【性能工具】一种简易hook bitmap创建的插件使用

一、插件开源地址：

https://github.com/DarkAdventurerr/lancet

二、插件引入：

• 1、rootProject/build.gradle

classpath 'com.github.HairySnow.lancet:lancet-plugin:1.0.3'

• 2、app/build.gradle

apply plugin: 'com.hairysnow.lancet'
// 添加库依赖
compileOnly 'com.github.HairySnow.lancet:lancet-base:1.0.3'

三、编写插桩代码

因为加载Bitmap基本都要经过Bitmap.create()方法创建Bitmap对象，所以只需hook Bitmap.createBitmap方法的所有重载方法即可监控到图片的创建过程，在hook方法执行到时，通过width * height * 图片位深度的方式就可以计算出bitmap的内存占用大小。

@TargetClass(value = “android.graphics.Bitmap”) 注解指定要插桩的类全路径，可以通过AS查找到这个类后鼠标放在类名上右键选择copy Reference就可以拿到该注解需要传入的参数值
@Proxy(value = “createBitmap”) 注解指定要插桩的类的具体方法名
一般来说使用Glide加载图片用到的是createBitmap(int width, int height, Bitmap.Config config)这个重载方法的实现。

public class BitmapHook {@TargetClass(value = "android.graphics.Bitmap")@Proxy(value = "createBitmap")public static Bitmap createBitmap(Bitmap source) {float factor = 1;if (source.getConfig().name().equals(Bitmap.Config.ARGB_8888.name())) {factor = 4;} else if (source.getConfig().name().equals(Bitmap.Config.ARGB_4444.name()) || source.getConfig().name().equals(Bitmap.Config.RGB_565.name())) {factor = 2;} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && source.getConfig().name().equals(Bitmap.Config.RGBA_F16.name())) {factor = 8;}int width = source.getWidth();int height = source.getHeight();float size = width * height * factor / (1024f * 1024f);Log.i("BitmapHook", "createBitmap: size = " + size + ", w = " + width + ", h = " + height);return (Bitmap) Origin.call();}@TargetClass(value = "android.graphics.Bitmap")@Proxy(value = "createBitmap")public static Bitmap createBitmap(Bitmap source, int x, int y, int width, int height) {float factor = 1;if (source.getConfig().name().equals(Bitmap.Config.ARGB_8888.name())) {factor = 4;} else if (source.getConfig().name().equals(Bitmap.Config.ARGB_4444.name()) || source.getConfig().name().equals(Bitmap.Config.RGB_565.name())) {factor = 2;} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && source.getConfig().name().equals(Bitmap.Config.RGBA_F16.name())) {factor = 8;}float size = width * height * factor / (1024f * 1024f);Log.i("BitmapHook", "createBitmap: size = " + size + ", w = " + width + ", h = " + height);return (Bitmap) Origin.call();}@TargetClass(value = "android.graphics.Bitmap")@Proxy(value = "createBitmap")public static Bitmap createBitmap(int width, int height, Bitmap.Config config) {float factor = 1;if (config.name().equals(Bitmap.Config.ARGB_8888.name())) {factor = 4;} else if (config.name().equals(Bitmap.Config.ARGB_4444.name()) || config.name().equals(Bitmap.Config.RGB_565.name())) {factor = 2;} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && config.name().equals(Bitmap.Config.RGBA_F16.name())) {factor = 8;}float size = width * height * factor / (1024f * 1024f);Log.i("BitmapHook", "createBitmap: size = " + size + "MB, w = " + width + ", h = " + height);return (Bitmap) Origin.call();}
}

ps: 上面并没有hook createBitmap所有重载方法，只是贴上了常见的，有新增需按照如上模板代码添加实现。

四、编写调用demo代码，验证插桩效果

BitmapHookActivity代码：

class BitmapHookActivity : AppCompatActivity() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_bitmap_hook)val imageView = findViewById<ImageView>(R.id.imageview)Glide.with(this@BitmapHookActivity).load(R.drawable.test).override(1920, 1080).into(imageView)}
}

输出：

2025-05-07 19:30:18.776 28613-28700 BitmapHook        com.demo.leanbackdemo       I  createBitmap: size = 3.1723022MB, w = 770, h = 1080

如上输出就拿到了使用Glide加载的Bitmap对象的内存占用大小，然后增加判断超过内存占用阈值的bitmap，可以增加一些后台上报信息。