最新的Android Wear更新支持使用ChannelApi来发送/接收可穿戴设备或手持设备上的文件。问题是，我找不到如何使用此功能的一个样例。Android示例中没有包含此功能。因此，如果有人知道如何使用sendFile / receiveFile并可以在此给出一个快速示例，那将不胜感激。
3个回答
7
请看这个答案，了解如何使用Channel API在设备之间创建通道。
当你创建了googleClient并获取了要发送文件的设备的nodeId后，你可以在可穿戴设备端使用以下代码：
然后，在手持设备上：
如果您需要更多关于此的信息，请访问谷歌的参考网站。
当你创建了googleClient并获取了要发送文件的设备的nodeId后，你可以在可穿戴设备端使用以下代码：
//opening channel
ChannelApi.OpenChannelResult result = Wearable.ChannelApi.openChannel(googleClient, nodeId, "/mypath").await();
channel = result.getChannel();
//sending file
channel.sendFile(googleClient, Uri.fromFile(file));
然后，在手持设备上：
//receiving the file
@Override
public void onChannelOpened(Channel channel) {
if (channel.getPath().equals("/mypath")) {
file = new File("/sdcard/file.txt");
try {
file.createNewFile();
} catch (IOException e) {
//handle error
}
channel.receiveFile(mGoogleApiClient, Uri.fromFile(file), false);
}
}
//when file is ready
@Override
public void onInputClosed(Channel channel, int i, int i1) {
MainActivity.this.runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(MainActivity.this, "File received!", Toast.LENGTH_SHORT).show();
}
});
}
如果您需要更多关于此的信息，请访问谷歌的参考网站。
- Reslley Gabriel
5
谢谢您提供的示例。我已经设置我的手机将.mp3文件发送到我的可穿戴设备端，但是我没有收到任何东西（onChannelOpened方法未被触发），我可能做错了什么？http://pastebin.com/VjfhwW51 - krakig
你如何检索手持节点的ID？ - Reslley Gabriel
1在接收文件时，有没有一种方法可以查看下载进度？ - krakig
@ReslleyGabriel 你可能需要迭代所有节点来查找节点ID。 - Foreverniu
有人在打开通道时遇到问题，但另一端没有收到OnChannelOpen()调用吗？http://stackoverflow.com/questions/39526148/android-wear-channelapi-channel-open-but-not-connecting - Hephaestus
2
这只是对答案的补充：还要检查AndroidManifest中的WearableListenerService。它的意图过滤器应包含com.google.android.gms.wearable.CHANNEL_EVENT操作。
- Richárd Bogdán
0
我曾经使用过类似这样的代码并且成功了。传输可能会相当缓慢。
手持设备和可穿戴设备应用程序在它们的 gradle 文件中必须具有相同的 applicationId。 可穿戴设备需要一个类似于这样的清单条目
<service
android:name="com.me.myWearableListenerService"
android:enabled="true"
android:exported="true">
<intent-filter>
<!-- listeners receive events that match the action and data filters -->
<action android:name="com.google.android.gms.wearable.CHANNEL_EVENT"/>
<data android:scheme="wear" android:host="*" android:pathPrefix="/MyAppPath" />
</intent-filter>
</service>
当手持设备发送文件时，启动其WearableListenerService。
private static final String WEARABLE_FILE_COPY = "MyAppPath/FileCopy";
private void copyFileToWearable (final File file, final String nodeId, Context ctx) {
new Thread(new Runnable() {
@Override
public void run() {
final ChannelClient cc = Wearable.getChannelClient(ctx);
ChannelClient.ChannelCallback ccb = new ChannelClient.ChannelCallback() {
@Override
public void onChannelClosed(@NonNull ChannelClient.Channel channel, int i, int i1) {
super.onChannelClosed(channel, i, i1);
Log.d(TAG, "copyFileToWearable " + channel.getNodeId() + " onChannelClosed ");
cc.unregisterChannelCallback(this);
}
@Override
public void onOutputClosed(@NonNull ChannelClient.Channel channel, int i, int i1) {
super.onOutputClosed(channel, i, i1);
Log.d(TAG, "copyFileToWearable " + channel.getNodeId() + " onOutputClosed ");
cc.unregisterChannelCallback(this);
// this is transfer success callback ...
}
};
ChannelClient.Channel c;
Log.d(TAG, "copyFileToWearable transfer file " + file.getName() +
" size:" + file.length()/1000000 + "Mb");
try {
// send the filename to the wearable with the channel open
c = Tasks.await(cc.openChannel(nodeId, WEARABLE_FILE_COPY + "/" + file.getName()));
Log.d(TAG, "copyFileToWearable channel opened to " + nodeId);
Log.d(TAG, "copyFileToWearable register callback");
Tasks.await(cc.registerChannelCallback(c, ccb));
Log.d(TAG, "copyFileToWearable sending file " + file.getName());
Tasks.await(cc.sendFile(c, Uri.fromFile(file)));
// completion is indicated by onOutputClosed
} catch (Exception e) {
Log.w(TAG, "copyFileToWearable exception " + e.getMessage());
cc.unregisterChannelCallback(ccb);
// failure
}
}
}).start();
}
在 WearableListenerService 的 onChannelOpened 中调用此函数，当 c.getPath() 以 WEARABLE_FILE_COPY 开头时
private void receiveFileFromHandheld(final ChannelClient.Channel c, File myStorageLocation, Context ctx) {
// filename sent by the handheld is at the end of the path
String[] bits = c.getPath().split("\\/");
// store in a suitable spot
final String receivedFileName = myStorageLocation.getAbsolutePath() + "/" + bits[bits.length-1];
new Thread(new Runnable() {
@Override
public void run() {
final ChannelClient cc = Wearable.getChannelClient(ctx);
ChannelClient.ChannelCallback ccb = new ChannelClient.ChannelCallback() {
boolean mClosed = false;
@Override
public void onChannelClosed(@NonNull ChannelClient.Channel channel, int i, int i1) {
super.onChannelClosed(channel, i, i1);
Log.d(TAG, "receiveFileFromHandheld " + channel.getNodeId() + " onChannelClosed ");
if (!mClosed){
// failure ...
}
}
@Override
public void onInputClosed(@NonNull ChannelClient.Channel channel, int i, int i1) {
super.onInputClosed(channel, i, i1);
Log.d(TAG, "receiveFileFromHandheld " + channel.getNodeId() + " onInputClosed ");
long fs = new File(receivedFileName).length();
Log.d(TAG, "receiveFileFromHandheld got " + receivedFileName +
" size:" + fs / 1000000 + "Mb");
cc.unregisterChannelCallback(this);
mClosed = true;
// success !
}
};
try {
Log.d(TAG, "receiveFileFromHandheld register callback");
Tasks.await(cc.registerChannelCallback(c, ccb));
Log.d(TAG, "receiveFileFromHandheld receiving file " + receivedFileName);
Tasks.await(cc.receiveFile(c, Uri.fromFile(new File(receivedFileName)), false));
// completion is indicated by onInputClosed
} catch (Exception e) {
Log.w(TAG, "receiveFileFromHandheld exception " + e.getMessage());
cc.unregisterChannelCallback(ccb);
// failure ...
}
}
}
).start();
}
- billChadwick
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