Introduce MemoryUsagePreferenceController

 - Use a hard-coded preference instead of injecting
 so that search can index the preference
 - Create a preference controller to update the summary

Change-Id: Idf822ccbb7a58a9ec561d5c2c2948dbc3272544f
fixes: 36463051
Test: Manual using settings app

1 files changed, 78 insertions, 0 deletions

diff --git a/src/com/android/settings/development/MemoryUsagePreferenceController.java b/src/com/android/settings/development/MemoryUsagePreferenceController.java
new file mode 100644
index 0000000000..1b589fd329
--- /dev/null
+++ b/src/com/android/settings/development/MemoryUsagePreferenceController.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2017 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.development;
+
+import android.content.Context;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.text.format.Formatter;
+
+import com.android.settings.R;
+import com.android.settings.applications.ProcStatsData;
+import com.android.settings.applications.ProcessStatsBase;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+public class MemoryUsagePreferenceController extends DeveloperOptionsPreferenceController implements
+        PreferenceControllerMixin {
+
+    private static final String MEMORY_USAGE_KEY = "memory";
+
+    private Preference mPreference;
+    private ProcStatsData mProcStatsData;
+
+    public MemoryUsagePreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return MEMORY_USAGE_KEY;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        mPreference = screen.findPreference(getPreferenceKey());
+        mProcStatsData = getProcStatsData();
+        setDuration();
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        mProcStatsData.refreshStats(true);
+        final ProcStatsData.MemInfo memInfo = mProcStatsData.getMemInfo();
+        final String usedResult = Formatter.formatShortFileSize(mContext,
+                (long) memInfo.realUsedRam);
+        final String totalResult = Formatter.formatShortFileSize(mContext,
+                (long) memInfo.realTotalRam);
+        mPreference.setSummary(mContext.getString(R.string.memory_summary,
+                usedResult, totalResult));
+    }
+
+    @VisibleForTesting
+    void setDuration() {
+        mProcStatsData.setDuration(ProcessStatsBase.sDurations[0] /* 3 hours */);
+    }
+
+    @VisibleForTesting
+    ProcStatsData getProcStatsData() {
+        return new ProcStatsData(mContext, false);
+    }
+}