Question

我正在尝试使用dataitem 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");
}

我错过了什么来触发数据更改？我看了this和this，但我仍然不清楚我应该更改什么才能更改数据

Answer 1

如果您使用的是DataApi.DataListener，则必须在连接GoogleApiClient后添加addListener。类似于：Wearable.DataApi.addListener(mGoogleApiClient, this)中的GoogleApiClient.ConnectionCallbacks。

如果您正在使用WearableListenerService，请确保您在接收/收听方的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>

另请注意，只有在数据实际更改时才会调用onDataChanged。让我们说旧的数据是（＆＃34; Person＆＃34;，＆＃34; Bob＆＃34;）并用相同的数据替换它（＆＃34; Person＆＃34;，＆＃34; ; Bob＆＃34;），然后onDataChanged将不会被触发，因为数据实际上没有改变。但是，如果您将（＆＃34; Person＆＃34;，＆＃34; Bob2＆＃34;）改为使用，onDataChanged将被触发。

永远不会调用OnDataChanged

1 个答案: