任务拆分、分配的前置条件：代码充分解耦（2）

在上篇文章中讲到，代码需要充分解耦，像GPS、sensor和序列化工具这些变化的东西，我们通过外面配置来驱动业务，避免使用hard code。例如：GPS我们是用百度呢还是高德呢，我们用TripSetting来设置，这个Setting可以从服务端获取到，存储到本地，那么这个Setting应该和谁绑定呢，因为GPSTracker外层是TripTracker，所有我们setting和triptracker是一对一的对应关系。

public class TripManager {

    private TripTracker mTracker;
    private TripSetting mSettings;

    public void startTrip() {
        mTracker = new TripTracker(mSettings);
        mTracker.startTracker();
    }


    public void stopTrip() {
        mTracker.stopTracker();
    }
}

在TripTracker中，我们利用Builder模式来设置参数，把GpsTracker的构造函数改成private，不让从外面进行实例化，这样就能避免参数设置问题，防止少设置参数。
 public void startTracker() {


        gpsTracker = new GpsTracker.Builder().setOnGpsChangedListener(this).
                setUserGps(true).
                setUseNetwork(true).
                setType(mSettings.gpsType).build();
        gpsTracker.startLocation();


        sensorTracker = new SensorTracker.Builder().setOnSensorChangedListener(this).
                setSensorType(mSettings.sensorTypes).
                setSamplePeriodUs(mSettings.samplingPeriodUs).build();
        sensorTracker.startSensor();

        mtripWriter = new TripWriter();
    }

GpsTrackerl里面的Builder模式
public class GpsTracker {

    private onGpsChangedListener mlistener;
    private boolean mUserGps;
    private boolean mUseNetwork;
    private int type;

    private GpsTracker(Builder builder) {
        type = builder.type;
    }

    public void startLocation() {

    }

    public void stopLocation() {

    }

    public static class GpsEntity {
        public int timestamp;
        public long lat;
        public long lan;

    }

    interface onGpsChangedListener {
        void onGpsChanged(GpsEntity gpsEntity);
    }

    public static class Builder {
        private boolean userGps;
        private boolean useNetwork;
        private int type;
        private onGpsChangedListener mlistener;


        public Builder setOnGpsChangedListener(onGpsChangedListener listener) {
            this.mlistener = listener;
            return this;
        }

        public Builder setUserGps(boolean userGps) {
            this.userGps = userGps;
            return this;
        }

        public Builder setUseNetwork(boolean useNetwork) {
            this.useNetwork = useNetwork;
            return this;
        }

        public Builder setType(int type) {
            this.type = type;
            return this;

        }

        public GpsTracker build() {
            return new GpsTracker(this);
        }
    }
}
解耦不？解耦。。。。可以分配任务了。。。哈哈