Dynamic Gradient.

app/src/main/java/com/shabinder/spotiflyer/MainActivity.kt

@@ -15,19 +15,19 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.material.*
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Settings
-import androidx.compose.runtime.Composable
+import androidx.compose.runtime.*
-import androidx.compose.runtime.Providers
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.setContent
 import androidx.compose.ui.res.vectorResource
+import androidx.compose.ui.unit.dp
 import androidx.core.view.WindowCompat
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
-import androidx.navigation.NavController
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.rememberNavController
+import com.example.jetcaster.util.verticalGradientScrim
 import com.shabinder.spotiflyer.navigation.ComposeNavigation
 import com.shabinder.spotiflyer.navigation.navigateToPlatform
 import com.shabinder.spotiflyer.networking.SpotifyService
@@ -55,8 +55,7 @@ import com.shabinder.spotiflyer.utils.showDialog as showDialog1
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
 
-    private var spotifyService : SpotifyService? = null
+    private lateinit var navController: NavHostController
-    lateinit var navController: NavHostController
     @Inject lateinit var moshi: Moshi
     @Inject lateinit var spotifyServiceTokenRequest: SpotifyServiceTokenRequest
 
@@ -70,20 +69,28 @@ class MainActivity : AppCompatActivity() {
             ComposeLearnTheme {
                 Providers(AmbientContentColor provides colorOffWhite) {
                     ProvideWindowInsets {
-                        Column {
+                        val appBarColor = MaterialTheme.colors.surface.copy(alpha = 0.6f)
-                            val appBarColor = MaterialTheme.colors.surface.copy(alpha = 0.87f)
+                        navController = rememberNavController()
 
+                        val gradientColor by sharedViewModel.gradientColor.collectAsState()
+
+                        Column(
+                            modifier = Modifier.fillMaxSize().verticalGradientScrim(
+                                color = gradientColor.copy(alpha = 0.38f),
+                                startYPercentage = 1f,
+                                endYPercentage = 0f,
+                                fixedHeight = 700f,
+                            )
+                        ) {
                             // Draw a scrim over the status bar which matches the app bar
                             Spacer(
-                                Modifier.background(appBarColor).fillMaxWidth().statusBarsHeight()
+                                Modifier.background(appBarColor).fillMaxWidth()
+                                    .statusBarsHeight()
                             )
-
                             AppBar(
                                 backgroundColor = appBarColor,
                                 modifier = Modifier.fillMaxWidth()
                             )
-                            navController = rememberNavController()
-
                             ComposeNavigation(navController)
                         }
                     }
@@ -141,7 +148,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     /**
-     * Adding my own new Spotify Web Api Requests!
+     * Adding my own Spotify Web Api Requests!
      * */
     private fun implementSpotifyService(token: String) {
         val httpClient: OkHttpClient.Builder = OkHttpClient.Builder()
@@ -154,25 +161,26 @@ class MainActivity : AppCompatActivity() {
             chain.proceed(request)
         }).addInterceptor(NetworkInterceptor())
 
-        val retrofit = Retrofit.Builder()
+        val retrofit = Retrofit.Builder().run{
-            .baseUrl("https://api.spotify.com/v1/")
+            baseUrl("https://api.spotify.com/v1/")
-            .client(httpClient.build())
+            client(httpClient.build())
-            .addConverterFactory(MoshiConverterFactory.create(moshi))
+            addConverterFactory(MoshiConverterFactory.create(moshi))
-            .build()
+            build()
-
+        }
-        spotifyService = retrofit.create(SpotifyService::class.java)
+        sharedViewModel.spotifyService.value = retrofit.create(SpotifyService::class.java)
-        sharedViewModel.spotifyService.value = spotifyService
     }
 
     fun authenticateSpotify() {
-        sharedViewModel.viewModelScope.launch {
+        if(sharedViewModel.spotifyService.value == null){
-            log("Spotify Authentication","Started")
+            sharedViewModel.viewModelScope.launch {
-            val token = spotifyServiceTokenRequest.getToken()
+                log("Spotify Authentication","Started")
-            token.value?.let {
+                val token = spotifyServiceTokenRequest.getToken()
-                showDialog1("Success: Spotify Token Acquired")
+                token.value?.let {
-                implementSpotifyService(it.access_token)
+                    showDialog1("Success: Spotify Token Acquired")
+                    implementSpotifyService(it.access_token)
+                }
+                log("Spotify Token", token.value.toString())
             }
-            log("Spotify Token", token.value.toString())
         }
     }
 
