Android - 从一个 textView 获取文本并使用 Android 数据绑定(bind)设置到另一个

Question

如何将文本从一个 textView 设置到另一个？如果我这样尝试:

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="SomeText" />

        <TextView
            android:id="@+id/textView2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{textView1.getText()}" />

我收到错误:

            Found data binding errors.
        ****/ data binding error ****msg:Identifiers must have user defined types from the XML file. textView1 is missing it
        loc:51:32 - 51:41
        ****\ data binding error ****

我尝试了很多选择，但都没有成功。在此先感谢您的帮助!

Answer 1

对我来说这很好用

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

        <TextView
                android:id="@+id/textView1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="something" />

        <TextView
                android:id="@+id/textView2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@{textView1.text}" />

    </LinearLayout>
</layout>


class SimpleFragment : Fragment() {

    companion object {
        fun newInstance() = SimpleFragment()
    }

    private lateinit var binding: SimpleFragmentBinding

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        String
        binding = SimpleFragmentBinding.inflate(inflater)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        textView1.text = "something else"
    }
}