Android Bluetooth蓝牙客户端发起对服务端连接建立请求过程（高版本Android兼容）

Android Bluetooth蓝牙客户端发起对服务端连接建立请求过程（高版本Android兼容）

本例代码是蓝牙客户端代码，只完成连接建立请求，假定蓝牙服务端设备名是：Android-Phone。兼容高版本Android系统。低版本则无需运行时权限申请。
package zhangphil.client;

import java.util.UUID;

import android.Manifest;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;

public class MainActivity extends Activity {

private BluetoothAdapter mBluetoothAdapter;

private final int PERMISSION_REQUEST_COARSE_LOCATION = 0xb01;

private String TAG = "zhangphil";
private String MY_UUID = "00001101-0000-1000-8000-00805F9B34FB";

// 广播接收发现蓝牙设备
private BroadcastReceiver mReceiver = new BroadcastReceiver() {

@Override
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();
Log.d(TAG, "发现设备:" + name);

if (TextUtils.equals(name, "Android-Phone")) {
Log.d(TAG, "发现目标设备，开始线程连接!");
// 蓝牙搜索是非常消耗系统资源开销的过程.
// 一旦发现了目标感兴趣的设备，可以考虑关闭扫描。
mBluetoothAdapter.cancelDiscovery();

new ClientThread(device).start();
}
}
}
}
};

private class ClientThread extends Thread {

private BluetoothDevice device;

public ClientThread(BluetoothDevice device) {
this.device = device;
}

@Override
public void run() {
BluetoothSocket socket;

try {
socket = device.createRfcommSocketToServiceRecord(UUID.fromString(MY_UUID));

Log.d(TAG, "连接服务端...");
socket.connect();
Log.d(TAG, "连接建立.");
} catch (Exception e) {
e.printStackTrace();
}
}
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (this.checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_REQUEST_COARSE_LOCATION);
}
}

mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

// 注册广播接收器。接收蓝牙发现讯息
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);

if (mBluetoothAdapter.startDiscovery()) {
Log.d(TAG, "启动蓝牙扫描设备...");
}
}

@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mReceiver);
}

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_COARSE_LOCATION:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {

}

break;
}
}
}