在类的代码中设置drawableLeft. [英] Set drawableLeft in code in a class.

问题描述

你好，我的好朋友，

当我尝试像这样在我的android应用程序中设置drawableLeft时:

Hello my good friends,

When I try to set a drawableLeft in my android application like this:

TextView textView = new TextView() findViewById(R.id.mainList);
textView.setCompoundDrawablesWithIntrinsicBounds(R.drawable.mul, 0, 0, 0);

第一行出现错误:

构造函数TextView()未定义."
和
对于类型Item，未定义方法findViewById(int)."

我该如何解决?我正在上课.

谢谢！

保持甜蜜！

更新:

基本上，我的问题是:如何从不同的类(例如，在我的主活动中)访问TextView并设置drawableLeft(或例如文本)?

I get a error with the first line:

"The constructer TextView() is undefined."
and
"The method findViewById(int) is undefined for the type Item."

How can I solve this? I am working in a class.

Thanks!

Stay sweet!

Update:

Basicly my question is: How can I access a TextView and set a drawableLeft (or for example text) in for example my Main Activity from a diffrent class?

推荐答案

文档:

TextView.setCompoundDrawablesWithIntrinsicBounds(int，int，int，int) [ ] @ developer.android.com/reference/android [

The doc:

TextView.setCompoundDrawablesWithIntrinsicBounds(int, int, int, int)[] @ developer.android.com/reference/android[^]

so your call of the method seems to be fine. Have you set a number value for the call R.drawable.mul ? That one might not be there when you request it.

You can also use a variable first and set that one into your code to check the value while debugging:

TextView textView = new TextView() findViewById(R.id.mainList);
int iLeft = R.drawable.mul;
textView.setCompoundDrawablesWithIntrinsicBounds(iLeft, 0, 0, 0);

其他想法:何时将视图添加到应用程序?当您尝试绘制边界时它已经存在吗?您应该以图形方式更新视图吗?

Other idea: When is the view added to the app? is it already existing when you''re trying to draw the bound? should you update the view (graphically)?

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