尝试将数据从Android Tablet发送到Android Wear设备并丢失 [英] Trying to send data from Android Tablet to Android Wear device and losing

问题描述

我真的可以使用一些帮助。我无法让我的Android Wear设备识别在我的Android平板电脑上运行的活动所造成的数据更改。我是Android新手，还是Wear API新手，所以我可能会遗漏一些完全显而易见或琐碎的东西，而没有意识到。我从Android Wear文档页面和github上的TwoToasters示例中的几个示例中整理了一个项目。我只想在设备之间建立数据通信，以便随后可以编辑代码，以便在Wear设备上显示平板电脑上的图像。最终，我希望能够从平板电脑在Wear设备上开始/停止幻灯片播放，但是一旦我建立了数据通信协议并开始工作，我应该能够独自到达那里，所以我真的只是在寻找帮助。到目前为止，这是我的代码：

I could really use some help. I'm having trouble getting my Android Wear device to recognize data changes made by my activity that runs on my Android tablet. I'm relatively new to Android and very new to the Wear APIs so I might be missing something completely obvious or trivial without realizing. I've pieced together a project from a couple of examples from the Android Wear doc pages and from the TwoToasters example on github. I just want to get data communication set up between the devices so that I can then edit the code in order to display images from my tablet on my Wear device. Ultimately, I want to be able to start/stop a slideshow on my Wear device from my tablet but I should be able to get there on my own once I get the data communication protocol set up and working so I'm really just looking for help with that. Here is my code so far:

移动：

package com.example.administrator.moto360displaycontrol;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
import android.widget.ToggleButton;

import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.wearable.Asset;
import com.google.android.gms.wearable.DataApi;
import com.google.android.gms.wearable.Node;
import com.google.android.gms.wearable.NodeApi;
import com.google.android.gms.wearable.PutDataMapRequest;
import com.google.android.gms.wearable.PutDataRequest;
import com.google.android.gms.wearable.Wearable;

import java.io.ByteArrayOutputStream;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class MainActivity extends Activity {

    private static final long CONNECTION_TIME_OUT_MS = 100;
    private static final String ON_MESSAGE = "On!";
    private static final String OFF_MESSAGE = "Off!";
    private String message = null;
    int count = 0;

    private GoogleApiClient client;
    private String nodeId;

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

        initApi();
        setupWidgets();
    }

    /**
     * Initializes the GoogleApiClient and gets the Node ID of the connected device.
     */
    private void initApi() {
        client = getGoogleApiClient(this);
        retrieveDeviceNode();
    }

    /**
     * Returns a GoogleApiClient that can access the Wear API.
     * @param context
     * @return A GoogleApiClient that can make calls to the Wear API
     */
    private GoogleApiClient getGoogleApiClient(Context context) {
        return new GoogleApiClient.Builder(context)
            .addApi(Wearable.API)
            .build();
    }

    /**
     * Connects to the GoogleApiClient and retrieves the connected device's Node ID. If there are
     * multiple connected devices, the first Node ID is returned.
     */
    private void retrieveDeviceNode() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                client.blockingConnect(CONNECTION_TIME_OUT_MS, TimeUnit.MILLISECONDS);
                NodeApi.GetConnectedNodesResult result =
                        Wearable.NodeApi.getConnectedNodes(client).await();
                List<Node> nodes = result.getNodes();
                if (nodes.size() > 0) {
                    nodeId = nodes.get(0).getId();
                }
                client.disconnect();
            }
        }).start();
    }

    /**
     * Sets up the button for handling click events.`
     */
    private void setupWidgets() {
        findViewById(R.id.toggleButton).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image);
                Asset asset = createAssetFromBitmap(bitmap);
                PutDataRequest request = PutDataRequest.create("/image");
                request.putAsset("profileImage", asset);
                Wearable.DataApi.putDataItem(client, request);
                showToast("SentData");
            }
        });
    }

    private static Asset createAssetFromBitmap(Bitmap bitmap) {
        final ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteStream);
        return Asset.createFromBytes(byteStream.toByteArray());
    }

    public void showToast(String string) {
        Toast.makeText(this, string, Toast.LENGTH_LONG).show();
    }
}

