Handle different error codes in DPP

Show error message for corresponding Wi-Fi DPP error code. And

1. To update error message only from each fragment,
   remove some callbacks which calls from fragment to activity.
2. After clicking 'Share Wi-Fi' button, hide it before Wi-Fi DPP handshake completes.
3. Show 'Done' button for some error codes.
4. Use ViewModel to call startEasyConnectAsConfiguratorInitiator and
   startEasyConnectAsEnrolleeInitiator because a lifecycle object
   does not receive an Executor callback after configurator change.
5. In WifiDppQrCodeScannerFragment, show an error message for 10s instead of 2s
   since new added error messages may carry more information.
6. Show a different error message for enrollee handshake success but Wi-Fi
   connection fail case.
7. stop camera when scanned a Wi-Fi DPP QR code for enrollee.
8. In QR code scanner fragment, support to show error message after
    configuration change.

Bug: 124247872
Bug: 124491247
Test: manual test
      atest WifiQrCodeTest
      atest WifiDppConfiguratorActivityTest
      atest WifiDppEnrolleeActivityTest
      atest WifiDppQrCodeGeneratorFragmentTest
      atest WifiDppQrCodeScannerFragmentTest
      atest WifiNetworkListFragmentTest
      atest WifiDppChooseSavedWifiNetworkFragmentTest

Change-Id: Id130215e9ddafac8bc4c68238deda48ce99b4255

src/com/android/settings/wifi/dpp/WifiDppInitiatorViewModel.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.wifi.dpp;
+
+import android.app.Application;
+import android.net.wifi.EasyConnectStatusCallback;
+import android.net.wifi.WifiManager;
+
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.AndroidViewModel;
+
+public class WifiDppInitiatorViewModel extends AndroidViewModel {
+    private MutableLiveData<Integer> mEnrolleeSuccessNetworkId;
+    private MutableLiveData<Integer> mStatusCode;
+    private boolean mIsGoingInitiator;
+
+    public WifiDppInitiatorViewModel(Application application) {
+        super(application);
+    }
+
+    public MutableLiveData<Integer> getEnrolleeSuccessNetworkId() {
+        if (mEnrolleeSuccessNetworkId == null) {
+            mEnrolleeSuccessNetworkId = new MutableLiveData<>();
+        }
+
+        return mEnrolleeSuccessNetworkId;
+    }
+
+    public MutableLiveData<Integer> getStatusCode() {
+        if (mStatusCode == null) {
+            mStatusCode = new MutableLiveData<>();
+        }
+
+        return mStatusCode;
+    }
+
+    public boolean isGoingInitiator() {
+        return mIsGoingInitiator;
+    }
+
+    public void startEasyConnectAsConfiguratorInitiator(String qrCode, int networkId) {
+        mIsGoingInitiator = true;
+        final WifiManager wifiManager = getApplication().getSystemService(WifiManager.class);
+
+        wifiManager.startEasyConnectAsConfiguratorInitiator(qrCode, networkId,
+                WifiManager.EASY_CONNECT_NETWORK_ROLE_STA, getApplication().getMainExecutor(),
+                new EasyConnectDelegateCallback());
+    }
+
+    public void startEasyConnectAsEnrolleeInitiator(String qrCode) {
+        mIsGoingInitiator = true;
+        final WifiManager wifiManager = getApplication().getSystemService(WifiManager.class);
+
+        wifiManager.startEasyConnectAsEnrolleeInitiator(qrCode, getApplication().getMainExecutor(),
+                new EasyConnectDelegateCallback());
+    }
+
+    private class EasyConnectDelegateCallback extends EasyConnectStatusCallback {
+        @Override
+        public void onEnrolleeSuccess(int newNetworkId) {
+            mIsGoingInitiator = false;
+            mEnrolleeSuccessNetworkId.setValue(newNetworkId);
+        }
+
+        @Override
+        public void onConfiguratorSuccess(int code) {
+            mIsGoingInitiator = false;
+            mStatusCode.setValue(WifiDppUtils.EASY_CONNECT_EVENT_SUCCESS);
+        }
+
+        @Override
+        public void onFailure(int code) {
+            mIsGoingInitiator = false;
+            mStatusCode.setValue(code);
+        }
+
+        @Override
+        public void onProgress(int code) {
+            // Do nothing
+        }
+    }
+}