@@ -227,7 +235,8 @@ fun AppBar(
                 }
             }
         },
-        modifier = modifier
+        modifier = modifier,
+        elevation = 0.dp
     )
 }
 

app/src/main/java/com/shabinder/spotiflyer/SharedViewModel.kt

@@ -17,6 +17,8 @@
 
 package com.shabinder.spotiflyer
 
+import androidx.compose.material.MaterialTheme
+import androidx.compose.ui.graphics.Color
 import androidx.hilt.lifecycle.ViewModelInject
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
@@ -25,8 +27,13 @@ import com.shabinder.spotiflyer.database.DatabaseDAO
 import com.shabinder.spotiflyer.models.PlatformQueryResult
 import com.shabinder.spotiflyer.networking.GaanaInterface
 import com.shabinder.spotiflyer.networking.SpotifyService
+import com.shabinder.spotiflyer.ui.colorPrimary
+import com.shabinder.spotiflyer.ui.colorPrimaryDark
+import com.shabinder.spotiflyer.ui.home.HomeCategory
 import dagger.hilt.android.scopes.ActivityRetainedScoped
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
 
 @ActivityRetainedScoped
 class SharedViewModel @ViewModelInject constructor(
@@ -34,6 +41,17 @@ class SharedViewModel @ViewModelInject constructor(
     val gaanaInterface : GaanaInterface,
     val ytDownloader: YoutubeDownloader
 ) : ViewModel() {
-    var intentString = MutableLiveData<String>()
+    var spotifyService = MutableStateFlow<SpotifyService?>(null)
-    var spotifyService = MutableLiveData<SpotifyService>()
+
+    private val _gradientColor = MutableStateFlow(colorPrimaryDark)
+    val gradientColor : StateFlow<Color>
+        get() = _gradientColor
+
+    fun updateGradientColor(color: Color) {
+        _gradientColor.value = color
+    }
+
+    fun resetGradient() {
+        _gradientColor.value = colorPrimaryDark
+    }
 }

app/src/main/java/com/shabinder/spotiflyer/ui/home/Home.kt

@@ -2,6 +2,7 @@ package com.shabinder.spotiflyer.ui.home
 
 import androidx.compose.foundation.*
 import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.*
@@ -21,24 +22,26 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.res.vectorResource
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.core.net.toUri
 import androidx.navigation.NavController
-import androidx.navigation.compose.navigate
-import com.shabinder.spotiflyer.MainActivity
 import com.shabinder.spotiflyer.R
+import com.shabinder.spotiflyer.database.DownloadRecord
 import com.shabinder.spotiflyer.navigation.navigateToPlatform
 import com.shabinder.spotiflyer.ui.SpotiFlyerTypography
 import com.shabinder.spotiflyer.ui.colorAccent
 import com.shabinder.spotiflyer.ui.colorPrimary
-import com.shabinder.spotiflyer.utils.mainActivity
 import com.shabinder.spotiflyer.utils.openPlatform
 import com.shabinder.spotiflyer.utils.sharedViewModel
-import com.shabinder.spotiflyer.utils.showDialog
+import dev.chrisbanes.accompanist.glide.GlideImage
+import kotlinx.coroutines.flow.StateFlow
 
 @Composable
 fun Home(navController: NavController, modifier: Modifier = Modifier) {
@@ -47,7 +50,6 @@ fun Home(navController: NavController, modifier: Modifier = Modifier) {
     Column(modifier = modifier) {
 
         val link by viewModel.link.collectAsState()
-        val selectedCategory by viewModel.selectedCategory.collectAsState()
 
         AuthenticationBanner(viewModel,modifier)
 
@@ -57,7 +59,7 @@ fun Home(navController: NavController, modifier: Modifier = Modifier) {
             navController,
             modifier
         )
-
+        val selectedCategory by viewModel.selectedCategory.collectAsState()
 
         HomeTabBar(
             selectedCategory,
@@ -68,10 +70,13 @@ fun Home(navController: NavController, modifier: Modifier = Modifier) {
 
         when(selectedCategory){
             HomeCategory.About -> AboutColumn()
-            HomeCategory.History -> HistoryColumn()
+            HomeCategory.History -> HistoryColumn(viewModel.downloadRecordList,navController)
         }
-
     }
+    //Update Download List
+    viewModel.getDownloadRecordList()
+    //reset Gradient
+    sharedViewModel.resetGradient()
 }
 
