要在锁屏时打开活动，您可以使用带有“全屏意图”的高通知，如CommonsWare的答案所示。但是，为了获得更多详细信息，您可以尝试我的解决方案，如下所示：
创建一个前台服务，然后在onStartCommand方法中调用buildNotification，在buildNotification方法中返回放入startForeground方法参数的通知。
public class IncomingCallService extends Service {
public int onStartCommand(Intent intent, int flags, int startId) {
Notification notification = buildNotification();
startForeground(1, notification);
return START_NOT_STICKY;
}
}
在 buildNotification 方法中，我们将创建一个高优先级、调用类别和全屏意图的通知。
private Notification buildNotification() {
Intent fullScreenIntent = new Intent(this, IncomingCallActivity.class);
PendingIntent fullScreenPendingIntent = PendingIntent.getActivity(this, 0, fullScreenIntent, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_notification_icon)
.setContentTitle("Incoming call")
.setContentText("(919) 555-1234")
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setCategory(NotificationCompat.CATEGORY_CALL)
// Use a full-screen intent only for the highest-priority alerts where you
// have an associated activity that you would like to launch after the user
// interacts with the notification. Also, if your app targets Android 10
// or higher, you need to request the USE_FULL_SCREEN_INTENT permission in
// order for the platform to invoke this notification.
.setFullScreenIntent(fullScreenPendingIntent, true);
notificationBuilder.setAutoCancel(true);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
notificationManager.createNotificationChannel(new NotificationChannel("123", "123", NotificationManager.IMPORTANCE_HIGH));
notificationBuilder.setChannelId("123");
}
Notification incomingCallNotification = notificationBuilder.build();
return incomingCallNotification;
}
在 onStartCommand 中，添加一行代码发送 ACTION_CLOSE_SYSTEM_DIALOGS 广播动作。 这很重要，以便启动全屏待处理意图。
public int onStartCommand(Intent intent, int flags, int startId) {
Notification notification = buildNotification();
startForeground(1, notification);
sendBroadcast(new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
return START_NOT_STICKY;
}
创建全屏活动，该活动将显示在锁定屏幕上，然后您需要添加setShowWhenLocked和setTurnScreenOn以在锁定屏幕上显示。如果没有这样做，您的活动将显示在锁定屏幕后面。下面是我的示例。
public class IncomingCallActivity extends AppCompatActivity {
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_explore);
setShowWhenLocked(true);
setTurnScreenOn(true);
getWindow().addFlags(
WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
| WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
| WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON);
}
}
当您从逻辑上接收到电话时，现在必须启动IncomingCallService。
public void startCallService() {
Intent intent = new Intent(context, IncomingCallService.class);
startForegroundService(intent);
}
你必须在你的清单文件中声明以下活动、服务和一些权限，如下所示:
<uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<application
...>
<activity android:name=".IncomingCallActivity" />
<service
android:name=".IncomingCallService"
android:enabled="true"
android:exported="true" />
</application>
我在谷歌、三星和Vsmart手机上进行了测试，它们都正常工作。但对于小米设备，您需要按以下步骤启用一些权限：
- 长按您的应用图标
- 打开应用信息
- 点击“其他权限”选项
- 允许显示在锁定屏幕上
现在您的应用程序将在小米设备上工作。如果您在使用我的解决方案时遇到任何问题，请在此处留言。如果我能帮助您，我会尽力而为。
