Android 11 sim卡来电不弹出悬浮通知，默认来电默认全屏

默认情况下，来电android是以通知窗口的形式显示，只在屏幕的顶部弹出一个悬浮通知，现在改为全屏显示，直接跳转来电界面InCallActivity

\packages\apps\Dialer\java\com\android\incallui\StatusBarNotifier.java

 /**
   * Helper method for updateInCallNotification() and updateNotification(): Update the phone app's
   * status bar notification based on the current telephony state, or cancels the notification if
   * the phone is totally idle.
   */
  private boolean firstShow = true;//add
  @RequiresPermission(Manifest.permission.READ_PHONE_STATE)
  private void updateInCallNotification() {
    LogUtil.d("StatusBarNotifier.updateInCallNotification", "");

    final DialerCall call = getCallToShow(CallList.getInstance());
    // don't show Notification, if call has already been rejected
    if (call != null && !call.isRejected()) {
      // add 当去电或者来电是会一直重复调用这个方法,要做一个判断，防止重复进入InCallActivity
      showNotification(call);
      if (firstShow) {
        context.startActivity(InCallActivity.getIntent(context, false/*showDialpad*/, false/*newOutgoingCall*/, true /* forFullScreen */));
        firstShow = false;
      }
      //add end
    } else {
      firstShow = true;//add
      cancelNotification();
    }
  }


Android 11 通知是否弹出，有两个因素决定，
一个是通知的优先级（setPriority(NotificationCompat.PRIORITY_MIN)），

另一个是通知渠道（通道）的优先级（NotificationManager.IMPORTANCE_HIGH）
public NotificationChannel(String id, CharSequence name, @Importance int importance) {
        this.mId = getTrimmedString(id);
        this.mName = name != null ? getTrimmedString(name.toString()) : null;
        this.mImportance = importance;
    }


\packages\apps\Dialer\java\com\android\dialer\notification\NotificationChannelManager.java
这是通话app 为通知渠道的管理和创建

private static void createIncomingCallChannel(@NonNull Context context) {
    NotificationChannel channel =
        new NotificationChannel(
            NotificationChannelId.INCOMING_CALL,
            context.getText(R.string.notification_channel_incoming_call),
            NotificationManager.IMPORTANCE_MAX);
    ......
  }
  

实际修改 :来电通知弹出悬浮 
/** Sets up the main Ui for the notification */
  @RequiresPermission(Manifest.permission.READ_PHONE_STATE)
  private void buildAndSendNotification(CallList callList, DialerCall originalCall, ContactCacheEntry contactInfo) {
    
   ...........
   switch (notificationType) {
      case NOTIFICATION_INCOMING_CALL:
        if (BuildCompat.isAtLeastO()) {
          builder.setChannelId(NotificationChannelId.ONGOING_CALL);// add old -> NotificationChannelId.INCOMING_CALL
        }
        ......
        }
        break;
      case NOTIFICATION_INCOMING_CALL_QUIET:
        if (BuildCompat.isAtLeastO()) {
          builder.setChannelId(NotificationChannelId.ONGOING_CALL);
        }
        break;

    ............
  }
  
按钮接听方式
修改位置
packages\apps\Dialer\java\com\android\incallui\answer\impl\answermethod\AnswerMethodFactory.java

@NonNull
  public static AnswerMethod createAnswerMethod(@NonNull Activity activity) {
    if (needTwoButton(activity)) {
      return new TwoButtonMethod();
    } else {
      //return new FlingUpDownMethod();
      return new TwoButtonMethod();//add 
    }
  }

参考1
参考2

其实通知和SystemUI 相关，也可以在它哪里拦截！！！

SystemIU关于悬浮通知
  modified:   packages/SystemUI/src/com/android/systemui/statusbar/notification/interruption/HeadsUpViewBinder.java
	modified:   packages/SystemUI/src/com/android/systemui/statusbar/notification/interruption/NotificationInterruptStateProviderImpl.java
	modified:   packages/SystemUI/src/com/android/systemui/statusbar/policy/HeadsUpManager.java
	
//HeadsUpManager.java
@Override
    protected void onAlertEntryAdded(AlertEntry alertEntry) {
        NotificationEntry entry = alertEntry.mEntry;
        if(entry.getSbn().getPackageName().equals("com.xx.xxx")){
            return;
        }
        entry.setHeadsUp(true);
        setEntryPinned((HeadsUpEntry) alertEntry, shouldHeadsUpBecomePinned(entry));
        for (OnHeadsUpChangedListener listener : mListeners) {
            listener.onHeadsUpStateChanged(entry, true);
        }
    }

参考3

在Frameworks层拦截Home键
https://blog.csdn.net/abc6368765/article/details/132164705

/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

/** {@inheritDoc} */
     @Override
     public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {
......
// First we always handle the home key here, so applications
         // can never break it, although if keyguard is on, we do let
         // it handle it, because that gives us the correct 5 second
         // timeout.
        if (keyCode == KeyEvent.KEYCODE_HOME) {

             // If we have released the home key, and didn't do anything else
             // while it was pressed, then it is time to go home!
             if (!down) {
                 //添加的判断当前前台运行APP代码
                 if (!isBackgroundActivity(mContext, PKG_NAME_xxxxx)) {
                         Log.d(TAG, "xxxx app is foreground");
                         if (!getTopActivity(mContext).equals(ACTIVITY_NAME_xxxx)) {
                                 Log.d(TAG, "xxxxx app is foreground activity");
                                 return -1;
                         }
                        return -1;
                 }

                 cancelPreloadRecentApps();

                 mHomePressed = false;
                 if (mHomeConsumed) {
                     mHomeConsumed = false;
                     return -1;
                 }
                 ......