前言
最近在使用Pixel3测试时在Android10的系统上遇到一些疑难问题, 在此跟大家分享一下
1. Android 10 (Q)无法接收UDP广播包的问题
在Android10上, App默认是没有接收UDP广播包的权限的, 导致一些搜索功能不可用, 具体的解决方案 需要申请MulticastLock才可以接收广播包, 代码如下:
//获取
WifiManager wifiManager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
//需要在AndroidManifest申请 CHANGE_WIFI_MULTICAST_STATE 权限, 该权限为非敏感权限, 不用动态申请
multiCastLock = wifiManager.createMulticastLock("nulticase_lock");
//请求Lock, 注意运行时只能请求一个, 反复申请会报错, 获取之后就能接收广播了
multiCastLock.acquire();
//不再接收广播的时候需要释放lock
multiCastLock.release();
2. Android 10 (Q) App在后台无法触发振动
当手机处于后台时, 调用振动的代码无效, 调用的代码为:
Vibrator mVibrator = (Vibrator) App.getInstance().getSystemService(Context.VIBRATOR_SERVICE);
long[] pattern = {100, 1000, 100, 1000};
mVibrator.vibrate(pattern, 2);
此时看logcat上的打印为:
E/VibratorService: Ignoring incoming vibration as process with uid = 10323 is background, usage = USAGE_UNKNOWN
在工程全局搜索可找到如下源码:
//package com.android.server;
//VibratorService.java
//只摘取了部分源码
Vibration vib = new Vibration(token, effect, usageHint, uid, opPkg, reason);
if (mProcStatesCache.get(uid, ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND)
> ActivityManager.PROCESS_STATE_IMPORTANT_FOREGROUND
&& !vib.isNotification() && !vib.isRingtone() && !vib.isAlarm()) {
Slog.e(TAG, "Ignoring incoming vibration as process with"
+ " uid = " + uid + " is background,"
+ " usage = " + AudioAttributes.usageToString(vib.usageHint));
return;
}
public boolean isNotification() {
return VibratorService.this.isNotification(usageHint);
}
public boolean isRingtone() {
return VibratorService.this.isRingtone(usageHint);
}
public boolean isAlarm() {
return VibratorService.this.isAlarm(usageHint);
}
public boolean isAlarm() {
return VibratorService.this.isAlarm(usageHint);
}
private static boolean isNotification(int usageHint) {
switch (usageHint) {
case AudioAttributes.USAGE_NOTIFICATION:
case AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_REQUEST:
case AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_INSTANT:
case AudioAttributes.USAGE_NOTIFICATION_COMMUNICATION_DELAYED:
return true;
default:
return false;
}
}
private static boolean isRingtone(int usageHint) {
return usageHint == AudioAttributes.USAGE_NOTIFICATION_RINGTONE;
}
private static boolean isAlarm(int usageHint) {
return usageHint == AudioAttributes.USAGE_ALARM;
}
由源码可知, 当App处于后台时且AudioAttributes不是Notification、Ringtone或者Alarm时, 请求振动的操作会被拒绝, 首先App在后台, 所以mProcStatesCache.get() 这个判断必然为ture, 那处理方案需要从usageHint来解决
通过查看mVibrator.vibrate()的参数会发现, 有一个构造方法为
public void vibrate(long[] pattern, int repeat, AudioAttributes attributes)
正好可以传入一个AudioAttributes, 故该问题解决方案如下:
Vibrator mVibrator = (Vibrator) App.getInstance().getSystemService(Context.VIBRATOR_SERVICE);
long[] pattern = {100, 1000, 100, 1000};
AudioAttributes audioAttributes = new AudioAttributes.Builder()
.setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
.setUsage(AudioAttributes.USAGE_ALARM) // 源码中isAlarm判断可通过
.build();
mVibrator.vibrate(pattern, 2);
3. Android 10 (Q) 弹出通知栏, 振动无效
在Android 10上, 通过NotificationManager.notify()弹出一个通知栏, 虽然设置了振动, 但是没有效果, 查看Logcat有以下打印
E/VibratorService: Ignoring incoming vibration as process with uid = 10323 is background, usage = USAGE_UNKNOWN
一模一样的错误日志, 由此可知在设置振动时, 没有设置AudioAttributes,解决方法在设置AudioAttributes时将其设置为Alarm即可,代码如下:
//AudioAttributes需要通过setSound来设置
//创建默认铃声, 也可以设置自定义铃声
Uri uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID,
CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
notificationChannel.enableVibration(true); //启用振动
AudioAttributes audioAttributes = new AudioAttributes.Builder()
.setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
.setUsage(AudioAttributes.USAGE_ALARM) //关键的一行, 设置AudioAttributes为Alarm
.build();
notificationChannel.setSound(uri, audioAttributes);
notifyManager.createNotificationChannel(notificationChannel);
结语
以上是我在适配中的总结,希望对大家的适配有所帮助,若有错误,敬请斧正。