Switch from WebView to CustomTabs

app/build.gradle

@@ -64,10 +64,12 @@ dependencies {
     // https://developer.android.com/topic/libraries/architecture/adding-components.html
     implementation "android.arch.lifecycle:extensions:$lifecycle_version"
     implementation "android.arch.persistence.room:runtime:$room_version"
+    implementation "android.arch.paging:runtime:$paging_version"
     annotationProcessor "android.arch.lifecycle:compiler:$lifecycle_version"
     annotationProcessor "android.arch.persistence.room:compiler:$room_version"
 
-    implementation "android.arch.paging:runtime:$paging_version"
+    // https://developer.android.com/topic/libraries/support-library/packages#custom-tabs
+    implementation "com.android.support:customtabs:$support_version"
 
     // https://javaee.github.io/javamail/
     implementation "com.sun.mail:android-mail:$javamail_version"
@@ -75,4 +77,5 @@ dependencies {
 
     // https://jsoup.org/
     implementation "org.jsoup:jsoup:$jsoup_version"
+
 }

app/src/main/java/eu/faircode/email/FragmentMessage.java

@@ -24,10 +24,12 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.graphics.Typeface;
+import android.net.Uri;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.constraint.Group;
+import android.support.customtabs.CustomTabsIntent;
 import android.support.design.widget.BottomNavigationView;
 import android.support.v4.app.FragmentTransaction;
 import android.support.v4.app.LoaderManager;
@@ -134,8 +136,18 @@ public class FragmentMessage extends FragmentEx {
 
                 URLSpan[] link = buffer.getSpans(off, off, URLSpan.class);
                 if (link.length != 0) {
+                    String url = link[0].getURL();
+
+                    if (true) {
+                        // https://developer.chrome.com/multidevice/android/customtabs
+                        CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
+                        builder.setToolbarColor(Helper.resolveColor(getContext(), R.attr.colorPrimary));
+
+                        CustomTabsIntent customTabsIntent = builder.build();
+                        customTabsIntent.launchUrl(getContext(), Uri.parse(url));
+                    } else {
                         Bundle args = new Bundle();
-                    args.putString("link", link[0].getURL());
+                        args.putString("link", url);
 
                         FragmentWebView fragment = new FragmentWebView();
                         fragment.setArguments(args);
@@ -144,6 +156,7 @@ public class FragmentMessage extends FragmentEx {
                         fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("webview");
                         fragmentTransaction.commit();
                     }
+                }
                 return true;
             }
         });