【Android BLE】藍牙開發(fā)「防丟器」的相關(guān)知識點（三）：手機與設(shè)備之間指令傳輸

1.手機發(fā)送指令到BLE設(shè)備

手機向藍牙設(shè)備發(fā)送指令，調(diào)用的是BluetoothGatt.writeCharacteristic(BluetoothGattCharacteristic characteristic)方法，本項目中由于涉及多設(shè)備管理，故由一個統(tǒng)一的工具類來發(fā)送指令。
　　在Activity中發(fā)送指令：

public static final UUID UUID_S_EXTRA = UUID.fromString("0000ff00-0000-1000-8000-00805f9b34fb");//擴展服務(wù)
public static final UUID UUID_S_EXTRA_C = UUID.fromString("0000fff0-0000-1000-8000-00805f9b34fb");//設(shè)備設(shè)置
public static final byte[] VALUE_FIND_LIGHT_ON = {(byte) 0x03, (byte) 0x01, (byte) 0x30}; // 指示燈打開
public static final byte[] VALUE_FIND_LIGHT_OFF = {(byte) 0x03, (byte) 0x00, (byte) 0x30}; // 指示燈關(guān)閉

byte[] value = BluetoothUtils.VALUE_FIND_LIGHT_ON;
buttonView.setChecked(!isChecked);
BluetoothUtils.sendValueToBle(mMac, BluetoothUtils.UUID_S_EXTRA, BluetoothUtils.UUID_S_EXTRA_C, value);

** 發(fā)送指令時，首先根據(jù)mac找出該設(shè)備對應(yīng)的BluetoothGatt，然后發(fā)送對應(yīng)的參數(shù)。*

2.判斷指令發(fā)送是否成功

對于手機已經(jīng)發(fā)送出去的指令，如何判斷設(shè)備是否接收到并生效比較關(guān)鍵，這與很多業(yè)務(wù)相關(guān)聯(lián)。這一點，在上篇文章中也提到，我們使用BluetoothGattCallback onCharacteristicWrite來解決，設(shè)備收到指令后，會進入該回調(diào)參數(shù)，我們可以獲取被寫入指令設(shè)備的MAC，寫入的值，寫入的狀態(tài)，寫入的通道等信息，據(jù)此來判斷是否成功。

3.手機獲取BLE設(shè)備的指令

手機與設(shè)備建立連接后，可訂閱設(shè)備相應(yīng)的通道（如電量、按鍵指令等），訂閱后，方可接收到設(shè)備發(fā)送的指令信息，該信息從BluetoothGattCallback onCharacteristicRead獲取，獲取數(shù)據(jù)后的處理，可參與上篇文章。

4附錄：指令發(fā)送相關(guān)的工具類BluetoothUtils.java 

package com.powerstick.beaglepro.util;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;

import com.afap.utils.ByteUtils;
import com.powerstick.beaglepro.MyApplication;
import com.powerstick.beaglepro.services.BluetoothLeService;
import com.tencent.bugly.crashreport.BuglyLog;

import java.util.UUID;


public final class BluetoothUtils {
    public static final UUID UUID_S_IMMEDIATE = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");//立即報警
    public static final UUID UUID_S_IMMEDIATE_C_ALERT = UUID.fromString("00002a06-0000-1000-8000-00805f9b34fb");//報警級別
    public static final UUID UUID_S_BATTERY = UUID.fromString("0000180f-0000-1000-8000-00805f9b34fb");//電池
    public static final UUID UUID_S_BATTERY_C_LEVEL = UUID.fromString("00002a19-0000-1000-8000-00805f9b34fb");//電池level

    public static final UUID UUID_S_DEVICEINFO = UUID.fromString("0000180a-0000-1000-8000-00805f9b34fb");//設(shè)備信息
    public static final UUID UUID_S_DEVICEINFO_C_FIRMWARE = UUID.fromString("00002a28-0000-1000-8000-00805f9b34fb");//固件


    public static final UUID UUID_S_KEY = UUID.fromString("0000ffe0-0000-1000-8000-00805f9b34fb");//按鍵信息
    public static final UUID UUID_S_KEY_C_PRESS = UUID.fromString("0000ffe1-0000-1000-8000-00805f9b34fb");//按鍵


