Reworks lock screen flows.

This also adds frp warning dialogs in case the user skips lock
screen setup initially.

bug:26880444
Change-Id: I732b6a806e139fb6c1c1b334b8d1608c229f217c

src/com/android/settings/fingerprint/SetupSkipDialog.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2016 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.fingerprint;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.app.FragmentManager;
+import android.content.DialogInterface;
+import android.os.Build.VERSION;
+import android.os.Build.VERSION_CODES;
+import android.os.Bundle;
+import android.os.Handler;
+import android.support.annotation.NonNull;
+import android.view.View;
+import android.view.Window;
+import android.view.WindowManager;
+
+import com.android.settings.R;
+import com.android.setupwizardlib.util.SystemBarHelper;
+
+public class SetupSkipDialog extends DialogFragment implements DialogInterface.OnClickListener {
+
+    public static final String EXTRA_FRP_SUPPORTED = ":settings:frp_supported";
+
+    private static final String ARG_FRP_SUPPORTED = "frp_supported";
+    private static final String TAG_SKIP_DIALOG = "skip_dialog";
+    private static final int RESULT_SKIP = Activity.RESULT_FIRST_USER + 10;
+
+    public static SetupSkipDialog newInstance(boolean isFrpSupported) {
+        SetupSkipDialog dialog = new SetupSkipDialog();
+        Bundle args = new Bundle();
+        args.putBoolean(ARG_FRP_SUPPORTED, isFrpSupported);
+        dialog.setArguments(args);
+        return dialog;
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final AlertDialog dialog = onCreateDialogBuilder().create();
+        // hide system status bar.
+        SystemBarHelper.hideSystemBars(dialog);
+        return dialog;
+    }
+
+    @NonNull
+    public AlertDialog.Builder onCreateDialogBuilder() {
+        Bundle args = getArguments();
+        return new AlertDialog.Builder(getContext())
+                .setPositiveButton(R.string.skip_anyway_button_label, this)
+                .setNegativeButton(R.string.go_back_button_label, this)
+                .setMessage(args.getBoolean(ARG_FRP_SUPPORTED) ?
+                        R.string.lock_screen_intro_skip_dialog_text_frp :
+                        R.string.lock_screen_intro_skip_dialog_text);
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int button) {
+        switch (button) {
+            case DialogInterface.BUTTON_POSITIVE:
+                Activity activity = getActivity();
+                activity.setResult(RESULT_SKIP);
+                activity.finish();
+                break;
+        }
+    }
+
+    public void show(FragmentManager manager) {
+        show(manager, TAG_SKIP_DIALOG);
+    }
+}