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JetpackCompose从入门到实战学习笔记14——Coli的简单使用
1.简介:
Coil 是一个 Android官方出的配合Jetpack的图片加载库,通过 Kotlin 协程的方式加载图片。
优点如下:
- 更快: Coil 在性能上有很多优化,包括内存缓存和磁盘缓存,把缩略图存保存在内存中,循环利用 bitmap,自动暂停和取消图片网络请求等。
- 更轻量级: Coil 只有2000个方法(前提是你的 APP 里面集成了 OkHttp 和 Coroutines),Coil 和 Picasso 的方法数差不多,相比 Glide 和 Fresco 要轻量很多。
- 更容易使用: Coil 的 API 充分利用了 Kotlin 语言的新特性,简化和减少了很多样板代码。
- 更流行: Coil 首选 Kotlin 语言开发并且使用包含 Coroutines, OkHttp, Okio 和 AndroidX Lifecycles 在内最流行的开源库。 Coil 名字的由来:取 Coroutine Image Loader 首字母得来。
2.添加依赖:
dependencies { implementation 'androidx.core:core-ktx:1.7.0' implementation "androidx.compose.ui:ui:$compose_version" implementation 'androidx.compose.material3:material3:1.0.1' implementation "androidx.compose.ui:ui-tooling-preview:$compose_version" implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1' implementation 'androidx.activity:activity-compose:1.3.1' implementation 'androidx.compose.material:material:1.0.0-rc01' implementation "androidx.constraintlayout:constraintlayout-compose:1.0.1" testImplementation 'junit:junit:4.13.2' androidTestImplementation 'androidx.test.ext:junit:1.1.3' androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0' androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version" debugImplementation "androidx.compose.ui:ui-tooling:$compose_version" debugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version" debugImplementation "androidx.compose.ui:ui-text:$compose_version" implementation "io.coil-kt:coil-compose:2.2.2" implementation "io.coil-kt:coil-svg:2.2.2" implementation "com.github.skydoves:landscapist-coil:2.0.3" implementation "com.github.skydoves:landscapist-glide:2.1.0" implementation "com.github.skydoves:cloudy:0.1.1" implementation "io.coil-kt:coil-gif:2.3.0" implementation "com.airbnb.android:lottie-compose:$lottieVersion" }
3.Coli加载网络图片:
@Preview @Composable fun AsyncImageDemo() {
AsyncImage( model = ImageRequest.Builder(LocalContext.current) .data(ImageUrl.testUrl1) .crossfade(true) .build(), contentDescription = "compose", placeholder = painterResource(id = R.mipmap.place_holder), error = painterResource(id = R.mipmap.place_holder), onSuccess = {
Log.d(TAG, "success") }, onError = {
error -> Log.d(TAG, "error") }, onLoading = {
loading -> Log.d(TAG, "loading") }, modifier = Modifier.clip(CircleShape) ) }
4.效果预览如下:
5.异步加载图片:
@Preview @Composable fun SubcomposeAsyncImageDemo() { SubcomposeAsyncImage( model = ImageRequest .Builder(LocalContext.current) .data(ImageUrl.testUrl1) .build(), contentDescription = "compose_museum" ) { if (painter.state is AsyncImagePainter.State.Loading || painter.state is AsyncImagePainter.State.Error) { CircularProgressIndicator() } else { SubcomposeAsyncImageContent() } } }
6.效果预览:
7.网络进度加载图片:
@Preview @Composable fun AsyncImagePainterDemo() {
Column(horizontalAlignment = Alignment.CenterHorizontally) {
SubcomposeAsyncImage( model = ImageUrl.testUrl2 , loading = {
CircularProgressIndicator() }, contentDescription = null, modifier = Modifier.size(200.dp,600.dp) ) SubcomposeAsyncImage( model = ImageUrl.testUrl2 , contentDescription = null, modifier = Modifier.size(200.dp) ) {
val state = painter.state when(state) {
is AsyncImagePainter.State.Loading -> CircularProgressIndicator() is AsyncImagePainter.State.Error -> Text("${
state.result.throwable}") is AsyncImagePainter.State.Success -> SubcomposeAsyncImageContent() is AsyncImagePainter.State.Empty -> Text("Empty") } } } }
8.效果预览:
9.Coli加载圆形图片:
@Composable fun circleImageDemo() {
Column( horizontalAlignment = Alignment.CenterHorizontally ) {
Image( modifier = Modifier .fillMaxWidth() .height(500.dp), painter = rememberImagePainter( data = ImageUrl.testUrl1, builder = {
placeholder(R.mipmap.avatar) crossfade(true) transformations(CircleCropTransformation())//圆形图片 }), contentDescription = "composeCircleDemo" ) Spacer(modifier = Modifier.width(10.dp)) Text(text = "圆形图片示例") } }
10.效果预览:
11.Coli加载圆角图片:
@Preview @Composable fun clipImageDemo() {
