如何在 switch 语句上实现验证？

Question

简单的switch 语句，带有下一步按钮作为最后一个案例。我想要它，所以用户必须在 switch 语句中选择一个图像，然后再继续。我不知道如何编写一些东西来阻止他们用户只需单击下一个按钮并移动到下一个活动而不从 switch 语句中进行选择。代码如下。

    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

您可以从 switch 语句之外启动活动 随便写

按钮按钮下一步。 = findViewById..

buttonNext.SetOnClickListener...

Answer 2

您需要禁用nextBtnMoodPage 执行的操作，直到用户选择了任何其他选项。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，一旦用户选择了一个选项，您需要做的就是翻转一个标志。如果该标志未翻转，则使下一个按钮的操作不执行任何操作。

如果按钮不执行任何操作，将按钮设为灰色或以其他方式将其显示为禁用也是一个好主意，但我不会解释如何执行此操作，因为它超出了此问题的范围。

祝你好运！