java - 使用方法引用定义 BroadcastReceiver.onReceive

Question

使用 Jack 对 Java 8 的支持，我希望能够编写类似的内容:

public void onReceive(Context context, Intent intent) {
    if (!intent.getAction().equals(ACTION_BINGO)) return;
    Log.d(TAG, "Bingo!");
}

... 

registerReceiver(this::onReceive, INTENT_FILTER_BINGO);

不幸的是，这是不可能的。虽然 onReceive() 是 BroadcastReceiver 特有的抽象方法，但那东西不是一个接口(interface)，而是一个抽象类>，它似乎无法被 lambda 表达式替换。有什么建议可以解决这个问题吗？

Answer 1

使用this answer中概述的技巧，这是我得到的:

public class BroadcastReceiver extends android.content.BroadcastReceiver {

    private final BiConsumer<Context, Intent> receiver;

    public BroadcastReceiver(final BiConsumer<Context, Intent> onReceive) {
        receiver = onReceive;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        if (receiver == null) {
            throw new UnsupportedOperationException("Not yet implemented");
        }
        receiver.accept(context, intent);
    }
}

不像我预期的那么简洁，但更好:

BroadcastReceiver receiver = new BroadcastReceiver(this::onReceive);
registerReceiver(receiver, INTENT_FILTER_BINGO);