Android 屏蔽锁屏界面上的通知显示

「爱情、让人受尽委屈。」 2024-03-23 13:03 57阅读 0赞

## 一. 前言 ##

**\[定制需求描述\]**:在插入SD后, 锁屏状态下， 去掉提示“SD卡可用于传输照片和媒体文件”

需求拆解: 要求正常显示在SystemUI下拉状态栏, 只需要屏蔽在锁屏状态下的通知.

## 二. 发送通知 ##

首先来找找这个字符串"可用于传输照片和媒体文件"

是在/frameworks/base/core/res/res/values-zh-rCN.xml 中

在源码中搜索引用该字符串的文件为:StorageNotification.java 路径为:

frameworks/base/packages/SystemUI/src/com/android/systemui/usb/StorageNotification.java

当插入SD后的逻辑代码为:

private void onVolumeStateChangedInternal(VolumeInfo vol) {
            switch (vol.getType()) {
                case VolumeInfo.TYPE_PRIVATE:
                    onPrivateVolumeStateChangedInternal(vol);
                    break;
                    //SD卡
                case VolumeInfo.TYPE_PUBLIC:
                    onPublicVolumeStateChangedInternal(vol);
                    break;
            }
        }

接下来, 待SD卡挂载成功后,就会走 onVolumeMounted(vol)方法

private Notification onVolumeMounted(VolumeInfo vol) {
    ....
    Notification.Builder builder = buildNotificationBuilder(vol, title, text)
    ....
    }

方法中,会创建通知builder对象

private Notification.Builder buildNotificationBuilder(VolumeInfo vol, CharSequence title,
                CharSequence text) {
            Notification.Builder builder =
                    new Notification.Builder(mContext, NotificationChannels.STORAGE)
                            .setSmallIcon(getSmallIcon(vol.getDisk(), vol.getState()))
                            .setColor(mContext.getColor(R.color.system_notification_accent_color))
                            .setContentTitle(title)
                            .setContentText(text)
                            .setStyle(new Notification.BigTextStyle().bigText(text))
                            .setVisibility(Notification.VISIBILITY_PUBLIC)
                            .setLocalOnly(true)
                            .extend(new Notification.TvExtender());
            overrideNotificationAppName(mContext, builder, false);
            return builder;
        }

接下来回到 onPublicVolumeStateChangedInternal中, 当builder创建成功后,接下来就是发送通知

private void onPublicVolumeStateChangedInternal(VolumeInfo vol) {
    ....
    mNotificationManager.notifyAsUser(vol.getId(), SystemMessage.NOTE_STORAGE_PUBLIC,
                        notif, UserHandle.of(vol.getMountUserId()));
    ....
    }

## 三. 显示通知 ##

熟悉SystemUI模块的开发人员, 可以直接看管理锁屏状态下通知显示的文件:

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/NotificationLockscreenUserManager.java 它是一个接口文件, 里面有这两个方法:

一个是通过userId 来过滤, 一个是字符串String key 来过滤隐藏通信

boolean shouldHideNotifications(int userId);
        boolean shouldHideNotifications(String key);

具体的实现文件为NotificationLockscreenUserManagerImpl.java文件

我是通过用key这个方法来过滤的

public boolean shouldHideNotifications(String key) {
            if (getEntryManager() == null) {
                Log.wtf(TAG, "mEntryManager was null!", new Throwable());
                return true;
            }
            return isLockscreenPublicMode(mCurrentUserId)
                    && getEntryManager().getNotificationData().getVisibilityOverride(key) ==
                            Notification.VISIBILITY_SECRET;
        }

通过全局搜索这个方法被调用的地方

![bc3bca6a128047b0ba0b92c0df21cff1.png][]

在NotificationFilter.java文件中的shouldFilterOut 方法中

/**
         * @return true if the provided notification should NOT be shown right now.
         */
        public boolean shouldFilterOut(NotificationEntry entry) {
            final StatusBarNotification sbn = entry.notification;
            if (!(getEnvironment().isDeviceProvisioned()
                    || showNotificationEvenIfUnprovisioned(sbn))) {
                return true;
            }
    
            if (!getEnvironment().isNotificationForCurrentProfiles(sbn)) {
                return true;
            }
    
            if (getUserManager().isLockscreenPublicMode(sbn.getUserId())
                    && (sbn.getNotification().visibility == Notification.VISIBILITY_SECRET
                            || getUserManager().shouldHideNotifications(sbn.getUserId())
                            || getUserManager().shouldHideNotifications(sbn.getKey()))) {
                return true;
            }
    ....
    
    }

这个方法表达的意思就是 在特定条件下过滤掉通知, 所以这样子就有解决方法了, 我们在这个方法中根据特定的判断条件,返回true,表示需要在锁屏界面上过滤掉这个通知显示.

## 四. 解决方案 ##

既然是通过key作为判断条件, 在发送通知的地方加上一个key相关的方法

private Notification.Builder buildNotificationBuilder(VolumeInfo vol, CharSequence title,
                CharSequence text) {
            Notification.Builder builder =
                    new Notification.Builder(mContext, NotificationChannels.STORAGE)
                            .setSmallIcon(getSmallIcon(vol.getDisk(), vol.getState()))
                            .setColor(mContext.getColor(R.color.system_notification_accent_color))
                            .setContentTitle(title)
                            .setContentText(text)
                            .setStyle(new Notification.BigTextStyle().bigText(text))
                            .setVisibility(Notification.VISIBILITY_PUBLIC)
                            .setLocalOnly(true)
                            //加上这个自定义的key  不需要显示在锁屏界面
                            .setGroup("not_show_on_lockscreen")
                            .extend(new Notification.TvExtender());
            overrideNotificationAppName(mContext, builder, false);
            return builder;
        }

然后在显示通知的过滤方法中,加入判断条件并返回true

public boolean shouldFilterOut(NotificationEntry entry) {
            final StatusBarNotification sbn = entry.notification;
            if (!(getEnvironment().isDeviceProvisioned()
                    || showNotificationEvenIfUnprovisioned(sbn))) {
                return true;
            }
            //在锁屏界面不显示SD卡的通知
            if ("not_show_on_lockscreen".equals(sbn.getGroupKey())) {
                return true;
            }
            //
       ....
    
       }

[bc3bca6a128047b0ba0b92c0df21cff1.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/23/af324de289304df09e24a679501b5e55.png