android蓝牙操作

蓝牙基本操作

import android.app.Activity;import android.bluetooth.BluetoothAdapter;import android.bluetooth.BluetoothDevice;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import java.util.Set;public class BluetoothActivity extends Activity {    private static final int REQUEST_ENABLE_BT = 0x11;    private static final int REQUEST_ENABLE_DISCOVERY = 0x12;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_bluetooth);        // 得到蓝牙adapter        BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();        if (bluetoothAdapter == null) {            // 设备不支持蓝牙        }        // 打开蓝牙 - 用户是否打开蓝牙，可在onActivityResult()中判断        if (!bluetoothAdapter.isEnabled()) {            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);        }        // 查找已配对过的设备        Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();        if (pairedDevices.size() > 0) {            for (BluetoothDevice device : pairedDevices) {                // 得到设备对象device            }        }        // 发现周围的蓝牙设备 - 异步扫描周围的蓝牙设备，使用监听广播的方式，得到扫描到的设备        // 请见对象deviceReceiver        bluetoothAdapter.startDiscovery();        // 注册广播        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);        registerReceiver(deviceReceiver, filter);        // 关闭发现周围的蓝牙设备        bluetoothAdapter.cancelDiscovery();        // 当前蓝牙设备能被发现，在300秒内，可在onActivityResult()中判断用户是否同意,该方法会自动打开蓝牙        Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);        startActivityForResult(discoverableIntent, REQUEST_ENABLE_DISCOVERY);        // 得到蓝牙mac地址        bluetoothAdapter.getAddress();        // 通过蓝牙mac地址，得到蓝牙设备        BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);    }    private final BroadcastReceiver deviceReceiver = 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);                // 拿到发现得蓝牙设备对象device,注意同一台设备可能会有多次返回            }        }    };    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (resultCode == RESULT_CANCELED) {            if (requestCode == REQUEST_ENABLE_BT) {                // 用户没有打开蓝牙            } else if (requestCode == REQUEST_ENABLE_DISCOVERY) {                // 用户不想让设备被扫描到            }        } else {            if ((requestCode == REQUEST_ENABLE_BT)) {                // 用户打开了蓝牙            } else if (requestCode == REQUEST_ENABLE_DISCOVERY) {                // 用户同意设备被扫描到            }        }    }    @Override    protected void onDestroy() {        // 注销广播        unregisterReceiver(deviceReceiver);        super.onDestroy();    }}

蓝牙传输文件

使用默认的系统蓝牙应用，发送文件给另一台支持蓝牙设备

在Android系统中，使用蓝牙可以分享文件给另一台蓝牙设备，这样一种传输方式，使用的就是OBEX协议。按我的理解，所有蓝牙设备都支持OBEX协议。
在文件管理器中，可以分享文件，但是会弹出很多的分享目标：QQ,微信,蓝牙等…，若想实现这个功能，就需要直接调用蓝牙分享，下面代码使用的就是这个思路，摘录自：http://www.2cto.com/kf/201401/270305.html；

    private void sendFile(Activity activity, File file) {        PackageManager localPackageManager = activity.getPackageManager();        Intent localIntent = null;        HashMap<String, ActivityInfo> localHashMap = null;        try {            localIntent = new Intent();            localIntent.setAction(Intent.ACTION_SEND); // 设置为分享ACTION            localIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file)); // 添加传输文件            // localIntent.putExtra(Intent.EXTRA_STREAM,            // Uri.fromFile(new File(localApplicationInfo.sourceDir)));            localIntent.setType("*/*"); // 设置应用的打开方式            List<ResolveInfo> localList = localPackageManager.queryIntentActivities(                    localIntent, 0); // 查找所有可以处理该intent的            localHashMap = new HashMap<String, ActivityInfo>();            Iterator<ResolveInfo> localIterator1 = localList.iterator();            while (localIterator1.hasNext()) {                ResolveInfo resolveInfo = (ResolveInfo) localIterator1.next();                ActivityInfo localActivityInfo2 = resolveInfo.activityInfo;                String str = localActivityInfo2.applicationInfo.processName;                if (str.contains("bluetooth"))                    localHashMap.put(str, localActivityInfo2); // 添加所有包含bluetooth关键字的程序            }        } catch (Exception e) {            Toast.makeText(BluetoothShareActivity.this, "蓝牙分享异常：" + e.getMessage(), Toast.LENGTH_SHORT).show();        }        if (localHashMap.size() == 0)            Toast.makeText(BluetoothShareActivity.this, "无蓝牙设备分享", Toast.LENGTH_SHORT).show();        ActivityInfo localActivityInfo1 = (ActivityInfo) localHashMap                .get("com.android.bluetooth");        if (localActivityInfo1 == null) {            localActivityInfo1 = (ActivityInfo) localHashMap                    .get("com.mediatek.bluetooth");        }        if (localActivityInfo1 == null) {            Iterator<ActivityInfo> localIterator2 = localHashMap.values().iterator();            if (localIterator2.hasNext())                localActivityInfo1 = (ActivityInfo) localIterator2.next();        }        if (localActivityInfo1 != null) {            localIntent.setComponent(new ComponentName(                    localActivityInfo1.packageName, localActivityInfo1.name));            activity.startActivityForResult(localIntent, 4098); // 请求处理intent            return;        }    }