Add a setting to overrid emergency number for Emergency SOS

- Add a dialog preference and custom dialog to allow user input a phone
  number
- Use settingslib/emergencynumber util to set/get the user input into
  SettingsProvider

https://screenshot.googleplex.com/A9GmJrcSbp4jYfd.png

Bug: 172609395
Test: robotests
Change-Id: Iedd9bb9f32c212a310fd8fddffad852a997f3b0d

src/com/android/settings/gestures/EmergencyGestureNumberOverridePreference.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2020 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.gestures;
+
+import static android.content.DialogInterface.BUTTON_POSITIVE;
+
+import android.content.Context;
+import android.content.DialogInterface;
+import android.provider.Settings;
+import android.text.TextUtils;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.EditText;
+
+import androidx.annotation.VisibleForTesting;
+
+import com.android.settings.R;
+import com.android.settingslib.CustomDialogPreferenceCompat;
+import com.android.settingslib.emergencynumber.EmergencyNumberUtils;
+
+/**
+ * A dialog preference allowing user to provide a phone number to call during emergency gesture.
+ */
+public class EmergencyGestureNumberOverridePreference extends
+        CustomDialogPreferenceCompat {
+    private static final String TAG = "EmergencyGestureNumberO";
+    @VisibleForTesting
+    EditText mEditText;
+
+    private EmergencyNumberUtils mEmergencyNumberUtils;
+
+    public EmergencyGestureNumberOverridePreference(Context context,
+            AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        init(context);
+    }
+
+    public EmergencyGestureNumberOverridePreference(Context context, AttributeSet attrs,
+            int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init(context);
+    }
+
+    public EmergencyGestureNumberOverridePreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    public EmergencyGestureNumberOverridePreference(Context context) {
+        super(context);
+        init(context);
+    }
+
+    private void init(Context context) {
+        mEmergencyNumberUtils = new EmergencyNumberUtils(context);
+    }
+
+    @Override
+    public void setNegativeButtonText(int negativeButtonTextResId) {
+        super.setNegativeButtonText(negativeButtonTextResId);
+    }
+
+    @Override
+    protected void onBindDialogView(View view) {
+        super.onBindDialogView(view);
+        mEditText = view.findViewById(R.id.emergency_gesture_number_override);
+        final String defaultNumber = mEmergencyNumberUtils.getDefaultPoliceNumber();
+        mEditText.setHint(defaultNumber);
+        final String number = mEmergencyNumberUtils.getPoliceNumber();
+        if (!TextUtils.equals(number, defaultNumber)) {
+            mEditText.setText(number);
+        }
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        if (which == BUTTON_POSITIVE) {
+            final String input = mEditText.getText().toString();
+            if (!TextUtils.isEmpty(input)) {
+                Settings.Secure.putString(getContext().getContentResolver(),
+                        Settings.Secure.EMERGENCY_GESTURE_CALL_NUMBER, input);
+            } else {
+                Settings.Secure.putString(getContext().getContentResolver(),
+                        Settings.Secure.EMERGENCY_GESTURE_CALL_NUMBER,
+                        mEmergencyNumberUtils.getDefaultPoliceNumber());
+            }
+        }
+    }
+}