Use a common style for custom preference icon layouts

Change-Id: Ief3bc54f700cb891041adf92846149c6f41caad0
Fix: 35961001
Test: instrumentation test

tests/unit/src/com/android/settings/dashboard/FirstIdViewMatcher.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.android.settings.dashboard;
+
+import android.content.res.Resources;
+import android.view.View;
+
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
+import org.hamcrest.TypeSafeMatcher;
+
+/***
+ * Matches on the first view with id if there are multiple views using the same Id.
+ */
+public class FirstIdViewMatcher {
+
+    public static Matcher<View> withFirstId(final int id) {
+        return new TypeSafeMatcher<View>() {
+            Resources resources = null;
+            private boolean mMatched;
+
+            public void describeTo(Description description) {
+                String idDescription = Integer.toString(id);
+                if (resources != null) {
+                    try {
+                        idDescription = resources.getResourceName(id);
+                    } catch (Resources.NotFoundException e) {
+                        // No big deal, will just use the int value.
+                        idDescription = String.format("%s (resource name not found)", id);
+                    }
+                }
+                description.appendText("with first id: " + idDescription);
+            }
+
+            public boolean matchesSafely(View view) {
+                this.resources = view.getResources();
+                if (mMatched) {
+                    return false;
+                } else {
+                    mMatched = id == view.getId();
+                    return mMatched;
+                }
+            }
+        };
+    }
+}