 
@@ -186,7 +191,7 @@ fun AboutColumn(modifier: Modifier = Modifier) {
         Row(
             horizontalArrangement = Arrangement.Center,
             verticalAlignment = Alignment.CenterVertically,
-            modifier = modifier.fillMaxWidth().padding(8.dp)
+            modifier = modifier.fillMaxSize().padding(8.dp).weight(1f)
         ) {
             Text(
                 text = stringResource(id = R.string.made_with_love),
@@ -206,8 +211,52 @@ fun AboutColumn(modifier: Modifier = Modifier) {
 }
 
 @Composable
-fun HistoryColumn() {
+fun HistoryColumn(
-    //TODO("Not yet implemented")
+    downloadRecordList: StateFlow<List<DownloadRecord>>,
+    navController: NavController
+) {
+    val list by downloadRecordList.collectAsState()
+
+    LazyColumn(
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+        content = {
+            items(list) {
+                DownloadRecordItem(item = it,navController = navController)
+            }
+        },
+        modifier = Modifier.padding(top = 8.dp).fillMaxSize()
+    )
+}
+
+@Composable
+fun DownloadRecordItem(item: DownloadRecord,navController: NavController) {
+    Row(verticalAlignment = Alignment.CenterVertically,modifier = Modifier.fillMaxWidth().padding(end = 8.dp)) {
+        val imgUri = item.coverUrl.toUri().buildUpon().scheme("https").build()
+        GlideImage(
+            data = imgUri,
+            //Loading Placeholder Makes Scrolling very stuttery
+//            loading = { Image(vectorResource(id = R.drawable.ic_song_placeholder)) },
+            error = { Image(vectorResource(id = R.drawable.ic_musicplaceholder)) },
+            contentScale = ContentScale.Inside,
+//            fadeIn = true,
+            modifier = Modifier.preferredHeight(75.dp).preferredWidth(90.dp)
+        )
+        Column(modifier = Modifier.padding(horizontal = 8.dp).preferredHeight(60.dp).weight(1f),verticalArrangement = Arrangement.SpaceEvenly) {
+            Text(item.name,maxLines = 1,overflow = TextOverflow.Ellipsis,style = SpotiFlyerTypography.h6,color = colorAccent)
+            Row(
+                horizontalArrangement = Arrangement.SpaceBetween,
+                verticalAlignment = Alignment.Bottom,
+                modifier = Modifier.padding(horizontal = 8.dp).fillMaxSize()
+            ){
+                Text(item.type,fontSize = 13.sp)
+                Text("Tracks: ${item.totalFiles}",fontSize = 13.sp)
+            }
+        }
+        Image(
+            imageVector = vectorResource(id = R.drawable.ic_share_open),
+            modifier = Modifier.clickable(onClick = { navController.navigateToPlatform(item.link) })
+        )
+    }
 }
 
 @Composable
@@ -236,7 +285,7 @@ fun HomeTabBar(
     TabRow(
         selectedTabIndex = selectedIndex,
         indicator = indicator,
-        modifier = modifier
+        modifier = modifier,
     ) {
         categories.forEachIndexed { index, category ->
             Tab(
@@ -289,14 +338,16 @@ fun SearchPanel(
                     RoundedCornerShape(30.dp)
                 ),
             backgroundColor = Color.Black,
-            textStyle = AmbientTextStyle.current.merge(TextStyle(fontSize = 20.sp,color = Color.White)),
+            textStyle = AmbientTextStyle.current.merge(TextStyle(fontSize = 18.sp,color = Color.White)),
             shape = RoundedCornerShape(size = 30.dp),
             activeColor = Color.Transparent,
             inactiveColor = Color.Transparent
         )
         OutlinedButton(
             modifier = Modifier.padding(12.dp).wrapContentWidth(),
-            onClick = {navController.navigateToPlatform(link)},
+            onClick = {
+                navController.navigateToPlatform(link)
+            },
             border = BorderStroke(1.dp, Brush.horizontalGradient(listOf(colorPrimary, colorAccent)))
         ){
             Text(text = "Search",style = SpotiFlyerTypography.h6,modifier = Modifier.padding(4.dp))

app/src/main/java/com/shabinder/spotiflyer/ui/home/HomeViewModel.kt

@@ -1,10 +1,17 @@
 package com.shabinder.spotiflyer.ui.home
 
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.shabinder.spotiflyer.database.DatabaseDAO
+import com.shabinder.spotiflyer.database.DownloadRecord
+import com.shabinder.spotiflyer.utils.sharedViewModel
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 
-class HomeViewModel: ViewModel() {
+class HomeViewModel : ViewModel() {
 
     private val _link = MutableStateFlow("")
     val link:StateFlow<String>
@@ -30,6 +37,21 @@ class HomeViewModel: ViewModel() {
         _selectedCategory.value = s
     }
 