Column(horizontalAlignment = Alignment.CenterHorizontally) {
Image( modifier = Modifier .fillMaxWidth() .padding(20.dp) .height(400.dp), painter = rememberImagePainter( data = ImageUrl.testUrl1, builder = {
placeholder(R.mipmap.avatar) crossfade(true) transformations(RoundedCornersTransformation(30f, 30f, 30f, 30f)) }), contentDescription = "composeClipDemo" ) Text(text = "加载圆角图片") } }
12.效果预览:
13.Coli加载gif图片:
@Preview @Composable fun coliLoadGifDemo() {
Column(horizontalAlignment = Alignment.CenterHorizontally) {
//自己构建图片加载器 val imageLoader = ImageLoader.Builder(LocalContext.current) .components(fun ComponentRegistry.Builder.() {
if (SDK_INT >= 28) {
add(ImageDecoderDecoder.Factory()) } else {
add(GifDecoder.Factory()) } }).build() Image( modifier = Modifier .fillMaxWidth() .height(400.dp) .padding(20.dp), painter = rememberImagePainter( data = ImageUrl.testGif, imageLoader = imageLoader, builder = {
placeholder(R.mipmap.avatar)//占位图 crossfade(true)//淡出效果 }), contentDescription = null ) Text(text = "加载gif图片") } }
14.效果预览:
15.Coli加载svg图片:
@Preview @Composable fun CoilSvgDemo() {
//coli加载svg图片,这里的图片格式是由svg转换后,虽然后缀不少.svg val context = LocalContext.current val imageLoader = ImageLoader.Builder(context) .components {
add(SvgDecoder.Factory()) } .crossfade(true) .build() Column(horizontalAlignment = Alignment.CenterHorizontally) {
Image( painter = rememberAsyncImagePainter( ImageUrl.svgUrl2, imageLoader = imageLoader, ), contentDescription = null, modifier = Modifier .fillMaxWidth() .height(400.dp) .padding(20.dp) ) Text(text = "coli加载svg格式图片") } }
16.效果预览:
17.Cloudy高斯模糊图片:
Cloudy 是一个专门处理Jectpack Compose中的Blur高斯模糊效果的支持库,它可以向后兼容低版本,由于官方的SDK中的Modifier.blur()
修饰符只能支持运行在Android 12+
的设备上才有效果,所以可以使用该库做兼容支持。
Cloudy 也不属于 Accompanist 库的一部分,是一个三方库,这里只是实现一下效果.
@Preview(showBackground = true) @Composable fun ModifierBlurSample() { Column( Modifier.padding(15.dp), horizontalAlignment = Alignment.CenterHorizontally ) { var progress by remember{ mutableStateOf(0f)} val radius by animateDpAsState(targetValue = (progress * 10f).dp) Text( text = "高斯模糊效果示例", Modifier.blur( radius = radius, edgeTreatment = BlurredEdgeTreatment.Unbounded ), fontSize = 20.sp ) Image( painter = painterResource(id = R.mipmap.avatar), contentDescription = null, modifier = Modifier .height(400.dp) .fillMaxWidth() .blur( radius = radius, edgeTreatment = BlurredEdgeTreatment.Unbounded ), ) Slider( value = progress, onValueChange = { progress = it }, ) } }
18.效果预览:
这里我是使用自己的Android13版本的手机测试的,发现有很明显的高斯模糊效果,但是在12以下的手机和模拟器上面都没有效果~~
19.设置模糊度效果:
@Preview @Composable fun BlurCloudyLibSample() {
Column( Modifier.padding(15.dp), horizontalAlignment = Alignment.CenterHorizontally ) {
var radius by remember{
mutableStateOf(0)} // radius支持范围是[0..25] Cloudy(radius = radius) {
Column {
AsyncImage( model = ImageUrl.testUrl2, contentDescription = null, onSuccess = {
radius = 1 }, modifier = Modifier .fillMaxWidth() .height(400.dp) ) Spacer(modifier = Modifier.width(20.dp)) Text(text = "高斯模糊渐变效果测试", fontSize = 30.sp) } } Spacer(modifier = Modifier.width(20.dp)) Row( modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceEvenly, verticalAlignment = Alignment.CenterVertically ) {
Button(onClick = {
if (radius > 0) radius-- }) {
Text(text = "模糊度减") } Text(text = "radius: $radius", fontSize = 30.sp) Button(onClick = {
if (radius < 25) radius++ }) {
Text(text = "模糊度加") } } } }
20.效果预览:
21.完整代码如下:
