android - 数据绑定(bind)中的调用方法

Question

如何将方法的返回值绑定(bind)到 TextView 中？

示例:

class U {
    final String a = "x", b = "ddd";

    String message(){
        return a + " " + b;
    }
}

所以通过数据绑定(bind)我想显示 message() 的返回值

Answer 1

尝试这样的事情

1 - 在您的 Activity 中:

YourLayoutBinding mBinding; //this type of class is auto-generated by AS based on the name of your layout.xml

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mBinding = DataBindingUtil.setContentView(this, R.layout.your_layout);
    mBinding.setU(new U());
}

2 - 在您的布局中:

<data>
    <variable name="u" type="U" />
</data>

<TextView
      android:layout_width="match_parent"
      android:layout_height="match_parent"                         
      android:text="@{u.message}"
      android:textColor="#000"/>