+    private val _downloadRecordList = MutableStateFlow<List<DownloadRecord>>(listOf())
+    val downloadRecordList: StateFlow<List<DownloadRecord>>
+        get() = _downloadRecordList
+
+    fun getDownloadRecordList() {
+        viewModelScope.launch {
+            withContext(Dispatchers.IO){
+                _downloadRecordList.value = sharedViewModel.databaseDAO.getRecord().toMutableList()
+            }
+        }
+    }
+
+    init {
+        getDownloadRecordList()
+    }
 }
 
 enum class HomeCategory {

app/src/main/java/com/shabinder/spotiflyer/ui/tracklist/TrackList.kt

@@ -3,62 +3,123 @@ package com.shabinder.spotiflyer.ui.tracklist
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material.ExtendedFloatingActionButton
+import androidx.compose.material.Icon
+import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.res.vectorResource
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
-import androidx.compose.ui.viewinterop.viewModel
+import androidx.core.net.toUri
-import androidx.navigation.NavController
-import com.bumptech.glide.RequestManager
 import com.shabinder.spotiflyer.R
 import com.shabinder.spotiflyer.models.PlatformQueryResult
 import com.shabinder.spotiflyer.models.TrackDetails
 import com.shabinder.spotiflyer.models.spotify.Source
 import com.shabinder.spotiflyer.ui.SpotiFlyerTypography
 import com.shabinder.spotiflyer.ui.colorAccent
-import dev.chrisbanes.accompanist.glide.GlideImage
+import com.shabinder.spotiflyer.ui.utils.calculateDominantColor
+import com.shabinder.spotiflyer.utils.sharedViewModel
+import dev.chrisbanes.accompanist.coil.CoilImage
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
 
 /*
 * UI for List of Tracks to be universally used.
-* */
+**/
 @Composable
 fun TrackList(
     result: PlatformQueryResult,
     source: Source,
     modifier: Modifier = Modifier
 ){
-    LazyColumn(
+    val coroutineScope = rememberCoroutineScope()
-        verticalArrangement = Arrangement.spacedBy(8.dp),
+    Box(modifier = modifier.fillMaxSize()){
-        content = {
+        LazyColumn(
-            items(result.trackList) {
+            verticalArrangement = Arrangement.spacedBy(8.dp),
-                TrackCard(track = it)
+            content = {
-            }
+                item {
-        },
+                    CoverImage(result.title,result.coverUrl,coroutineScope)
-        modifier = Modifier.fillMaxSize()
+                }
-    )
+                items(result.trackList) {
+                    TrackCard(track = it)
+                }
+            },
+            modifier = Modifier.fillMaxSize(),
+        )
+        DownloadAllButton(
+            onClick = {},
+            modifier = Modifier.padding(bottom = 24.dp).align(Alignment.BottomCenter)
+        )
+    }
 }
 
+@Composable
+fun CoverImage(
+    title: String,
+    coverURL: String,
+    scope: CoroutineScope,
+    modifier: Modifier = Modifier,
+) {
+    Column(
+        modifier.padding(vertical = 8.dp).fillMaxWidth(),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        CoilImage(
+            data = coverURL,
+            contentScale = ContentScale.Crop,
+            loading = { Image(vectorResource(id = R.drawable.ic_musicplaceholder)) },
+            modifier = Modifier
+                .preferredWidth(210.dp)
+                .preferredHeight(230.dp)
+                .clip(MaterialTheme.shapes.medium)
+        )
+        Text(
+            text = title,
+            style = SpotiFlyerTypography.h5,
+            //color = colorAccent,
+        )
+    }
+    scope.launch { updateGradient(coverURL) }
+}
+
+@Composable
+fun DownloadAllButton(onClick: () -> Unit, modifier: Modifier = Modifier) {
+    ExtendedFloatingActionButton(
+        text = { Text("Download All") },
+        onClick = onClick,
+        icon = { Icon(imageVector = vectorResource(R.drawable.ic_download_arrow),tint = Color.Black) },
+        backgroundColor = colorAccent,
+        modifier = modifier
+    )
+}
 
