我的班级不是封闭班级答案

【问题标题】：My Class in not an enclossing class我的班级不是封闭班级
【发布时间】：2018-05-20 03:23:20
【问题描述】：

所以我有类构造函数：

public class HealthDataStore { // this class is 3rd party api - can't modify
    public HealthDataStore(Context context, HealthDataStore.ConnectionListener listener){ /* bla... */ }

    /* bla... */

    // with Listener Interface:
    public interface ConnectionListener {
        void onConnected();
        void onConnectionFailed(HealthConnectionErrorResult var1);
        void onDisconnected();
    }
}

在我的存储库类中，我有：

public class HealthRepository {
    private string DSConnectionStatus;

    public void connectDataStore(HealthDSConnectionListener listener) {
        mStore = new HealthDataStore(app, listener);
        mStore.connectService();
    }

    // with inner class:
    public class HealthDSConnectionListener implements HealthDataStore.ConnectionListener{
        @Override public void onConnected() { DSConnectionStatus = "Connected"; }

        @Override public void onConnectionFailed(HealthConnectionErrorResult healthConnectionErrorResult) { DSConnectionStatus = "Connection Failed"; }

        @Override public void onDisconnected() { DSConnectionStatus = "Disconnected"; }
    };
}

在我的视图模型类中，我有以下对象：

public class SplashViewModel extends AndroidViewModel {

    public void connectRepoDataStore(){
        // repo is object of class HealthRepository
        repo.connectDataStore(mConnectionListener)
        // other things to do here 
    }

    private final HealthRepository.HealthDSConnectionListener mConnectionListener = new HealthRepository.HealthDSConnectionListener(){
        @Override public void onConnected() {
            super.onConnected(); // i need this super to set DSConnectionStatus value
            // other things to do here 
        }

        @Override public void onConnectionFailed(HealthConnectionErrorResult error) {
            super.onConnectionFailed(error); // i need this super to set DSConnectionStatus value
            // other things to do here 
        }

        @Override public void onDisconnected() {
            super.onDisconnected(); // i need this super to set DSConnectionStatus value
            // other things to do here 
        }
    }

为什么private final HealthRepository.HealthDSConnectionListener mConnectionListener = new HealthRepository.HealthDSConnectionListener() 向我抛出该类未包含类的错误？

那我应该如何实现呢？让我的最终侦听器类能够在 healthrepository 类中设置 DSConnectionStatus？

【问题讨论】：

标签： android

【解决方案1】：

如果您知道必须扩展内部类，请始终尽量避免使用它们。而是使用单独的类，并将外部类与字段交换。如果您需要修改不想公开的私有字段，请创建一个包私有设置器。

public class HealthRepository {
    private String DSConnectionStatus;

    public void connectDataStore(HealthDSConnectionListener listener) {
        mStore = new HealthDataStore(app, listener);
        mStore.connectService();
    }

    void setConnectionStatus(String status) {
        DSConnectionStatus = status;
    }
}

// create another class in the same package
public class HealthDSConnectionListener implements HealthDataStore.ConnectionListener {
    private final HealthRepository repo;

    public HealthDSConnectionListener(HealthRepository repo) {
        this.repo = repo;
    }

    @Override public void onConnected() { repo.setConnectionStatus("Connected"); }
    @Override public void onDisconnected() { repo.setConnectionStatus("Disconnected"); }

    @Override public void onConnectionFailed(HealthConnectionErrorResult error) {
        repo.setConnectionStatus("Connection Failed"); 
    }
};

public class SplashViewModel extends AndroidViewModel {
    private final HealthRepository repo;

    public void connectRepoDataStore() {
        // repo is object of class HealthRepository
        repo.connectDataStore(mConnectionListener)
        // other things to do here 
    }

    private final HealthDSConnectionListener mConnectionListener = new HealthDSConnectionListener(repo) {
        @Override public void onConnected() {
            super.onConnected();
            // ...
        }

        @Override public void onConnectionFailed(HealthConnectionErrorResult error) {
            super.onConnectionFailed(error);
            // ...
        }

        @Override public void onDisconnected() {
            super.onDisconnected(); 
            // ...
        }
    }
}

【讨论】：