮进行操作，不执行任何操作。

如果该按钮不执行任何操作，则将其变灰或将其显示为禁用也是一个好主意，但是由于此问题不在我的范围内，因此我将不解释如何执行该操作。

祝你好运！

Answer 2

您可以从switch语句外部开始活动只是写

按钮按钮下一步。 = findViewById ..

buttonNext.SetOnClickListener ...

如何在switch语句上实现验证？

2 个答案: