Android 模拟器：如果没有 Google Play 服务，此应用将无法运行

Android Emulator: This app won't run without Google Play services

提问by Kevin Cruijssen

Since Android 4.2.2 it's possible to run Google Services on the Android Emulator. I'm currently making an Android app and made a test project to see if I can get Google+ sign-in and sign-out to work.

从 Android 4.2.2 开始，可以在 Android 模拟器上运行 Google 服务。我目前正在制作一个 Android 应用程序并制作了一个测试项目，看看我是否可以让 Google+ 登录和注销工作。

I've followed the following tutorial: http://www.androidhive.info/2014/02/android-login-with-google-plus-account-1/

我遵循了以下教程：http: //www.androidhive.info/2014/02/android-login-with-google-plus-account-1/

With extra info used from the following tutorials/sites:

使用来自以下教程/站点的额外信息：

• https://developers.google.com/+/mobile/android/getting-started
• https://developers.google.com/+/mobile/android/sign-in
• http://developer.android.com/google/play-services/setup.html#Setup

• https://developers.google.com/+/mobile/android/getting-started
• https://developers.google.com/+/mobile/android/sign-in
• http://developer.android.com/google/play-services/setup.html#Setup

This generated the following code:

这生成了以下代码：

AndroidManifest.xml:

AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testproject_gmaillogin"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="9"
        android:targetSdkVersion="19" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <uses-permission android:name="android.permission.USE_CREDENTIALS" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />

        <activity
            android:name="com.example.testproject_gmaillogin.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

strings.xml:

字符串.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">TestProject_GmailLogin</string>
    <string name="action_settings">Settings</string>

    <string name="profile_pic_description">Google Profile Picture</string>
    <string name="btn_logout_from_google">Logout from Google</string>
    <string name="btn_revoke_access">Revoke Access</string>

</resources>

activity_main.xml:

活动_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context=".MainActivity" >

    <LinearLayout
        android:id="@+id/profile_layout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:orientation="horizontal"
        android:weightSum="3"
        android:visibility="gone">

        <ImageView
            android:id="@+id/img_profile_pic"
            android:contentDescription="@string/profile_pic_description"
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"/>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:orientation="vertical"
            android:layout_weight="2" >

            <TextView
                android:id="@+id/txt_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="5dp"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/txt_email"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="5dp"
                android:textSize="18sp" />
        </LinearLayout>
    </LinearLayout>

    <com.google.android.gms.common.SignInButton
        android:id="@+id/btn_sign_in"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"/>

    <Button
        android:id="@+id/btn_sign_out"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/btn_logout_from_google"
        android:visibility="gone"
        android:layout_marginBottom="10dp"/>

    <Button
        android:id="@+id/btn_revoke_access"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/btn_revoke_access"
        android:visibility="gone" />

</LinearLayout>

MainActivity.java:

主活动.java：

package com.example.testproject_gmaillogin;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.SignInButton;
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.common.api.Status;
import com.google.android.gms.plus.Plus;
import com.google.android.gms.plus.model.people.Person;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.content.IntentSender.SendIntentException;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements ConnectionCallbacks, OnConnectionFailedListener, OnClickListener
{
    // Logcat tag
    private static final String TAG = "MainActivity";

    // Profile pix image size in pixels
    private static final int PROFILE_PIC_SIZE = 400;

    // Request code used to invoke sign in user interactions
    private static final int RC_SIGN_IN = 0;

    // Client used to interact with Google APIs
    private GoogleApiClient mGoogleApiClient;

    // A flag indicating that a PendingIntent is in progress and prevents
    // us from starting further intents
    private boolean mIntentInProgress;

    // Track whether the sign-in button has been clicked so that we know to resolve
    // all issues preventing sign-in without waiting
    private boolean mSignInClicked;

    // Store the connection result from onConnectionFailed callbacks so that we can
    // resolve them when the user clicks sign-in
    private ConnectionResult mConnectionResult;

    // The used UI-elements
    private SignInButton btnSignIn;
    private Button btnSignOut, btnRevokeAccess;
    private ImageView imgProfilePic;
    private TextView txtName, txtEmail;
    private LinearLayout profileLayout;

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

        // Get the UI-elements
        btnSignIn = (SignInButton) findViewById(R.id.btn_sign_in);
        btnSignOut = (Button) findViewById(R.id.btn_sign_out);
        btnRevokeAccess = (Button) findViewById(R.id.btn_revoke_access);
        imgProfilePic = (ImageView) findViewById(R.id.img_profile_pic);
        txtName = (TextView) findViewById(R.id.txt_name);
        txtEmail = (TextView) findViewById(R.id.txt_email);
        profileLayout = (LinearLayout) findViewById(R.id.profile_layout);

