将数据从活动发送到WearableListenerService

Question

当我读到关于Activity和Service之间的通信时，我发现我们可以使用

• IBinder
• 信使
• AIDL

我对前两件很感兴趣。因此，当我尝试实现Activity和WearableListenerService之间的通信时，我需要覆盖onBind函数。

但是，我得到一个编译器错误说它。

不能覆盖最终方法"onBind"

当我使用普通的Service时，我不会遇到这样的错误。所以,

1.是否意味着我们不能使用IBinder或Messenger方法从Activity与WearableListenerService通信

2.如果是，那么从Activity (或从活动中调用该服务的公共方法)向WearableListenerService传递消息的下一个最佳方式是什么？

Answer 1

经过一番挖掘，我找到了解决办法。希望它能帮到别人。

我们可以使用WearableListenerService函数从一个活动发送消息到Wearable.MessageApi。当Activity和WearableListenerService位于同一个节点(设备)上时，我们需要获取本地节点(发送消息的当前节点)的实例，以发送消息如下

NodeApi.GetLocalNodeResult nodes = Wearable.NodeApi.getLocalNode(mGoogleApiClient).await();

而不是

NodeApi.GetConnectedNodesResult nodes  = Wearable.NodeApi.getConnectedNodes(mGoogleApiClient).await();

用于将其他设备(如磨损)连接到电话的列表。

因此，我成功地将活动中的消息发送给WearableListenerService，如下所示

活动代码

public class PhoneActivity extends Activity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{

    private static final String TAG = "PhoneActivity";

    public static final String CONFIG_START = "config/start";
    public static final String CONFIG_STOP= "config/stop"

    Intent intent;
    TextView txtview;

    GoogleApiClient mGoogleApiClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_phone);

        if(null == mGoogleApiClient) {
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addApi(Wearable.API)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .build();
            Log.v(TAG, "GoogleApiClient created");
        }

        if(!mGoogleApiClient.isConnected()){
            mGoogleApiClient.connect();
            Log.v(TAG, "Connecting to GoogleApiClient..");
        }

        startService(new Intent(this, PhoneService.class));
    }

    @Override
    public void onConnectionSuspended(int cause) {
        Log.v(TAG,"onConnectionSuspended called");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.v(TAG,"onConnectionFailed called");
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        Log.v(TAG,"onConnected called");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.v(TAG, "onStart called");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.phone, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_start_) {
            new SendActivityPhoneMessage(CONFIG_START,"").start();
        }else if (id == R.id.action__stop) {
            new SendActivityPhoneMessage(CONFIG_STOP,"").start();
        }else if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    class SendActivityPhoneMessage extends Thread {
        String path;
        String message;

        // Constructor to send a message to the data layer
        SendActivityPhoneMessage(String p, String msg) {
            path = p;
            message = msg;
        }

        public void run() {
            NodeApi.GetLocalNodeResult nodes = Wearable.NodeApi.getLocalNode(mGoogleApiClient).await();
            Node node = nodes.getNode();
            Log.v(TAG, "Activity Node is : "+node.getId()+ " - " + node.getDisplayName());
            MessageApi.SendMessageResult result = Wearable.MessageApi.sendMessage(mGoogleApiClient, node.getId(), path, message.getBytes()).await();
            if (result.getStatus().isSuccess()) {
                Log.v(TAG, "Activity Message: {" + message + "} sent to: " + node.getDisplayName());
            }
            else {
                // Log an error
                Log.v(TAG, "ERROR: failed to send Activity Message");
            }
        }
    }
}

服务代码

public class PhoneService extends WearableListenerService implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{

    private static final String TAG = "PhoneService";

    public static final String CONFIG_START = "config/start";
    public static final String CONFIG_STOP = "config/stop";

    GoogleApiClient mGoogleApiClient;

    public PhoneService() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.v(TAG, "Created");

        if(null == mGoogleApiClient) {
            mGoogleApiClient = new GoogleApiClient.Builder(this)
                    .addApi(Wearable.API)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .build();
            Log.v(TAG, "GoogleApiClient created");
        }

        if(!mGoogleApiClient.isConnected()){
            mGoogleApiClient.connect();
            Log.v(TAG, "Connecting to GoogleApiClient..");
        }
    }

    @Override
    public void onDestroy() {

        Log.v(TAG, "Destroyed");

        if(null != mGoogleApiClient){
            if(mGoogleApiClient.isConnected()){
                mGoogleApiClient.disconnect();
                Log.v(TAG, "GoogleApiClient disconnected");
            }
        }

        super.onDestroy();
    }

    @Override
    public void onConnectionSuspended(int cause) {
        Log.v(TAG,"onConnectionSuspended called");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.v(TAG,"onConnectionFailed called");
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        Log.v(TAG,"onConnected called");

    }

    @Override
    public void onDataChanged(DataEventBuffer dataEvents) {
        super.onDataChanged(dataEvents);
        Log.v(TAG, "Data Changed");
    }

    @Override
    public void onMessageReceived(MessageEvent messageEvent) {
        super.onMessageReceived(messageEvent);
        if(messageEvent.getPath().equals(CONFIG_START)){
            //do something here
        }else if(messageEvent.getPath().equals(CONFIG_STOP)){
            //do something here
        }
    }

    @Override
    public void onPeerConnected(Node peer) {
        super.onPeerConnected(peer);
        Log.v(TAG, "Peer Connected " + peer.getDisplayName());
    }

    @Override
    public void onPeerDisconnected(Node peer) {
        super.onPeerDisconnected(peer);
        Log.v(TAG, "Peer Disconnected " + peer.getDisplayName());
    }
}