Question

所以我需要一种方法来确定是否有针对特定操作字符串注册的broadCastReceiver。

因此，为了检查意图是否可用，我们有方法（来自 http://www.vogella.com/articles/AndroidIntent/article.html）

public boolean isIntentAvailable(Context context, String action) {
    final PackageManager packageManager = context.getPackageManager();
    final Intent intent = new Intent(action);
    List<ResolveInfo> resolveInfo =
            packageManager.queryIntentActivities(intent,
                    PackageManager.MATCH_DEFAULT_ONLY);
   if (resolveInfo.size() > 0) {
        return true;
    }
   return false;
}

哪个有效，但是我的测试只查看注册活动的意图。我有一个broadCastReceiver注册了特定的操作字符串。它从未将其视为已注册。但如果我发射广播。广播反应。因此，在这种情况下，方法不起作用。

想法？

Answer 1

几乎相同，对于广播接收器，您应该拨打PackageManager#queryBroadcastReceivers。

public abstract List<ResolveInfo> queryBroadcastReceivers (Intent intent, int flags)

Since: API Level 1
Retrieve all receivers that can handle a broadcast of the given intent.

Parameters
intent  The desired intent as per resolveActivity().
flags   Additional option flags.

Returns
A List<ResolveInfo> containing one entry for each matching Receiver. These are ordered from first to last in priority. If there are no matching receivers, an empty list is returned.

查看文档，看看还能得到什么。

Answer 2

try {
    if (sendBroadcastReceiver != null) {
        this.unregisterReceiver(sendBroadcastReceiver);
    }
} catch (IllegalArgumentException e) {
    sendBroadcastReceiver = null;
}

检查是否有使用操作字符串注册的BroadCastReceiver

2 个答案: