如何去掉android.Log.d？

Question

一般假设

所以我发现很多关于使用proguard从代码中剥离日志语句.基本上所有的说法 - 使用$ {sdk.dir} /tools/proguard/proguard-android-optimize.txt配置的效果都会起作用.我的理解是让字节码等于做一些

if(Consts.DEBUG) Log.d("","");

又名我假设从我的apk中删除了对doSomeExpensiveStuff()的调用:

android.util.Log.d("Hello","World"+(new Foo().doSomeExpensiveStuff()));

我的守则

public class MainActivity extends Activity {
    private class Slooow {
        @Override
        public String toString() {
            // being slow
            try {
               Thread.sleep(5000);
            } catch(InterruptedException e) {
            }
            return "bla";
        }
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d("tag", "onCreate: " + (new Slooow().toString()));
    }
}

ProGuard的-project.txt:

-repackageclasses ''
-optimizationpasses 5
-dontobfuscate
-assumenosideeffects class android.util.Log { public * ; }

反编译的dex文件

.method public onCreate(Landroid/os/Bundle;)V
.limit registers 5
; this: v3 (Lcom/example/test/MainActivity;)
; parameter[0] : v4 (Landroid/os/Bundle;)
.line 18
    invoke-super    {v3,v4},android/app/Activity/onCreate   ; onCreate(Landroid/os/Bundle;)V
.line 19
    const/high16    v0,32515
    invoke-virtual  {v3,v0},com/example/test/MainActivity/setContentView    ; setContentView(I)V
.line 20
    new-instance    v0,java/lang/StringBuilder
    const-string    v1,"onCreate: "
    invoke-direct   {v0,v1},java/lang/StringBuilder/<init>  ; <init>(Ljava/lang/String;)V
    new-instance    v1,com/example/test/MainActivity$Slooow
    const/4 v2,0
    invoke-direct   {v1,v2},com/example/test/MainActivity$Slooow/<init> ; <init>(B)V
    invoke-virtual  {v1},com/example/test/MainActivity$Slooow/toString  ; toString()Ljava/lang/String;
    move-result-object  v1
    invoke-virtual  {v0,v1},java/lang/StringBuilder/append  ; append(Ljava/lang/String;)Ljava/lang/StringBuilder;
.line 21
    return-void 
.end method

问题

现在,如果我将其部署到我的设备,我没有得到任何日志输出,但仍然是5s睡眠(或任何其他延迟或代码不应该打扰我的用户崩溃).我究竟做错了什么？

进一步调查

Log.d("t", "h" + "w");                           // would get stripped just fine.
if(DEBUG)
  Log.d("t", "h: " + (new Slooow().toString())); // would get optimized away, too.
Log.d("t", "h" + bundle.toString());             // has just the same problem as described above.

Answer 1

虽然我不知道答案，但我相信拥有final static boolean DEBUG = false将导致if(D) { Log.d(...) }被编译器完全剥离