    public static final UUID UUID_S_EXTRA = UUID.fromString("0000ff00-0000-1000-8000-00805f9b34fb");//擴展服務(wù)
    public static final UUID UUID_S_EXTRA_C = UUID.fromString("0000fff0-0000-1000-8000-00805f9b34fb");//設(shè)備設(shè)置
    public static final UUID UUID_S_EXTRA_C_LOGIN = UUID.fromString("0000ffc0-0000-1000-8000-00805f9b34fb");//認證
    public static final UUID UUID_S_EXTRA_C_UNBIND = UUID.fromString("0000ffc1-0000-1000-8000-00805f9b34fb");//解綁
    public static final UUID UUID_S_EXTRA_C_RENAME = UUID.fromString("0000fff3-0000-1000-8000-00805f9b34fb");//重命名

    public static final byte[] VALUE_MODE_THETHER = {(byte) 0x01, (byte) 0x00, (byte) 0x10};
    public static final byte[] VALUE_MODE_FIND = {(byte) 0x01, (byte) 0x01, (byte) 0x10};

    public static final byte[] VALUE_IMMEDIATE_ON = {(byte) 2}; // 立即報警
    public static final byte[] VALUE_IMMEDIATE_OFF = {(byte) 0}; // 取消立即報警

    public static final byte[] VALUE_TETHER_BEEP_ON = {(byte) 0x02, (byte) 0x01, (byte) 0x20}; //警報打開
    public static final byte[] VALUE_TETHER_BEEP_OFF = {(byte) 0x02, (byte) 0x00, (byte) 0x20}; //警報關(guān)閉

    public static final byte[] VALUE_FIND_LIGHT_ON = {(byte) 0x03, (byte) 0x01, (byte) 0x30}; //指示燈打開
    public static final byte[] VALUE_FIND_LIGHT_OFF = {(byte) 0x03, (byte) 0x00, (byte) 0x30}; //指示燈關(guān)閉


    public static final byte[] VALUE_UNBIND = {(byte) 0x09, (byte) 0x01, (byte) 0x90};// 解綁指令


    public final static int REQUEST_ENABLE_BT = 2001;
    private final Context mActivity;
    private final BluetoothAdapter mBluetoothAdapter;

    public BluetoothUtils(final Context activity) {
        mActivity = activity;
        final BluetoothManager btManager = (BluetoothManager) mActivity.getSystemService(Context.BLUETOOTH_SERVICE);
        mBluetoothAdapter = btManager.getAdapter();
    }

    public void askUserToEnableBluetoothIfNeeded() {
        if (isBluetoothLeSupported() && (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled())) {
            final Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            ((Activity) mActivity).startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
        }
    }

    public BluetoothAdapter getBluetoothAdapter() {
        return mBluetoothAdapter;
    }

    public boolean isBluetoothLeSupported() {
        return mActivity.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE);
    }

    public boolean isBluetoothOn() {
        if (mBluetoothAdapter == null) {
            return false;
        } else {
            return mBluetoothAdapter.isEnabled();
        }
    }


    public static BluetoothLeService getBleService() {
        return MyApplication.getInstance().mBluetoothLeService;
    }


    public static boolean sendValueToBle(String mac, UUID serviceId, UUID characteristicId, byte[] value) {
        if (getBleService() == null) {
            BuglyLog.e("BluetoothUtils", "藍牙服務(wù)為null");
            return false;
        }
        boolean result = false;
        BluetoothGattService mService = getBleService().getService(mac, serviceId);
        if (mService != null) {
            BluetoothGattCharacteristic mCharacteristic = mService.getCharacteristic(characteristicId);
            if (mCharacteristic != null) {
                mCharacteristic.setValue(value);
                BuglyLog.w("BluetoothUtils", ByteUtils.byteArrayToHexString(value));
                result = getBleService().writeCharacteristic(mac, mCharacteristic);
            } else {
                BuglyLog.w("BluetoothUtils", "目標通道為NULL");
            }
        }
        return result;
    }


    public static void readCharacteristic(String mac, UUID serviceId, UUID characteristicId) {
        if (getBleService() == null) {
            return;
        }
        BluetoothGattService mService = getBleService().getService(mac, serviceId);
        if (mService != null) {
            BluetoothGattCharacteristic mCharacteristic = mService.getCharacteristic(characteristicId);
            if (mCharacteristic != null) {
                BuglyLog.w("BluetoothUtils", "讀取：" + characteristicId.toString());
                getBleService().readCharacteristic(mac, mCharacteristic);
            } else {
                BuglyLog.w("BluetoothUtils", "目標通道為NULL");
            }
        }
    }

    public static void readRemoteRssi(String mac) {
        if (getBleService() == null) {
            return;
        }
        BluetoothGatt gatt = getBleService().getGatt(mac);
        if (gatt != null) {
            gatt.readRemoteRssi();
        }
    }
}
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