对于我的第一个使用磨损的项目，我开始很简单 - 使用DataLayer将一个字符串从Android发送到Wear。这实际上是对一个更大的项目的测试，我需要做的就是有一个同步的字符串。
在运行项目时，Log始终显示字符串已成功发送，“onConnected”始终显示为null。不用说，手表是连接的。我认为连接是问题所在，因为它可以解释为什么没有任何事情发生/在磨损上运行。调试：我正在使用通过USB连接的Moto Z Play和通过蓝牙调试的Lg G Watch。没有安装问题。但是，Connection始终显示为null。
我有一个onDataChanged服务，它在检测到更改时通过Toast显示字符串（“Testing”）。这从未发生过。如上所述，我认为这是一个连接问题，但它也可能来自不当使用。我道歉，我是一名自学成才的高中生。我感谢任何帮助或澄清。
电话活动：
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
//Global variables.
private static final int importFileCode = 1;
//Used for Wear DataLayer
private static final String TAG = "MainActivity";
private GoogleApiClient mGoogleApiClient;
private boolean mResolvingError = false;
//Method001: Creates the interfaces, calls necessary methods.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
//Used to initiate GoogleAPiClient
initiateAPI();
//Used to test the data layer
sendAccsRequest("Testing");
}
@Override
public void onConnected(Bundle connectionHint) {
Log.d(TAG, "onConnected: " + connectionHint);
}
@Override
public void onConnectionSuspended(int i) {
Log.d(TAG, "onConnectionSuspended: " + i);
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.d(TAG, "onConnectionFailed: " + connectionResult);
}
//Initiates the google api client.
public void initiateAPI () {
//GoogleApiClient used for connection w/the phone
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mGoogleApiClient.connect();
}
//Used to send the string with info to wear, hopefully.
public void sendAccsRequest(String allInfo) {
//Creates a request with a unique key
PutDataMapRequest putDataMapRequest = PutDataMapRequest.create("/allInfo");
//Inserts the variables using the keys
putDataMapRequest.getDataMap().putString("strAllInfo", allInfo);
PutDataRequest request = putDataMapRequest.asPutDataRequest();
Wearable.DataApi.putDataItem(mGoogleApiClient, request)
.setResultCallback(new ResultCallback<DataApi.DataItemResult>() {
@Override
public void onResult(DataApi.DataItemResult dataItemResult) {
if (!dataItemResult.getStatus().isSuccess()) {
Log.e("sendAccs", "Failed to send accs");
} else {
Log.d("sendAccs", "Successfully sent accs");
}
}
});
}
}
穿着活动：
public class Main extends WearableActivity implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
DataApi.DataListener, MessageApi.MessageListener, CapabilityApi.CapabilityListener {
private GoogleApiClient mGoogleApiClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
//Initiates the google api client
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
// Enables Always-on
setAmbientEnabled();
}
@Override
public void onConnected(Bundle connectionHint) {
Log.d("onConnected(): ","Successfully connected to Google API client");
Wearable.DataApi.addListener(mGoogleApiClient, this);
Wearable.MessageApi.addListener(mGoogleApiClient, this);
Wearable.CapabilityApi.addListener(
mGoogleApiClient, this, Uri.parse("wear://"), CapabilityApi.FILTER_REACHABLE);
}
@Override
public void onConnectionSuspended(int i) {
Log.e("onConnectionSuspended()",": Connection to Google API client was suspended");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Log.e("onConnectionFailed(): ","Failed to connect, with result: " + connectionResult);
}
@Override
public void onDataChanged(DataEventBuffer dataEventBuffer) {
for (DataEvent event : dataEventBuffer) {
if (event.getType() == DataEvent.TYPE_CHANGED) {
String path = event.getDataItem().getUri().getPath();
if (dataChangeService.accPath.equals(path)) {
DataMapItem dataMapItem = DataMapItem.fromDataItem(event.getDataItem());
String allInfo = dataMapItem.getDataMap()
.getString("strAllInfo");
//Prints out received string
Log.e("strAllInfo: ", allInfo);
}
} else {
Log.e("Unknown data event type", "Type = " + event.getType());
}
}
}
@Override
public void onMessageReceived(MessageEvent messageEvent) {
}
@Override
public void onCapabilityChanged(CapabilityInfo capabilityInfo) {
}
}
dataChangeService（Wear）：
public class dataChangeService extends WearableListenerService {
GoogleApiClient mGoogleApiClient;
public static final String accPath = "/allInfo";
@Override
public void onCreate() {
super.onCreate();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.build();
mGoogleApiClient.connect();
}
@Override
public void onDataChanged(DataEventBuffer dataEvents) {
Log.d("dataChangeService", "Successfully running");
for (DataEvent dataEvent : dataEvents) {
if (dataEvent.getType() == DataEvent.TYPE_CHANGED) {
DataMap dataMap = DataMapItem.fromDataItem(dataEvent.getDataItem()).getDataMap();
String path = dataEvent.getDataItem().getUri().getPath();
if (path.equals("/allInfo")) {
String allInfo = dataMap.getString("strAllInfo");
Toast.makeText(dataChangeService.this, "AllInfo: " + allInfo, Toast.LENGTH_SHORT).show();
}
}
}
}
}
Android Manifest for Wear：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="noobyguy.testapp">
<uses-feature android:name="android.hardware.type.watch" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@android:style/Theme.DeviceDefault">
<uses-library
android:name="com.google.android.wearable"
android:required="true" />
<!--
Set to true if your app is Standalone, that is, it does not require the handheld
app to run.
-->
<meta-data
android:name="com.google.android.wearable.standalone"
android:value="true" />
<activity
android:name=".Main"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<service
android:name=".dataChangeService"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name = "come.google.android.gms.wearable.BIND_LISTENER"/>
</intent-filter>
</service>
</application>
</manifest>
谢谢您的帮助！说真的，我确实最终搞清了这个问题。
mGoogleApiClient.connect();但主要是清单是问题，因为BIND_LISTENER（由Udacity建议）需要用以下内容替换;
<service
android:name=".dataChangeService"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="com.google.android.gms.wearable.DATA_CHANGED" />
<data android:scheme="wear" android:host="*" android:pathPrefix="/allInfo"/>
</intent-filter>