参考资料

安卓动态调试七种武器之长生剑 - Smali Instrumentation

Smali注入之打造属于自己的安卓crack利器

利用代码

.class public Lcrack;
.super Ljava/lang/Object;
.source "crack.java"

.method public static log(Ljava/lang/String;)V
    .locals 1
    .prologue

    const-string v0, "info"
    invoke-static {v0, p0}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
    return-void
.end method