我试图使用数据项将一些字符串发送到我的穿戴设备，但我的穿戴设备似乎从未收到任何信号，因为 onDataChanged() 从未被调用。我什至设置了一个时间戳，以确保每次发送数据时始终不同。
有没有特定的方法我必须将应用程序安装到两台设备上才能使其正常工作？我只需单击“运行”并选择我的手机，然后切换模块并对我的穿戴设备执行相同的操作。
这是我手机上主要活动的代码：
public class HomeActivity extends Activity{
public static String TAG = "HomeActivity";
private GoogleApiClient mGoogleApiClient;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.home_view);
Button mButton = (Button) findViewById(R.id.send_button);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendData();
}
});
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
@Override
public void onConnected(Bundle bundle) {
}
@Override
public void onConnectionSuspended(int i) {
}
}).addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener() {
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
}).addApi(Wearable.API)
.build();
mGoogleApiClient.connect();
}
private void sendData(){
if (mGoogleApiClient!=null){
return;
}
final PutDataMapRequest putRequest = PutDataMapRequest.create("/SAMPLE");
final DataMap map = putRequest.getDataMap();
map.putInt("color", Color.RED);
map.putLong("date", new Date().getTime());
Wearable.DataApi.putDataItem(mGoogleApiClient, putRequest.asPutDataRequest());
}
}
这是我的可穿戴设备上的代码：
public class LayoutFaceService extends CanvasWatchFaceService implements DataApi.DataListener{
@Override
public void onCreate(){
super.onCreate();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(Wearable.API)
.addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
@Override
public void onConnected(Bundle bundle) {
Log.i(TAG, "Connected");
Wearable.DataApi.addListener(mGoogleApiClient, LayoutFaceService.this);
}
@Override
public void onConnectionSuspended(int i) {
}
})
.addOnConnectionFailedListener(new GoogleApiClient.OnConnectionFailedListener() {
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
})
.build();
mGoogleApiClient.connect();
}
@Override
public void onDataChanged(DataEventBuffer dataEvents) {
for (DataEvent event : dataEvents) {
if (event.getType() == DataEvent.TYPE_DELETED) {
Log.d(TAG, "DataItem deleted: " + event.getDataItem().getUri());
} else if (event.getType() == DataEvent.TYPE_CHANGED) {
Log.d(TAG, "DataItem changed: " + event.getDataItem().getUri());
}
}
}
我的穿着明显：
<uses-feature android:name="android.hardware.type.watch" />
<uses-permission android:name="com.google.android.permission.PROVIDE_BACKGROUND" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.DeviceDefault" >
<service
android:name=".LayoutFaceService"
android:label="@string/my_digital_name"
android:permission="android.permission.BIND_WALLPAPER" >
<meta-data
android:name="android.service.wallpaper"
android:resource="@xml/watch_face" />
<meta-data
android:name="com.google.android.wearable.watchface.preview"
android:resource="@drawable/preview_digital" />
<meta-data
android:name="com.google.android.wearable.watchface.preview_circular"
android:resource="@drawable/preview_digital_circular" />
<intent-filter>
<action android:name="android.service.wallpaper.WallpaperService" />
<category android:name="com.google.android.wearable.watchface.category.WATCH_FACE" />
<action android:name="com.google.android.gms.wearable.BIND_LISTENER" />
</intent-filter>
</service>
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
