Android错误:addConnectionCallbacks不适用于参数

Question

请看我的MainActivity.java并告诉我为什么我得到以下错误

The method addConnectionCallbacks(GoogleApiClient.ConnectionCallbacks) in the type GoogleApiClient.Builder is not applicable for the arguments (MainActivity)

package com.example.myapp;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks; 
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

public class MainActivity extends Activity {

    private GoogleApiClient mGoogleApiClient ;   

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        buildGoogleApiClient();

        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
        .addConnectionCallbacks(this)
        .addOnConnectionFailedListener(this)
        .addApi(LocationServices.API)
        .build();
    }
}

请告诉我为什么会这样.我是否必须添加任何导入？我从developer.android.com获得了这段代码

Answer 1

您MainActivity需要实现接口ConnectionCallbacks和OnConnectionFailedListener.之后,您需要添加方法onConnected,onConnectionSuspended并onConnectionFailed:

public class MainActivity extends Activity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    private GoogleApiClient mGoogleApiClient ;   

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        buildGoogleApiClient();

        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
        .addConnectionCallbacks(this)
        .addOnConnectionFailedListener(this)
        .addApi(LocationServices.API)
        .build();
    }

    @Override
    public void onConnected(Bundle bundle) {

    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }
}