Question

我正在尝试在logcat上显示长消息。如果消息的长度超过1000个字符，则会被破坏。

在logcat中显示长消息的所有字符的机制是什么？

Answer 1

如果logcat将长度限制为1000，那么您可以使用String.subString（）拆分要记录的字符串并将其记录为碎片。例如：

int maxLogSize = 1000;
for(int i = 0; i <= veryLongString.length() / maxLogSize; i++) {
    int start = i * maxLogSize;
    int end = (i+1) * maxLogSize;
    end = end > veryLongString.length() ? veryLongString.length() : end;
    Log.v(TAG, veryLongString.substring(start, end));
}

Answer 2

作为spatulamania的回答，我写了一个包装类来为你处理这个问题。您只需要更改导入，它就会记录所有内容

public class Log {

    public static void d(String TAG, String message) {
        int maxLogSize = 2000;
        for(int i = 0; i <= message.length() / maxLogSize; i++) {
            int start = i * maxLogSize;
            int end = (i+1) * maxLogSize;
            end = end > message.length() ? message.length() : end;
            android.util.Log.d(TAG, message.substring(start, end));
        }
    }

}

Answer 3

这建立在spatulamania的答案之上，有点简洁，并且最后不会添加空的日志消息：

final int chunkSize = 2048;
for (int i = 0; i < s.length(); i += chunkSize) {
    Log.d(TAG, s.substring(i, Math.min(s.length(), i + chunkSize)));
}

Answer 4

尝试使用这段代码在logcat中显示长消息。

public void logLargeString(String str) {
    if(str.length() > 3000) {
        Log.i(TAG, str.substring(0, 3000));
        logLargeString(str.substring(3000));
    } else {
        Log.i(TAG, str); // continuation
    }
}

Answer 5

使用HttpLoggingInterceptor的OkHttp就是这样做的：

public void log(String message) {
  // Split by line, then ensure each line can fit into Log's maximum length.
  for (int i = 0, length = message.length(); i < length; i++) {
    int newline = message.indexOf('\n', i);
    newline = newline != -1 ? newline : length;
    do {
      int end = Math.min(newline, i + MAX_LOG_LENGTH);
      Log.d("OkHttp", message.substring(i, end));
      i = end;
    } while (i < newline);
  }
}

MAX_LOG_LENGTH是4000。

这里使用Log.d（debug）和硬编码＆＃34; OkHttp＆＃34;标签

它将日志分成换行符或达到最大长度。

下面这个类是一个帮助类，你可以使用（如果你有lambda支持抛出Jack＆amp; Jill或者retrolambda）来做OkHttp在任何日志上做的事情：

/**
 * Help printing logs splitting text on new line and creating multiple logs for too long texts
 */

public class LogHelper {

    private static final int MAX_LOG_LENGTH = 4000;

    public static void v(@NonNull String tag, @Nullable String message) {
        log(message, line -> Log.v(tag, line));
    }

    public static void d(@NonNull String tag, @Nullable String message) {
        log(message, line -> Log.d(tag, line));
    }

    public static void i(@NonNull String tag, @Nullable String message) {
        log(message, line -> Log.i(tag, line));
    }

    public static void w(@NonNull String tag, @Nullable String message) {
        log(message, line -> Log.w(tag, line));
    }

    public static void e(@NonNull String tag, @Nullable String message) {
        log(message, line -> Log.e(tag, line));
    }

    public static void v(@NonNull String tag, @Nullable String message, @Nullable Throwable throwable) {
        log(message, throwable, line -> Log.v(tag, line));
    }

    public static void d(@NonNull String tag, @Nullable String message, @Nullable Throwable throwable) {
        log(message, throwable, line -> Log.d(tag, line));
    }

    public static void i(@NonNull String tag, @Nullable String message, @Nullable Throwable throwable) {
        log(message, throwable, line -> Log.i(tag, line));
    }