磨损：

package com.example.administrator.moto360displaycontrol;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.wearable.Asset;
import com.google.android.gms.wearable.DataApi;
import com.google.android.gms.wearable.DataEvent;
import com.google.android.gms.wearable.DataEventBuffer;
import com.google.android.gms.wearable.DataMapItem;
import com.google.android.gms.wearable.Node;
import com.google.android.gms.wearable.NodeApi;
import com.google.android.gms.wearable.Wearable;
import android.widget.Toast;

import java.io.InputStream;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class MainActivity extends Activity implements
        DataApi.DataListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener{
    private TextView mTextView;
    private static final long CONNECTION_TIME_OUT_MS = 100;
    private static final String ON_MESSAGE = "On!";
    private static final String OFF_MESSAGE = "Off!";
    private static final String TAG = "Moto360DisplayControl";
    private GoogleApiClient client;
    private String nodeId;

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

        initApi();
    }

    private void initApi() {
        client = getGoogleApiClient(this);
        retrieveDeviceNode();
    }

    private GoogleApiClient getGoogleApiClient(Context context) {
        return new GoogleApiClient.Builder(context)
            .addApi(Wearable.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
    }

    private void retrieveDeviceNode() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                client.blockingConnect(CONNECTION_TIME_OUT_MS, TimeUnit.MILLISECONDS);
                NodeApi.GetConnectedNodesResult result =
                    Wearable.NodeApi.getConnectedNodes(client).await();
                List<Node> nodes = result.getNodes();
                if (nodes.size() > 0) {
                    nodeId = nodes.get(0).getId();
                }
                client.disconnect();
            }
        }).start();
    }

    @Override
    protected void onStart() {
        super.onStart();
        client.connect();
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        Wearable.DataApi.addListener(client, this);
        Toast.makeText(this, "AddedListener!", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onConnectionSuspended(int num) {
        Toast.makeText(this, "ConnectionSuspended", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onConnectionFailed(ConnectionResult res) {
        Toast.makeText(this, "ConnectionFailed", Toast.LENGTH_LONG).show();
    }

    @Override
    protected void onStop() {
        Wearable.DataApi.removeListener(client, this);
        client.disconnect();
        super.onStop();
    }

    @Override
    public void onDataChanged(DataEventBuffer dataEvents) {
        Toast.makeText(this, "DataChanged!", Toast.LENGTH_LONG).show();
        for (DataEvent event : dataEvents) {
            if (event.getType() == DataEvent.TYPE_CHANGED && event.getDataItem().getUri().getPath().equals("/image")) {
                DataMapItem dataMapItem = DataMapItem.fromDataItem(event.getDataItem());
                Asset profileAsset = dataMapItem.getDataMap().getAsset("profileImage");
                Bitmap bitmap = loadBitmapFromAsset(profileAsset);
                // Do something with bitmap
                Toast.makeText(this, "DataChanged!", Toast.LENGTH_LONG).show();
            }
        }
    }

    public Bitmap loadBitmapFromAsset(Asset asset) {
        if (asset == null) {
            throw new IllegalArgumentException("Asset must be non-null");
        }

        ConnectionResult result = client.blockingConnect(CONNECTION_TIME_OUT_MS, TimeUnit.MILLISECONDS);
        if (!result.isSuccess()) {
            return null;
        }

        // Convert asset into a file descriptor and block until it's ready
        InputStream assetInputStream = Wearable.DataApi.getFdForAsset(client, asset).await().getInputStream();
        client.disconnect();

        if (assetInputStream == null) {
            Log.w(TAG, "Requested an unknown Asset.");
            return null;
        }

        // Decode the stream into a bitmap
        return BitmapFactory.decodeStream(assetInputStream);
    }
}

一切似乎都能成功告诉我们，但Wear的 onDataChanged方法中的Toast永远不会出现在Wear的显示屏上，这使我认为由于某种原因它没有看到数据更改。任何帮助将不胜感激！

Everything "seems" to succeed as far as I can tell but the Toast in the Wear's "onDataChanged" method never shows up on the Wear's display which makes me think it isn't seeing the data change for some reason. Any help would be greatly appreciated!

推荐答案

尝试在掌上电脑的请求中添加时间戳，它为我解决了问题然后，我认为Google更新了他们的文档，添加了一些信息

Try adding a timestamp to your request on the handheld, it did the trick for me back then, and I think Google updated their documentations adding this bit of info

这篇关于尝试将数据从Android Tablet发送到Android Wear设备并丢失的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！