abdroid关于TextView.getLineCount() 为0

最新推荐文章于 2023-01-10 15:36:20 发布

原创最新推荐文章于 2023-01-10 15:36:20 发布 · 1.3k 阅读

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文章标签：

#null #listview #layout #class #ui

在listview中要获得某个textView的行数：

 if(convertView == null){
            convertView = lInflater.inflate(R.layout.listview, null);
            holder = new ViewHolder();
            holder.text2 = (TextView)convertView.findViewById(R.id.TextView02);
        convertView.setTag(holder);
        }

        else{
            holder = (ViewHolder)convertView.getTag();
        }

        holder.text2.setText(arr2[position]);
        holder.text2.invalidate();
        int lineCnt = holder.text2.getLineCount();

holder.text2.getLineCount();为0

具体原因为：

getLineCount() will give you the correct number of lines only after a layout pass. That means the TextView must have been drawn at least once. I assume that at this point of time your Textview is not drawn hence you are getting 0 as the line count

针对上面的问题我们可以在一个非主线程即非UI线程中来获得lineCount.

可以这样做：

....................
else{
            holder = (ViewHolder)convertView.getTag();
        }

        holder.text2.setText(arr2[position]);
        holder.text2.invalidate();
        
        new myAsyncTask().execute(null, null, null);
..................private class myAsyncTask extends AsyncTask<Void, Void, Void> {    @Override    protected Void doInBackground(final Void... params) {        // It's okay to leave this as it is        return null;    }    @Override    protected void onPostExecute(final Void result) {        super.onPostExecute(result);        //DO YOUR TASK HERE, getLineCount(), etc.

      //在非主线程调用getLinrCount()int lineCnt = holder.text2.getLineCount();

}
}