 @Composable
 fun TrackCard(track:TrackDetails) {
     Row(verticalAlignment = Alignment.CenterVertically,modifier = Modifier.fillMaxWidth().padding(horizontal = 8.dp)) {
-        GlideImage(
+        val imgUri = track.albumArtURL.toUri().buildUpon().scheme("https").build()
-            data = track.albumArtURL,
+        CoilImage(
-            loading = { Image(vectorResource(id = R.drawable.ic_song_placeholder)) },
+            data = imgUri,
+            //Loading Placeholder Makes Scrolling very stuttery
+//            loading = { Image(vectorResource(id = R.drawable.ic_song_placeholder)) },
             error = { Image(vectorResource(id = R.drawable.ic_musicplaceholder)) },
             contentScale = ContentScale.Inside,
+//            fadeIn = true,
             modifier = Modifier.preferredHeight(75.dp).preferredWidth(90.dp)
         )
-        Column(modifier = Modifier.padding(horizontal = 8.dp).fillMaxHeight().weight(1f),verticalArrangement = Arrangement.SpaceBetween) {
+        Column(modifier = Modifier.padding(horizontal = 8.dp).preferredHeight(60.dp).weight(1f),verticalArrangement = Arrangement.SpaceEvenly) {
             Text(track.title,maxLines = 1,overflow = TextOverflow.Ellipsis,style = SpotiFlyerTypography.h6,color = colorAccent)
             Row(
                 horizontalArrangement = Arrangement.SpaceBetween,
-                modifier = Modifier.padding(horizontal = 12.dp).fillMaxSize()
+                verticalAlignment = Alignment.Bottom,
+                modifier = Modifier.padding(horizontal = 8.dp).fillMaxSize()
             ){
                 Text("${track.artists.firstOrNull()}...",fontSize = 13.sp)
                 Text("${track.durationSec/60} minutes, ${track.durationSec%60} sec",fontSize = 13.sp)
@@ -66,4 +127,9 @@ fun TrackCard(track:TrackDetails) {
         }
         Image(vectorResource(id = R.drawable.ic_arrow))
     }
+}
+
+suspend fun updateGradient(imageURL:String){
+    calculateDominantColor(imageURL)?.color
+        ?.let { sharedViewModel.updateGradientColor(it) }
 }

app/src/main/java/com/shabinder/spotiflyer/ui/utils/Colors.kt

@@ -0,0 +1,16 @@
+package com.shabinder.spotiflyer.ui.utils
+
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.compositeOver
+import androidx.compose.ui.graphics.luminance
+import kotlin.math.max
+import kotlin.math.min
+
+fun Color.contrastAgainst(background: Color): Float {
+    val fg = if (alpha < 1f) compositeOver(background) else this
+
+    val fgLuminance = fg.luminance() + 0.05f
+    val bgLuminance = background.luminance() + 0.05f
+
+    return max(fgLuminance, bgLuminance) / min(fgLuminance, bgLuminance)
+}

app/src/main/java/com/shabinder/spotiflyer/ui/utils/DynamicTheming.kt

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.shabinder.spotiflyer.ui.utils
+
+import android.content.Context
+import androidx.collection.LruCache
+import androidx.compose.animation.animate
+import androidx.compose.animation.core.Spring
+import androidx.compose.animation.core.spring
+import androidx.compose.material.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.AmbientContext
+import androidx.core.graphics.drawable.toBitmap
+import androidx.palette.graphics.Palette
+import coil.Coil
+import coil.request.ImageRequest
+import coil.request.SuccessResult
+import coil.size.Scale
+import com.shabinder.spotiflyer.utils.mainActivity
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+
+@Immutable
+data class DominantColors(val color: Color, val onColor: Color)
+
+
+suspend fun calculateDominantColor(url: String): DominantColors? {
+    // we calculate the swatches in the image, and return the first valid color
+    return calculateSwatchesInImage(mainActivity, url)
+        // First we want to sort the list by the color's population
+        .sortedByDescending { swatch -> swatch.population }
+        // Then we want to find the first valid color
+        .firstOrNull { swatch -> Color(swatch.rgb).contrastAgainst(Color.Black) >= 3f }
+        // If we found a valid swatch, wrap it in a [DominantColors]
+        ?.let { swatch ->
+            DominantColors(
+                color = Color(swatch.rgb),
+                onColor = Color(swatch.bodyTextColor).copy(alpha = 1f)
+            )
+        }
+}
+
+
+/**
+ * Fetches the given [imageUrl] with [Coil], then uses [Palette] to calculate the dominant color.
+ */
+suspend fun calculateSwatchesInImage(
+    context: Context,
+    imageUrl: String
+): List<Palette.Swatch> {
+    val r = ImageRequest.Builder(context)
+        .data(imageUrl)
+        // We scale the image to cover 128px x 128px (i.e. min dimension == 128px)
+        .size(128).scale(Scale.FILL)
+        // Disable hardware bitmaps, since Palette uses Bitmap.getPixels()
+        .allowHardware(false)
+        .build()
+
+    val bitmap = when (val result = Coil.execute(r)) {
+        is SuccessResult -> result.drawable.toBitmap()
+        else -> null
+    }
+
+    return bitmap?.let {
+        withContext(Dispatchers.Default) {
+            val palette = Palette.Builder(bitmap)
+                // Disable any bitmap resizing in Palette. We've already loaded an appropriately
+                // sized bitmap through Coil
+                .resizeBitmapArea(0)
+                // Clear any built-in filters. We want the unfiltered dominant color
+                .clearFilters()
+                // We reduce the maximum color count down to 8
+                .maximumColorCount(8)
+                .generate()
+
+            palette.swatches
+        }
+    } ?: emptyList()
+}

