Android Architecture

Architecture

Typical Android apps look like this And this Here is an overview of the app prior to looking at it Looking at this I am building an app with the architecture of The was discussion on god class which I had not heard before

• Contains a high number of components
• Components are coupled
• Lengthy class

Avoid a all costs or don't cos I like getting rid of them

Design Patterns

Just a reminder of the design patterns but with maybe a more Android flare.

MVC

MVP

MVVM

Summary

Clean Architecture

Application Tidy Up

Step 1

• Created TrackerActivity which extends AppCompatActivity and will be now good for other activities
• Move Tracker to its own class and implement the Lifecycle Observer interface
• When using lifecycle observer we need to remote it on destory

    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    public void trackOnDestroy() {
        Log.d(TAG, "trackOnDestroy called");
        ((AppCompatActivity) con).getLifecycle().removeObserver(this);
        // mQueue.add(generateTrackingStringRequest("destroy"));
    }

Step 2

• Moved CoinModel, Divider and MyCryptoAdapter to their own files in recview package
• Add LocationManager, implemented lifecycle observer
• Added create and destruction of FusedLocationProviderClient in lifecyle
• Added disconnect of GoogleAPiClient and removal of lifecycle observer

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    public void init() {
        Log.d(TAG, "init() called");
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(mCon);
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public void clean() {
        Log.d(TAG, "clean() called");
        if(mGoogleApiClient !=null) {
            mGoogleApiClient.disconnect();
        }
        final LifecycleOwner lcOwner = (LifecycleOwner)mCon;
        lcOwner.getLifecycle().removeObserver(this);
        mCon = null;
    }

Step 3

• Created a LocationActivity to contain all of the logic for the runtime permission to use Location
• Add LocationManger to LocationActivity
• Change MainActivity to be derived from LocationActivity