Add a confirmation dialog when forgetting BT device

This adds a confirmation dialog for when you hit the "Forget" button to
unpair with a device from the Bluetooth device details page.

Bug: 37955181
Test: make RunSettingsRoboTests
Change-Id: I7643ed09bf363c48078d6de8a47583bf91fc7729

src/com/android/settings/bluetooth/BluetoothDetailsButtonsController.java

@@ -43,14 +43,19 @@ public class BluetoothDetailsButtonsController extends BluetoothDetailsControlle
         mIsConnected = device.isConnected();
     }
 
+    private void onForgetButtonPressed() {
+        ForgetDeviceDialogFragment fragment =
+                ForgetDeviceDialogFragment.newInstance(mCachedDevice.getAddress());
+        fragment.show(mFragment.getFragmentManager(), ForgetDeviceDialogFragment.TAG);
+    }
+
     @Override
     protected void init(PreferenceScreen screen) {
         mActionButtons = (LayoutPreference) screen.findPreference(getPreferenceKey());
         Button rightButton = (Button) mActionButtons.findViewById(R.id.right_button);
         rightButton.setText(R.string.forget);
         rightButton.setOnClickListener((view) -> {
-            mCachedDevice.unpair();
-            mFragment.getActivity().finish();
+            onForgetButtonPressed();
         });
     }
 

src/com/android/settings/bluetooth/ForgetDeviceDialogFragment.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2017 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.bluetooth;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.bluetooth.BluetoothDevice;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.Bundle;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.logging.nano.MetricsProto;
+import com.android.settings.R;
+import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
+import com.android.settingslib.bluetooth.CachedBluetoothDevice;
+import com.android.settingslib.bluetooth.LocalBluetoothManager;
+
+/** Implements an AlertDialog for confirming that a user wishes to unpair or "forget" a paired
+ *  device*/
+public class ForgetDeviceDialogFragment extends InstrumentedDialogFragment {
+    public static final String TAG = "ForgetBluetoothDevice";
+    private static final String KEY_DEVICE_ADDRESS = "device_address";
+
+    private CachedBluetoothDevice mDevice;
+
+    public static ForgetDeviceDialogFragment newInstance(String deviceAddress) {
+        Bundle args = new Bundle(1);
+        args.putString(KEY_DEVICE_ADDRESS, deviceAddress);
+        ForgetDeviceDialogFragment dialog = new ForgetDeviceDialogFragment();
+        dialog.setArguments(args);
+        return dialog;
+    }
+
+    @VisibleForTesting
+    CachedBluetoothDevice getDevice(Context context) {
+        String deviceAddress = getArguments().getString(KEY_DEVICE_ADDRESS);
+        LocalBluetoothManager manager = Utils.getLocalBtManager(context);
+        BluetoothDevice device = manager.getBluetoothAdapter().getRemoteDevice(deviceAddress);
+        return manager.getCachedDeviceManager().findDevice(device);
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsProto.MetricsEvent.DIALOG_BLUETOOTH_PAIRED_DEVICE_FORGET;
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle inState) {
+        DialogInterface.OnClickListener onConfirm = (dialog, which) -> {
+            mDevice.unpair();
+            Activity activity = getActivity();
+            if (activity != null) {
+                activity.finish();
+            }
+        };
+        Context context = getContext();
+        mDevice = getDevice(context);
+        AlertDialog dialog = new AlertDialog.Builder(context)
+                .setPositiveButton(R.string.bluetooth_unpair_dialog_forget_confirm_button,
+                        onConfirm)
+                .setNegativeButton(android.R.string.cancel, null)
+                .create();
+        dialog.setTitle(R.string.bluetooth_unpair_dialog_title);
+        dialog.setMessage(context.getString(R.string.bluetooth_unpair_dialog_body,
+                mDevice.getName()));
+        return dialog;
+    }
+}