app/src/main/java/com/shabinder/spotiflyer/ui/utils/GradientScrim.kt

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.jetcaster.util
+
+import androidx.annotation.FloatRange
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.composed
+import androidx.compose.ui.draw.drawBehind
+import androidx.compose.ui.graphics.Brush
+import androidx.compose.ui.graphics.Color
+import com.shabinder.spotiflyer.utils.log
+import kotlin.math.pow
+
+/**
+ * Draws a vertical gradient scrim in the foreground.
+ *
+ * @param color The color of the gradient scrim.
+ * @param startYPercentage The start y value, in percentage of the layout's height (0f to 1f)
+ * @param endYPercentage The end y value, in percentage of the layout's height (0f to 1f)
+ * @param decay The exponential decay to apply to the gradient. Defaults to `1.0f` which is
+ * a linear gradient.
+ * @param numStops The number of color stops to draw in the gradient. Higher numbers result in
+ * the higher visual quality at the cost of draw performance. Defaults to `16`.
+ */
+fun Modifier.verticalGradientScrim(
+    color: Color,
+    @FloatRange(from = 0.0, to = 1.0) startYPercentage: Float = 0f,
+    @FloatRange(from = 0.0, to = 1.0) endYPercentage: Float = 1f,
+    decay: Float = 1.0f,
+    numStops: Int = 16,
+    fixedHeight: Float? = null
+): Modifier = composed {
+    val colors = remember(color, numStops) {
+        if (decay != 1f) {
+            // If we have a non-linear decay, we need to create the color gradient steps
+            // manually
+            val baseAlpha = color.alpha
+            List(numStops) { i ->
+                val x = i * 1f / (numStops - 1)
+                val opacity = x.pow(decay)
+                color.copy(alpha = baseAlpha * opacity)
+            }
+        } else {
+            // If we have a linear decay, we just create a simple list of start + end colors
+            listOf(color.copy(alpha = 0f), color)
+        }
+    }
+
+    var height by remember { mutableStateOf(fixedHeight ?: 0f) }
+    val brush = remember(color, numStops, startYPercentage, endYPercentage, height) {
+        Brush.verticalGradient(
+            colors = colors,
+            startY = height * startYPercentage,
+            endY = height * endYPercentage
+        )
+    }
+
+    drawBehind {
+        height = fixedHeight ?: size.height
+//        log("Height",size.height.toString())
+        drawRect(brush = brush)
+    }
+}

