安卓的EditText和addTextChangedListener [英] Android EditText and addTextChangedListener

问题描述

即时通讯目前正在移植一个数据库管理器Android和由于性能原因，我喜欢 仅更新已修改propertys。我试着去做到这一点的addTextChangedListener以修改entrys添加到列表，但我的计划从来没有进入它的任何方法。

 的EditText的Et =（EditText上）Editors.get（Prop.Name）;
Et.addTextChangedListener（新TextWatcher（）{
    @覆盖
    公共无效afterTextChanged（编辑S）{
        // TODO自动生成方法存根
    }

    @覆盖
    公共无效beforeTextChanged（CharSequence中，诠释开始，诠释计数，之后INT）{
        // TODO自动生成方法存根
    }

    @覆盖
    公共无效onTextChanged（CharSequence中，诠释开始，诠释之前，诠释计数）{
        // TODO自动生成方法存根
        如果（Prop.GetType（）== Property.PROPTYPE.num）{
            浮F = Float.parseFloat（s.toString（））;
            Prop.FromString（F）;
        }
        其他 {
            Prop.FromString（s.toString（））;
        }
        propertiesToUpdate.add（道具）;
}）;
Et.setText（Prop.ToString（））;
 

解决方案

为什么得到的EditText实例这种方式。这是你的活动布局的一部分，所以你应该得到它像这样

 的EditText的Et =（EditText上）findViewById（R.id.your_id）;
 

我认为这个问题是你拿的引用EditText上不属于你的活动布局，要连接监听到错误的观点。

im currently porting a database manager to android and due to performance reasons i like to update only propertys that have been modified. Im trying to do this with the addTextChangedListener in order to add modified entrys to a List, but my Program never enters any of its methods.

EditText Et = (EditText) Editors.get(Prop.Name);
Et.addTextChangedListener(new TextWatcher() {
    @Override
    public void afterTextChanged(Editable s) {
        // TODO Auto-generated method stub
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // TODO Auto-generated method stub
        if(Prop.GetType() == Property.PROPTYPE.num) {
            float f = Float.parseFloat(s.toString());
            Prop.FromString(f);
        }
        else {
            Prop.FromString(s.toString());
        }
        propertiesToUpdate.add(Prop);
});
Et.setText(Prop.ToString());

解决方案

Why are getting the EditText instance this way. It's part of your activity layout so you should get it something like this

EditText Et = (EditText) findViewById(R.id.your_id);

I think the problem is that you're holding a reference to a EditText which don't belong to your Activity layout so you are attaching the listener to the wrong view.

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