Add Transcode Settings screen in Developer Options

This screen would be used to enable/disable transcoding for all apps, and select a list of apps to be skipped from transcoding.
UI screenshot: https://screenshot.googleplex.com/4bpbZdM6vbhdw5u

Design doc reference for native transcoding: go/seamless-transcoding

Test: Manual
Bug: 169547037
Change-Id: I7cf72131560b99728083838bf0dad400bb5cb4a9

src/com/android/settings/development/transcode/TranscodeGlobalTogglePreferenceController.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2020 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.transcode;
+
+import android.content.Context;
+import android.os.SystemProperties;
+
+import com.android.settings.core.TogglePreferenceController;
+
+/**
+ * The controller for the "Enable transcode for all apps" switch on the transcode settings
+ * screen.
+ */
+public class TranscodeGlobalTogglePreferenceController extends TogglePreferenceController {
+
+    private static final String TRANSCODE_ENABLED_PROP_KEY = "persist.sys.fuse.transcode";
+
+    public TranscodeGlobalTogglePreferenceController(Context context,
+            String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return SystemProperties.getBoolean(TRANSCODE_ENABLED_PROP_KEY, false);
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        SystemProperties.set(TRANSCODE_ENABLED_PROP_KEY, String.valueOf(isChecked));
+        return true;
+    }
+}

src/com/android/settings/development/transcode/TranscodeSettingsFragment.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2020 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.transcode;
+
+import android.app.settings.SettingsEnums;
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settingslib.development.DevelopmentSettingsEnabler;
+import com.android.settingslib.search.SearchIndexable;
+
+/**
+ * Fragment for native transcode settings in Developer options.
+ */
+@SearchIndexable
+public class TranscodeSettingsFragment extends DashboardFragment {
+    private static final String TAG = "TranscodeSettings";
+
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.transcode_settings;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.TRANSCODE_SETTINGS;
+    }
+
+    public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider(R.xml.transcode_settings) {
+
+                @Override
+                protected boolean isPageSearchEnabled(Context context) {
+                    return DevelopmentSettingsEnabler.isDevelopmentSettingsEnabled(context);
+                }
+            };
+}

src/com/android/settings/development/transcode/TranscodeSkipAppsPreferenceController.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2020 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.transcode;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.os.SystemProperties;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.core.BasePreferenceController;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * The controller for the "Skip transcoding for apps" section on the transcode settings
+ * screen.
+ */
+public class TranscodeSkipAppsPreferenceController extends BasePreferenceController implements
+        Preference.OnPreferenceChangeListener {
+
+    private static final String SKIP_SELECTED_APPS_PROP_KEY =
+            "persist.sys.fuse.transcode_skip_uids";
+
+    private final PackageManager mPackageManager;
+    private final List<String> mUidsToSkip = new ArrayList<>();
+
+    public TranscodeSkipAppsPreferenceController(Context context,
+            String preferenceKey) {
+        super(context, preferenceKey);
+        mPackageManager = context.getPackageManager();
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final Context context = screen.getContext();
+        mUidsToSkip.addAll(Arrays.asList(
+                SystemProperties.get(SKIP_SELECTED_APPS_PROP_KEY).split(",")));
+        Intent launcherIntent = new Intent(Intent.ACTION_MAIN);
+        launcherIntent.addCategory(Intent.CATEGORY_LAUNCHER);
+        List<ResolveInfo> apps = mPackageManager.queryIntentActivities(launcherIntent, 0);
+        for (ResolveInfo app : apps) {
+            String uid = String.valueOf(app.activityInfo.applicationInfo.uid);
+            SwitchPreference preference = new SwitchPreference(context);
+            preference.setTitle(app.loadLabel(mPackageManager));
+            preference.setIcon(app.loadIcon(mPackageManager));
+            preference.setKey(uid);
+            preference.setChecked(isSkippedForTranscoding(uid));
+            preference.setOnPreferenceChangeListener(this);
+
+            screen.addPreference(preference);
+        }
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object o) {
+        boolean value = (Boolean) o;
+        String uidStr = preference.getKey();
+        if (value) {
+            mUidsToSkip.add(uidStr);
+        } else {
+            mUidsToSkip.remove(uidStr);
+        }
+        SystemProperties.set(SKIP_SELECTED_APPS_PROP_KEY, String.join(",", mUidsToSkip));
+        return true;
+    }
+
+    private boolean isSkippedForTranscoding(String uid) {
+        return mUidsToSkip.contains(uid);
+    }
+}