oreo中的sendOrderedBroadcast setPackage要求 [英] sendOrderedBroadcast setPackage requirement in Oreo

问题描述

为什么以下 Ordered Broadcast 在Android Oreo中失败，除非我具体设置包名？

Why would the following Ordered Broadcast fail in Android Oreo, unless I specifically set the package name?

final Intent vrIntent = new Intent(RecognizerIntent.ACTION_GET_LANGUAGE_DETAILS);

// Setting the package it will work. Omitting, it will fail
// vrIntent.setPackage("com.google.android.googlequicksearchbox");

getContext().sendOrderedBroadcast(vrIntent, null, new BroadcastReceiver() {

    @Override
    public void onReceive(final Context context, final Intent intent) {

                // final Bundle bundle = intent.getExtras();
                final Bundle bundle = getResultExtras(true);

                if (bundle != null) {

                    if (bundle.containsKey(RecognizerIntent.EXTRA_SUPPORTED_LANGUAGES)) {
                        Log.i("TAG", "onReceive: EXTRA_SUPPORTED_LANGUAGES present");

                        final ArrayList<String> vrStringLocales = bundle.getStringArrayList(
                                RecognizerIntent.EXTRA_SUPPORTED_LANGUAGES);

                        Log.i("TAG", "onReceive: EXTRA_SUPPORTED_LANGUAGES size: " + vrStringLocales.size());

                    } else {
                        Log.w("TAG", "onReceive: missing EXTRA_SUPPORTED_LANGUAGES");
                    }

                } else {
                    Log.w("TAG", "onReceive: Bundle null");
                }

}, null, 1234, null, null);

如果未设置包名， EXTRA_SUPPORTED_LANGUAGES 将会失踪。

If the package name is not set, EXTRA_SUPPORTED_LANGUAGES will be missing.

我最近问了一个赏金问题我没有设置包名的'遗留代码'在Oreo中失败，但在以前的Android版本上成功运行。

I recently asked a bounty question where my 'legacy code', which didn't set the package name, was failing in Oreo, but worked successfully on previous Android versions.

检查了所有的<一个href =https://developer.android.com/about/versions/oreo/android-8.0-changes.html =nofollow noreferrer> API 26中的行为变化我什么都看不到解释一下。

Having checked all of the behavioural changes in API 26 I can see nothing that would explain this.

有人可以解释可能的原因吗？

Can anyone shed some light on the possible cause please?

注意：示例代码和问题假设设备有 Google的现在应用程序，以提供 RecognitionService

Note: The sample code and issue assumes the device has Google's 'Now' application installed to provide the RecognitionService

推荐答案

好的，我转载了这个问题。 1234 结果代码是一个红色的鲱鱼—看起来 RecognizerIntent 背后的过程没有设置结果代码，所以你得到了初始代码。

OK, I reproduced the problem. The 1234 result code was a red herring — it looks like the process behind RecognizerIntent does not set a result code, so you get the initial code.

但是，你确实在Android 8.1（并且，可能是8.0）上收到此错误消息：

However, you do get this error message on Android 8.1 (and, presumably, 8.0):

W/BroadcastQueue: Background execution not allowed: receiving Intent { act=android.speech.action.GET_LANGUAGE_DETAILS flg=0x10 } to com.google.android.googlequicksearchbox/com.google.android.voicesearch.intentapi.IntentApiReceiver

这就是你在清单中注册了一个接收者，我们不打算给你广播，因为你在后台错误。

That's the "you registered a receiver in the manifest, and we're not going to give you the broadcast, because you are in the background" error.

这个经过轻度测试的 sendImplicitOrderedBroadcast（）方法解决了这个问题，同时原则上维护了接收器的顺序（降序为优先权）：

This lightly-tested sendImplicitOrderedBroadcast() method works around the problem, while in principle maintaining the order of receivers (descending by priority):

  private void sendImplicitOrderedBroadcast(Intent i, String receiverPermission,
                                            BroadcastReceiver resultReceiver,
                                            Handler scheduler, int initialCode,
                                            String initialData,
                                            Bundle initialExtras) {
    PackageManager pm=getPackageManager();
    List<ResolveInfo> matches=pm.queryBroadcastReceivers(i, 0);

    Collections.sort(matches,
      (left, right) -> right.filter.getPriority()-left.filter.getPriority());

    for (ResolveInfo resolveInfo : matches) {
      Intent explicit=new Intent(i);
      ComponentName cn=
        new ComponentName(resolveInfo.activityInfo.applicationInfo.packageName,
          resolveInfo.activityInfo.name);

      explicit.setComponent(cn);
      sendOrderedBroadcast(explicit, receiverPermission, resultReceiver,
        scheduler, initialCode, initialData, initialExtras);
    }
  }

我冒昧提交问题。

这篇关于oreo中的sendOrderedBroadcast setPackage要求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！