Android的ListView控件onClickListener自定义适配器 [英] Android ListView onClickListener Custom Adapter

问题描述

我也读到了自定义适配器，以及如何对其进行索引帖，但似乎我不能让我的工作。我覆盖getView和我的XML包含TextView的1和2按钮。我做了，通过的onClickListener检测两个按钮但是我不能区分其中的ListView元素是谁引发了ClickEvent之一。我想我不同的方法，但我总是在onclick方法一个NullPointerException异常。

  @覆盖
公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
    ViewHolder持有人;
    如果（convertView == NULL）{
        LayoutInflater吹气=（LayoutInflater）context.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
        convertView = inflater.inflate（R.layout.listexample，NULL）;
        持有人=新ViewHolder（）;
        holder.textView =（TextView中）convertView.findViewById（R.id.commandLine_text）;
        holder.start =（按钮）convertView.findViewById（R.id.test_start_button）;
        holder.stop =（按钮）convertView.findViewById（R.id.test_stop_button）;
        convertView.setTag（保持器）;
        convertView.findViewById（R.id.commandLine_text）;
        convertView.findViewById（R.id.test_start_button）;
        convertView.findViewById（R.id.test_stop_button）;    }其他{
        支架=（ViewHolder）convertView.getTag（）;
    }
    holder.textView.setText（this.getItem（位置））;
    holder.start.setOnClickListener（本）;
    holder.stop.setOnClickListener（本）;
    返回convertView;}
@覆盖
公共无效的onClick（视图v）{
 //在这里，我想知道这两个按钮（启动，停止）被点击，什么位置
    INT位置=（整数）v.getTag（）;
    Log.d（onclick事件，位置：+位置）;}
静态类ViewHolder {
    TextView中的TextView;
    按钮启动;
    按钮停止;
}
 

解决方案

尝试使用<一个href=\"https://developer.android.com/reference/android/widget/AdapterView.html#getPositionForView%28android.view.View%29\"相对=nofollow> getPositionForView（V） 找到关联到这是pressed按钮的位置。

I read posts about custom adapters and how to index them but it seems i cannot make mine work. I overwrite the getView and my XML contains 1 TextView and 2 Buttons. I made it that both buttons were detected by the onClickListener however i couldnt differentiate which ListView element was the one who triggered the ClickEvent. I tried i different approach but i always get a NullPointerException in the onClick Method.

    @Override
public View getView(int position, View convertView, ViewGroup parent){
    ViewHolder holder;      
    if(convertView == null){
        LayoutInflater inflater = (LayoutInflater)  context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        convertView = inflater.inflate(R.layout.listexample, null);
        holder = new ViewHolder();
        holder.textView = (TextView) convertView.findViewById(R.id.commandLine_text);
        holder.start = (Button) convertView.findViewById(R.id.test_start_button);
        holder.stop = (Button) convertView.findViewById(R.id.test_stop_button);
        convertView.setTag(holder);
        convertView.findViewById(R.id.commandLine_text);
        convertView.findViewById(R.id.test_start_button);
        convertView.findViewById(R.id.test_stop_button);

    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    holder.textView.setText(this.getItem(position));
    holder.start.setOnClickListener(this);
    holder.stop.setOnClickListener(this);
    return convertView;

}
@Override
public void onClick(View v) {
 //Here i want to know which button of the two (start,stop) was clicked and what position
    int position =(Integer)v.getTag();
    Log.d("OnClick","Position: "+position);

}
static class ViewHolder {
    TextView textView;
    Button start;
    Button stop;
}

解决方案

Try using getPositionForView(v) to find the position that correlates to the button that was pressed.

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