        // Set the Button onClick-listeners
        btnSignIn.setOnClickListener(this);
        btnSignOut.setOnClickListener(this);
        btnRevokeAccess.setOnClickListener(this);

        mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(Plus.API, null)
            .addScope(Plus.SCOPE_PLUS_LOGIN)
            .build();
    }

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

    @Override
    protected void onStop(){
        super.onStop();

        if(mGoogleApiClient.isConnected())
            mGoogleApiClient.disconnect();
    }

    @Override
    public void onClick(View view){
        switch(view.getId()){
            case R.id.btn_sign_in:
                signInWithGPlus();
                break;
            case R.id.btn_sign_out:
                signOutFromGPlus();
                break;
            case R.id.btn_revoke_access:
                revokeGPlusAccess();
                break;
        }
    }

    @Override
    public void onConnectionFailed(ConnectionResult result) {
        if(!result.hasResolution()){
            GooglePlayServicesUtil.getErrorDialog(result.getErrorCode(), this, 0).show();
            return;
        }

        if(!mIntentInProgress){
            // Store the ConnectionResult so that we can use it later when the user clicks 'sign-in'
            mConnectionResult = result;

            if(mSignInClicked)
                // The user has already clicked 'sign-in' so we attempt to resolve all
                // errors until the user is signed in, or they cancel
                resolveSignInErrors();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int responseCode, Intent intent){
        if(requestCode == RC_SIGN_IN && responseCode == RESULT_OK)
            SignInClicked = true;

            mIntentInProgress = false;

            if(!mGoogleApiClient.isConnecting())
                mGoogleApiClient.connect();
        }
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        mSignInClicked = false;
        Toast.makeText(this, "User is connected!", Toast.LENGTH_LONG).show();

        // Get all the user's information
        getProfileInformation();

        // Update the UI after sign-in
        updateUI(true);
    }

    @Override
    public void onConnectionSuspended(int cause){
        mGoogleApiClient.connect();
        updateUI(false);
    }

    // Updating the UI, showing/hiding buttons and profile layout
    private void updateUI(boolean isSignedIn){
        if(isSignedIn){
            btnSignIn.setVisibility(View.GONE);
            btnSignOut.setVisibility(View.VISIBLE);
            btnRevokeAccess.setVisibility(View.VISIBLE);
            profileLayout.setVisibility(View.VISIBLE);
        }
        else{
            btnSignIn.setVisibility(View.VISIBLE);
            btnSignOut.setVisibility(View.GONE);
            btnRevokeAccess.setVisibility(View.GONE);
            profileLayout.setVisibility(View.GONE);
        }
    }

    // Sign-in into Google
    private void signInWithGPlus(){
        if(!mGoogleApiClient.isConnecting()){
            mSignInClicked = true;
            resolveSignInErrors();
        }
    }

    // Method to resolve any sign-in errors
    private void resolveSignInErrors(){
        if(mConnectionResult.hasResolution()){
            try{
                mIntentInProgress = true;

                //Toast.makeText(this, "Resolving Sign-in Errors", Toast.LENGTH_SHORT).show();

                mConnectionResult.startResolutionForResult(this, RC_SIGN_IN);
            }
            catch(SendIntentException e){
                // The intent was cancelled before it was sent. Return to the default
                // state and attempt to connect to get an updated ConnectionResult
                mIntentInProgress = false;
                mGoogleApiClient.connect();
            }
        }
    }

    // Fetching the user's infromation name, email, profile pic
    private void getProfileInformation(){
        try{
            if(Plus.PeopleApi.getCurrentPerson(mGoogleApiClient) != null){
                Person currentPerson = Plus.PeopleApi.getCurrentPerson(mGoogleApiClient);
                String personName = currentPerson.getDisplayName();
                String personPhotoUrl = currentPerson.getImage().getUrl();
                String personGooglePlusProfile = currentPerson.getUrl();
                String personEmail = Plus.AccountApi.getAccountName(mGoogleApiClient);

                Log.e(TAG, "Name: " + personName + ", "
                        + "plusProfile: " + personGooglePlusProfile + ", "
                        + "email: " + personEmail + ", "
                        + "image: " + personPhotoUrl);

                txtName.setText(personName);
                txtEmail.setText(personEmail);

