1 files changed, 54 insertions, 0 deletions
diff --git a/main/src/cgeo/geocaching/settings/AbstractAttributeBasedPrefence.java b/main/src/cgeo/geocaching/settings/AbstractAttributeBasedPrefence.java
new file mode 100644
index 0000000..1930c17
--- /dev/null
+++ b/main/src/cgeo/geocaching/settings/AbstractAttributeBasedPrefence.java
@@ -0,0 +1,54 @@
+package cgeo.geocaching.settings;
+
+import org.eclipse.jdt.annotation.Nullable;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.preference.Preference;
+import android.util.AttributeSet;
+
+/**
+ * Base class for preferences which evaluate their XML attributes for further processing.
+ *
+ */
+public abstract class AbstractAttributeBasedPrefence extends Preference {
+
+    public AbstractAttributeBasedPrefence(Context context) {
+        super(context);
+    }
+
+    public AbstractAttributeBasedPrefence(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        processAttributes(context, attrs, 0);
+    }
+
+    public AbstractAttributeBasedPrefence(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        processAttributes(context, attrs, defStyle);
+    }
+
+    private void processAttributes(Context context, @Nullable AttributeSet attrs, int defStyle) {
+        if (attrs == null) {
+            return;
+        }
+        TypedArray types = context.obtainStyledAttributes(attrs, getAttributeNames(),
+                defStyle, 0);
+
+        processAttributeValues(types);
+
+        types.recycle();
+    }
+
+    /**
+     * Evaluate the attributes which where requested in {@link AbstractAttributeBasedPrefence#getAttributeNames()}.
+     * 
+     * @param values
+     */
+    protected abstract void processAttributeValues(TypedArray values);
+
+    /**
+     * @return the names of the attributes you want to read in your preference implementation
+     */
+    protected abstract int[] getAttributeNames();
+
+}