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練功場 part3 sample code

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)
    }
}

練功場 part3 - Activity and Fragment samples

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)
    }
}

練功場 part 2 - Layout 程式碼範例

示範

xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="105dp"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/image"
        android:layout_width="68dp"
        android:layout_height="68dp"
        android:layout_marginStart="20dp"
        android:layout_marginTop="20dp"
        android:background="@color/colorAccent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textTitle"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="20dp"
        android:layout_marginEnd="20dp"
        android:ellipsize="end"
        android:maxLines="1"
        android:text="Challeng01"
        android:textColor="#000000"
        android:textSize="22sp"
        app:layout_constraintVertical_chainStyle="packed"
        app:layout_constraintBottom_toTopOf="@+id/textSubTitle"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/image"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textSubTitle"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="4dp"
        android:maxLines="2"
        android:text="XX of total XXfjafkljsla"
        android:textColor="#7C828A"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@id/textTitle"
        app:layout_constraintStart_toEndOf="@id/image"
        app:layout_constraintStart_toStartOf="@id/textTitle"
        app:layout_constraintTop_toBottomOf="@+id/textTitle" />

</androidx.constraintlayout.widget.ConstraintLayout>

參考來源：

截圖 2020-08-13 上午12 16 33

練習：

xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:background="#333340"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <TextView
        android:id="@+id/textTitle"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="23dp"
        android:layout_marginStart="23dp"
        android:layout_marginEnd="18dp"
        app:layout_constraintEnd_toStartOf="@id/chart"
        android:maxLines="1"
        android:textSize="22sp"
        android:textColor="#FFFFFF"
        android:text="Chart Title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"/>

    <TextView
        android:id="@+id/textSub"
        app:layout_constraintTop_toBottomOf="@id/textTitle"
        app:layout_constraintStart_toStartOf="@id/textTitle"
        android:layout_marginTop="4dp"
        android:textColor="#A6FFFFFF"
        app:layout_constraintEnd_toEndOf="@id/textTitle"
        android:text="Additional text goes here"
        android:layout_width="0dp"
        android:layout_height="wrap_content"/>

    <ImageView
        android:id="@+id/chart"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:background="@color/colorAccent"
        android:layout_marginEnd="19dp"
        android:layout_width="76dp"
        android:layout_height="37dp"/>

</androidx.constraintlayout.widget.ConstraintLayout>

參考來源：

截圖 2020-08-13 上午12 18 24

練功場 part 5 - CustomLifeCycle

CustomLifeCycle

    fun lifeCycleTest() {
        val viewModel = TodoViewModel()
        val lifeCycleOwner = MyLifeCycleOwner()

        viewModel.todoLiveData.observe(lifeCycleOwner, Observer { todos ->
            Log.i("anotherTest", "$todos ")
        })

        lifeCycleOwner.start()

        Log.i("anotherTest", "end of test")
    }

    class MyLifeCycleOwner: LifecycleOwner {

        private val lifecycleRegistry = LifecycleRegistry(this)

        init {
            lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE)
        }

        fun start() {
            lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_RESUME)
        }

        override fun getLifecycle(): Lifecycle {
            return lifecycleRegistry
        }
    }

LiveData 與 LifeCycleOwner 之間的關係可以看這份文件，請特別注意 STARTED 跟 DESTROYED 的部分

https://developer.android.com/reference/android/arch/lifecycle/LiveData#observe

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