                // by default the profile url gives 50x50 px image,
                // but we can replace the value with whatever dimension we
                // want by replacing sz=X
                personPhotoUrl = personPhotoUrl.substring(0, personPhotoUrl.length() - 2)
                        + PROFILE_PIC_SIZE;

                new LoadProfileImage(imgProfilePic).execute(personPhotoUrl);
            }
            else{
                Toast.makeText(getApplicationContext(), "Person information is null", Toast.LENGTH_LONG).show();
            }
        }
        catch(Exception ex){
            ex.printStackTrace();
        }
    }

    // Sign-out from Google
    private void signOutFromGPlus(){
        if(mGoogleApiClient.isConnected()){
            Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
            mGoogleApiClient.disconnect();
            mGoogleApiClient.connect();
            updateUI(false);
        }
    }

    // Revoking access from Google
    private void revokeGPlusAccess(){
        if(mGoogleApiClient.isConnected()){
            Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
            Plus.AccountApi.revokeAccessAndDisconnect(mGoogleApiClient)
                .setResultCallback(new ResultCallback<Status>(){
                    @Override
                    public void onResult(Status s){
                        Log.e(TAG, "User access revoked!");
                        mGoogleApiClient.connect();
                        updateUI(false);
                    }
                });
        }
    }

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

        return super.onOptionsItemSelected(item);
    }
}

LoadProfileImage.java:

LoadProfileImage.java：

package com.example.testproject_gmaillogin;

import java.io.InputStream;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;

/**
 * Background async task to load user profile picture from url
 **/
public class LoadProfileImage extends AsyncTask<String, Void, Bitmap> {
    private ImageView bmImage;

    public LoadProfileImage(ImageView bmImage){
        this.bmImage = bmImage;
    }

    @Override
    protected Bitmap doInBackground(String... urls){
        String urlDisplay = urls[0];
        Bitmap mIcon11 = null;
        try{
            InputStream in = new java.net.URL(urlDisplay).openStream();
            mIcon11 = BitmapFactory.decodeStream(in);
        }
        catch(Exception ex){
            Log.e("Error", ex.getMessage());
            ex.printStackTrace();
        }
        return mIcon11;
    }

    @Override
    protected void onPostExecute(Bitmap result){
        bmImage.setImageBitmap(result);
    }
}

The other steps I did were:

我做的其他步骤是：

At https://console.developers.google.com/projectI've created a project with:

在https://console.developers.google.com/project我创建了一个项目：

Google+ API on:

Google+ API 在：

And a Client ID created with the correct SHA1 and exact same namespace as the project:

以及使用正确的 SHA1 和与项目完全相同的命名空间创建的客户端 ID：

At Eclipse:

在日食：

I've installed the google-play-services library:

我已经安装了 google-play-services 库：

And added it to the project:

并将其添加到项目中：

I've also created an Emulator with version 4.4.2:

我还创建了一个版本为 4.4.2 的模拟器：

But when I run the app I get the following error, and this error keeps popping up when I click on the button:

但是当我运行该应用程序时出现以下错误，并且当我单击按钮时不断弹出此错误：

Anyone has any idea where it goes wrong? Thanks in advance for the responses.

任何人都知道哪里出了问题？预先感谢您的答复。

采纳答案by Kevin Cruijssen

Ok, after trying some things it turned out I had one last option not correctly checked, which wasn't mentioned anywhere in the tutorial(s)..

好的，在尝试了一些事情之后，结果我没有正确检查最后一个选项，教程中没有提到它。

Instead of Android 4.4.2 as Project Build Target & Emulator Target, I've selected Google APIs 4.4.2. Now I don't get the error of Google Play services anymore.

我选择了 Google API 4.4.2，而不是 Android 4.4.2 作为项目构建目标和模拟器目标。现在我不再收到 Google Play 服务的错​​误了。

I do get a NullPointerException though, but at least I can continue.. ;)

虽然我确实收到了 NullPointerException，但至少我可以继续.. ;)

EDIT: Fixed the NullPointerException and modified the code in my original post. Everything works as it should now and I hope this post helps other people with the same (or other) errors using google play services sign-in using an Android Emulator.

编辑：修复了 NullPointerException 并修改了我原来帖子中的代码。现在一切正常，我希望这篇文章可以帮助其他人使用谷歌播放服务使用 Android 模拟器登录时遇到相同（或其他）错误。

回答by Dr.Jukka

Try using the Goole APIs API level 19 as emulator target instead of normal API level 19.

尝试使用 Goole APIs API 级别 19 作为模拟器目标，而不是普通的 API 级别 19。