notification.addAction 时icon不显示
时间: 2023-12-20 18:07:05 浏览: 376
如果您使用 `notification.addAction()` 方法添加操作按钮时,图标不显示的话,可能是因为您没有设置图标。在Android中,当您添加操作按钮时,需要为每个操作按钮设置一个图标。以下是解决该问题的步骤:
1. 在 `res` 目录下创建一个 `drawable` 目录,并在其中添加您想要显示的图标。例如,将图标命名为 `action_icon.png`。
2. 使用 `BitmapFactory.decodeResource()` 方法加载该图标,并将其分配给操作按钮。在以下示例中,我们使用 `R.drawable.action_icon` 来指定图标资源的ID。
```
// 创建一个操作按钮,并设置标题和图标
NotificationCompat.Action action = new NotificationCompat.Action.Builder(
R.drawable.action_icon, "Action Title", pendingIntent).build();
// 将操作按钮添加到通知中
builder.addAction(action);
```
通过上述步骤,您就可以为操作按钮设置图标,并在通知中显示它们了。如果您仍然遇到问题,请检查图标文件是否正确放置,并确保在 `addAction()` 方法中设置了正确的图标资源ID。
相关问题
Notification notification = new NotificationCompat.Builder(this, "com.example.myapplication") .setSmallIcon(R.drawable.ic_launcher_background) .setContentTitle("My notification") .setContentText("Hello World!") .addAction(R.drawable.ic_launcher_foreground, "Delete", pendingDeleteIntent) .build(); NotificationManagerCompat.from(this).notify(CHANNEL_CHARGING_NOTIFICATION_ID, notification); No Channel found for pkg=com.example.myapplication
这个错误提示是因为在 Android O 及更高版本中,创建通知时必须指定通知渠道。如果没有为通知指定渠道,则会出现“无法找到渠道”的错误。
您需要在创建通知之前创建一个通知渠道,并将其与通知相关联。以下是一个示例:
```
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
// Create the NotificationChannel
CharSequence name = "My App Notification Channel";
String description = "My App Notifications";
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel("com.example.myapplication", name, importance);
channel.setDescription(description);
// Register the channel with the system; you can't change the importance
// or other notification behaviors after this
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
// Create the notification and set the channel ID
Notification notification = new NotificationCompat.Builder(this, "com.example.myapplication")
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentTitle("My notification")
.setContentText("Hello World!")
.addAction(R.drawable.ic_launcher_foreground, "Delete", pendingDeleteIntent)
.build();
// Show the notification
NotificationManagerCompat.from(this).notify(CHANNEL_CHARGING_NOTIFICATION_ID, notification);
```
请注意,这里使用的通知渠道 ID 是 `"com.example.myapplication"`,这是您自己定义的字符串。在创建通知时,需要使用相同的通知渠道 ID。
Intent deleteIntent = new Intent(this, MainActivity.class); deleteIntent.setAction(ACTION_DELETE_NOTIFICATION); PendingIntent pendingDeleteIntent = PendingIntent.getBroadcast(this, 0, deleteIntent, PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE); NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "com.example.myapplication") .setSmallIcon(R.drawable.ic_launcher_background) .setContentTitle("My notification") .setContentText("Hello World!") .addAction(R.drawable.ic_launcher_foreground, "Delete", pendingDeleteIntent); Notification build = builder.build(); NotificationManagerCompat.from(this).notify(CHANNEL_CHARGING_NOTIFICATION_ID, build); } 报错说 No Channel found for pkg=com.example.myapplication 如何解决
这个错误提示是因为在创建通知时使用了不存在的通知渠道,需要先创建一个通知渠道,然后将其与通知相关联。可以按照以下步骤解决:
1. 在应用的创建时,创建通知渠道,代码如下:
```java
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel("com.example.myapplication", "MyApp", NotificationManager.IMPORTANCE_HIGH);
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
```
2. 在创建通知时,指定通知渠道,代码如下:
```java
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "com.example.myapplication")
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentTitle("My notification")
.setContentText("Hello World!")
.addAction(R.drawable.ic_launcher_foreground, "Delete", pendingDeleteIntent);
Notification build = builder.build();
NotificationManagerCompat.from(this).notify(CHANNEL_CHARGING_NOTIFICATION_ID, build);
```
这样就可以解决该错误。
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