Android Coil 3加载error失败后fallback加载，Kotlin

zhangphil2026-02-10 11:41

Android Coil 3加载error失败后fallback加载，Kotlin

复制代码

    implementation("io.coil-kt.coil3:coil:3.3.0")
    implementation("io.coil-kt.coil3:coil-core:3.3.0")

Kotlin 复制代码

import android.os.Bundle
import android.util.Log
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import coil3.Image
import coil3.imageLoader
import coil3.request.ErrorResult
import coil3.request.ImageRequest
import coil3.request.SuccessResult
import coil3.toBitmap


class MainActivity : AppCompatActivity() {
    private val TAG = "fly"

    private var imageView: ImageView? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        imageView = findViewById<ImageView>(R.id.image)

        val req = ImageRequest.Builder(this)
            .data("特意设置的无效路径")
            .error(errorFallbackRequest())
            .listener(object : ImageRequest.Listener {
                override fun onSuccess(request: ImageRequest, result: SuccessResult) {
                    //不可能成功，因为data的路径是无效的
                    Log.d(TAG, "onSuccess ${request.data}")
                }

                override fun onError(request: ImageRequest, result: ErrorResult) {
                    Log.d(TAG, "onError ${request.data}")
                }
            }).build()

        applicationContext.imageLoader.enqueue(req)
    }

    private fun errorFallbackRequest(): Image? {
        val fallbackReq = ImageRequest.Builder(this)
            .data(android.R.drawable.ic_menu_gallery)
            .listener(object : ImageRequest.Listener {
                override fun onSuccess(request: ImageRequest, result: SuccessResult) {
                    Log.d(TAG, "fallbackReq onSuccess ${request.data}")
                    imageView?.setImageBitmap(result.image.toBitmap())
                }
            }).build()

        imageLoader.enqueue(fallbackReq)

        return null
    }
}

日志输出：

D onError 特意设置的无效路径

D fallbackReq onSuccess 17301567