create BaseActivity

app/src/main/java/io/legado/app/base/BaseActivity.kt

@@ -2,19 +2,28 @@ package io.legado.app.base
 
 import android.os.Bundle
 import android.view.MenuItem
-import androidx.annotation.LayoutRes
 import androidx.appcompat.app.AppCompatActivity
+import androidx.databinding.DataBindingUtil
+import androidx.databinding.ViewDataBinding
+import androidx.lifecycle.ViewModel
 
-abstract class BaseActivity : AppCompatActivity() {
+abstract class BaseActivity<BD : ViewDataBinding, VM : ViewModel> : AppCompatActivity() {
 
-    @LayoutRes
+    protected lateinit var dataBinding: BD
-    abstract fun getLayoutID(): Int
+        private set
+
+    protected abstract val viewModel: VM
+
+    protected abstract val layoutID: Int
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(getLayoutID())
+        dataBinding = DataBindingUtil.setContentView(this, layoutID)
+        onViewModelCreated(viewModel, savedInstanceState)
     }
 
+    abstract fun onViewModelCreated(viewModel: VM, savedInstanceState: Bundle?)
+
     override fun onOptionsItemSelected(item: MenuItem?): Boolean {
         item?.let {
             if (it.itemId == android.R.id.home) {
@@ -22,7 +31,7 @@ abstract class BaseActivity : AppCompatActivity() {
                 return true
             }
         }
-        return if (item == null) true else onCompatOptionsItemSelected(item)
+        return if (item == null) false else onCompatOptionsItemSelected(item)
     }
 
     open fun onCompatOptionsItemSelected(item: MenuItem): Boolean {
@@ -30,26 +39,18 @@ abstract class BaseActivity : AppCompatActivity() {
     }
 
     override fun setTitle(title: CharSequence?) {
-        supportActionBar?.let {
+        supportActionBar?.title = title
-            it.title = title
-        }
     }
 
     override fun setTitle(titleId: Int) {
-        supportActionBar?.let {
+        supportActionBar?.setTitle(titleId)
-            it.setTitle(titleId)
-        }
     }
 
     fun setSubTitle(subtitle: CharSequence?) {
-        supportActionBar?.let {
+        supportActionBar?.subtitle = subtitle
-            it.subtitle = subtitle;
-        }
     }
 
     fun setSubTitle(subtitleId: Int) {
-        supportActionBar?.let {
+        supportActionBar?.setSubtitle(subtitleId)
-            it.setSubtitle(subtitleId)
-        }
     }
 }

app/src/main/java/io/legado/app/ui/widget/TitleBar.kt

@@ -1,24 +1,46 @@
 package io.legado.app.ui.widget
 
 import android.content.Context
+import android.content.res.ColorStateList
+import android.graphics.PorterDuff
+import android.graphics.drawable.Drawable
 import android.util.AttributeSet
-import android.widget.FrameLayout
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.graphics.drawable.DrawableCompat
+import com.google.android.material.appbar.AppBarLayout
 import io.legado.app.R
 import kotlinx.android.synthetic.main.view_titlebar.view.*
 
-class TitleBar(context: Context, attrs: AttributeSet?) : FrameLayout(context, attrs) {
+class TitleBar(context: Context, attrs: AttributeSet?) : AppBarLayout(context, attrs) {
 
     init {
         inflate(context, R.layout.view_titlebar, this)
+        val a = context.obtainStyledAttributes(
+            attrs, R.styleable.TitleBar,
+            0, 0
+        )
+        val navigationIcon = a.getDrawable(R.styleable.TitleBar_navigationIcon)
+        val navigationContentDescription = a.getText(R.styleable.TitleBar_navigationContentDescription)
+        val navigationIconTint = a.getColorStateList(R.styleable.TitleBar_navigationIconTint)
+        val navigationIconTintMode = a.getInt(R.styleable.TitleBar_navigationIconTintMode, 9)
+        val showNavigationIcon = a.getBoolean(R.styleable.TitleBar_showNavigationIcon, true)
+        val attachToActivity = a.getBoolean(R.styleable.TitleBar_attachToActivity, true)
+        a.recycle()
+
+        if (showNavigationIcon) {
+            toolbar.apply {
+                this.navigationIcon = navigationIcon
+                this.navigationContentDescription = navigationContentDescription
+                wrapDrawableTint(this.navigationIcon, navigationIconTint, navigationIconTintMode)
+            }
         }
 
