feature/android 1cd514c297f: Improve appearance of custom dialog buttons on Android

[Po Lu]

branch: feature/android
commit 1cd514c297fb570b35b257ee9880b729e35a1068
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Improve appearance of custom dialog buttons on Android
    
    * java/org/gnu/emacs/EmacsDialog.java (toAlertDialog): Resolve
    dialog button style and use it instead.
---
 java/org/gnu/emacs/EmacsDialog.java | 72 ++++++++++++++++++++++++++++++-------
 1 file changed, 60 insertions(+), 12 deletions(-)

diff --git a/java/org/gnu/emacs/EmacsDialog.java 
b/java/org/gnu/emacs/EmacsDialog.java
index 3f8fe0109c0..5f48a9a5f9f 100644
--- a/java/org/gnu/emacs/EmacsDialog.java
+++ b/java/org/gnu/emacs/EmacsDialog.java
@@ -27,6 +27,10 @@ import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
 
+import android.content.res.Resources.NotFoundException;
+import android.content.res.Resources.Theme;
+import android.content.res.TypedArray;
+
 import android.os.Build;
 
 import android.provider.Settings;
@@ -148,13 +152,17 @@ public final class EmacsDialog implements 
DialogInterface.OnDismissListener
   toAlertDialog (Context context)
   {
     AlertDialog dialog;
-    int size;
+    int size, styleId;
+    int[] attrs;
     EmacsButton button;
     EmacsDialogButtonLayout layout;
     Button buttonView;
     ViewGroup.LayoutParams layoutParams;
+    Theme theme;
+    TypedArray attributes;
 
     size = buttons.size ();
+    styleId = -1;
 
     if (size <= 3)
       {
@@ -193,19 +201,10 @@ public final class EmacsDialog implements 
DialogInterface.OnDismissListener
     else
       {
        /* There are more than 3 buttons.  Add them all to a special
-          container widget that handles wrapping.  */
+          container widget that handles wrapping.  First, create the
+          layout.  */
 
        layout = new EmacsDialogButtonLayout (context);
-
-       for (EmacsButton emacsButton : buttons)
-         {
-           buttonView = new Button (context);
-           buttonView.setText (emacsButton.name);
-           buttonView.setOnClickListener (emacsButton);
-           buttonView.setEnabled (emacsButton.enabled);
-           layout.addView (buttonView);
-         }
-
        layoutParams
          = new FrameLayout.LayoutParams (ViewGroup.LayoutParams.MATCH_PARENT,
                                          ViewGroup.LayoutParams.WRAP_CONTENT);
@@ -223,6 +222,55 @@ public final class EmacsDialog implements 
DialogInterface.OnDismissListener
 
        if (title != null)
          dialog.setTitle (title);
+
+       /* Now that the dialog has been created, set the style of each
+          custom button to match the usual dialog buttons found on
+          Android 5 and later.  */
+
+       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
+         {
+           /* Obtain the Theme associated with the dialog.  */
+           theme = dialog.getContext ().getTheme ();
+
+           /* Resolve the dialog button style.  */
+           attrs
+             = new int [] { android.R.attr.buttonBarNeutralButtonStyle, };
+
+           try
+             {
+               attributes = theme.obtainStyledAttributes (attrs);
+
+               /* Look for the style ID.  Default to -1 if it could
+                  not be found.  */
+               styleId = attributes.getResourceId (0, -1);
+
+               /* Now clean up the TypedAttributes object.  */
+               attributes.recycle ();
+             }
+           catch (NotFoundException e)
+             {
+               /* Nothing to do here.  */
+             }
+         }
+
+       /* Create each button and add it to the layout.  Set the style
+          if necessary.  */
+
+       for (EmacsButton emacsButton : buttons)
+         {
+           if (styleId == -1)
+             /* No specific style... */
+             buttonView = new Button (context);
+           else
+             /* Use the given styleId.  */
+             buttonView = new Button (context, null, 0, styleId);
+
+           /* Set the text and on click handler.  */
+           buttonView.setText (emacsButton.name);
+           buttonView.setOnClickListener (emacsButton);
+           buttonView.setEnabled (emacsButton.enabled);
+           layout.addView (buttonView);
+         }
       }
 
     return dialog;