#算数运算 Java代码：

public void num(int b){int a = b;boolean b1 = true;Log.d("MainActivity","a + b ="+(a+b));Log.d("MainActivity","a - b ="+(a-b));Log.d("MainActivity","a * b ="+(a*b));Log.d("MainActivity","a / b ="+(a/b));Log.d("MainActivity","a % b ="+(a%b));
}

与之对应的smali代码：

.method public num(I)V.locals 5                  #定义局部变量寄存器.param p1,"b"         #声明参数.prologue                #代码开始.line 30move v0, p1            #数据变量赋值    .line 31.local v0, "a":I        #定义局部变量const/4 v1, 0x1     #数据常量赋值.line 32.local v1, "b1":Z    #定义局部变量const-string v2, "MainActivity"    #定义字符串常量new-instance v3,Ljava/lang/StringBuilder;    #创建StringBuilder对象invoke-direct {v3},Ljava/lang/StringBuilder;-><init>()V #调用构造const-string v4,"a+b="    #调用虚方法  v3.append(v4)invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;move-result-object v3    #将返回值放入v3add-int v4,v0,p1        #v4=v0+v1invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;    # v3.append(v4)move-result-object v3invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;move-result-object v3invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String)    #调用静态方法.line 33const-string v2,"MainActivity"new-instance v3,Ljava/lang/StringBuilder;-><init>Vconst-string v4,"a-b="invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;move-result-object v3sub-int v4,v0,p1        #v4 = v0 - p1invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;move-result-object v3invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;move-result-object v3invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String) .line 34const-string v2,"MainActivity"new-instance v3,Ljava/lang/StringBuilder;-><init>Vconst-string v4,"a/b="invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;move-result-object v3div-int v4,v0,p1        #v4 = v0 / p1invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;move-result-object v3invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;move-result-object v3invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String) .line35const-string v2,"MainActivity"new-instance v3,Ljava/lang/StringBuilder;-><init>Vconst-string v4,"a*b="invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;move-result-object v3mul-int v4,v0,p1    #v4 = v0 * p1invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;move-result-object v3invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;move-result-object v3invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String) .line 36const-string v2,"MainActivity"new-instance v3,Ljava/lang/StringBuilder;-><init>Vconst-string v4,"a/b="invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;move-result-object v3rem-int v4,v0,p1        #v4 = v0 % p1invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;move-result-object v3invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;move-result-object v3invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String) .line 37return-void
.end method

可以看到关于算数运算的代码如下：

    add-int v4, v0 ,p1        加法，v4 = v0 + p1sub-int v4, v0 ,p1        减法，v4 = v0 - p1mul-int v4, v0 ,p1        乘法，v4 = v0 * p1div-int v4, v0 ,p1        除法，v4 = v0 / p1rem-int v4, v0 ,p1        取余，v4 = v0 % p1