Fix battery usage screen issues

Tint icons properly
Bug: 21077770

Show better icons for wifi and bt (remove the old ones)
Bug: 21172936

Also add a way to show fake items in power list for testing.

Change-Id: I6b6804673a68190ebc3f2ea32802e30811a7f5b2

src/com/android/settings/TintablePreference.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2015 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;
+
+import android.content.Context;
+import android.content.res.ColorStateList;
+import android.preference.Preference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.ImageView;
+
+public class TintablePreference extends Preference {
+
+    private int mTintColor;
+
+    public TintablePreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public void setTint(int color) {
+        mTintColor = color;
+        notifyChanged();
+    }
+
+    @Override
+    protected void onBindView(View view) {
+        super.onBindView(view);
+
+        if (mTintColor != 0) {
+            ((ImageView) view.findViewById(R.id.icon)).setImageTintList(
+                    ColorStateList.valueOf(mTintColor));
+        }
+    }
+}