    public static void w(@NonNull String tag, @Nullable String message, @Nullable Throwable throwable) {
        log(message, throwable, line -> Log.w(tag, line));
    }

    public static void e(@NonNull String tag, @Nullable String message, @Nullable Throwable throwable) {
        log(message, throwable, line -> Log.e(tag, line));
    }

    private static void log(@Nullable String message, @NonNull LogCB callback) {
        if (message == null) {
            callback.log("null");
            return;
        }
        // Split by line, then ensure each line can fit into Log's maximum length.
        for (int i = 0, length = message.length(); i < length; i++) {
            int newline = message.indexOf('\n', i);
            newline = newline != -1 ? newline : length;
            do {
                int end = Math.min(newline, i + MAX_LOG_LENGTH);
                callback.log(message.substring(i, end));
                i = end;
            } while (i < newline);
        }
    }

    private static void log(@Nullable String message, @Nullable Throwable throwable, @NonNull LogCB callback) {
        if (throwable == null) {
            log(message, callback);
            return;
        }
        if (message != null) {
            log(message + "\n" + Log.getStackTraceString(throwable), callback);
        } else {
            log(Log.getStackTraceString(throwable), callback);
        }
    }

    private interface LogCB {
        void log(@NonNull String message);
    }
}

Answer 6

为了不尽量减少日志消息中的分割线，我采用大字符串并分别记录每一行。

class Test{

    private int someValue = 10;

    [RunWhen(10)]
    public void MethodA(){
        Console.WriteLine("Method A");
    }

    [RunWhen(100)]
    public void MethodB(){
        Console.WriteLine("Method B");
    }

    [RunWhen(1000)]
    public void MethodC(){
        Console.WriteLine("Method C");
    }
}

Answer 7

以下是@spatulamania answer的Kotlin版本（特别是懒惰/聪明人）：

val maxLogSize = 1000
val stringLength = yourString.length
for (i in 0..stringLength / maxLogSize) {
    val start = i * maxLogSize
    var end = (i + 1) * maxLogSize
    end = if (end > yourString.length) yourString.length else end
    Log.v("YOURTAG", yourString.substring(start, end))
}

Answer 8

我认为Timber是解决这个问题的好方法。 Timber会在logcat中自动拆分并打印消息块。

https://github.com/JakeWharton/timber

您可以在timber.log.Timber.DebugTree静态类中看到日志方法实现。

Answer 9

如果打印json字符串，可以使用下面的代码

    @JvmStatic
    fun j(level: Int, tag: String? = null, msg: String) {
        if (debug) {
            if (TextUtils.isEmpty(msg)) {
                p(level, tag, msg)
            } else {
                val message: String
                message = try {
                    when {
                        msg.startsWith("{") -> {
                            val jsonObject = JSONObject(msg)
                            jsonObject.toString(4)
                        }
                        msg.startsWith("[") -> {
                            val jsonArray = JSONArray(msg)
                            jsonArray.toString(4)
                        }
                        else -> msg
                    }
                } catch (e: JSONException) {
                    e.printStackTrace()
                    msg
                }
                p(level, tag, "╔═══════════════════════════════════════════════════════════════════════════════════════", false)
                val lines = message.split(LINE_SEPARATOR.toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
                for (line in lines) {
                    p(level, tag, "║ $line", false)
                }
                p(level, tag, "╚═══════════════════════════════════════════════════════════════════════════════════════", false)
            }
        }
    }

full code

CXLogUtil.j（“ json-tag”，“ {}”）

Answer 10

通过 Kotlin，我们可以使用 stdlib chunked 函数：

fun logUnlimited(tag: String, string: String) {
    val maxLogSize = 1000
    string.chunked(maxLogSize).forEach { Log.v(tag, it) }
}

Answer 11

要获得一个简单的解决方案，请在附加点下方使用使用软包装选项，没有4个选项可能会对您有所帮助。

如何在logcat中显示长消息

11 个答案: