SetupWizard: Add device specific hook page

* Add a new activity DeviceSpecificActivity which acts as a jumppad
  into an activity using "org.lineageos.settings.device.SUW_SETTINGS"
  * Handles navigation (back / next)
  * Handles cases where the script contains the page but SUW_SETTINGS
    don't exist
* In order to use this, devices need to provide an activity that:
  * at least shows a back and continue button
  * returns Activity.RESULT_OK and Activity.RESULT_CANCELLED for the
    buttons
  * does whatever you need to specifically have done in setup!

Change-Id: I4956c8f5f1ad13b9adf2e5604fd4a728e261336b
diff --git a/src/org/lineageos/setupwizard/DeviceSpecificActivity.java b/src/org/lineageos/setupwizard/DeviceSpecificActivity.java
new file mode 100644
index 0000000..9c12e95
--- /dev/null
+++ b/src/org/lineageos/setupwizard/DeviceSpecificActivity.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2021 The LineageOS 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 org.lineageos.setupwizard;
+
+import android.app.Activity;
+import android.content.ComponentName;
+import android.content.Intent;
+import android.os.Bundle;
+
+import com.google.android.setupcompat.util.WizardManagerHelper;
+
+import org.lineageos.setupwizard.util.SetupWizardUtils;
+
+public class DeviceSpecificActivity extends BaseSetupWizardActivity {
+
+    private static final String ACTION_SETUP_DEVICE = "org.lineageos.settings.device.SUW_SETTINGS";
+    private static final int REQUEST_CODE_SETUP_DEVICE = 90000;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        onStartSubactivity();
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == REQUEST_CODE_SETUP_DEVICE) {
+            if (resultCode == RESULT_OK) {
+                goToNextPage();
+            } else {
+                finish();
+            }
+        } else if (resultCode == RESULT_CANCELED) {
+            onStartSubactivity();
+            applyBackwardTransition(TRANSITION_ID_NONE);
+        }
+    }
+
+    @Override
+    protected int getLayoutResId() {
+        return R.layout.setup_device_specific;
+    }
+
+    private void onStartSubactivity() {
+        Intent intent = new Intent(ACTION_SETUP_DEVICE);
+        ComponentName name = intent.resolveActivity(getPackageManager());
+        if (name != null) {
+            applyForwardTransition(TRANSITION_ID_SLIDE);
+            startActivityForResult(intent, REQUEST_CODE_SETUP_DEVICE);
+        } else {
+            SetupWizardUtils.disableComponent(this, DeviceSpecificActivity.class);
+            goToNextPage();
+            finish();
+        }
+    }
+
+    private void goToNextPage() {
+        applyForwardTransition(TRANSITION_ID_SLIDE);
+        Intent intent = WizardManagerHelper.getNextIntent(getIntent(), Activity.RESULT_OK);
+        nextAction(NEXT_REQUEST, intent);
+    }
+}