-    override fun onAttachedToWindow() {
+        if (attachToActivity) {
-        super.onAttachedToWindow()
+            attachToActivity(context)
-        attachToActivity()
+        }
     }
 
-    private fun attachToActivity(){
+    private fun attachToActivity(context: Context) {
         val activity = getCompatActivity(context)
         activity?.let {
             activity.setSupportActionBar(toolbar)
@@ -37,4 +59,35 @@ class TitleBar(context: Context, attrs: AttributeSet?) : FrameLayout(context, at
             else -> null
         }
     }
+
+    private fun wrapDrawableTint(drawable: Drawable?, tintList: ColorStateList?, tintMode: Int) {
+        if (drawable == null || tintList == null) return
+        val wrappedDrawable = DrawableCompat.wrap(drawable.mutate())
+        DrawableCompat.setTintList(wrappedDrawable, tintList)
+        DrawableCompat.setTintMode(wrappedDrawable, intToMode(tintMode))
+    }
+
+    private fun intToMode(`val`: Int): PorterDuff.Mode {
+        when (`val`) {
+            0 -> return PorterDuff.Mode.CLEAR
+            1 -> return PorterDuff.Mode.SRC
+            2 -> return PorterDuff.Mode.DST
+            3 -> return PorterDuff.Mode.SRC_OVER
+            4 -> return PorterDuff.Mode.DST_OVER
+            5 -> return PorterDuff.Mode.SRC_IN
+            6 -> return PorterDuff.Mode.DST_IN
+            7 -> return PorterDuff.Mode.SRC_OUT
+            8 -> return PorterDuff.Mode.DST_OUT
+            9 -> return PorterDuff.Mode.SRC_ATOP
+            10 -> return PorterDuff.Mode.DST_ATOP
+            11 -> return PorterDuff.Mode.XOR
+            16 -> return PorterDuff.Mode.DARKEN
+            17 -> return PorterDuff.Mode.LIGHTEN
+            13 -> return PorterDuff.Mode.MULTIPLY
+            14 -> return PorterDuff.Mode.SCREEN
+            12 -> return PorterDuff.Mode.ADD
+            15 -> return PorterDuff.Mode.OVERLAY
+            else -> return PorterDuff.Mode.CLEAR
+        }
+    }
 }