package com.example.composemodifiterdemo import android.content.ContentValues.TAG import android.os.Build.VERSION.SDK_INT import android.os.Bundle import android.util.Log import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.animation.core.animateDpAsState import androidx.compose.foundation.Image import androidx.compose.foundation.clickable import androidx.compose.foundation.interaction.MutableInteractionSource import androidx.compose.foundation.layout.* import androidx.compose.material.Button import androidx.compose.material.CircularProgressIndicator import androidx.compose.material.Slider import androidx.compose.material.Text import androidx.compose.runtime.* import androidx.compose.ui.Alignment import androidx.compose.ui.Modifier import androidx.compose.ui.draw.BlurredEdgeTreatment import androidx.compose.ui.draw.blur import androidx.compose.ui.layout.ContentScale import androidx.compose.ui.platform.LocalContext import androidx.compose.ui.res.painterResource import androidx.compose.ui.tooling.preview.Preview import androidx.compose.ui.unit.dp import androidx.compose.ui.unit.sp import coil.ComponentRegistry import coil.ImageLoader import coil.compose.* import coil.decode.GifDecoder import coil.decode.ImageDecoderDecoder import coil.decode.SvgDecoder import coil.request.ImageRequest import coil.transform.CircleCropTransformation import coil.transform.RoundedCornersTransformation import com.skydoves.cloudy.Cloudy import com.skydoves.landscapist.ImageOptions import com.skydoves.landscapist.coil.CoilImage / *@author: njb *@date: 2023/3/15 17:56 *@desc: */ class ColiSampleActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState) setContent {
//AsyncImageDemo() // SubComposeAsyncImageDemo() // AsyncImagePainterDemo() //circleImageDemo() //clipImageDemo() coliLoadGifDemo() //CoilSvgDemo() // CoilImageSVGDemo() //loadBlurSample() // BlurCloudyLibSample() } } } @Preview @Composable fun AsyncImageDemo() {
AsyncImage( model = ImageRequest.Builder(LocalContext.current) .data(ImageUrl.testUrl1) .crossfade(true) .build(), contentDescription = "compose", placeholder = painterResource(id = R.mipmap.place_holder), error = painterResource(id = R.mipmap.place_holder), onSuccess = {
Log.d(TAG, "success") }, modifier = Modifier .fillMaxWidth() .height(500.dp) ) } @Composable fun circleImageDemo() {
Column( horizontalAlignment = Alignment.CenterHorizontally ) {
Image( modifier = Modifier .fillMaxWidth() .height(500.dp), painter = rememberImagePainter( data = ImageUrl.testUrl1, builder = {
placeholder(R.mipmap.avatar) crossfade(true) transformations(CircleCropTransformation())//圆形图片 }), contentDescription = "composeCircleDemo" ) Spacer(modifier = Modifier.width(10.dp)) Text(text = "圆形图片示例") } } @Preview @Composable fun clipImageDemo() {
Column(horizontalAlignment = Alignment.CenterHorizontally) {
Image( modifier = Modifier .fillMaxWidth() .padding(20.dp) .height(400.dp), painter = rememberImagePainter( data = ImageUrl.testUrl1, builder = {
placeholder(R.mipmap.avatar) crossfade(true) transformations(RoundedCornersTransformation(30f, 30f, 30f, 30f)) }), contentDescription = "composeClipDemo" ) Text(text = "加载圆角图片") } } @Preview @Composable fun coliLoadGifDemo() {
Column(horizontalAlignment = Alignment.CenterHorizontally) {
//自己构建图片加载器 val imageLoader = ImageLoader.Builder(LocalContext.current) .components(fun ComponentRegistry.Builder.() {
if (SDK_INT >= 28) {
add(ImageDecoderDecoder.Factory()) } else {
add(GifDecoder.Factory()) } }).build() Image( modifier = Modifier .fillMaxWidth() .height(400.dp) .padding(20.dp), painter = rememberImagePainter( data = ImageUrl.testGif, imageLoader = imageLoader, builder = {
placeholder(R.mipmap.avatar)//占位图 crossfade(true)//淡出效果 }), contentDescription = null ) Text(text = "加载gif图片") } } @Preview @Composable fun SubComposeAsyncImageDemo() {
SubcomposeAsyncImage( model = ImageRequest .Builder(LocalContext.current) .data(ImageUrl.testUrl2) .build(), contentDescription = "composeAsyncDemo", modifier = Modifier .fillMaxWidth() .height(500.dp) ) {
if (painter.state is AsyncImagePainter.State.Loading || painter.state is AsyncImagePainter.State.Error) {
CircularProgressIndicator() } else {
SubcomposeAsyncImageContent() } } Text(text = "composeAsyncDemo") } @Preview @Composable fun AsyncImagePainterDemo() {
Column(horizontalAlignment = Alignment.CenterHorizontally) {
SubcomposeAsyncImage( model = ImageUrl.testUrl2, loading = {
CircularProgressIndicator() }, contentDescription = null, modifier = Modifier.size(200.dp, 600.dp) ) SubcomposeAsyncImage( model = ImageUrl.testUrl2, contentDescription = null, modifier = Modifier.size(200.dp) ) {
