inject log info to apk

crack.java

import java.io.*;
import java.util.Arrays;
public class crack{
  public static void puts(Object s){
    try{
      String path= "/sdcard/debug.txt";
      FileOutputStream outStream = new FileOutputStream(path,true);
      OutputStreamWriter writer = new OutputStreamWriter(outStream,"gb2312");
      writer.write(s.toString());
      writer.write("\r\n");
      writer.flush();
      writer.close();
      outStream.close(); 
    } 
    catch (Exception e){
    } 
  }
  public static void puts(Object s,String tag){
    try{
      String path= "/sdcard/debug.txt";
      FileOutputStream outStream = new FileOutputStream(path,true);
      OutputStreamWriter writer = new OutputStreamWriter(outStream,"gb2312");
      writer.write(tag);
      writer.write(" : ");
      writer.write(s.toString());
      writer.write("\r\n");
      writer.flush();
      writer.close();
      outStream.close(); 
    } 
    catch (Exception e){
    } 
  }
  public static void puts(Object[] s,String tag){
    try{
      String path= "/sdcard/debug.txt";
      FileOutputStream outStream = new FileOutputStream(path,true);
      OutputStreamWriter writer = new OutputStreamWriter(outStream,"gb2312");
      writer.write(tag);
      writer.write(" : ");
      writer.write(Arrays.toString(s));
      writer.write("\r\n");
      writer.flush();
      writer.close();
      outStream.close(); 
    } 
    catch (Exception e){
    } 
  }
  public static void main(String [] args){
    StringBuilder m = new StringBuilder("test log");
    StringBuilder[] l = new StringBuilder[2];
    l[0] = new StringBuilder("test log0");
    l[1] = new StringBuilder("test log1");
    crack.puts(m);
    crack.puts(m,"tag");
    crack.puts(l,"tag");
  }
    
}

crack.smali

.class public Lcrack;
.super Ljava/lang/Object;
.source "crack.java"


# direct methods
.method public constructor <init>()V
    .registers 1

    .prologue
    .line 3
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    return-void
.end method

.method public static main([Ljava/lang/String;)V
    .registers 6

    .prologue
    .line 51
    new-instance v0, Ljava/lang/StringBuilder;

    const-string v1, "test log"

    invoke-direct {v0, v1}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V

    .line 52
    const/4 v1, 0x2

    new-array v1, v1, [Ljava/lang/StringBuilder;

    .line 53
    const/4 v2, 0x0

    new-instance v3, Ljava/lang/StringBuilder;

    const-string v4, "test log0"

    invoke-direct {v3, v4}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V

    aput-object v3, v1, v2

    .line 54
    const/4 v2, 0x1

    new-instance v3, Ljava/lang/StringBuilder;

    const-string v4, "test log1"

    invoke-direct {v3, v4}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V

    aput-object v3, v1, v2

    .line 55
    invoke-static {v0}, Lcrack;->puts(Ljava/lang/Object;)V

    .line 56
    const-string v2, "tag"

    invoke-static {v0, v2}, Lcrack;->puts(Ljava/lang/Object;Ljava/lang/String;)V

    .line 57
    const-string v0, "tag"

    invoke-static {v1, v0}, Lcrack;->puts([Ljava/lang/Object;Ljava/lang/String;)V

    .line 58
    return-void
.end method

.method public static puts(Ljava/lang/Object;)V
    .registers 4

    .prologue
    .line 6
    :try_start_0
    const-string v0, "/sdcard/debug.txt"

    .line 7
    new-instance v1, Ljava/io/FileOutputStream;

    const/4 v2, 0x1

    invoke-direct {v1, v0, v2}, Ljava/io/FileOutputStream;-><init>(Ljava/lang/String;Z)V

    .line 8
    new-instance v0, Ljava/io/OutputStreamWriter;

    const-string v2, "gb2312"

    invoke-direct {v0, v1, v2}, Ljava/io/OutputStreamWriter;-><init>(Ljava/io/OutputStream;Ljava/lang/String;)V

