从Android可穿戴设备获取语音输入

Question

目前，谷歌Hangouts和Facebook Messenger等应用程序能够接受来自Android可穿戴设备的语音输入，将其转换为文本，并向用户发送回复信息。我遵循了https://developer.android.com/training/wearables/notifications/voice-input.html的教程，当我调用这里概述的方法时：

private CharSequence getMessageText(Intent intent) {
    Bundle remoteInput = RemoteInput.getResultsFromIntent(intent);
        if (remoteInput != null) {
            return remoteInput.getCharSequence(EXTRA_VOICE_REPLY);
        }
    }
    return null;
}

我收到一行RemoteInput.getResultsFrominTent（intent）的错误，指出我的API级别太低。目前使用三星Galaxy S3,4.4.2 API 19。显然，我无法访问这种方法，所以我的问题是，像Hangouts和Facebook Messenger这样的应用程序是如何接受语音输入并将其输入到我的设备上的？

Answer 1

developers.Android声明RemoteInput.getResultsFrominTent（intent）；是一个传达，这样我们就不需要解析ClipData，所以我做了一些研究，不知道解析这个ClipData到底需要什么，这就是我解决问题的方法：

private void getMessageText(Intent intent){

    ClipData extra = intent.getClipData();

    Log.d("TAG", "" + extra.getItemCount());    //Found that I only have 1 extra
    ClipData.Item item = extra.getItemAt(0);    //Retreived that extra as a ClipData.Item

    //ClipData.Item can be one of the 3 below types, debugging revealed
        //The RemoteInput is of type Intent

    Log.d("TEXT", "" + item.getText());
    Log.d("URI", "" + item.getUri());
    Log.d("INTENT", "" + item.getIntent());

    //I edited this step multiple times until I discovered that the
    //ClipData.Item intent contained extras, or rather 1 extra, which was another bundle
    //The key for that bundle was "android.remoteinput.resultsData"
    //and the key to get the voice input from wearable notification was EXTRA_VOICE_REPLY which
    //was set in my previous activity that generated the Notification. 

    Bundle extras = item.getIntent().getExtras();
    Bundle bundle = extras.getBundle("android.remoteinput.resultsData");

    for (String key : bundle.keySet()) {
        Object value = bundle.get(key);
        Log.d("TAG", String.format("%s %s (%s)", key,
                value.toString(), value.getClass().getName()));
    }

    tvVoiceMessage.setText(bundle.get(EXTRA_VOICE_REPLY).toString());
}

对于那些在Android-L发布之前有兴趣开发使用通知和语音输入回复的可穿戴应用程序的人来说，这个答案应该很有用。