android异常处理:未处理异常->线程退出->检查异常->处理

最新推荐文章于 2021-05-27 12:27:27 发布

原创最新推荐文章于 2021-05-27 12:27:27 发布 · 2.3k 阅读

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本文深入探讨了Android系统中线程未捕获异常处理机制，包括dvmDetachCurrentThread、dvmCheckException等核心方法的作用及流程。通过分析源码，详细解释了如何通过ActivityManager处理应用程序崩溃并生成错误报告。

dvmDetachCurrentThread

dvmCheckException

threadExitUncaughtException

Thread.uncaughtHandler.uncaughtException/ThreadGroup.uncaughtException

Thread.defaultUncaughtHandler

private static class UncaughtHandler implements Thread.UncaughtExceptionHandler {
        public void uncaughtException(Thread t, Throwable e) {
            try {
                // Don't re-enter -- avoid infinite loops if crash-reporting crashes.
                if (mCrashing) return;
                mCrashing = true;

                if (mApplicationObject == null) {
                    Slog.e(TAG, "*** FATAL EXCEPTION IN SYSTEM PROCESS: " + t.getName(), e);
                } else {
                    StringBuilder message = new StringBuilder();
                    message.append("FATAL EXCEPTION: ").append(t.getName()).append("\n");
                    final String processName = ActivityThread.currentProcessName();
                    if (processName != null) {
                        message.append("Process: ").append(processName).append(", ");
                    }
                    message.append("PID: ").append(Process.myPid());
                    Slog.e(TAG, message.toString(), e);
                }

                // Bring up crash dialog, wait for it to be dismissed
                ActivityManagerNative.getDefault().handleApplicationCrash(
                        mApplicationObject, new ApplicationErrorReport.CrashInfo(e));
            } catch (Throwable t2) {
                try {
                    Slog.e(TAG, "Error reporting crash", t2);
                } catch (Throwable t3) {
                    // Even Slog.e() fails!  Oh well.
                }
            } finally {
                // Try everything to make sure this process goes away.
                Process.killProcess(Process.myPid());
                System.exit(10);
            }
        }
    }