错误:onActivityResult不会覆盖任何内容

Question

我正在为Kotlin for Android编写一个语音识别应用程序.

class MainActivity : AppCompatActivity() {
    public override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val intent:Intent = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH)
            intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM)
        startActivityForResult(intent, REQUEST_CODE)

    }

    override fun onActivityResult(requestCode:Int, resultCode:Int, data:Intent) {
        if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {/*do something*/  }
        super.onActivityResult(requestCode, resultCode, data)
    }
}

严格来说,编译器总是会发现错误:'onActivityResult'不会覆盖任何内容.

可以使用onActivityResult恢复使用startActivityForResult结果的Android状态文档.

现在的问题是:如何使用Kotlin获得语音识别的结果？

Answer 1

更换

override fun onActivityResult(requestCode:Int, resultCode:Int, data:Intent)

使用下面的代码,使Intent对象可以为空.

override fun onActivityResult(requestCode:Int, resultCode:Int, data:Intent?)

由于Intent在父Activity类中声明为可为空.以下是示例代码:

protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data)