val state = painter.state when (state) {
is AsyncImagePainter.State.Loading -> CircularProgressIndicator() is AsyncImagePainter.State.Error -> Text("${
state.result.throwable}") is AsyncImagePainter.State.Success -> SubcomposeAsyncImageContent() is AsyncImagePainter.State.Empty -> Text("Empty") } } } } @Preview @Composable fun CoilSvgDemo() {
//coli加载svg图片 val context = LocalContext.current val imageLoader = ImageLoader.Builder(context) .components {
add(SvgDecoder.Factory()) } .crossfade(true) .build() Image( painter = rememberAsyncImagePainter( ImageUrl.svgUrl2, imageLoader = imageLoader, ), contentDescription = null, modifier = Modifier .fillMaxWidth() .height(400.dp) ) } @Composable fun CoilImageSVGDemo() {
// 加载网络svg val context = LocalContext.current val imageLoader = ImageLoader.Builder(context) .components {
add(SvgDecoder.Factory()) } .build() var flag by remember {
mutableStateOf(false) } val size by animateDpAsState(targetValue = if (flag) 600.dp else 300.dp) CoilImage( imageModel = {
ImageUrl.svgUrl2 }, imageOptions = ImageOptions( contentScale = ContentScale.Crop, alignment = Alignment.Center ), modifier = Modifier .size(size) .clickable( onClick = {
flag = !flag }, indication = null, interactionSource = MutableInteractionSource() ), imageLoader = {
imageLoader } ) } @Preview(showBackground = true) @Composable fun loadBlurSample() {
Column( Modifier.padding(15.dp), horizontalAlignment = Alignment.CenterHorizontally ) {
var progress by remember {
mutableStateOf(0f) } val radius by animateDpAsState(targetValue = (progress * 10f).dp) Text( text = "高斯模糊效果示例", Modifier.blur( radius = radius, edgeTreatment = BlurredEdgeTreatment.Unbounded ), fontSize = 20.sp ) Image( painter = painterResource(id = R.mipmap.test_iage), contentDescription = null, modifier = Modifier .height(400.dp) .fillMaxWidth() .blur( radius = radius, edgeTreatment = BlurredEdgeTreatment.Unbounded ), ) Slider( value = progress, onValueChange = {
progress = it }, ) } } @Preview @Composable fun BlurCloudyLibSample() {
Column( Modifier.padding(15.dp), horizontalAlignment = Alignment.CenterHorizontally ) {
var radius by remember {
mutableStateOf(0) } // 模糊度支持范围是[0..25] Cloudy(radius = radius) {
Column {
AsyncImage( model = ImageUrl.svgUrl2, contentDescription = null, onSuccess = {
radius = 1 }, modifier = Modifier .fillMaxWidth() .height(400.dp) ) } } Text(text = "高斯模糊渐变效果测试", fontSize = 20.sp) Row( modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceEvenly, verticalAlignment = Alignment.CenterVertically ) {
Button(onClick = {
if (radius > 0) radius-- }) {
Text(text = "模糊度减") } Text(text = "模糊度设置: $radius", fontSize = 20.sp) Button(onClick = {
if (radius < 25) radius++ }) {
Text(text = "模糊度加") } } } } class ImageUrl {
companion object {
val url: String by lazy {
"https://qcloudimg-moss.cp47.ott.cibntv.net/data_center/files/2022/10/26/67a66d35-3f7c-4de8-9dfe-c706e42f44f2.jpg" } var urlTest: String = "https://pic-go-bed.oss-cn-beijing.aliyuncs.com/img/929.png" var svgUrl: String = "https://developer.android.google.cn/static/images/jetpack/compose/animation-flowchart.svg" var svgUrl2 = "https://photo.16pic.com/00/76/45/16pic__b.png" var svgUrl3 = "https://photo.16pic.com/00/64/28/16pic__b.png" var svgUrl4 = "https://img0.baidu.com/it/u=,&fm=253&fmt=auto&app=138&f=JPEG?w=786&h=500" var svgUrl5 = "https://img1.baidu.com/it/u=,&fm=253&fmt=auto&app=138&f=JPEG?w=1200&h=500" var testUrl = "https://img0.baidu.com/it/u=,&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500" var testUrl1 = "https://image5.cnpp.cn/upload/images//_840x560.jpg" var testUrl2 = "https://img2.baidu.com/it/u=,&fm=253&fmt=auto&app=138&f=JPEG?w=704&h=500" var testGif = "https://img-blog.csdnimg.cn/b286b49591dc4bbda6e6cfb8e.gif#pic_center" } }
22.总结:
以上就是今天的学习内容,在compose中简单使用coli,希望对大家有帮助,一起学习,共同进步!!
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