Show history of battery level.

Also clean up to remove dead code for running services and old
battery usage UI.

Finally some string improvements from Roy.

Change-Id: I8765a4c744b92edd1505f14c47fea57b918e5d7b

src/com/android/settings/fuelgauge/BatteryHistoryPreference.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2010 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.fuelgauge;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.os.BatteryStats;
+import android.preference.Preference;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.android.settings.R;
+
+/**
+ * Custom preference for displaying power consumption as a bar and an icon on the left for the
+ * subsystem/app type.
+ *
+ */
+public class BatteryHistoryPreference extends Preference {
+
+    private BatteryStats mStats;
+
+    public BatteryHistoryPreference(Context context, BatteryStats stats) {
+        super(context);
+        setLayoutResource(R.layout.preference_batteryhistory);
+        mStats = stats;
+    }
+
+    BatteryStats getStats() {
+        return mStats;
+    }
+
+    @Override
+    protected void onBindView(View view) {
+        super.onBindView(view);
+
+        BatteryHistoryChart chart = (BatteryHistoryChart)view.findViewById(
+                R.id.battery_history_chart);
+        chart.setStats(mStats);
+    }
+}