app/src/main/java/io/legado/app/ui/widget/dynamiclayout/DynamicFrameLayout.kt

@@ -0,0 +1,221 @@
+package io.legado.app.ui.widget.dynamiclayout
+
+import android.content.Context
+import android.graphics.drawable.Drawable
+import android.util.AttributeSet
+import android.view.View
+import android.view.ViewGroup
+import android.widget.FrameLayout
+import android.widget.ProgressBar
+import androidx.appcompat.widget.AppCompatButton
+import androidx.appcompat.widget.AppCompatImageView
+import androidx.appcompat.widget.AppCompatTextView
+import io.legado.app.R
+import kotlinx.android.synthetic.main.view_dynamic.view.*
+
+class DynamicFrameLayout(context: Context, attrs: AttributeSet?) : FrameLayout(context, attrs), ViewSwitcher {
+
+    private var errorView: View? = null
+    private var errorImage: AppCompatImageView? = null
+    private var errorTextView: AppCompatTextView? = null
+    private var actionBtn: AppCompatButton? = null
+
+    private var progressView: View? = null
+    private var progressBar: ProgressBar? = null
+
+    private var contentView: View? = null
+
+    private var errorIcon: Drawable? = null
+    private var emptyIcon: Drawable? = null
+
+    private var errorActionDescription: CharSequence? = null
+    private var emptyActionDescription: CharSequence? = null
+    private var emptyDescription: CharSequence? = null
+
+    private var errorAction: Action? = null
+    private var emptyAction: Action? = null
+
+    private var changeListener: OnVisibilityChangeListener? = null
+
+    init {
+        View.inflate(context, R.layout.view_dynamic, this)
+
+        val a = context.obtainStyledAttributes(attrs, R.styleable.DynamicFrameLayout)
+        errorIcon = a.getDrawable(R.styleable.DynamicFrameLayout_errorSrc)
+        emptyIcon = a.getDrawable(R.styleable.DynamicFrameLayout_emptySrc)
+
+        emptyActionDescription = a.getText(R.styleable.DynamicFrameLayout_emptyActionDescription)
+        emptyDescription = a.getText(R.styleable.DynamicFrameLayout_emptyDescription)
+
+        errorActionDescription = a.getText(R.styleable.DynamicFrameLayout_errorActionDescription)
+        if (errorActionDescription == null) {
+            errorActionDescription = context.getString(R.string.dynamic_click_retry)
+        }
+        a.recycle()
+    }
+
+    override fun onFinishInflate() {
+        super.onFinishInflate()
+        if (childCount > 2) {
+            contentView = getChildAt(2)
+        }
+    }
+
+    override fun addView(child: View) {
+        if (childCount > 2) {
+            throw IllegalStateException("DynamicFrameLayout can host only one direct child")
+        }
+
+        super.addView(child)
+    }
+
+    override fun addView(child: View, index: Int) {
+        if (childCount > 2) {
+            throw IllegalStateException("DynamicFrameLayout can host only one direct child")
+        }
+
+        super.addView(child, index)
+    }
+
+    override fun addView(child: View, params: ViewGroup.LayoutParams) {
+        if (childCount > 2) {
+            throw IllegalStateException("DynamicFrameLayout can host only one direct child")
+        }
+
+        super.addView(child, params)
+    }
+
+    override fun addView(child: View, index: Int, params: ViewGroup.LayoutParams) {
+        if (childCount > 2) {
+            throw IllegalStateException("DynamicFrameLayout can host only one direct child")
+        }
+
+        super.addView(child, index, params)
+    }
+
+    override fun showErrorView(message: CharSequence) {
+        ensureErrorView()
+
+        setViewVisible(errorView, true)
+        setViewVisible(contentView, false)
+        setViewVisible(progressView, false)
+
+        errorTextView?.text = message
+        errorImage?.setImageDrawable(errorIcon)
+
+        actionBtn?.let {
+            it.tag = ACTION_WHEN_ERROR
+            it.visibility = View.VISIBLE
+            if (errorActionDescription != null) {
+                it.text = errorActionDescription
+            }
+        }
+
+        dispatchVisibilityChanged(ViewSwitcher.SHOW_ERROR_VIEW)
+    }
+
+    override fun showErrorView(messageId: Int) {
+        showErrorView(resources.getText(messageId))
+    }
+
+    override fun showEmptyView() {
+        ensureErrorView()
+
+        setViewVisible(errorView, true)
+        setViewVisible(contentView, false)
+        setViewVisible(progressView, false)
+
+        errorTextView?.text = emptyDescription
+        errorImage?.setImageDrawable(emptyIcon)
+
+        actionBtn?.let {
+            it.tag = ACTION_WHEN_EMPTY
+            if (errorActionDescription != null) {
+                it.visibility = View.VISIBLE
+                it.text = errorActionDescription
+            } else {
+                it.visibility = View.INVISIBLE
+            }
+        }
+
+        dispatchVisibilityChanged(ViewSwitcher.SHOW_EMPTY_VIEW)
+    }
+
+    override fun showProgressView() {
+        ensureProgressView()
+
+        setViewVisible(errorView, false)
+        setViewVisible(contentView, false)
+        setViewVisible(progressView, true)
+
+        dispatchVisibilityChanged(ViewSwitcher.SHOW_PROGRESS_VIEW)
+    }
+
+    override fun showContentView() {
+        setViewVisible(errorView, false)
+        setViewVisible(contentView, true)
+        setViewVisible(progressView, false)
+
+        dispatchVisibilityChanged(ViewSwitcher.SHOW_CONTENT_VIEW)
+    }
+
+    fun setOnVisibilityChangeListener(listener: OnVisibilityChangeListener) {
+        changeListener = listener
+    }
+
+    fun setErrorAction(action: Action) {
+        errorAction = action
+    }
+
+    fun setEmptyAction(action: Action) {
+        emptyAction = action
+    }
+
+    private fun setViewVisible(view: View?, visible: Boolean) {
+        view?.let {
+            it.visibility = if (visible) View.VISIBLE else View.INVISIBLE
+        }
+    }
+
+    private fun ensureErrorView() {
+        if (errorView == null) {
+            errorView = errorViewStub.inflate()
+            errorImage = errorView?.findViewById(R.id.iv_error_image)
+            errorTextView = errorView?.findViewById(R.id.tv_error_message)
+            actionBtn = errorView?.findViewById(R.id.btn_error_retry)
+
+            actionBtn?.setOnClickListener {
+                when (it.tag) {
+                    ACTION_WHEN_EMPTY -> emptyAction?.onAction(this@DynamicFrameLayout)
+                    ACTION_WHEN_ERROR -> errorAction?.onAction(this@DynamicFrameLayout)
+                }
+            }
+        }
+    }
+
+    private fun ensureProgressView() {
+        if (progressView == null) {
+            progressView = progressViewStub.inflate()
+            progressBar = progressView?.findViewById(R.id.loading_progress)
+        }
+    }
+
+    private fun dispatchVisibilityChanged(@ViewSwitcher.Visibility visibility: Int) {
+        changeListener?.onVisibilityChanged(visibility)
+    }
+
+    interface Action {
+        fun onAction(switcher: ViewSwitcher)
+    }
+
+
+    interface OnVisibilityChangeListener {
+
+        fun onVisibilityChanged(@ViewSwitcher.Visibility visibility: Int)
+    }
+
+    companion object {
+        private const val ACTION_WHEN_ERROR = "ACTION_WHEN_ERROR"
+        private const val ACTION_WHEN_EMPTY = "ACTION_WHEN_EMPTY"
+    }
+}