    .line 9
    invoke-virtual {p0}, Ljava/lang/Object;->toString()Ljava/lang/String;

    move-result-object v2

    invoke-virtual {v0, v2}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 10
    const-string v2, "\r\n"

    invoke-virtual {v0, v2}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 11
    invoke-virtual {v0}, Ljava/io/OutputStreamWriter;->flush()V

    .line 12
    invoke-virtual {v0}, Ljava/io/OutputStreamWriter;->close()V

    .line 13
    invoke-virtual {v1}, Ljava/io/FileOutputStream;->close()V
    :try_end_24
    .catch Ljava/lang/Exception; {:try_start_0 .. :try_end_24} :catch_25

    .line 17
    :goto_24
    return-void

    .line 15
    :catch_25
    move-exception v0

    goto :goto_24
.end method

.method public static puts(Ljava/lang/Object;Ljava/lang/String;)V
    .registers 5

    .prologue
    .line 20
    :try_start_0
    const-string v0, "/sdcard/debug.txt"

    .line 21
    new-instance v1, Ljava/io/FileOutputStream;

    const/4 v2, 0x1

    invoke-direct {v1, v0, v2}, Ljava/io/FileOutputStream;-><init>(Ljava/lang/String;Z)V

    .line 22
    new-instance v0, Ljava/io/OutputStreamWriter;

    const-string v2, "gb2312"

    invoke-direct {v0, v1, v2}, Ljava/io/OutputStreamWriter;-><init>(Ljava/io/OutputStream;Ljava/lang/String;)V

    .line 23
    invoke-virtual {v0, p1}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 24
    const-string v2, " : "

    invoke-virtual {v0, v2}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 25
    invoke-virtual {p0}, Ljava/lang/Object;->toString()Ljava/lang/String;

    move-result-object v2

    invoke-virtual {v0, v2}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 26
    const-string v2, "\r\n"

    invoke-virtual {v0, v2}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 27
    invoke-virtual {v0}, Ljava/io/OutputStreamWriter;->flush()V

    .line 28
    invoke-virtual {v0}, Ljava/io/OutputStreamWriter;->close()V

    .line 29
    invoke-virtual {v1}, Ljava/io/FileOutputStream;->close()V
    :try_end_2c
    .catch Ljava/lang/Exception; {:try_start_0 .. :try_end_2c} :catch_2d

    .line 33
    :goto_2c
    return-void

    .line 31
    :catch_2d
    move-exception v0

    goto :goto_2c
.end method

.method public static puts([Ljava/lang/Object;Ljava/lang/String;)V
    .registers 5

    .prologue
    .line 36
    :try_start_0
    const-string v0, "/sdcard/debug.txt"

    .line 37
    new-instance v1, Ljava/io/FileOutputStream;

    const/4 v2, 0x1

    invoke-direct {v1, v0, v2}, Ljava/io/FileOutputStream;-><init>(Ljava/lang/String;Z)V

    .line 38
    new-instance v0, Ljava/io/OutputStreamWriter;

    const-string v2, "gb2312"

    invoke-direct {v0, v1, v2}, Ljava/io/OutputStreamWriter;-><init>(Ljava/io/OutputStream;Ljava/lang/String;)V

    .line 39
    invoke-virtual {v0, p1}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 40
    const-string v2, " : "

    invoke-virtual {v0, v2}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 41
    invoke-static {p0}, Ljava/util/Arrays;->toString([Ljava/lang/Object;)Ljava/lang/String;

    move-result-object v2

    invoke-virtual {v0, v2}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 42
    const-string v2, "\r\n"

    invoke-virtual {v0, v2}, Ljava/io/OutputStreamWriter;->write(Ljava/lang/String;)V

    .line 43
    invoke-virtual {v0}, Ljava/io/OutputStreamWriter;->flush()V

    .line 44
    invoke-virtual {v0}, Ljava/io/OutputStreamWriter;->close()V

    .line 45
    invoke-virtual {v1}, Ljava/io/FileOutputStream;->close()V
    :try_end_2c
    .catch Ljava/lang/Exception; {:try_start_0 .. :try_end_2c} :catch_2d

    .line 49
    :goto_2c
    return-void

    .line 47
    :catch_2d
    move-exception v0

    goto :goto_2c
.end method