android - 实现 GoogleApiClient 时遇到问题

Question

我正在尝试在我正在创建的应用程序上使用 Google SignIn。我一直在使用 Google 的开发人员教程，但我收到错误消息“类‘HomeActivity’必须声明为抽象或在‘ConnectionCallbacks’中实现抽象方法‘onConnected(Bundle)’，突出显示如下:

public class HomeActivity extends Activity implements
        ConnectionCallbacks,
        OnConnectionFailedListener,
        OnClickListener

这是我的 HomeActivity 代码，其中大部分是我从 Google 使用的:

import android.app.Activity;
import android.content.IntentSender;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;


import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.Scopes;
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.Scope;
import com.google.android.gms.plus.Plus;
import static android.view.View.*;


public class HomeActivity extends Activity implements
        ConnectionCallbacks,
        OnConnectionFailedListener,
        OnClickListener {

    private static final int RC_SIGN_IN = 0;
    private GoogleApiClient mGoogleApiClient;
    private Button mLoginButton;
    private TextView mSignUpLabel;

    /* Is there a ConnectionResult resolution in progress? */
    private boolean mIsResolving = false;

    /* Should we automatically resolve ConnectionResults when possible? */
    private boolean mShouldResolve = false;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        mLoginButton = (Button) findViewById(R.id.btnLogin);
        mLoginButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(HomeActivity.this, "Button Pressed", Toast.LENGTH_SHORT).show();
            }
        });

        mSignUpLabel = (TextView) findViewById(R.id.lblAboutUs);
        mSignUpLabel.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(HomeActivity.this, "WAY TO SIGN UP MAN", Toast.LENGTH_SHORT).show();
            }
        });

        findViewById(R.id.sign_in_button).setOnClickListener(this);

        // Build GoogleApiClient with access to basic profile
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(Plus.API)
                .addScope(new Scope(Scopes.PROFILE))
                .build();
    }

    @Override
    public void onConnectionSuspended(int arg0) {

        // what should i do here ? should i call mGoogleApiClient.connect() again ? ?

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_home, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        // Could not connect to Google Play Services.  The user needs to select an account,
        // grant permissions or resolve an error in order to sign in. Refer to the javadoc for
        // ConnectionResult to see possible error codes.
        Log.d(TAG, "onConnectionFailed:" + connectionResult);

        if (!mIsResolving && mShouldResolve) {
            if (connectionResult.hasResolution()) {
                try {
                    connectionResult.startResolutionForResult(this, RC_SIGN_IN);
                    mIsResolving = true;
                } catch (IntentSender.SendIntentException e) {
                    Log.e(TAG, "Could not resolve ConnectionResult.", e);
                    mIsResolving = false;
                    mGoogleApiClient.connect();
                }
            } else {
                // Could not resolve the connection result, show the user an
                // error dialog.
                showErrorDialog(connectionResult);
            }
        } else {
            // Show the signed-out UI
            showSignedOutUI();
        }
    }

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

    @Override
    protected void onStop() {
        super.onStop();
        mGoogleApiClient.disconnect();
    }
}

任何帮助将不胜感激!!!

Answer 1

您的类声明它将实现 ConnectionCallbacks，这意味着您必须定义该接口(interface)(以及您希望实现的所有其他接口(interface))中包含的所有方法。两者都是

Android Studio(点击左端的灯泡)和 Eclipse 必须能够自动实现未实现的方法(当然你必须用任何自定义代码填充它们)