app/src/main/java/io/legado/app/ui/widget/dynamiclayout/ViewSwitcher.kt

@@ -0,0 +1,29 @@
+package io.legado.app.ui.widget.dynamiclayout
+
+import androidx.annotation.IntDef
+import androidx.annotation.StringRes
+
+interface ViewSwitcher {
+
+   companion object{
+       const val SHOW_CONTENT_VIEW = 0
+       const val SHOW_ERROR_VIEW = 1
+       const val SHOW_EMPTY_VIEW = 2
+       const val SHOW_PROGRESS_VIEW = 3
+   }
+
+    @Retention(AnnotationRetention.SOURCE)
+    @IntDef(SHOW_CONTENT_VIEW, SHOW_ERROR_VIEW, SHOW_EMPTY_VIEW, SHOW_PROGRESS_VIEW)
+    annotation class Visibility
+
+    fun showErrorView(message: CharSequence)
+
+    fun showErrorView(@StringRes messageId: Int)
+
+    fun showEmptyView()
+
+    fun showProgressView()
+
+    fun showContentView()
+
+}

app/src/main/res/layout/view_dynamic.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ViewStub
+        android:id="@+id/errorViewStub"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout="@layout/view_error" />
+
+    <ViewStub
+        android:id="@+id/progressViewStub"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout="@layout/view_loading" />
+
+</merge>

app/src/main/res/layout/view_error.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:gravity="center_horizontal"
+    android:orientation="vertical">
+
+    <androidx.appcompat.widget.AppCompatImageView
+        android:id="@+id/iv_error_image"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"/>
+
+    <androidx.appcompat.widget.AppCompatTextView
+        android:id="@+id/tv_error_message"
+        style="@style/Style.Text.Primary.Normal"
+        android:paddingTop="16dp"
+        android:paddingBottom="16dp" />
+
+    <androidx.appcompat.widget.AppCompatButton
+        android:id="@+id/btn_error_retry"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:backgroundTint="@color/colorAccent"
+        android:minWidth="96dp"
+        android:text="@string/dynamic_click_retry" />
+
+</LinearLayout>

app/src/main/res/layout/view_loading.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:layout_width="wrap_content"
+              android:layout_height="wrap_content"
+              android:gravity="center_horizontal"
+              android:orientation="vertical">
+
+    <androidx.core.widget.ContentLoadingProgressBar
+            android:id="@+id/loading_progress"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            style="@style/Widget.AppCompat.ProgressBar"/>
+
+    <androidx.appcompat.widget.AppCompatTextView
+            android:id="@+id/tv_loading_message"
+            style="@style/Style.Text.Second.Normal.Wrap"
+            android:paddingTop="16dp"
+            android:text="@string/dynamic_loading"/>
+</LinearLayout>

