Refactor Utils.startWithFragment to SubSettingLauncher

- Use the new launcher in AccountTypePrefernce for now. Will migrate the
  rest in follow up CLs.

Change-Id: I67aa49f54b39ecea4ecfdc32ccbd827d21fc79b8
Bug: 73250851
Test: robotest

src/com/android/settings/core/SubSettingLauncher.java

@@ -0,0 +1,160 @@
+/*
+ * 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.core;
+
+import android.annotation.StringRes;
+import android.app.Fragment;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.UserHandle;
+import android.support.annotation.VisibleForTesting;
+
+import com.android.settings.SettingsActivity;
+import com.android.settings.SubSettings;
+import com.android.settingslib.core.instrumentation.VisibilityLoggerMixin;
+
+public class SubSettingLauncher {
+
+    private final Context mContext;
+    private final LaunchRequest mLaunchRequest;
+    private boolean mLaunched;
+
+    public SubSettingLauncher(Context context) {
+        if (context == null) {
+            throw new IllegalArgumentException("Context must be non-null.");
+        }
+        mContext = context;
+        mLaunchRequest = new LaunchRequest();
+    }
+
+    public SubSettingLauncher setDestination(String fragmentName) {
+        mLaunchRequest.destinationName = fragmentName;
+        return this;
+    }
+
+    public SubSettingLauncher setTitle(@StringRes int titleResId) {
+        return setTitle(null /*titlePackageName*/, titleResId);
+    }
+
+    public SubSettingLauncher setTitle(String titlePackageName, @StringRes int titleResId) {
+        mLaunchRequest.titleResPackageName = titlePackageName;
+        mLaunchRequest.titleResId = titleResId;
+        mLaunchRequest.title = null;
+        return this;
+    }
+
+    public SubSettingLauncher setTitle(CharSequence title) {
+        mLaunchRequest.title = title;
+        return this;
+    }
+
+    public SubSettingLauncher setIsShortCut(boolean isShortCut) {
+        mLaunchRequest.isShortCut = isShortCut;
+        return this;
+    }
+
+    public SubSettingLauncher setArguments(Bundle arguments) {
+        mLaunchRequest.arguments = arguments;
+        return this;
+    }
+
+    public SubSettingLauncher setSourceMetricsCategory(int sourceMetricsCategory) {
+        mLaunchRequest.sourceMetricsCategory = sourceMetricsCategory;
+        return this;
+    }
+
+    public SubSettingLauncher setResultListener(Fragment listener, int resultRequestCode) {
+        mLaunchRequest.mRequestCode = resultRequestCode;
+        mLaunchRequest.mResultListener = listener;
+        return this;
+    }
+
+    public SubSettingLauncher addFlags(int flags) {
+        mLaunchRequest.flags |= flags;
+        return this;
+    }
+
+    public SubSettingLauncher setUserHandle(UserHandle userHandle) {
+        mLaunchRequest.userHandle = userHandle;
+        return this;
+    }
+
+    public void launch() {
+        if (mLaunched) {
+            throw new IllegalStateException(
+                    "This launcher has already been executed. Do not reuse");
+        }
+        mLaunched = true;
+        final Intent intent = new Intent(Intent.ACTION_MAIN);
+        intent.setClass(mContext, SubSettings.class);
+
+        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT, mLaunchRequest.destinationName);
+        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_ARGUMENTS, mLaunchRequest.arguments);
+        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE_RES_PACKAGE_NAME,
+                mLaunchRequest.titleResPackageName);
+        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE_RESID,
+                mLaunchRequest.titleResId);
+        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_TITLE, mLaunchRequest.title);
+        intent.putExtra(SettingsActivity.EXTRA_SHOW_FRAGMENT_AS_SHORTCUT,
+                mLaunchRequest.isShortCut);
+        intent.putExtra(VisibilityLoggerMixin.EXTRA_SOURCE_METRICS_CATEGORY,
+                mLaunchRequest.sourceMetricsCategory);
+        intent.addFlags(mLaunchRequest.flags);
+
+        if (mLaunchRequest.userHandle != null
+                && mLaunchRequest.userHandle.getIdentifier() != UserHandle.myUserId()) {
+            launchAsUser(mContext, intent, mLaunchRequest.userHandle);
+        } else if (mLaunchRequest.mResultListener != null) {
+            launchForResult(mLaunchRequest.mResultListener, intent, mLaunchRequest.mRequestCode);
+        } else {
+            launch(intent);
+        }
+    }
+
+    @VisibleForTesting
+    void launch(Intent intent) {
+        mContext.startActivity(intent);
+    }
+
+    private static void launchForResult(Fragment listener, Intent intent, int requestCode) {
+        listener.getActivity().startActivityForResult(intent, requestCode);
+    }
+
+    private static void launchAsUser(Context context, Intent intent, UserHandle userHandle) {
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
+        context.startActivityAsUser(intent, userHandle);
+    }
+
+    /**
+     * Simple container that has information about how to launch a subsetting.
+     */
+    static class LaunchRequest {
+        String destinationName;
+        int titleResId;
+        String titleResPackageName;
+        CharSequence title;
+        boolean isShortCut;
+        int sourceMetricsCategory;
+        int flags;
+        Fragment mResultListener;
+        int mRequestCode;
+        UserHandle userHandle;
+        Bundle arguments;
+    }
+}