打印日志-白红宇

打印日志

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发布时间：2019-05-27

本文共 2788 字，大约阅读时间需要 9 分钟。

ContextImpl: Calling a method in the system process without a qualified user: android.app.ContextImpl.startActivity:1005 android.app.ContextImpl.startActivity:994 android.content.ContextWrapper.startActivity:403 应用的包名和类名:116

Android中的ContextImpl竟然打印了Service和BroadcastReceiver的调用栈

看源码：

根据“Calling a method in the system process without”查找代码。

1.ContextImpl.java

frameworks/base/core/java/android/app/ContextImpl.java

在startActivity的时候调用了warnIfCallingFromSystemProcess方法，，warnIfCallingFromSystemProcess会通过Debug.getCallers(5)来打印当前应用的任务栈

991      @Override992      public void startActivity(Intent intent) {993          warnIfCallingFromSystemProcess();994          startActivity(intent, null);995      }

2239      private void warnIfCallingFromSystemProcess() {2240          if (Process.myUid() == Process.SYSTEM_UID) {2241              Slog.w(TAG, "Calling a method in the system process without a qualified user: "2242                      + Debug.getCallers(5));2243          }2244      }

2.Deubug

frameworks/base/core/java/android/os/Debug.java

2470      /**2471       * Return a String describing the calling method and location at a particular stack depth.2472       * @param callStack the Thread stack2473       * @param depth the depth of stack to return information for.2474       * @return the String describing the caller at that depth.2475       */2476      private static String getCaller(StackTraceElement callStack[], int depth) {2477          // callStack[4] is the caller of the method that called getCallers()2478          if (4 + depth >= callStack.length) {2479              return "
   
    ";2480          }2481          StackTraceElement caller = callStack[4 + depth];2482          return caller.getClassName() + "." + caller.getMethodName() + ":" + caller.getLineNumber();2483      }2484  2485      /**2486       * Return a string consisting of methods and locations at multiple call stack levels.2487       * @param depth the number of levels to return, starting with the immediate caller.2488       * @return a string describing the call stack.2489       * {@hide}2490       */2491      @UnsupportedAppUsage2492      public static String getCallers(final int depth) {2493          final StackTraceElement[] callStack = Thread.currentThread().getStackTrace();2494          StringBuffer sb = new StringBuffer();2495          for (int i = 0; i < depth; i++) {2496              sb.append(getCaller(callStack, i)).append(" ");2497          }2498          return sb.toString();2499      }

主要代码就是：Thread获取当前线程的堆栈元素

final StackTraceElement[] callStack = Thread.currentThread().getStackTrace();

StackTraceElement caller = callStack[4 + depth];2482          return caller.getClassName() + "." + caller.getMethodName() + ":" + caller.getLineNumber();

StackTraceElement 打印主要信息

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