app/src/main/res/layout/view_titlebar.xml

@@ -1,16 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<com.google.android.material.appbar.AppBarLayout
+<androidx.appcompat.widget.Toolbar
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
-        android:id="@+id/appBar"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:theme="@style/AppTheme.AppBarOverlay">
-
-    <androidx.appcompat.widget.Toolbar
         android:id="@+id/toolbar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         app:popupTheme="@style/AppTheme.PopupOverlay"/>
-
-</com.google.android.material.appbar.AppBarLayout>

app/src/main/res/values/attrs.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    
+    <declare-styleable name="TitleBar">
+        <attr name="attachToActivity" format="boolean" />
+        <attr name="showNavigationIcon" format="boolean" />
+        <attr name="navigationIcon" format="reference" />
+        <attr name="navigationContentDescription" format="reference|string" />
+        <attr name="navigationIconTint" format="color|reference" />
+        <attr name="navigationIconTintMode" format="enum">
+            <enum name="clear" value="0" />
+            <enum name="src" value="1" />
+            <enum name="dst" value="2" />
+            <enum name="src_over" value="3" />
+            <enum name="dst_over" value="4" />
+            <enum name="src_in" value="5" />
+            <enum name="dst_in" value="6" />
+            <enum name="src_out" value="7" />
+            <enum name="dst_out" value="8" />
+            <enum name="src_atop" value="9" />
+            <enum name="dst_atop" value="10" />
+            <enum name="xor" value="11" />
+            <enum name="darken" value="16" />
+            <enum name="lighten" value="17" />
+            <enum name="multiply" value="13" />
+            <enum name="screen" value="14" />
+            <enum name="add" value="12" />
+            <enum name="overlay" value="15" />
+        </attr>
+    </declare-styleable>
+
+    <declare-styleable name="DynamicFrameLayout">
+        <attr name="errorSrc" format="reference" />
+        <attr name="emptySrc" format="reference" />
+        <attr name="errorActionDescription" format="string|reference" />
+        <attr name="emptyActionDescription" format="string|reference" />
+        <attr name="emptyDescription" format="string|reference" />
+    </declare-styleable>
+    
+</resources>

app/src/main/res/values/colors.xml

@@ -3,4 +3,6 @@
     <color name="colorPrimary">#008577</color>
     <color name="colorPrimaryDark">#00574B</color>
     <color name="colorAccent">#D81B60</color>
+
+
 </resources>

app/src/main/res/values/dimens.xml

@@ -5,4 +5,9 @@
     <dimen name="nav_header_vertical_spacing">8dp</dimen>
     <dimen name="nav_header_height">176dp</dimen>
     <dimen name="fab_margin">16dp</dimen>
+
+
+    <dimen name="font_size_normal">14sp</dimen>
+    <dimen name="font_size_middle">16sp</dimen>
+    <dimen name="font_size_large">18sp</dimen>
 </resources>

app/src/main/res/values/strings.xml

@@ -13,4 +13,8 @@
     <string name="menu_tools">Tools</string>
     <string name="menu_share">Share</string>
     <string name="menu_send">Send</string>
+
+
+    <string name="dynamic_click_retry">点击重试</string>
+    <string name="dynamic_loading">正在加载</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -14,4 +14,28 @@
     <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar"/>
     <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light"/>
 
+
+    <style name="Style.Text.Primary.Normal" parent="android:Widget">
+        <item name="android:layout_width">match_parent</item>
+        <item name="android:layout_height">wrap_content</item>
+        <item name="android:textSize">@dimen/font_size_normal</item>
+        <item name="android:textColor">#000</item>
+        <item name="android:includeFontPadding">false</item>
+    </style>
+
+    <style name="Style.Text.Primary.Normal.Wrap">
+        <item name="android:layout_width">wrap_content</item>
+    </style>
+
+    <style name="Style.Text.Second.Normal" parent="android:Widget">
+        <item name="android:layout_width">match_parent</item>
+        <item name="android:layout_height">wrap_content</item>
+        <item name="android:textSize">@dimen/font_size_normal</item>
+        <item name="android:textColor">#676767</item>
+        <item name="android:includeFontPadding">false</item>
+    </style>
+
+    <style name="Style.Text.Second.Normal.Wrap">
+        <item name="android:layout_width">wrap_content</item>
+    </style>
 </resources>