OnDataChanged 永远不会被调用 [英] OnDataChanged is never called

问题描述

我正在尝试数据项 APi，这是我的代码

I am trying the dataitem APi and here is my code

mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
                @Override
                public void onConnected(Bundle connectionHint) {
                    Log.d("Inside", "onConnected: " + connectionHint);
                    Toast.makeText(getApplicationContext(),"Inside On connected",Toast.LENGTH_SHORT).show();
                    // Now you can use the Data Layer API
                    //Creating Dataitem
                    PutDataMapRequest dataMapRequest = PutDataMapRequest.create("/count");
                    dataMapRequest.setUrgent();
                    DataMap datamap=dataMapRequest.getDataMap();
                    PutDataRequest putDataRequest=dataMapRequest.asPutDataRequest();
                    datamap.putString("key", "Value");
                    PendingResult<DataApi.DataItemResult> pendingResult =
                            Wearable.DataApi.putDataItem(mGoogleApiClient, putDataRequest);
                }
                @Override
                public void onConnectionSuspended(int cause) {
                    Log.d("Inside", "onConnectionSuspended: " + cause);
                }
            })
            .addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener() {
                @Override
                public void onConnectionFailed(ConnectionResult result) {
                    Log.d("Inside", "onConnectionFailed: " + result);
                }
            })
            // Request access only to the Wearable API
            .addApiIfAvailable(Wearable.API)
            .build();
    mGoogleApiClient.connect();
}

@Override
public void onDataChanged(DataEventBuffer dataEventBuffer) {
    Log.d("Inside","onDataChanged");
}

我错过了什么来触发数据更改?.我阅读了this和this 但我仍然不清楚我应该更改什么才能输入更改的数据

What am I missing out to trigger on data changed?. I read this and this but I am still unclear what am I supposed to change to enter on data changed

推荐答案

如果你使用的是DataApi.DataListener，那么你必须在连接GoogleApiClient后添加Listener.类似于:Wearable.DataApi.addListener(mGoogleApiClient, this) 在您的 GoogleApiClient.ConnectionCallbacks 中.

If you are using DataApi.DataListener, then you have to addListener after GoogleApiClient connected. Something like: Wearable.DataApi.addListener(mGoogleApiClient, this) inside your GoogleApiClient.ConnectionCallbacks.

如果您使用的是 WearableListenerService，请确保您的 AndroidManifest.xml 中接收/侦听端具有类似的代码，如下所示:

If you are using WearableListenerService make sure you have similar code in your AndroidManifest.xml on the receiving/listening side as shown below:

<service android:name=".YourCustomWearableListenerService">
    <intent-filter>
        <action android:name="com.google.android.gms.wearable.DATA_CHANGED"/>
            <data android:scheme="wear" 
                  android:host="*" 
                  <!-- I believe pathPrefix is optional, removing it will make the service listener to all data change events -->
                  android:pathPrefix="/YourDataMapPathPrefix"/>
        </intent-filter>
</service>

还要记住，只有在数据实际更改时，onDataChanged 才会被调用.假设旧数据是 ("Person", "Bob") 并且您将其替换为相同的数据 ("Person", "Bob")，那么 onDataChanged 将不会被触发，因为数据确实如此事实上不会改变.但是如果你输入 ("Person", "Bob2") ， onDataChanged 会被触发.

Also keep in mind that onDataChanged will get call only if the data is ACTUALLY changed. Let's said that the old data is ("Person", "Bob") and you replace it with same data ("Person", "Bob"), then onDataChanged will not get triggered since the data does not change in fact. But onDataChanged will get triggered if you put ("Person", "Bob2") instead.

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