Fix memory leak, switch to auto managed clients where possible (firebase#334)

Author: amandle

auth/src/main/java/com/firebase/ui/auth/ui/account_link/SaveCredentialsActivity.java

@@ -80,26 +80,10 @@ protected void onCreate(Bundle savedInstanceState) {
                 .addConnectionCallbacks(this)
                 .addOnConnectionFailedListener(this)
                 .addApi(Auth.CREDENTIALS_API)
+                .enableAutoManage(this, this)
                 .build();
-        mCredentialsApiClient.connect();
     }
 
-
-    @Override
-    protected void onStart() {
-        super.onStart();
-        mCredentialsApiClient.connect();
-    }
-
-    @Override
-    protected void onStop() {
-        super.onStop();
-        if (mCredentialsApiClient != null) {
-            mCredentialsApiClient.disconnect();
-        }
-    }
-
-
     @Override
     public void onConnected(@Nullable Bundle bundle) {
         if (mEmail == null) {

auth/src/main/java/com/firebase/ui/auth/ui/email/SignInActivity.java

@@ -126,6 +126,7 @@ public void onFailure(@NonNull Exception e) {
                         TextInputLayout passwordInput =
                                 (TextInputLayout) findViewById(R.id.password_layout);
                         passwordInput.setError(getString(R.string.login_error));
+                        mActivityHelper.dismissDialog();
                     }
                 });
     }

auth/src/main/java/com/firebase/ui/auth/util/FirebaseAuthWrapper.java

@@ -21,6 +21,7 @@
 import android.support.annotation.Nullable;
 import android.support.annotation.WorkerThread;
 
+import android.support.v4.app.FragmentActivity;
 import com.google.firebase.auth.AuthCredential;
 import com.google.firebase.auth.FirebaseUser;
 
@@ -68,7 +69,7 @@ FirebaseUser linkWithCredential(
 
     boolean isPlayServicesAvailable(Context context);
 
-    PendingIntent getEmailHintIntent(Context context);
+    PendingIntent getEmailHintIntent(FragmentActivity context);
 
     void setTimeOut(long timeoutMs);
 

auth/src/main/java/com/firebase/ui/auth/util/FirebaseAuthWrapperImpl.java

@@ -14,12 +14,14 @@
 
 package com.firebase.ui.auth.util;
 
+import android.app.Fragment;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.annotation.WorkerThread;
+import android.support.v4.app.FragmentActivity;
 import android.util.Log;
 
 import com.firebase.ui.auth.BuildConfig;
@@ -29,6 +31,7 @@
 import com.google.android.gms.common.ConnectionResult;
 import com.google.android.gms.common.GoogleApiAvailability;
 import com.google.android.gms.common.api.GoogleApiClient;
+import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
 import com.google.android.gms.tasks.Task;
 import com.google.android.gms.tasks.Tasks;
 import com.google.firebase.auth.AuthCredential;
@@ -153,18 +156,23 @@ protected boolean isPlayServicesAvailable(
     }
 
     @Override
-    public PendingIntent getEmailHintIntent(Context context) {
-        if (!isPlayServicesAvailable(context, GoogleApiAvailability.getInstance())) {
+    public PendingIntent getEmailHintIntent(FragmentActivity fragmentActivity) {
+        if (!isPlayServicesAvailable(fragmentActivity, GoogleApiAvailability.getInstance())) {
             return null;
         }
 
-        GoogleApiClient client = new GoogleApiClient.Builder(context)
+        GoogleApiClient client = new GoogleApiClient.Builder(fragmentActivity)
                 .addConnectionCallbacks(this)
                 .addApi(Auth.CREDENTIALS_API)
+                .enableAutoManage(fragmentActivity, new OnConnectionFailedListener() {
+                    @Override
+                    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
+                        Log.e(TAG,
+                            "Client connection failed: " + connectionResult.getErrorMessage());
+                    }
+                })
                 .build();
 
-        client.connect();
-
         HintRequest hintRequest = new HintRequest.Builder()
                 .setHintPickerConfig(new CredentialPickerConfig.Builder()
                         .setShowCancelButton(true)