Yah*_*man 5 android kotlin android-drawable android-jetpack android-jetpack-compose
我正在使用名为 HomeActivity 的新空 JC 活动测试 Jetpack Compose。我正在尝试将可绘制资源加载到我的代码中。这是我的功能:
@Composable
fun home() {
MaterialTheme(
colors = colors,
typography = typography
) {
val menuIcon = +imageResource(R.drawable.ic_baseline_menu_24)
val bottomActions = listOf<Image>()
var (drawerState, onDrawerStateChangeListener) = +state { DrawerState.Closed }
BottomDrawerLayout(drawerState = drawerState, onStateChange = onDrawerStateChangeListener, drawerContent = {
Text(text = "Drawer")
}) {
Column(
crossAxisSize = LayoutSize.Expand
) {
BottomAppBar(
navigationIcon = {
drawerState = DrawerState.Opened
AppBarIcon(icon = menuIcon, onClick = {})
},
actionData = bottomActions,
action = {
AppBarIcon(icon = it, onClick = {})
}
)
}
}
}
}
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根据 JC 网站,+imageResource(R.drawable.xyz)
应该将资源加载为 andX.uiImage
对象
imageResource
函数返回Effect<Image>
,它不会使应用程序崩溃,但我不知道如何将其解析为所需的 Image 对象AppBarIcon
一些 Logcat 输出:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.craftmyspace/com.craftmyspace.activities.HomeActivity}: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter bitmap
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
...os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter bitmap
at androidx.ui.graphics.AndroidImage.<init>(Unknown Source:2)
at androidx.ui.graphics.AndroidImageKt.imageFromResource(AndroidImage.kt:29)
at androidx.ui.res.ImageResourcesKt$imageResource$1$1.invoke(ImageResources.kt:45)
at androidx.ui.res.ImageResourcesKt$imageResource$1$1.invoke(Unknown Source:0)
at androidx.compose.ComposerKt.remember(Composer.kt:1867)
at androidx.compose.EffectsKt$memo$2.invoke(Effects.kt:287)
at androidx.compose.EffectsKt$memo$2.invoke(Unknown Source:2)
at androidx.compose.Effect.resolve(Effects.kt:106)
at androidx.compose.Effect.resolve$default(Effects.kt:843)
at androidx.compose.Effect.unaryPlus(Effects.kt:115)
at androidx.ui.res.ImageResourcesKt$imageResource$1.invoke(ImageResources.kt:45)
at androidx.ui.res.ImageResourcesKt$imageResource$1.invoke(Unknown Source:2)
at androidx.compose.Effect.resolve(Effects.kt:106)
at androidx.compose.Effect.resolve$default(Effects.kt:843)
at androidx.compose.EffectsKt.unaryPlus(Effects.kt:841)
at com.craftmyspace.activities.HomeActivityKt$home$1$1$1.invoke(HomeActivity.kt:66)
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HomeActivity.kt:66 是这个
val menuIcon = +imageResource(R.drawable.ic_baseline_menu_24)
isl*_*rmd 10
更新:Compose_version = '1.0.0-beta01'
val painter = painterResource(id = R.drawable.img)
Image(
painter = painter,
contentDescription = "Profile pic",
modifier = imageModifier,
contentScale = ContentScale.Crop
)
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更新:02/09/2020
在 compose 版本中,1.0.0-alpha01
您可以vectorResource(id = R.drawable.my_vector_resource_id)
用来加载矢量资源。
例如:Image(asset = vectorResource(id = R.drawable.my_vector_resource_id))
或Icon(asset = vectorResource(id = R.drawable.my_vector_resource_id))
旧答案
我曾经面临同样的问题,并指出imageFromResource()
和 imageResource()
无法加载矢量资源。您需要effectOf<VectorAsset>
通过提供资源 id来创建一个并用于DrawVector()
绘制矢量资产。您可以使用以下@Composable
函数来绘制矢量资源。
@Composable
fun VectorImage(@DrawableRes id: Int, tint: Color = Color.Transparent) {
val vector = +vectorResource(id)
WithDensity {
Container(
width = vector.defaultWidth.toDp(),
height = vector.defaultHeight.toDp()
) {
DrawVector(vectorImage = vector, tintColor = tint)
}
}
}
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