Android BLE 蓝牙编程（四）

接上篇，我们已经实现了短震，长震的功能了～

现在我们需要实现点击后一直震动的功能

开始我的想法是再循环中不断执行write方法，然而这个办法行不通。

系统会报错。

 

那要如何实现这个想法呢？其实很简单，使用service实现轮询就行

那想到了解决方案就着手实现方法吧！！

写个服务：

package com.wbnq.ryadie.service;

import android.app.AlarmManager;
import android.app.IntentService;
import android.app.PendingIntent;
import android.app.Service;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic;
import android.content.Intent;
import android.os.IBinder;
import android.os.SystemClock;
import android.util.Log;

import com.wbnq.ryadie.HexUtil;
import com.wbnq.ryadie.OfflineApplication;
import com.wbnq.ryadie.R;
import com.wbnq.ryadie.StaticData;
import com.wbnq.ryadie.broadcast.AlarmReceiver;

import java.util.Date;

import static com.wbnq.ryadie.StaticData.GATDATA;
import static com.wbnq.ryadie.StaticData.GATPOWER;

/**
 * Created by guwei on 16-9-20.
 */
public class ReadData extends Service {

    BluetoothGatt bluetoothGatt;
    BluetoothGattCharacteristic bleGattCharacteristic;

    OfflineApplication application;
    boolean isrunning;

    public static final String TAG = "ReadData_service";

    //    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        application = (OfflineApplication) getApplication();

        isrunning = application.getIsthreadrunning();
        //这里开辟一条线程,用来执行具体的逻辑操作:
        new Thread(new Runnable() {
            @Override
            public void run() {
                Log.d("BackService", new Date().toString());
                bleGattCharacteristic = application.getCharacteristic();
                bluetoothGatt = application.getBluetoothGatt();

                if (isrunning) {
                    Log.e(TAG, "run: 开始轮询服务");
                    //向设备发送获取数据的命令
                    write(GATDATA);
                    try {
                        Thread.sleep(200);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    //向设备发送获取电量的命令
                    write(GATPOWER);
                } else {
                    Log.e(TAG, "run: 停止轮询服务");

                }
            }
        }).start();

        AlarmManager manager = (AlarmManager) getSystemService(ALARM_SERVICE);
        //这里是定时的,这里设置的是每隔两秒打印一次时间=-=,自己改
        int anHour = 20 * 1000;
        long triggerAtTime = SystemClock.elapsedRealtime() + anHour;
        Intent i = new Intent(this, AlarmReceiver.class);
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);
        manager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerAtTime, pi);
        return super.onStartCommand(intent, flags, startId);
    }

    //向设备写入命令方法
    private void write(String commond) {

        Log.i(TAG, "write: in write \t " + bluetoothGatt + "\t" + bleGattCharacteristic);

        if (bleGattCharacteristic != null && bluetoothGatt != null) {
            bleGattCharacteristic.setValue(HexUtil.hexStringToBytes(commond));
            bluetoothGatt.writeCharacteristic(bleGattCharacteristic);
            commond = null;
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.e(TAG, "onDestroy: ");
    }
}

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