android - 错误 : cannot find symbol: variable Build. VERSION_CODES.O_MR1

Question

我正在尝试实现一个 native 模块，该模块在 React Native 中提供连接服务。但我面临一个错误。由于我不是 android/java 开发人员，因此无法找到以下错误的原因。

E:\projects\deets-mobile-cp\node_modules\react-native-connection-service\android\src\main\java\com\genm\CallConnection.java:10: error: cannot find symbol
    @TargetApi(Build.VERSION_CODES.O_MR1)
                                  ^
      symbol:   variable O_MR1
      location: class VERSION_CODES
    E:\projects\deets-mobile-cp\node_modules\react-native-connection-service\android\src\main\java\com\genm\CallConnection.java:14: error: cannot find symbol
            setConnectionProperties(PROPERTY_SELF_MANAGED);
                                    ^
      symbol:   variable PROPERTY_SELF_MANAGED
      location: class CallConnection

CallConnection.java

package com.genm;

import android.annotation.TargetApi;
import android.os.Build;
import android.telecom.Connection;
import android.util.Log;

import static android.content.ContentValues.TAG;

@TargetApi(Build.VERSION_CODES.O_MR1)
public class CallConnection extends Connection{

    public CallConnection(){
        setConnectionProperties(PROPERTY_SELF_MANAGED);
        setAudioModeIsVoip(true);
    }

    @Override
    public  void onAnswer(){
        Log.d(TAG, "On answer to the call");
    }

}

Answer 1

确保你的 build.gradle 文件中有 compileSdkVersion = 27

compileSdkVersion is the SDK level which will be used to compile your app. If you need to access properties or methods added on API 27 you need to update this value accordingly. This means that if you needed to access (for example) Build.VERSION_CODES.P you should have set compileSdkVersion = 28 and so on...