[英]How do I change TextView Value inside Java Code?
I am working on a android program.我正在开发一个 android 程序。 A user clicks on a button I do some math and I would like to change the values that I have on my view in some TextView objects.
用户单击一个按钮,我做了一些数学运算,我想更改某些 TextView 对象中视图上的值。 Can someone please tell me how to do it in my code?
有人可以告诉我如何在我的代码中做到这一点吗?
I presume that this question is a continuation of this one .我相信,这个问题的延续这一个。
What are you trying to do?你想做什么? Do you really want to dynamically change the text in your TextView objects when the user clicks a button?
当用户单击按钮时,您真的想动态更改 TextView 对象中的文本吗? You can certainly do that, if you have a reason, but, if the text is static, it is usually set in the main.xml file, like this:
你当然可以这样做,如果你有理由,但是,如果文本是静态的,它通常在 main.xml 文件中设置,如下所示:
<TextView
android:id="@+id/rate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/rate"
/>
The string "@string/rate" refers to an entry in your strings.xml file that looks like this:字符串“@string/rate”指的是 strings.xml 文件中的一个条目,如下所示:
<string name="rate">Rate</string>
If you really want to change this text later, you can do so by using Nikolay's example - you'd get a reference to the TextView by utilizing the id defined for it within main.xml, like this:如果您以后真的想更改此文本,可以使用 Nikolay 的示例来进行更改 - 您可以使用 main.xml 中为其定义的 id 来获得对 TextView 的引用,如下所示:
final TextView textViewToChange = (TextView) findViewById(R.id.rate);
textViewToChange.setText(
"The new text that I'd like to display now that the user has pushed a button.");
First we need to find a Button
:首先我们需要找到一个
Button
:
Button mButton = (Button) findViewById(R.id.my_button);
After that, you must implement View.OnClickListener
and there you should find the TextView
and execute the method setText
:之后,您必须实现
View.OnClickListener
并在那里找到TextView
并执行方法setText
:
mButton.setOnClickListener(new View.OnClickListener {
public void onClick(View v) {
final TextView mTextView = (TextView) findViewById(R.id.my_text_view);
mTextView.setText("Some Text");
}
});
First, add a textView in the XML file首先在xml文件中添加一个textView
<TextView
android:id="@+id/rate_id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/what_U_want_to_display_in_first_time"
/>
then add a button in xml file with id btn_change_textView and write this two line of code in onCreate()
method of activity然后在xml文件中添加一个id为btn_change_textView的按钮,并在活动的
onCreate()
方法中写入这两行代码
Button btn= (Button) findViewById(R.id. btn_change_textView);
TextView textView=(TextView)findViewById(R.id.rate_id);
then use clickListener()
on button object like this然后像这样在按钮对象上使用
clickListener()
btn.setOnClickListener(new View.OnClickListener {
public void onClick(View v) {
textView.setText("write here what u want to display after button click in string");
}
});
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