今天寫程式碼的時候，伺服器返回的json資料量比較大，然後我想在logcat中完全輸出伺服器返回的Json格式的字串事，發現logcat中返回的資訊中明顯少了後面一節，剛開始還以為程式有bug，除錯了好半天才發現原來程式沒有bug,而是LogCat中的每次的Msg輸出是有上限的，坑的我好慘啊，查了資料才發現,.原來logcat在實現上對於message的記憶體分配大概是4k左右.所以超過的內容都直接被丟棄;

於是自己封裝了一個屬於自己的LogUtil類，程式碼如下:

public class LogUtil {

    //可以全域性控制是否列印log日誌
    private static boolean isPrintLog = true;
    private static int LOG_MAXLENGTH = 2000;


    public static void v(String msg) {
        v("LogUtil", msg);
    }

    public static void v(String tagName, String msg) {
        if (isPrintLog) {
            int strLength = msg.length();
            int start = 0;
            int end = LOG_MAXLENGTH;
            for (int i = 0; i < 100; i++) {
                if (strLength > end) {
                    Log.v(tagName + i, msg.substring(start, end));
                    start = end;
                    end = end + LOG_MAXLENGTH;
                } else {
                    Log.v(tagName + i, msg.substring(start, strLength));
                    break;
                }
            }
        }
    }

    public static void d(String msg) {
        d("LogUtil", msg);
    }
    public static void d(String tagName, String msg) {
        if (isPrintLog) {
            int strLength = msg.length();
            int start = 0;
            int end = LOG_MAXLENGTH;
            for (int i = 0; i < 100; i++) {
                if (strLength > end) {
                    Log.d(tagName + i, msg.substring(start, end));
                    start = end;
                    end = end + LOG_MAXLENGTH;
                } else {
                    Log.d(tagName + i, msg.substring(start, strLength));
                    break;
                }
            }
        }
    }

    public static void i(String msg) {
        i("LogUtil", msg);
    }

    public static void i(String tagName, String msg) {
        if (isPrintLog) {
            int strLength = msg.length();
            int start = 0;
            int end = LOG_MAXLENGTH;
            for (int i = 0; i < 100; i++) {
                if (strLength > end) {
                    Log.i(tagName + i, msg.substring(start, end));
                    start = end;
                    end = end + LOG_MAXLENGTH;
                } else {
                    Log.i(tagName + i, msg.substring(start, strLength));
                    break;
                }
            }
        }
    }

    public static void w(String msg) {
        w("LogUtil", msg);
    }

    public static void w(String tagName, String msg) {
        if (isPrintLog) {
            int strLength = msg.length();
            int start = 0;
            int end = LOG_MAXLENGTH;
            for (int i = 0; i < 100; i++) {
                if (strLength > end) {
                    Log.w(tagName + i, msg.substring(start, end));
                    start = end;
                    end = end + LOG_MAXLENGTH;
                } else {
                    Log.w(tagName + i, msg.substring(start, strLength));
                    break;
                }
            }
        }
    }

    public static void e(String msg) {
        e("LogUtil", msg);
    }
    public static void e(String tagName, String msg) {
        if (isPrintLog) {
            int strLength = msg.length();
            int start = 0;
            int end = LOG_MAXLENGTH;
            for (int i = 0; i < 100; i++) {
                if (strLength > end) {
                    Log.e(tagName + i, msg.substring(start, end));
                    start = end;
                    end = end + LOG_MAXLENGTH;
                } else {
                    Log.e(tagName + i, msg.substring(start, strLength));
                    break;
                }
            }
        }
    }

}
 

問題解決了，做個筆記。