NotificationCompat.setStyle（）不能得到Notification.MediaStyle

问题描述

我发现原来MediaStyle的setStyle是不是当我用工作 NotificationCompat.builder（本）发出通知。

I've found out that the MediaStyle setStyle is not working when I'm using NotificationCompat.builder(this) to make a notification.

我的意思是，当NotificationCompat.Builder对用这个（这个）：

I mean, When using this on NotificationCompat.Builder(this):

.setStyle(new Notification.MediaStyle()
         .setMediaSession(mySession))

它说，它希望获得 NotificationCompat.style 而不是 Notification.MediaStyle 。

你能不能帮我解决这个问题？是否有任何替代NotificationCompat？

Can you help me solve that problem?Is there any replacement for the NotificationCompat?

感谢。

推荐答案

这个问题已经得到解决，如果你在的Andr​​oid链接支持库版本22.2.1 （2015年七月）：

Update

This problem is fixed now if you link in Android Support Library revision 22.2.1 (July 2015):

• 提供的 NotificationCompat.MediaStyle 类

下面是我的解决方法的不NotificationCompat.MediaStyle。

Here's my workaround for "There is no NotificationCompat.MediaStyle in the support library".

它避免了重复应用逻辑和可以很容易地背出解决办法，如果/当NotificationCompat支持 MediaStyle 。

It avoids duplicating application logic and makes it easy to back out the workaround if/when NotificationCompat supports MediaStyle.

目的：这可以很容易地使用 MediaStyle 的API 21+（提供紧凑型和扩展通知布局，带有按钮），或在旧版本的Andr​​oid（只是一个布局，按钮）。

Purpose: This makes it easy to use the MediaStyle in API 21+ (offering compact and expanded notification layouts, with buttons), or an ordinary notification layout on older versions of Android (just one layout, with buttons).

注意：：如果你的目标是把多个版本的Andr​​oid锁屏界面上的按钮，就可以用这个方法来实现锁屏通知API 21+，同时也实现锁屏窗口小部件对老年人的API。

Note: If your goal is to put buttons on the lock screen on multiple versions of Android, you can use this approach to implement lock screen notifications for API 21+, and also implement a lock screen widget for older APIs.

如何：首先，创建一个新的通知建设者兼容包，从一个接口交替底层实现。从 NotificationCompat.Builder 婴儿床，剥离下来到所需要的功能：

How to: First, create a new notification builder compatibility package, starting with an interface to alternate underlying implementations. Crib from NotificationCompat.Builder, stripped down to the needed features:

public interface NotificationBuilder {
    public NotificationBuilder setWhen(long when);
    public NotificationBuilder setUsesChronometer(boolean b);
    public NotificationBuilder setSmallIcon(int icon);
    // ...

    /** Sets MediaStyle with setShowActionsInCompactView(). */
    public NotificationBuilder setMediaStyleActionsInCompactView(int... actions);

    public Notification build();
}

二，使建立在一个实施 NotificationCompat.Builder ：

public class V20Builder implements NotificationBuilder {
    private NotificationCompat.Builder builder;

    public V20Builder(Context context) {
        builder = new NotificationCompat.Builder(context);
    }

    @Override
    public NotificationBuilder setWhen(long when) {
        builder.setWhen(when);
        return this;
    }

    @Override
    public NotificationBuilder setUsesChronometer(boolean b) {
        builder.setUsesChronometer(b);
        return this;
    }

    @Override
    public NotificationBuilder setSmallIcon(int icon) {
        builder.setSmallIcon(icon);
        return this;
    }

    // ...

    @Override
    public NotificationBuilder setMediaStyleActionsInCompactView(int... actions) {
        // Noop for Android API V20-.
        return this;
    }

    @Override
    public Notification build() {
        return builder.build();
    }
}

三是建立在一个实施 Notification.Builder ：

@TargetApi(21)
public class V21Builder implements NotificationBuilder {
    private Notification.Builder builder;

    public V21Builder(Context context) {
        builder = new Notification.Builder(context);
    }

    @Override
    public NotificationBuilder setWhen(long when) {
        builder.setWhen(when);
        return this;
    }

    @Override
    public NotificationBuilder setUsesChronometer(boolean b) {
        builder.setUsesChronometer(b);
        return this;
    }

    @Override
    public NotificationBuilder setSmallIcon(int icon) {
        builder.setSmallIcon(icon);
        return this;
    }

    // ...

    @Override
    public NotificationBuilder setMediaStyleActionsInCompactView(int... actions) {
        new Notification.MediaStyle(builder).setShowActionsInCompactView(actions);
        return this;
    }

    @Override
    public Notification build() {
        return builder.build();
    }
}

四，添加一个工厂方法实例正确的建设者：

Fourth, add a factory method to instantiate the right builder:

public NotificationBuilder makeBuilder() {
  if (Build.VERSION.SDK_INT >= 21) { // Load the API V21 class only if the OS can load it.
      return new V21Builder(context);
  }
  return new V20Builder(context);
}

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