jetPark笔记

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SunFlower官方demo

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'


    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    
    kotlinOptions {
        jvmTarget = "1.8"
    }

SunFlower学习之UI组件

implementation "com.google.android.material:material:1.1.0"
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
implementation "androidx.viewpager2:viewpager2:1.0.0"
implementation "androidx.recyclerview:recyclerview:1.1.0"

常用组件

DrawerLayout

NavigationView

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <include
        layout="@layout/app_bar_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_main"
        app:menu="@menu/activity_main_drawer" />

</androidx.drawerlayout.widget.DrawerLayout>


appBarConfiguration = AppBarConfiguration(setOf(
                R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow), drawerLayout)
setupActionBarWithNavController(navController, appBarConfiguration)

CoordinatorLayout

AppBarLayout

CollapsingToolbarLayout

Toolbar

FloatingActionButton


<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="280dp"
        android:fitsSystemWindows="true"
        android:animateLayoutChanges="true"
        android:stateListAnimator="@animator/show_toolbar">

        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:id="@+id/toolbarLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
            app:collapsedTitleTextAppearance="@style/TextAppearance.Sunflower.Toolbar.Text"
            app:expandedTitleTextAppearance="@style/TextAppearance.Sunflower.Toolbar.Text2"
            app:statusBarScrim="@color/colorPrimary"
            android:fitsSystemWindows="true"
            android:animateLayoutChanges="true"
            app:contentScrim="@color/colorPrimary"
            app:expandedTitleGravity="left|bottom"
            app:collapsedTitleGravity="left"
            app:titleEnabled="true"
            app:toolbarId="@id/toolbar">

            <androidx.appcompat.widget.AppCompatImageView
                android:layout_width="match_parent"
                android:layout_height="280dp"
                android:scaleType="fitXY"
                app:layout_collapseMode="parallax"
                android:fitsSystemWindows="true"
                android:src="@drawable/ic_launcher_background" />

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="@android:color/transparent"
                app:contentInsetStartWithNavigation="0dp"
                android:theme="@style/ToolbarTheme"
                app:layout_collapseMode="pin" />

        </com.google.android.material.appbar.CollapsingToolbarLayout>

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.core.widget.NestedScrollView
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <include layout="@layout/content_main" />
    </androidx.core.widget.NestedScrollView>

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/fab_margin"
        app:layout_anchor="@id/appbar"
        app:layout_anchorGravity="bottom|end"
        app:srcCompat="@android:drawable/ic_dialog_email" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

viewpager2

recyclerview

BottomNavigationView

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">


    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        android:fitsSystemWindows="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/homeContent"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/nav_view"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

        val root = inflater.inflate(R.layout.fragment_home, container, false)

        val fragmentStateAdapter = object : FragmentStateAdapter(this) {
            private val tabFragmentsCreators: Map<Int, () -> Fragment> = mapOf(
                0 to { BottomHomeFragment() },
                1 to { DashboardFragment() },
                2 to { NotificationsFragment() }
            )

            override fun getItemCount() = tabFragmentsCreators.size

            override fun createFragment(position: Int): Fragment {
                return tabFragmentsCreators[position]?.invoke() ?: throw IndexOutOfBoundsException()
            }
        }
        root.homeContent.adapter = fragmentStateAdapter
        root.homeContent.registerOnPageChangeCallback(object : OnPageChangeCallback() {
            override fun onPageSelected(position: Int) {
                when (position) {
                    0 -> {
                        root.nav_view.selectedItemId = R.id.navigation_home
                    }
                    1 -> {
                        root.nav_view.selectedItemId = R.id.navigation_dashboard
                    }
                    2 -> {
                        root.nav_view.selectedItemId = R.id.navigation_notifications
                    }
                }
            }
        })

        root.nav_view.setOnNavigationItemSelectedListener {
            Log.e("nav_view", "${it.itemId}")
            when (it.itemId) {
                R.id.navigation_home -> {
                    root.homeContent.setCurrentItem(0, true)
                }
                R.id.navigation_dashboard -> {
                    root.homeContent.setCurrentItem(1, true)
                }
                R.id.navigation_notifications -> {
                    root.homeContent.setCurrentItem(2, true)
                }
                else -> {
                }
            }
            true
        }

数据库Room

    implementation "androidx.room:room-ktx:2.2.5"
    kapt "androidx.room:room-compiler:2.2.5"
     //异步任务处理
    implementation "androidx.work:work-runtime-ktx:2.3.4"

@Database(entities = [Plant::class, GardenPlanting::class], version = 1, exportSchema = false)
@TypeConverters(Converters::class)
abstract class AppDatabase : RoomDatabase() {
    abstract fun plantDao(): PlantDao
    abstract fun gardenPlantingDao(): GardenPlantingDao

    companion object {

        // For Singleton instantiation
        @Volatile
        private var instance: AppDatabase? = null

        fun getInstance(context: Context): AppDatabase {
            return instance ?: synchronized(this) {
                instance ?: buildDatabase(context).also { instance = it }
            }
        }

        // Create and pre-populate the database. See this article for more details:
        // https://medium.com/google-developers/7-pro-tips-for-room-fbadea4bfbd1#4785
        private fun buildDatabase(context: Context): AppDatabase {
            return Room.databaseBuilder(context, AppDatabase::class.java, DATABASE_NAME)
                .addCallback(object : RoomDatabase.Callback() {
                    override fun onCreate(db: SupportSQLiteDatabase) {
                        super.onCreate(db)
                        val request = OneTimeWorkRequestBuilder<SeedDatabaseWorker>().build()
                        WorkManager.getInstance(context).enqueue(request)
                    }
                })
                .build()
        }
    }
}

@Dao
interface GardenPlantingDao {
    @Query("SELECT * FROM garden_plantings")
    fun getGardenPlantings(): LiveData<List<GardenPlanting>>

    @Query("SELECT EXISTS(SELECT 1 FROM garden_plantings WHERE plant_id = :plantId LIMIT 1)")
    fun isPlanted(plantId: String): LiveData<Boolean>

    /**
     * This query will tell Room to query both the [Plant] and [GardenPlanting] tables and handle
     * the object mapping.
     */
    @Transaction
    @Query("SELECT * FROM garden_plantings")
    fun getPlantGardens(): LiveData<List<PlantAndGardenPlanting>>


    @Query("SELECT * FROM garden_plantings  WHERE plant_id = :plantId")
    fun getGardenPlanting(plantId: String): LiveData<GardenPlanting>

    @Insert
    suspend fun insertGardenPlanting(gardenPlanting: GardenPlanting): Long

    @Delete
    suspend fun deleteGardenPlanting(gardenPlanting: GardenPlanting)


    @Update
    suspend fun updateGardenPlanting(gardenPlanting: GardenPlanting)
}

设计模式MVVM

    implementation 'androidx.core:core-ktx:1.2.0'
    implementation 'androidx.fragment:fragment-ktx:1.2.3'
    
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.2.0"
    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.61"
    //协程
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0"
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0"

DataBinding

    dataBinding {
        enabled = true
    }

navigation

    implementation "androidx.navigation:navigation-fragment-ktx:2.2.1"
    implementation "androidx.navigation:navigation-ui-ktx:2.2.1"
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