最后一个简单的switch语句带有下一个按钮。我想要它,因此用户必须先在switch语句中选择一个图像,然后再继续。我不知道如何写一些东西来阻止他们,用户只需单击下一个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);
    }

最佳答案

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,您需要做的就是一旦用户选择了一个选项,就翻转一个标志。如果该标志未翻转,则使下一个按钮的操作无效。

如果不执行任何操作,则将按钮变灰或将其显示为禁用也是一个好主意,但是由于该问题超出了我的范围,因此我不会解释如何执行此操作。

祝好运!

关于java - 如何在switch语句上实现验证?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/56245987/

10-12 01:50