Android大图监测系统的三种实现方式

class LargeImageScanner {

    fun scanLargeImages() {
        // 遍历内存中的图片资源
        for (image in MemoryManager.getAllImages()) {
            val imageSize = calculateImageSize(image)
            
            // 判断是否为大图
            if (imageSize > LARGE_IMAGE_THRESHOLD) {
                // 进行处理，如压缩、裁剪或异步加载
                handleLargeImage(image)
            }
        }
    }

    private fun calculateImageSize(image: Bitmap): Int {
        // 计算图片占用的内存大小
        return image.width * image.height * (image.config.bitsPerPixel / 8)
    }

    private fun handleLargeImage(image: Bitmap) {
        // 实现大图的处理逻辑，例如压缩、裁剪或异步加载
        // ...
    }
}

class GlideImageLoader {

    fun loadWithLargeImageCheck(context: Context, url: String, target: ImageView) {
        Glide.with(context)
            .asBitmap()
            .load(url)
            .listener(object : RequestListener<Bitmap> {
                override fun onLoadFailed(
                    e: GlideException?,
                    model: Any?,
                    target: Target<Bitmap>?,
                    isFirstResource: Boolean
                ): Boolean {
                    // 图片加载失败处理
                    // ...
                    return false
                }

                override fun onResourceReady(
                    resource: Bitmap?,
                    model: Any?,
                    target: Target<Bitmap>?,
                    dataSource: DataSource?,
                    isFirstResource: Boolean
                ): Boolean {
                    // 图片加载成功，检查是否为大图
                    resource?.let {
                        val imageSize = calculateImageSize(it)
                        if (imageSize > LARGE_IMAGE_THRESHOLD) {
                            // 处理大图逻辑，如压缩、裁剪或异步加载
                            handleLargeImage(it)
                        }
                    }
                    return false
                }
            })
            .into(target)
    }

    private fun calculateImageSize(image: Bitmap): Int {
        // 计算图片占用的内存大小
        return image.width * image.height * (image.config.bitsPerPixel / 8)
    }

    private fun handleLargeImage(image: Bitmap) {
        // 实现大图的处理逻辑，例如压缩、裁剪或异步加载
        // ...
    }
}

import okhttp3.Interceptor
import okhttp3.OkHttpClient
import okhttp3.Response
import java.io.IOException

class LargeImageInterceptor : Interceptor {

    @Throws(IOException::class)
    override fun intercept(chain: Interceptor.Chain): Response {
        val request = chain.request()

        // 发起请求前的处理，可以在这里记录请求时间等信息

        val response = chain.proceed(request)

        // 请求返回后的处理
        if (response.isSuccessful) {
            val contentType = response.body()?.contentType()?.toString()

            // 检查是否为图片资源
            if (contentType?.startsWith("image/") == true) {
                // 获取图片大小并进行大图监测
                val imageSize = calculateImageSize(response.body()?.byteStream())
                if (imageSize > LARGE_IMAGE_THRESHOLD) {
                    // 处理大图逻辑，如压缩、裁剪或异步加载
                    handleLargeImage()
                }
            }
        }

        return response
    }

    private fun calculateImageSize(inputStream: InputStream?): Int {
        // 通过输入流计算图片占用的内存大小
        // ...
    }

    private fun handleLargeImage() {
        // 实现大图的处理逻辑，例如压缩、裁剪或异步加载
        // ...
    }
}

val okHttpClient = OkHttpClient.Builder()
    .addInterceptor(LargeImageInterceptor())
    .build()

import org.objectweb.asm.*;

public class ImageViewInterceptor implements ClassVisitor {

    private final ClassVisitor cv;

    public ImageViewInterceptor(ClassVisitor cv) {
        this.cv = cv;
    }

    @Override
    public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
        MethodVisitor mv = cv.visitMethod(access, name, desc, signature, exceptions);
        if (name.equals("setImageDrawable") && desc.equals("(Landroid/graphics/drawable/Drawable;)V")) {
            return new ImageViewMethodVisitor(mv);
        }
        return mv;
    }

    // 其他方法省略，你可以根据需要实现其他 visitX 方法
}

class ImageViewMethodVisitor extends MethodVisitor {

    public ImageViewMethodVisitor(MethodVisitor mv) {
        super(Opcodes.ASM5, mv);
    }

    @Override
    public void visitCode() {
        super.visitCode();
        // 在方法开头插入大图监测逻辑的字节码
        // ...
    }

    @Override
    public void visitInsn(int opcode) {
        if (opcode == Opcodes.RETURN) {
            // 在 RETURN 指令前插入大图监测逻辑的字节码
            // ...
        }
        super.visitInsn(opcode);
    }
}

// 在某处，使用 ASM 进行字节码修改
ClassReader cr = new ClassReader("android/widget/ImageView");
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
ImageViewInterceptor interceptor = new ImageViewInterceptor(cw);
cr.accept(interceptor, 0);

....