Add cellular network warning

app/src/main/java/com/hippo/ehviewer/Settings.java

@@ -412,6 +412,13 @@ public class Settings {
         putString(KEY_HATH_PASSKEY, value);
     }
 
+    private static final String KEY_CELLULAR_NETWORK_WARNING = "cellular_network_warning";
+    private static final boolean DEFAULT_CELLULAR_NETWORK_WARNING = false;
+
+    public static boolean getCellularNetworkWarning() {
+        return getBoolean(KEY_CELLULAR_NETWORK_WARNING, DEFAULT_CELLULAR_NETWORK_WARNING);
+    }
+
     /********************
      ****** Read
      ********************/

app/src/main/java/com/hippo/ehviewer/ui/MainActivity.java

@@ -20,6 +20,7 @@ import android.Manifest;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.graphics.Bitmap;
+import android.net.ConnectivityManager;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
@@ -70,6 +71,7 @@ import com.hippo.ehviewer.ui.scene.WarningScene;
 import com.hippo.ehviewer.ui.scene.WebViewSignInScene;
 import com.hippo.ehviewer.widget.EhDrawerLayout;
 import com.hippo.io.UniFileInputStreamPipe;
+import com.hippo.network.Network;
 import com.hippo.scene.Announcer;
 import com.hippo.scene.SceneFragment;
 import com.hippo.scene.StageActivity;
@@ -392,6 +394,9 @@ public final class MainActivity extends StageActivity
             onInit();
             CommonOperations.checkUpdate(this, false);
             checkDownloadLocation();
+            if (Settings.getCellularNetworkWarning()) {
+                checkCellularNetwork();
+            }
         } else {
             onRestore(savedInstanceState);
         }
@@ -410,6 +415,12 @@ public final class MainActivity extends StageActivity
                 .show();
     }
 
+    private void checkCellularNetwork() {
+        if (Network.getActiveNetworkType(this) == ConnectivityManager.TYPE_MOBILE) {
+            showTip(R.string.cellular_network_warning, BaseScene.LENGTH_SHORT);
+        }
+    }
+
     private void onInit() {
         // Check permission
         PermissionRequester.request(this, Manifest.permission.WRITE_EXTERNAL_STORAGE,

app/src/main/java/com/hippo/network/Network.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2014 Hippo Seven
+ *
+ * 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.hippo.network;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+
+public final class Network {
+    private Network() {}
+
+    public static int getActiveNetworkType(Context context) {
+        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
+        if (activeNetwork != null) {
+            return activeNetwork.getType();
+        } else {
+            return -1;
+        }
+    }
+}