输入活动后，微调器项目将自动被选择.如何避免这种情况? [英] Spinner item gets automatically selected upon entering activity. How do I avoid this?

问题描述

我的Android应用中有一个微调器，并且进入活动后会自动触发其onItemSelected()事件.

I have a spinner in my Android app, and its onItemSelected() event automatically gets triggered upon entering the activity.

如何避免这种情况?

推荐答案

我们可以使用一个标志，并在真正触摸到微调框时启用它.

We can use a flag, and just enable it when the spinner is really touched.

private boolean isSpinnerTouched = false; 

spinner.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                isSpinnerTouched = true;
                return false;
            }
        });
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> adapter, View arg1,
                        int arg2, long arg3) {
                    if (!isSpinnerTouched) return;
                    // do what you want 
                    }
        });

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