升级到编译SDK版本后，findViewById错误 [英] Error on findViewById after upgrading to compile sdk version

问题描述

升级到编译SDK版本26后，所有findViewById均显示错误:

After upgrading to compile SDK version 26, all findViewById showing error:

没有足够的信息来有趣地推断参数T findViewById(id:Int):T！

not enough information to infer parameter T in fun findViewById(id: Int): T!

推荐答案

这是因为从Android O开始，我们不需要强制转换.有一些选择.替换:

This is because as of Android O, we don't need to cast it. There are a few options. Replace:

val textInput = findViewById(R.id.edit_text) as TextInputLayout

使用以下任一方法:

val textInput:TextInputLayout = findViewById(R.id.edit_text)

或者:

val textInput = findViewById<TextInputLayout>(R.id.edit_text)

如果您想知道幕后发生的事情，那么从O开始，底层方法已更改为

If you want to know what happened under the covers, as of O underlying method changed to

public <T extends View> T findViewById(@IdRes int id) {
    return this.getDelegate().findViewById(id);
}

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