GoogleApiClient onConnectionFailed with statusCode=SIGN_IN_REQUIRED
<p>I'm trying to connect my app to Google play service to access Google Drive but It showing me <strong>connection failed</strong> with statusCode <code>SIGN_IN_REQUIRED.</code></p>

<p>But it seems to behave like that just 3 days ago. I am also checked developer console of google. They may have changed something in the API which i am unable to figure out. Your help will be welcome.</p>

<p>My Code:</p>

<pre><code>/**
 * Create a new file and save it to Drive.
 */
    private void saveFileToDrive(final byte[] data) {
    // Start by creating a new contents, and setting a callback.
    Log.i(TAG, "Creating new contents.");
    //final Bitmap image = mBitmapToSave;
    Drive.DriveApi.newDriveContents(mGoogleApiClient)
            .setResultCallback(new ResultCallback&lt;DriveApi.DriveContentsResult&gt;() {

                @Override
                public void onResult(DriveApi.DriveContentsResult result) {
                    // If the operation was not successful, we cannot do anything
                    // and must
                    // fail.
                    if (!result.getStatus().isSuccess()) {
                        Log.i(TAG, "Failed to create new contents.");
                        return;
                    }
                    // Otherwise, we can write our data to the new contents.
                    Log.i(TAG, "New contents created.");
                    // Get an output stream for the contents.
                    OutputStream outputStream = result.getDriveContents().getOutputStream();
                    // Write the bitmap data from it.
                   /* ByteArrayOutputStream bitmapStream = new ByteArrayOutputStream();
                    image.compress(Bitmap.CompressFormat.PNG, 100, bitmapStream);*/
                    try {
                        //outputStream.write(bitmapStream.toByteArray());
                        outputStream.write(data);
                    } catch (IOException e1) {
                        Log.i(TAG, "Unable to write file contents.");
                    }
                    // Create the initial metadata - MIME type and title.
                    // Note that the user will be able to change the title later.
                    MetadataChangeSet metadataChangeSet = new MetadataChangeSet.Builder()
                            .setMimeType("application/pdf").setTitle(filename).build();
                    // Create an intent for the file chooser, and start it.
                    IntentSender intentSender = Drive.DriveApi
                            .newCreateFileActivityBuilder()
                            .setInitialMetadata(metadataChangeSet)
                            .setInitialDriveContents(result.getDriveContents())
                            .build(mGoogleApiClient);
                    try {
                        startIntentSenderForResult(
                                intentSender, REQUEST_CODE_CREATOR, null, 0, 0, 0);
                    } catch (IntentSender.SendIntentException e) {
                        Log.i(TAG, "Failed to launch file chooser.");
                    }
                }
            });
}

@Override
protected void onResume() {
    super.onResume();
    if (mGoogleApiClient == null) {
        // Create the API client and bind it to an instance variable.
        // We use this instance as the callback for connection and connection
        // failures.
        // Since no account name is passed, the user is prompted to choose.
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(Drive.API)
                .addScope(Drive.SCOPE_FILE)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();
    }
    // Connect the client. Once connected, the camera is launched.
    mGoogleApiClient.connect();

}



@Override
protected void onPause() {
    if (mGoogleApiClient != null) {
        mGoogleApiClient.disconnect();
    }
    super.onPause();
}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
        case REQUEST_CODE_CREATOR:
            // Called after a file is saved to Drive.
            if (resultCode == RESULT_OK) {
                Log.i(TAG, "Image successfully saved.");

                Intent intent = new Intent();
                intent.putExtra("FILE_PATH",file_path);
                PreviewActivity.this.setResult(RESULT_OK, intent);
                finish();
                progressDialog.hide();

            }
            break;
    }
}

@Override
public void onConnected(Bundle bundle) {

    Log.i(TAG, "API client connected.");
    //saveFileToDrive();
}

@Override
public void onConnectionSuspended(int i) {
    Log.i(TAG, "GoogleApiClient connection suspended");
}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
    // Called whenever the API client fails to connect.
    Log.i(TAG, "GoogleApiClient connection failed: " + connectionResult.toString());
    if (!connectionResult.hasResolution()) {
        // show the localized error dialog.
        GoogleApiAvailability.getInstance().getErrorDialog(this, connectionResult.getErrorCode(), 0).show();
        return;
    }
    // The failure has a resolution. Resolve it.
    // Called typically when the app is not yet authorized, and an
    // authorization
    // dialog is displayed to the user.
    try {
        connectionResult.startResolutionForResult(this, REQUEST_CODE_RESOLUTION);
    } catch (IntentSender.SendIntentException e) {
        Log.e(TAG, "Exception while starting resolution activity", e);
    }
}
</code></pre>

<p>/<em>END OF CODE</em>/</p>

<p>Gradle:</p>

<pre><code>apply plugin: 'com.android.application'

android {


dexOptions {
    incremental true
    javaMaxHeapSize "2048M"

}

compileSdkVersion 23
buildToolsVersion '23.0.2'
defaultConfig {
    multiDexEnabled true
    applicationId "com.woundcentrics.abxsteward"
    minSdkVersion 14
    targetSdkVersion 21
    versionCode 1
    versionName "0.4 (Beta)"

}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
packagingOptions {
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/NOTICE.txt'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/DEPENDENCIES'
}
productFlavors {
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'org.robolectric:robolectric:3.0'
compile project(':openCVLibrary310')
compile files('libs/itextpdf-5.1.0.jar')
compile project(':scanlibrary')
apply plugin: 'com.google.gms.google-services'
compile 'me.dm7.barcodescanner:zbar:1.8.3'
compile 'com.mcxiaoke.volley:library-aar:1.0.0'
compile 'com.google.code.gson:gson:2.4'
compile 'com.android.support:appcompat-v7:23.0.0'
compile 'com.google.android.gms:play-services:8.3.0'
compile 'com.google.android.gms:play-services-ads:8.3.0'
compile 'com.google.android.gms:play-services-identity:8.3.0'
compile 'com.google.android.gms:play-services-gcm:8.3.0'

}
repositories {
jcenter()

}
</code></pre>

<p><strong>Logcat Message:</strong></p>

<pre><code>GoogleApiClient connection failed: ConnectionResult{statusCode=SIGN_IN_REQUIRED, resolution=PendingIntent{21d08740: android.os.BinderProxy@21d032b8}, message=null}
</code></pre>