Add empty host-list screen to Android Chromoting app

This shows a nicer-looking screen with an icon, some text, and some
hyperlink text. The hyperlink opens the Help activity with a web-site
that helps the user set up their hosts for remote access.

NOTRY=true

Review URL: https://codereview.chromium.org/210223008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@259510 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 19 insertions, 2 deletions

diff --git a/remoting/android/java/src/org/chromium/chromoting/Chromoting.java b/remoting/android/java/src/org/chromium/chromoting/Chromoting.java
index 05523c7..8727d95 100644
--- a/remoting/android/java/src/org/chromium/chromoting/Chromoting.java
+++ b/remoting/android/java/src/org/chromium/chromoting/Chromoting.java
@@ -38,8 +38,8 @@ import java.util.Arrays;
  * also requests and renews authentication tokens using the system account manager.
  */
 public class Chromoting extends Activity implements JniInterface.ConnectionListener,
-        AccountManagerCallback<Bundle>, ActionBar.OnNavigationListener,
-        HostListLoader.Callback {
+        AccountManagerCallback<Bundle>, ActionBar.OnNavigationListener, HostListLoader.Callback,
+        View.OnClickListener {
     /** Only accounts of this type will be selectable for authentication. */
     private static final String ACCOUNT_TYPE = "com.google";
 
@@ -51,6 +51,10 @@ public class Chromoting extends Activity implements JniInterface.ConnectionListe
     private static final String HELP_URL =
             "http://support.google.com/chrome/?p=mobile_crd_hostslist";
 
+    /** Web page to be displayed when user triggers the hyperlink for setting up hosts. */
+    private static final String HOST_SETUP_URL =
+            "https://support.google.com/chrome/answer/1649523";
+
     /** User's account details. */
     private Account mAccount;
 
@@ -123,6 +127,11 @@ public class Chromoting extends Activity implements JniInterface.ConnectionListe
     private void setHostListProgressVisible(boolean visible) {
         mHostListView.setVisibility(visible ? View.GONE : View.VISIBLE);
         mProgressView.setVisibility(visible ? View.VISIBLE : View.GONE);
+
+        // Hiding the host-list does not automatically hide the empty view, so do that here.
+        if (visible) {
+            mHostListView.getEmptyView().setVisibility(View.GONE);
+        }
     }
 
     /**
@@ -142,6 +151,8 @@ public class Chromoting extends Activity implements JniInterface.ConnectionListe
         mHostListView.setEmptyView(findViewById(R.id.hostList_empty));
         mProgressView = findViewById(R.id.hostList_progress);
 
+        findViewById(R.id.host_setup_link_android).setOnClickListener(this);
+
         // Bring native components online.
         JniInterface.loadLibrary(this);
 
@@ -230,6 +241,12 @@ public class Chromoting extends Activity implements JniInterface.ConnectionListe
         }
     }
 
+    /** Called when the user touches hyperlinked text. */
+    @Override
+    public void onClick(View view) {
+        HelpActivity.launch(this, HOST_SETUP_URL);
+    }
+
     /** Called when the user taps on a host entry. */
     public void connectToHost(HostInfo host) {
         mProgressIndicator = ProgressDialog.show(this,