请问 Android.util.log 这个类在 android 源码中哪个包呢

请问 Android.util.log 这个类在 android 源码中哪个包呢？找了半天没找到

就在android.util这个包下面。在frameworks/base/core下面，可以搜索一下find ./frameworks/base -name Log.java

当然他是用ddms的logcat来查看，上面分别有显示v，d，i，w，e d：表示debug,就是代码中的log.d("tips","degug"); v：表示view,就是代码中的log.v("tips","verbose"); i：表示debug,就是代码中的log.i("tips","info"); e：表示debug,就是代码中的log.e("tips","error"); …………………… 不同的方法在logcat里面显示的颜色不同，你可以根据你的需要来决定用哪个方法，然后通过上面的v，d，i，w，e来过滤掉你不需要的东西 verbose should never be compiled into an application except during development. debug logs are compiled in but stripped at runtime. error, warning and info logs are always kept. tip: don't forget that when you make a call like log.v(tag, "index=" + i); that when you're building the string to pass into log.d, java uses a stringbuilder and at least three allocations occur: the stringbuilder itself, the buffer, and the string object. realistically, there is also another buffer allocation and copy, and even more pressure on the gc. that means that if your log message is filtered out, you might be doing significant work and incurring significant overhead.