app/src/main/res/drawable/ic_musicplaceholder.xml

@@ -17,13 +17,13 @@
 
 <vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="300dp"
     android:height="300dp" android:viewportWidth="512" android:viewportHeight="512">
-    <path android:fillColor="#A3FFFFFF" android:pathData="m256,80a48.054,48.054 0,0 1,48 48v32h12a19.991,19.991 0,0 0,3.524 -39.671,63.984 63.984,0 0,0 -127.048,0 19.991,19.991 0,0 0,3.524 39.671h12v-32a48.054,48.054 0,0 1,48 -48z"/>
+    <path android:fillColor="#A3787878" android:pathData="m256,80a48.054,48.054 0,0 1,48 48v32h12a19.991,19.991 0,0 0,3.524 -39.671,63.984 63.984,0 0,0 -127.048,0 19.991,19.991 0,0 0,3.524 39.671h12v-32a48.054,48.054 0,0 1,48 -48z"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="m48,152a24.027,24.027 0,0 0,24 -24v-74.234l42.53,-14.176 -5.06,-15.18 -48,16a8,8 0,0 0,-5.47 7.59v57.376a24,24 0,1 0,-8 46.624zM48,120a8,8 0,1 1,-8 8,8.009 8.009,0 0,1 8,-8z"/>
+    <path android:fillColor="#A3787878" android:pathData="m48,152a24.027,24.027 0,0 0,24 -24v-74.234l42.53,-14.176 -5.06,-15.18 -48,16a8,8 0,0 0,-5.47 7.59v57.376a24,24 0,1 0,-8 46.624zM48,120a8,8 0,1 1,-8 8,8.009 8.009,0 0,1 8,-8z"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="m485.006,17.76a7.993,7.993 0,0 0,-6.741 -1.569l-72,16a8,8 0,0 0,-6.265 7.809v57.376a24,24 0,1 0,16 22.624v-73.583l56,-12.444v47.4a24,24 0,1 0,16 22.627v-80a8,8 0,0 0,-2.994 -6.24zM392,128a8,8 0,1 1,8 -8,8.009 8.009,0 0,1 -8,8zM464,112a8,8 0,1 1,8 -8,8.009 8.009,0 0,1 -8,8z"/>
+    <path android:fillColor="#A3787878" android:pathData="m485.006,17.76a7.993,7.993 0,0 0,-6.741 -1.569l-72,16a8,8 0,0 0,-6.265 7.809v57.376a24,24 0,1 0,16 22.624v-73.583l56,-12.444v47.4a24,24 0,1 0,16 22.627v-80a8,8 0,0 0,-2.994 -6.24zM392,128a8,8 0,1 1,8 -8,8.009 8.009,0 0,1 -8,8zM464,112a8,8 0,1 1,8 -8,8.009 8.009,0 0,1 -8,8z"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="m48,456h416v40h-416z"/>
+    <path android:fillColor="#A3787878" android:pathData="m48,456h416v40h-416z"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="m64,376a16,16 0,0 0,-16 16v7h48v-7a16,16 0,0 0,-16 -16z"/>
+    <path android:fillColor="#A3787878" android:pathData="m64,376a16,16 0,0 0,-16 16v7h48v-7a16,16 0,0 0,-16 -16z"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="m24,416h464v24h-464z"/>
+    <path android:fillColor="#A3787878" android:pathData="m24,416h464v24h-464z"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="M256,144m-48,0a48,48 0,1 1,96 0a48,48 0,1 1,-96 0"/>
+    <path android:fillColor="#A3787878" android:pathData="M256,144m-48,0a48,48 0,1 1,96 0a48,48 0,1 1,-96 0"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="m368,400 l16,-160h-256l16,160zM256,296a24,24 0,1 1,-24 24,24 24,0 0,1 24,-24z"/>
+    <path android:fillColor="#A3787878" android:pathData="m368,400 l16,-160h-256l16,160zM256,296a24,24 0,1 1,-24 24,24 24,0 0,1 24,-24z"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="m168,224h176a32,32 0,0 0,-32 -32h-112a32,32 0,0 0,-32 32z"/>
+    <path android:fillColor="#A3787878" android:pathData="m168,224h176a32,32 0,0 0,-32 -32h-112a32,32 0,0 0,-32 32z"/>
 </vector>

app/src/main/res/drawable/ic_share_open.xml

@@ -15,8 +15,8 @@
   ~ along with this program.  If not, see <https://www.gnu.org/licenses/>.
   -->
 
-<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="30dp"
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="32dp"
-    android:height="30dp" android:viewportWidth="512" android:viewportHeight="512">
+    android:height="32dp" android:viewportWidth="512" android:viewportHeight="512">
     <path android:fillColor="#FF3C64" android:pathData="m304,232a24,24 0,0 1,-16.971 -40.971l160,-160a24,24 0,0 1,33.942 33.942l-160,160a23.926,23.926 0,0 1,-16.971 7.029z"/>
     <path android:fillColor="#FF3B63" android:pathData="m464,200a24,24 0,0 1,-24 -24v-104h-104a24,24 0,0 1,0 -48h128a24,24 0,0 1,24 24v128a24,24 0,0 1,-24 24z"/>
     <path android:fillColor="#CE1CFF" android:pathData="m464,488h-416a24,24 0,0 1,-24 -24v-416a24,24 0,0 1,24 -24h176a24,24 0,0 1,0 48h-152v368h368v-152a24,24 0,0 1,48 0v176a24,24 0,0 1,-24 24z"/>

