Google Drive Android API 未运行

Question

我已经安装了所有必要的 sdks 和 GoogleAPI、Google Play 服务等，但我仍然收到错误消息！请注意，我仍处于制作应用程序的初始步骤，因此缺少代码，这是我的代码：

package com.example.googleapi;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentSender;
import android.content.IntentSender.SendIntentException;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.drive.Drive;
import com.google.android.gms.drive.DriveApi.DriveContentsResult;
import com.google.android.gms.drive.MetadataChangeSet;



public class MainActivity extends ActionBarActivity {

    GoogleApiClient mGoogleApiClient;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(Drive.API)
                .addScope(Drive.SCOPE_FILE)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();
    }

    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

}

这是我得到的编译错误：

Error:(38, 17) error: method addConnectionCallbacks in class Builder cannot be applied to given types;
required: ConnectionCallbacks
found: MainActivity
reason: actual argument MainActivity cannot be converted to ConnectionCallbacks by method invocation conversion

Answer 1

您的MainActivity 类需要实现以下两个接口：GoogleApiClient.ConnectionCallbacks、GoogleApiClient.OnConnectionFailedListener。此外，您的类现在需要实现/覆盖这些类中的几个方法。因此，您的 MainActivity 类应该类似于以下内容：

public class MainActivity extends ActionBarActivity
        implements GoogleApiClient.ConnectionCallbacks
        ,GoogleApiClient.OnConnectionFailedListener

对于 GoogleApiClient，请访问此链接：https://developers.google.com/android/reference/com/google/android/gms/common/api/GoogleApiClient