android - Android 的 Log.wtf 在什么情况下会终止我的应用程序？

Question

我想将我的应用程序的错误报告记录到 Android 电子市场错误控制台；看起来我可以使用 Log.wtf为此。

Log.wtf 的文档说:

What a Terrible Failure: Report a condition that should never happen. The error will always be logged at level ASSERT with the call stack. Depending on system configuration, a report may be added to the DropBoxManager and/or the process may be terminated immediately with an error dialog.

在我的例子中，我可以捕获这些异常并通过显示错误消息从中恢复；我不希望我的应用程序崩溃，但我确实希望将报告发送到错误控制台。

在什么情况下 Log.wtf 会终止我的应用程序？是否有可能在不导致应用程序崩溃的情况下获取错误报告？

Answer 1

这取决于您的系统设置(某些选项可以启用调试但在普通设备上禁用)。它们是在为设备和可能的内核编译 android 时启用的设置。

我建议使用带前缀的 Log.e() 而不是 Log.wtf() 以避免任何问题，例如WTF:发生了可怕的事情

这是调用 Log.wtf() 时发生的情况

-> 日志.java

/**
 * What a Terrible Failure: Report an exception that should never happen.
 * Similar to {@link #wtf(String, Throwable)}, with a message as well.
 * @param tag Used to identify the source of a log message.
 * @param msg The message you would like logged.
 * @param tr An exception to log.  May be null.
 */
public static int wtf(String tag, String msg, Throwable tr) {
    TerribleFailure what = new TerribleFailure(msg, tr);
    int bytes = println_native(LOG_ID_MAIN, ASSERT, tag, getStackTraceString(tr));
    sWtfHandler.onTerribleFailure(tag, what);
    return bytes;
}

-> 日志.java

private static TerribleFailureHandler sWtfHandler = new TerribleFailureHandler() {
        public void onTerribleFailure(String tag, TerribleFailure what) {
            RuntimeInit.wtf(tag, what);
        }
    };

->RuntimeInit.java

/**
 * Report a serious error in the current process.  May or may not cause
 * the process to terminate (depends on system settings).
 *
 * @param tag to record with the error
 * @param t exception describing the error site and conditions
 */
public static void wtf(String tag, Throwable t) {
    try {
        if (ActivityManagerNative.getDefault()
                .handleApplicationWtf(mApplicationObject, tag,
                        new ApplicationErrorReport.CrashInfo(t))) {
            // The Activity Manager has already written us off -- now exit.
            Process.killProcess(Process.myPid());
            System.exit(10);
        }
    } catch (Throwable t2) {
        Slog.e(TAG, "Error reporting WTF", t2);
    }
}

->ActivityManagerNative.java

public boolean handleApplicationWtf(IBinder app, String tag,
        ApplicationErrorReport.CrashInfo crashInfo)
        throws RemoteException {
    Parcel data = Parcel.obtain();
    Parcel reply = Parcel.obtain();
    data.writeInterfaceToken(IActivityManager.descriptor);
    data.writeStrongBinder(app);
    data.writeString(tag);
    crashInfo.writeToParcel(data, 0);
    mRemote.transact(HANDLE_APPLICATION_WTF_TRANSACTION, data,
            reply, 0);
    reply.readException();
    boolean res = reply.readInt() != 0;
    reply.recycle();
    data.recycle();
    return res;
}