安卓app蓝牙传输 开发

蓝牙传输在安卓应用开发中是一种常见的数据传输方式。它可以用于不同设备之间的数据交换,如音频、图片、视频、文本等。这里我们将介绍在安卓应用中如何实现蓝牙传输。

首先,在使用蓝牙传输之前,我们需要获取蓝牙设备的权限。这可以通过以下代码来实现:

```java

private void requestBluetoothPermission() {

if (ContextCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH)

== PackageManager.PERMISSION_GRANTED) {

return;

}

ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.BLUETOOTH}, REQUEST_ENABLE_BT);

}

```

接下来启用蓝牙,可以使用以下代码:

```java

private void enableBluetooth() {

if (!bluetoothAdapter.isEnabled()) {

Intent enableBTIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

startActivityForResult(enableBTIntent, REQUEST_ENABLE_BT);

}

}

```

接着搜索附近的蓝牙设备:

```java

bluetoothAdapter.startDiscovery();

```

当发现一个蓝牙设备时,可以将其加入到列表中:

```java

private final BroadcastReceiver bluetoothReceiver = new BroadcastReceiver() {

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (BluetoothDevice.ACTION_FOUND.equals(action)) {

BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

if (device != null) {

String name = device.getName();

String macAddress = device.getAddress();

deviceList.add(new BluetoothDeviceItem(name, macAddress));

deviceListAdapter.notifyDataSetChanged();

}

}

}

};

```

在列表中选择一个设备时,可以打开一个新的Activity,并将被选中的设备传给它:

```java

public void onItemClick(AdapterView parent, View view, int position, long id) {

BluetoothDeviceItem deviceItem = deviceList.get(position);

Intent intent = new Intent(this, BluetoothChatActivity.class);

intent.putExtra(EXTRA_DEVICE, deviceItem);

startActivity(intent);

}

```

最后,在BluetoothChatActivity中,可以使用BluetoothSocket类进行数据的传输。设备之间的数据传输可以通过流来实现:

```java

private class ConnectThread extends Thread {

private BluetoothSocket socket;

private final BluetoothDevice device;

public ConnectThread(BluetoothDevice device) {

this.device = device;

}

public void run() {

try {

socket = device.createRfcommSocketToServiceRecord(MY_UUID);

socket.connect();

sendReceiveThread = new SendReceiveThread(socket);

sendReceiveThread.start();

} catch (IOException e) {

e.printStackTrace();

try {

socket.close();

} catch (IOException e1) {

e1.printStackTrace();

}

}

}

}

private class SendReceiveThread extends Thread {

private final BluetoothSocket socket;

private final InputStream inputStream;

private final OutputStream outputStream;

public SendReceiveThread(BluetoothSocket socket) {

this.socket = socket;

InputStream tempIn = null;

OutputStream tempOut = null;

try {

tempIn = socket.getInputStream();

tempOut = socket.getOutputStream();

} catch (IOException e) {

e.printStackTrace();

}

inputStream = tempIn;

outputStream = tempOut;

}

public void run() {

byte[] buffer = new byte[1024];

int bytes;

while (true) {

try {

bytes = inputStream.read(buffer);

handler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();

} catch (IOException e) {

e.printStackTrace();

break;

}

}

}

public void write(byte[] bytes) {

try {

outputStream.write(bytes);

} catch (IOException e) {

e.printStackTrace();

}

}

}

```

以上代码只是蓝牙传输的基本实现,具体的应用场景还需根据实际情况进行更改与调整。

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