app/src/main/res/drawable/ic_song_placeholder.xml

@@ -17,6 +17,6 @@
 
 <vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="42dp"
     android:height="42dp" android:viewportWidth="512" android:viewportHeight="512">
-    <path android:fillColor="#A3FFFFFF" android:pathData="m511.739,103.734 l-257,50.947v233.725c-10.733,-7.199 -23.633,-11.406 -37.5,-11.406 -37.22,0 -67.5,30.28 -67.5,67.5s30.28,67.5 67.5,67.5c34.684,0 63.329,-26.299 67.073,-60h0.427v-182.682l197,-39.053v98.141c-10.733,-7.199 -23.633,-11.406 -37.5,-11.406 -37.22,0 -67.5,30.28 -67.5,67.5s30.28,67.5 67.5,67.5c39.927,0 71.547,-34.762 67.073,-75h0.427zM217.239,482c-20.678,0 -37.5,-16.822 -37.5,-37.5s16.822,-37.5 37.5,-37.5 37.5,16.822 37.5,37.5 -16.822,37.5 -37.5,37.5zM444.239,422c-20.678,0 -37.5,-16.822 -37.5,-37.5s16.822,-37.5 37.5,-37.5 37.5,16.822 37.5,37.5 -16.822,37.5 -37.5,37.5zM481.739,199.682 L284.739,238.735v-59.416l197,-39.053z"/>
+    <path android:fillColor="#A3787878" android:pathData="m511.739,103.734 l-257,50.947v233.725c-10.733,-7.199 -23.633,-11.406 -37.5,-11.406 -37.22,0 -67.5,30.28 -67.5,67.5s30.28,67.5 67.5,67.5c34.684,0 63.329,-26.299 67.073,-60h0.427v-182.682l197,-39.053v98.141c-10.733,-7.199 -23.633,-11.406 -37.5,-11.406 -37.22,0 -67.5,30.28 -67.5,67.5s30.28,67.5 67.5,67.5c39.927,0 71.547,-34.762 67.073,-75h0.427zM217.239,482c-20.678,0 -37.5,-16.822 -37.5,-37.5s16.822,-37.5 37.5,-37.5 37.5,16.822 37.5,37.5 -16.822,37.5 -37.5,37.5zM444.239,422c-20.678,0 -37.5,-16.822 -37.5,-37.5s16.822,-37.5 37.5,-37.5 37.5,16.822 37.5,37.5 -16.822,37.5 -37.5,37.5zM481.739,199.682 L284.739,238.735v-59.416l197,-39.053z"/>
-    <path android:fillColor="#A3FFFFFF" android:pathData="m182.179,159.75h30c0,-31.002 4.415,-66.799 -24.144,-95.356 -8.968,-8.968 -17.455,-16.07 -24.942,-22.336 -19.798,-16.57 -27.832,-24.012 -27.832,-42.058h-30v221.406c-10.734,-7.199 -23.634,-11.406 -37.5,-11.406 -37.22,0 -67.5,30.28 -67.5,67.5s30.28,67.5 67.5,67.5c34.684,0 63.329,-26.299 67.073,-60h0.427v-227.219c9.458,8.262 20.077,16.341 31.562,27.825 19.029,19.031 15.356,44.009 15.356,74.144zM67.761,315c-20.678,0 -37.5,-16.822 -37.5,-37.5s16.822,-37.5 37.5,-37.5 37.5,16.822 37.5,37.5 -16.823,37.5 -37.5,37.5z"/>
+    <path android:fillColor="#A3787878" android:pathData="m182.179,159.75h30c0,-31.002 4.415,-66.799 -24.144,-95.356 -8.968,-8.968 -17.455,-16.07 -24.942,-22.336 -19.798,-16.57 -27.832,-24.012 -27.832,-42.058h-30v221.406c-10.734,-7.199 -23.634,-11.406 -37.5,-11.406 -37.22,0 -67.5,30.28 -67.5,67.5s30.28,67.5 67.5,67.5c34.684,0 63.329,-26.299 67.073,-60h0.427v-227.219c9.458,8.262 20.077,16.341 31.562,27.825 19.029,19.031 15.356,44.009 15.356,74.144zM67.761,315c-20.678,0 -37.5,-16.822 -37.5,-37.5s16.822,-37.5 37.5,-37.5 37.5,16.822 37.5,37.5 -16.823,37.5 -37.5,37.5z"/>
 </vector>