如何在textView中显示字符串的子字符串 [英] how to display substring of a string in textView

问题描述

我正在尝试获取要从editText显示到textView的字符串的子字符串.我使用addTextChangedListener到edittext来执行此操作

在这种方法中，我尝试从edittext获取一个子字符串，以在运行该应用程序时显示在textView中.

i am trying to get a substring of a string to be displayed from an editText to a textView. i used addTextChangedListener to the edittext to perform this operation

in this method i am trying to get a substring from the edittext to be shown in the textView on running the app nothing happens.

public void afterTextChanged(Editable s) {
			// TODO Auto-generated method stub
			TextView gtin = (TextView) findViewById(R.id.textView2);
			String sgtin=gtin.getText().toString();
			sgtin.substring(0,7);
			   gtin.setText(sgtin);
		}

我在哪里可能出了错.需要指导

where have i possible gone wrong. need guidence

推荐答案

Java的substring()返回一个字符串: ^ ]
所以你应该:

Java''s substring() returns a string : http://www.tutorialspoint.com/java/java_string_substring.htm[^]
so you should :

String str = sgtin.substring(0,7);
gtin.setText(str);

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