Make a few custom slices implement CustomSliceable.

Bug: 80263568
Test: robotests, slice-browser
Change-Id: Id809a347d77448917154c2d1144fd2517e70829a

src/com/android/settings/flashlight/FlashlightSlice.java

@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2018 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.flashlight;
+
+import static android.app.slice.Slice.EXTRA_TOGGLE_STATE;
+
+import static androidx.slice.builders.ListBuilder.ICON_IMAGE;
+
+import android.annotation.ColorInt;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraManager;
+import android.net.Uri;
+import android.provider.Settings;
+import android.provider.Settings.Secure;
+import android.util.Log;
+
+import androidx.core.graphics.drawable.IconCompat;
+import androidx.slice.Slice;
+import androidx.slice.builders.ListBuilder;
+import androidx.slice.builders.ListBuilder.RowBuilder;
+import androidx.slice.builders.SliceAction;
+
+import com.android.settings.R;
+import com.android.settings.Utils;
+import com.android.settings.slices.CustomSliceRegistry;
+import com.android.settings.slices.CustomSliceable;
+
+
+/**
+ * Utility class to build a Flashlight Slice, and handle all associated actions.
+ */
+public class FlashlightSlice implements CustomSliceable {
+
+    private static final String TAG = "FlashlightSlice";
+
+    /**
+     * Action broadcasting a change on whether flashlight is on or off.
+     */
+    private static final String ACTION_FLASHLIGHT_CHANGED =
+            "com.android.settings.flashlight.action.FLASHLIGHT_CHANGED";
+
+    private final Context mContext;
+
+    public FlashlightSlice(Context context) {
+        mContext = context;
+    }
+
+    @Override
+    public Slice getSlice() {
+        if (!isFlashlightAvailable(mContext)) {
+            return null;
+        }
+        final PendingIntent toggleAction = getBroadcastIntent(mContext);
+        @ColorInt final int color = Utils.getColorAccentDefaultColor(mContext);
+        final IconCompat icon =
+                IconCompat.createWithResource(mContext, R.drawable.ic_signal_flashlight);
+        return new ListBuilder(mContext, CustomSliceRegistry.FLASHLIGHT_SLICE_URI,
+                ListBuilder.INFINITY)
+                .setAccentColor(color)
+                .addRow(new RowBuilder()
+                        .setTitle(mContext.getText(R.string.power_flashlight))
+                        .setTitleItem(icon, ICON_IMAGE)
+                        .setPrimaryAction(
+                                SliceAction.createToggle(toggleAction, null,
+                                        isFlashlightEnabled(mContext))))
+                .build();
+    }
+
+    @Override
+    public Uri getUri() {
+        return CustomSliceRegistry.FLASHLIGHT_SLICE_URI;
+    }
+
+    @Override
+    public IntentFilter getIntentFilter() {
+        return new IntentFilter(ACTION_FLASHLIGHT_CHANGED);
+    }
+
+    @Override
+    public void onNotifyChange(Intent intent) {
+        try {
+            final String cameraId = getCameraId(mContext);
+            if (cameraId != null) {
+                final boolean state = intent.getBooleanExtra(
+                        EXTRA_TOGGLE_STATE, isFlashlightEnabled(mContext));
+                final CameraManager cameraManager = mContext.getSystemService(CameraManager.class);
+                cameraManager.setTorchMode(cameraId, state);
+            }
+        } catch (CameraAccessException e) {
+            Log.e(TAG, "Camera couldn't set torch mode.", e);
+        }
+        mContext.getContentResolver().notifyChange(CustomSliceRegistry.FLASHLIGHT_SLICE_URI, null);
+    }
+
+    @Override
+    public Intent getIntent() {
+        return null;
+    }
+
+    private static String getCameraId(Context context) throws CameraAccessException {
+        final CameraManager cameraManager = context.getSystemService(CameraManager.class);
+        final String[] ids = cameraManager.getCameraIdList();
+        for (String id : ids) {
+            CameraCharacteristics c = cameraManager.getCameraCharacteristics(id);
+            Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
+            Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING);
+            if (flashAvailable != null && flashAvailable
+                    && lensFacing != null && lensFacing == CameraCharacteristics.LENS_FACING_BACK) {
+                return id;
+            }
+        }
+        return null;
+    }
+
+
+    private static boolean isFlashlightAvailable(Context context) {
+        return Settings.Secure.getInt(
+                context.getContentResolver(), Secure.FLASHLIGHT_AVAILABLE, 0) == 1;
+    }
+
+    private static boolean isFlashlightEnabled(Context context) {
+        return Settings.Secure.getInt(
+                context.getContentResolver(), Secure.FLASHLIGHT_ENABLED, 0) == 1;
+    }
+}