Merge "Update InCallService API docs."

     * The name of the dialer role.

     *

     * @see Intent#ACTION_DIAL

     * @see android.telecom.InCallService

     */

    public static final String ROLE_DIALER = "android.app.role.DIALER";

import android.annotation.SdkConstant;

import android.annotation.SystemApi;

import android.app.Service;

import android.app.UiModeManager;

import android.bluetooth.BluetoothDevice;

import android.content.Intent;

import android.hardware.camera2.CameraManager;

 * phone calls.

 * <h2>Becoming the Default Phone App</h2>

 * The default dialer/phone app is one which provides the in-call user interface while the device is

 * in a call.  A device is bundled with a system provided default dialer/phone app.  The user may

 * choose a single app to take over this role from the system app.  An app which wishes to fulfill

 * one this role uses the {@code android.app.role.RoleManager} to request that they fill the role.

 * <p>

 * An app filling the role of the default phone app provides a user interface while the device is in

 * a call, and the device is not in car mode.

 * in a call.  It also provides the user with a means to initiate calls and see a history of calls

 * on their device.  A device is bundled with a system provided default dialer/phone app.  The user

 * may choose a single app to take over this role from the system app.  An app which wishes to

 * fulfill one this role uses the {@link android.app.role.RoleManager} to request that they fill the

 * {@link android.app.role.RoleManager#ROLE_DIALER} role.

 * <p>

 * The default phone app provides a user interface while the device is in a call, and the device is

 * not in car mode (i.e. {@link UiModeManager#getCurrentModeType()} is not

 * {@link android.content.res.Configuration#UI_MODE_TYPE_CAR}).

 * <p>

 * In order to fill the {@link android.app.role.RoleManager#ROLE_DIALER} role, an app must meet a

 * number of requirements:

 * <ul>

 *     <li>It must handle the {@link Intent#ACTION_DIAL} intent.  This means the app must provide

 *     a dial pad UI for the user to initiate outgoing calls.</li>

 *     <li>It must fully implement the {@link InCallService} API and provide both an incoming call

 *     UI, as well as an ongoing call UI.</li>

 * </ul>

 * <p>

 * Note: If the app filling the {@link android.app.role.RoleManager#ROLE_DIALER} crashes during

 * {@link InCallService} binding, the Telecom framework will automatically fall back to using the

 * dialer app pre-loaded on the device.  The system will display a notification to the user to let

 * them know that the app has crashed and that their call was continued using the pre-loaded dialer

 * app.

 * <p>

 * Further, the pre-loaded dialer will ALWAYS be used when the user places an emergency call.

 * <p>

 * Below is an example manifest registration for an {@code InCallService}. The meta-data

 * {@link TelecomManager#METADATA_IN_CALL_SERVICE_UI} indicates that this particular

 *           <action android:name="android.intent.action.DIAL" />

 *           <category android:name="android.intent.category.DEFAULT" />

 *      </intent-filter>

 *      <intent-filter>

 *           <action android:name="android.intent.action.DIAL" />

 *           <category android:name="android.intent.category.DEFAULT" />

 *           <data android:scheme="tel" />

 *      </intent-filter>

 * </activity>

 * }

 * </pre>

 *         }

 *     }

 * }

 * }

 * </pre>

 * <p id="incomingCallNotification">

 * <h3>Showing the Incoming Call Notification</h3>