对于Android 6.0及以上版本,可以使用Android的Nearby Connections API来实现设备间的无线连接和数据传输。首先,在作为外围设备的Android应用中调用Nearby Connections API的startAdvertising方法开始广播,并传入一个AdvertisingOptions对象,其中设置setAutoUpgradeEnabled(true)来允许自动升级传输通道。然后,在中央设备应用中调用onEndpointFound回调来发现被连接的外围设备,并使用Nearby Connections API的requestConnection方法来请求连接。如果外围设备同意连接请求,则可以在中央设备应用中调用onConnectionInitiated回调来进行连接初始化,在此回调中调用Nearby Connections API的acceptConnection方法来接受连接请求。接下来可以使用Nearby Connections API的sendPayload方法来传输数据,而无需进行配对操作。代码示例如下:
作为外围设备的Android应用:
private String mName;
private String SERVICE_ID = "com.example.service";
private AdvertisingOptions mAdvertisingOptions =
new AdvertisingOptions.Builder()
.setStrategy(Strategy.P2P_CLUSTER)
.setAutoUpgradeEnabled(true)
.build();
private ConnectionLifecycleCallback mConnectionLifecycleCallback =
new ConnectionLifecycleCallback() {
@Override
public void onConnectionInitiated(String endpointId, ConnectionInfo connectionInfo) {
Nearby.getConnectionsClient(mContext)
.acceptConnection(endpointId, new PayloadCallback() {
@Override
public void onPayloadReceived(@NonNull String s, @NonNull Payload payload) {
// 处理数据接收
}
@Override
public void onPayloadTransferUpdate(@NonNull String s, @NonNull PayloadTransferUpdate payloadTransferUpdate) {
// 更新数据传输状态
}
});
}
@Override
public void onConnectionResult(String endpointId, ConnectionResolution result) {
if (result.getStatus().isSuccess()) {
// 连接成功,可以开始数据传输
} else {
// 连接失败,处理异常
}
}
@Override
public void onDisconnected(String endpointId) {
// 断开连接,做清理工作
}
};
private void startAdvertising() {
Nearby.getConnectionsClient(mContext)
.startAdvertising(mName, SERVICE_ID, mConnectionLifecycleCallback, mAdvertisingOptions)
.addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(Void aVoid) {
// 广播成功
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
// 广播失败,处理异常
}
});
}
作为中央设备的Android应用:
private String SERVICE_ID = "com.example.service";
private EndpointDiscoveryCallback mEndpointDiscoveryCallback =
new EndpointDiscoveryCallback() {
@Override
public void onEndpointFound(String endpointId, DiscoveredEndpointInfo info) {
Nearby.getConnectionsClient(mContext)
.requestConnection(mName, endpointId, mConnectionLifecycleCallback)
.addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(Void aVoid) {
// 请求连接成功
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
// 请求连接失败,处理异常
}
});
}
@Override