永远不会调用 OnDataChanged

Question

我正在尝试数据项 APi，这是我的代码

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");
}

我错过了什么触发数据更改？我阅读了 this and this 但我仍然不清楚我应该更改什么以输入已更改的数据

Answer 1

如果您使用的是DataApi.DataListener，那么您必须在GoogleApiClient 连接后添加Listener。像这样的东西：Wearable.DataApi.addListener(mGoogleApiClient, this) 在你的 GoogleApiClient.ConnectionCallbacks.

里面

如果您使用的是 WearableListenerService，请确保您在 receiving/listening 端的 AndroidManifest.xml 中有类似的代码，如下所示：

<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>

另请记住，onDataChanged 只有在数据实际更改时才会被调用。假设旧数据是（"Person"，"Bob"），你用相同的数据（"Person"，"Bob"）替换它，那么onDataChanged将得不到触发，因为数据实际上没有改变。但是如果你把 ("Person", "Bob2") 改为 onDataChanged 就会被触发。

永远不会调用 OnDataChanged

OnDataChanged is never called

android

dataitem

wear-os