Create a permission bar chart in Privacy page

Using PermissionControllerManager to get the apps
usage of different permission groups.

And then we visualize the result with bar chart.

Test: visual, robotest
Fixes: 116628158
Change-Id: I0442a04c35d74f715418fac0279bb8f36f6d64df

src/com/android/settings/privacy/PermissionBarChartPreferenceController.java

@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2019 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.privacy;
+
+import static com.android.settingslib.widget.BarChartPreference.MAXIMUM_BAR_VIEWS;
+
+import static java.util.concurrent.TimeUnit.DAYS;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.graphics.drawable.Drawable;
+import android.permission.PermissionControllerManager;
+import android.permission.RuntimePermissionUsageInfo;
+import android.util.Log;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.widget.BarChartInfo;
+import com.android.settingslib.widget.BarChartPreference;
+import com.android.settingslib.widget.BarViewInfo;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.concurrent.Executors;
+
+
+public class PermissionBarChartPreferenceController extends BasePreferenceController implements
+        PermissionControllerManager.OnPermissionUsageResultCallback {
+
+    private static final String TAG = "BarChartPreferenceCtl";
+
+    private PackageManager mPackageManager;
+    private BarChartPreference mBarChartPreference;
+    private List<RuntimePermissionUsageInfo> mOldUsageInfos;
+
+    public PermissionBarChartPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mOldUsageInfos = new ArrayList<>();
+        mPackageManager = context.getPackageManager();
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE_UNSEARCHABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mBarChartPreference = (BarChartPreference) screen.findPreference(getPreferenceKey());
+
+        final BarChartInfo info = new BarChartInfo.Builder()
+                .setTitle(R.string.permission_bar_chart_title)
+                .setDetails(R.string.permission_bar_chart_details)
+                .setEmptyText(R.string.permission_bar_chart_empty_text)
+                .setDetailsOnClickListener((View v) -> {
+                    final Intent intent = new Intent(Intent.ACTION_REVIEW_PERMISSION_USAGE);
+                    mContext.startActivity(intent);
+                })
+                .build();
+
+        mBarChartPreference.initializeBarChart(info);
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        retrievePermissionUsageData();
+    }
+
+    @Override
+    public void onPermissionUsageResult(@NonNull List<RuntimePermissionUsageInfo> usageInfos) {
+        usageInfos.sort(Comparator.comparingInt(
+                RuntimePermissionUsageInfo::getAppAccessCount).reversed());
+
+        // If the result is different, we need to update bar views.
+        if (!areSamePermissionGroups(usageInfos)) {
+            mBarChartPreference.setBarViewInfos(createBarViews(usageInfos));
+            mOldUsageInfos = usageInfos;
+        }
+    }
+
+    private void retrievePermissionUsageData() {
+        mContext.getSystemService(PermissionControllerManager.class).getPermissionUsages(
+                false /* countSystem */, (int) DAYS.toSeconds(1),
+                mContext.getMainExecutor() /* executor */, this /* callback */);
+    }
+
+    private BarViewInfo[] createBarViews(List<RuntimePermissionUsageInfo> usageInfos) {
+        if (usageInfos.isEmpty()) {
+            return null;
+        }
+
+        final BarViewInfo[] barViewInfos = new BarViewInfo[
+                Math.min(BarChartPreference.MAXIMUM_BAR_VIEWS, usageInfos.size())];
+
+        for (int index = 0; index < barViewInfos.length; index++) {
+            final RuntimePermissionUsageInfo permissionGroupInfo = usageInfos.get(index);
+
+            barViewInfos[index] = new BarViewInfo(
+                    getPermissionGroupIcon(permissionGroupInfo.getName()),
+                    permissionGroupInfo.getAppAccessCount(),
+                    R.string.storage_detail_apps);
+
+            // Set the click listener for each bar view.
+            // The listener will navigate user to permission usage app.
+            barViewInfos[index].setClickListener((View v) -> {
+                final Intent intent = new Intent(Intent.ACTION_REVIEW_PERMISSION_USAGE);
+                intent.putExtra(Intent.EXTRA_PERMISSION_GROUP_NAME, permissionGroupInfo.getName());
+                mContext.startActivity(intent);
+            });
+        }
+
+        return barViewInfos;
+    }
+
+    private Drawable getPermissionGroupIcon(CharSequence permissionGroup) {
+        Drawable icon = null;
+        try {
+            icon = mPackageManager.getPermissionGroupInfo(permissionGroup.toString(), 0)
+                    .loadIcon(mPackageManager);
+        } catch (PackageManager.NameNotFoundException e) {
+            Log.w(TAG, "Cannot find group icon for " + permissionGroup, e);
+        }
+
+        return icon;
+    }
+
+    private boolean areSamePermissionGroups(List<RuntimePermissionUsageInfo> newUsageInfos) {
+        if (newUsageInfos.size() != mOldUsageInfos.size()) {
+            return false;
+        }
+
+        for (int index = 0; index < newUsageInfos.size(); index++) {
+            final RuntimePermissionUsageInfo newInfo = newUsageInfos.get(index);
+            final RuntimePermissionUsageInfo oldInfo = mOldUsageInfos.get(index);
+
+            if (!newInfo.getName().equals(oldInfo.getName()) ||
+                    newInfo.getAppAccessCount() != oldInfo.getAppAccessCount()) {
+                return false;
+            }
+        }
+        return true;
+    }
+}