init

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    namespace 'com.lizongying.mytv'
+    compileSdk 33
+
+    defaultConfig {
+        applicationId "com.lizongying.mytv"
+        minSdk 23
+        targetSdk 33
+        versionCode 1
+        versionName "1.0"
+
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget=17
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.11.0-beta02'
+    implementation 'androidx.leanback:leanback:1.0.0'
+    implementation 'com.github.bumptech.glide:glide:4.11.0'
+    implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.6.2"
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.0-RC")
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.MyTV">
+        <activity
+            android:name=".MainActivity"
+            android:banner="@drawable/tv"
+            android:exported="true"
+            android:icon="@drawable/tv"
+            android:label="@string/app_name"
+            android:logo="@drawable/tv"
+            android:screenOrientation="landscape">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+    <uses-feature
+        android:name="android.software.leanback"
+        android:required="true" />
+    <uses-feature
+        android:name="android.hardware.touchscreen"
+        android:required="false" />
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+</manifest>

app/src/main/java/com/lizongying/mytv/CardPresenter.kt

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+package com.lizongying.mytv
+
+import android.graphics.Bitmap
+import android.media.MediaMetadataRetriever
+import android.util.Log
+import android.view.ContextThemeWrapper
+import android.view.ViewGroup
+import androidx.core.content.ContextCompat
+import androidx.leanback.widget.ImageCardView
+import androidx.leanback.widget.Presenter
+import androidx.lifecycle.LifecycleCoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlin.properties.Delegates
+
+
+/**
+ * A CardPresenter is used to generate Views and bind Objects to them on demand.
+ * It contains an ImageCardView.
+ */
+class CardPresenter(private val lifecycleScope: LifecycleCoroutineScope) : Presenter() {
+
+    override fun onCreateViewHolder(parent: ViewGroup): ViewHolder {
+        Log.d(TAG, "onCreateViewHolder")
+
+        val cardView = object :
+            ImageCardView(ContextThemeWrapper(parent.context, R.style.CustomImageCardTheme)) {
+            override fun setSelected(selected: Boolean) {
+//                updateCardBackgroundColor(this)
+                super.setSelected(selected)
+            }
+        }
+
+        cardView.isFocusable = true
+        cardView.isFocusableInTouchMode = true
+        return ViewHolder(cardView)
+    }
+
+    override fun onBindViewHolder(viewHolder: ViewHolder, item: Any) {
+        val tv = item as TV
+        val cardView = viewHolder.view as ImageCardView
+
+        Log.d(TAG, "onBindViewHolder")
+        if (tv.videoUrl != null) {
+            cardView.titleText = tv.title
+            cardView.setMainImageDimensions(CARD_WIDTH, CARD_HEIGHT)
+            cardView.tag = tv.videoUrl
+
+//            lifecycleScope.launch(Dispatchers.IO) {
+//                val videoThumbnail = tv.videoUrl?.let { getVideoThumbnail(it) }
+//
+//                withContext(Dispatchers.Main) {
+//                    cardView.mainImageView.setImageBitmap(videoThumbnail)
+//                }
+//            }
+        }
+    }
+
+    override fun onUnbindViewHolder(viewHolder: ViewHolder) {
+        Log.d(TAG, "onUnbindViewHolder")
+        val cardView = viewHolder.view as ImageCardView
+        // Remove references to images so that the garbage collector can free up memory
+        cardView.badgeImage = null
+        cardView.mainImage = null
+    }
+
+    private fun updateCardBackgroundColor(view: ImageCardView) {
+        val currentTag = view.tag
+        lifecycleScope.launch(Dispatchers.IO) {
+            delay(1000)
+            if (view.isSelected && view.tag != null && currentTag == view.tag) {
+                val videoThumbnail = view.tag.toString().let { getVideoThumbnail(it) }
+                withContext(Dispatchers.Main) {
+                    if (view.isSelected && currentTag == view.tag) {
+                        view.mainImageView.setImageBitmap(videoThumbnail)
+                    }
+                }
+            }
+        }
+    }
+
+    private fun getVideoThumbnail(url: String): Bitmap? {
+        val mediaMetadataRetriever = MediaMetadataRetriever()
+        try {
+            val map = HashMap<String, String>()
+            mediaMetadataRetriever.setDataSource(url, map)
+            return mediaMetadataRetriever.frameAtTime
+        } catch (e: Exception) {
+            e.printStackTrace()
+        } finally {
+            mediaMetadataRetriever.release()
+        }
+        return null
+    }
+
+    companion object {
+        private const val TAG = "CardPresenter"
+
+        private const val CARD_WIDTH = 313
+
+        private const val CARD_HEIGHT = 176
+    }
+}

app/src/main/java/com/lizongying/mytv/Info.kt

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+package com.lizongying.mytv
+
+import java.io.Serializable
+
+
+data class Info(
+    var rowPosition: Int = 0,
+    var itemPosition: Int = 0,
+    var item: TV? = null,
+) : Serializable