練功場 part3 sample code

[hungyanbin]

請注意這只是練功場示範過程中的產物，實際上的專案是不會這樣寫的，貼上來給大家方便邊回憶或邊搭配影片，自己動
手寫比較會有記憶喔！

package com.cardinalblue.myapplication

import android.content.Context
import android.net.ConnectivityManager
import android.os.Bundle
import android.util.Log
import com.google.android.material.floatingactionbutton.FloatingActionButton
import com.google.android.material.snackbar.Snackbar
import androidx.appcompat.app.AppCompatActivity
import android.view.Menu
import android.view.MenuItem
import androidx.core.content.ContextCompat
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.fragment_first.*

const val TAG = "MainActivity"

class MainActivity : AppCompatActivity() {
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val color = ContextCompat.getColor(this, R.color.colorAccent)
        text.setTextColor( color)

        val manager = this.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val defaultNetworkActive = manager.getActiveNetworkInfo()
        Log.i(TAG, "onCreate: ${defaultNetworkActive?.extraInfo}")
    }

    fun replaceFragment() {
        val beginTransaction = supportFragmentManager.beginTransaction()
        beginTransaction.add(R.id.container, BlankFragment.newInstance("Yanbin"))
        beginTransaction.commit()
    }

    override fun onRestart() {
        super.onRestart()
        Log.i(TAG, "onRestart: ")
    }

    override fun onResume() {
        super.onResume()
        Log.i(TAG, "onResume: ")
    }

    override fun onStart() {
        super.onStart()
        Log.i(TAG, "onStart: ")
    }

    override fun onPause() {
        super.onPause()
        Log.i(TAG, "onPause: ")
    }

    override fun onStop() {
        super.onStop()
        Log.i(TAG, "onStop: ")
    }

    override fun onDestroy() {
        Log.i(TAG, "onDestroy: ")
        super.onDestroy()
    }
    
}

package com.cardinalblue.myapplication

import androidx.lifecycle.ViewModelProviders
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup

class BlankFragment() : Fragment() {

    companion object {
        // Should only have default constructor !!!!!
        fun newInstance(name: String): Fragment {
            val bundle = Bundle()
            bundle.putString("name", name)
            return BlankFragment().apply {
                this.arguments = bundle
            }
        }

        fun newInstance2(id: Int): Fragment {
            val bundle = Bundle()
            bundle.putInt("id", id)
            return BlankFragment().apply {
                this.arguments = bundle
            }
        }
    }


    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.blank_fragment, container, false)
    }
}