检查时CheckBox检查状态

Question

我有这个代码，当checkBox被选中时，editTexts会得到时间（当时间改变时刷新）但是当我取消选中它时，它会将editText设置为空白，它似乎不适用于我打算做的事情

 check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(check.isChecked()){
                final Handler someHandler = new Handler(getMainLooper());
                someHandler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        editTimeOut.setText(new SimpleDateFormat("HH:mm", Locale.US).format(new Date()));
                        someHandler.postDelayed(this, 1000);
                    }
                }, 10);
            }
            else{
                editTimeOut.setText("");
            }
        }
    });

Answer 1

您每秒都在更新edittext而不是取消它。一个简单的解决方法是检查runnable中是否有isChecked。需要进行一些重构的更好的解决方案是删除runnable。

简单修复：

        if(check.isChecked()){
            final Handler someHandler = new Handler(getMainLooper());
            someHandler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    if(check.isChecked()){
                        editTimeOut.setText(new SimpleDateFormat("HH:mm", Locale.US).format(new Date()));
                        someHandler.postDelayed(this, 1000);
                    }
                }
            }, 10);
        }

更好的解决方法：

final Handler someHandler = new Handler(getMainLooper());
Runnable timeoutRunnable = new Runnable() {
                @Override
                public void run() {
                    editTimeOut.setText(new SimpleDateFormat("HH:mm", Locale.US).format(new Date()));
                    someHandler.postDelayed(this, 1000);
                }
            };

check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if(check.isChecked()){
            someHandler.postDelayed(timeoutRunnable, 10);
        } else{
            someHandler.removeCallbacks(timeoutRunnable);
            editTimeOut.setText("");
        }
    }