什么是Ondatachanged在Android中的生命周期？

Question

当我在android中调用onDatachanged时，我试图了解事件的流程。据我所知，程序的理想流程应首先打印“Inside onclick”然后“在Ondatachanged内部”和“onclick的结束”然而流程我得到的是随机的，对于第二和第三行。任何人都可以解释我如何使流量线性化，为什么它是非线性的？另外，当我第一次输入数据时，不会调用Ondatachanged。为什么是什么？

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    setAmbientEnabled();
    //Google client
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(new GoogleApiClient.ConnectionCallbacks() {
                @Override
                public void onConnected(Bundle connectionHint) {
                    Log.d("Inside", "onConnected " );


                }
                @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();
    Intent service= new Intent(this,WearbleService.class);
    startService(service);
    Wearable.DataApi.addListener(mGoogleApiClient, this);
    //Listener for button
    Button done=(Button)findViewById(R.id.button);
    done.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d("Inside","Onclick");
            PutDataMapRequest putDataMapReq = PutDataMapRequest.create("/count");
            int count=0;
            putDataMapReq.getDataMap().putString("key", "HelloWOrld");
            PutDataRequest putDataReq = putDataMapReq.asPutDataRequest();
            PendingResult<DataApi.DataItemResult> pendingResult =
                    Wearable.DataApi.putDataItem(mGoogleApiClient, putDataReq);
           // putDataMapReq.getDataMap().putString("key", "helloWorld");
            putDataReq = putDataMapReq.asPutDataRequest();
            pendingResult =
                    Wearable.DataApi.putDataItem(mGoogleApiClient, putDataReq);
            Log.d("End of ", "Onclick " );

        }
    });

  @Override
public void onDataChanged(DataEventBuffer dataEventBuffer) {
    Log.d("Inside","OndataChanged");
}