Android GlideApp decode file resource shared by different processes，Kotlin

Android GlideApp decode file resource shared by different processes，Kotlin

import android.content.Context
import android.os.Environment
import android.util.Log
import com.bumptech.glide.GlideBuilder
import com.bumptech.glide.annotation.GlideModule
import com.bumptech.glide.load.engine.cache.DiskLruCacheFactory
import com.bumptech.glide.module.AppGlideModule
import java.io.File


@GlideModule
class MyGlideModule : AppGlideModule() {

    override fun applyOptions(ctx: Context, builder: GlideBuilder) {
        super.applyOptions(ctx, builder)

        builder.setLogLevel(Log.DEBUG)

        val diskCacheFolder = Environment.getExternalStorageDirectory()
        val diskCacheName = "fly_disk_cache" //实际场景在前面加一个 . 变成这样 .fly_disk_cache ，对用户隐藏缓存目录。
        val diskCacheSize: Long = 1024 * 1024 * 2048L

        val cacheFolder = File(diskCacheFolder, diskCacheName)
        if (cacheFolder.exists()) {
            Log.d("fly", "${cacheFolder.absolutePath} exists")
        } else {
            if (cacheFolder.mkdir()) {
                Log.d("fly", "${cacheFolder.absolutePath} create OK")
            }
        }

        val diskLruCacheFactory = DiskLruCacheFactory(diskCacheFolder.absolutePath, diskCacheName, diskCacheSize)
        builder.setDiskCache(diskLruCacheFactory)
    }

    override fun isManifestParsingEnabled(): Boolean {
        return false
    }
}

import android.content.Context
import android.os.Bundle
import android.provider.MediaStore
import android.text.TextUtils
import androidx.appcompat.app.AppCompatActivity
import androidx.lifecycle.lifecycleScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import java.text.SimpleDateFormat


class MainActivity : AppCompatActivity() {
    companion object {
        const val SIZE = 400
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val ctx = applicationContext
        lifecycleScope.launch(Dispatchers.IO) {
            val lists = readAllImage(this@MainActivity)
            lists.forEach {
                GlideApp.with(ctx)
                    .load(it.path)
                    .fitCenter()
                    .override(SIZE)
                    .submit(SIZE, SIZE)
                    .get()
            }
        }
    }

    private fun readAllImage(context: Context): ArrayList<MyData> {
        val photos = ArrayList<MyData>()

        //读取所有图
        val cursor = context.contentResolver.query(
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null
        )

        var index = 0
        val sdf = SimpleDateFormat("yyyy-MM-dd")
        while (cursor!!.moveToNext()) {
            //路径 uri
            val path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA))
            if (TextUtils.isEmpty(path)) {
                continue
            }

            val dateModified = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATE_MODIFIED))

            //图片名称
            //val name = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME))
            //图片大小
            //val size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.SIZE))

            val dateStr = sdf.format(dateModified?.toLong()!! * 1000)

            val data = MyData()
            data.path = path
            data.dateModified = dateModified.toLong()
            data.dateString = dateStr
            data.index = index++

            photos.add(data)
        }
        cursor.close()

        return photos
    }

    class MyData {
        var dateModified: Long? = 0L
        var dateString: String? = null
        var path: String? = null
        var index: Int? = null
    }
}

依赖问题：目标是把设备上的全部图资源先解码放好，备着后续使用，但由于Glide的加载器启动一个decode任务依赖activity的生命周期，当把activity切入后台后，之前启动的任务加载完后，就暂停了。理想的情况是让Glide在后台一直静默decode原始图文件，不依赖/不去感知activity的生命周期变化。因为有的场景只是在后台起了一个service，没有前台界面，静默decode图。

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