ProGuard-Java代码混淆（把类和变量混淆成诸如abcdefg的样子）
首先下载混淆工具：
http://proguard.sourceforge.net/downloads.html
如果你是初学者，又急于使用混淆功能，不用去找其他什么工具了，就这个就够了。
第一步：将我们的代码从eclipse中以普通export的方式导出成一个jar包，只导出src中的代码，其他钩全部去掉，右边的那些资源文件什么的也要去掉钩。导出之后放在桌面，直到混淆完成之前都不要移动这个jar包。 
第二步：打开我们的混淆工具之后，点击Input/Output，然后Add Input，选择我们刚才export的那个jar，然后点击Add Output，选择混淆之后的jar输出路径和文件名，这里也放在桌面。 
第三步，在桌面新建一个lib文件夹，将我们在第一步里标注的libs里面引用到的jar全部找出来，放在桌面的lib文件夹里。然后点击右边的Add，将这些jar文件添加进去。 
第四步，点击process，然后点击save configuration，保存配置文件到桌面。然后编辑这个文件，添加：
-optimizationpasses 5 # 指定代码的压缩级别
-dontusemixedcaseclassnames # 是否使用大小写混合
-dontpreverify # 混淆时是否做预校验
-verbose # 混淆时是否记录日志
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/* # 混淆时所采用的算法
-keep class com.vzone.tmdsdk.TMDAgent {*;}#不要混淆我们的入口类
-keep public class * extends android.app.Activity # 保持哪些类不被混淆
-keep public class * extends android.app.Application # 保持哪些类不被混淆
-keep public class * extends android.app.Service # 保持哪些类不被混淆
-keep public class * extends android.content.BroadcastReceiver # 保持哪些类不被混淆
-keep public class * extends android.content.ContentProvider # 保持哪些类不被混淆
-keep public class * extends android.app.backup.BackupAgentHelper # 保持哪些类不被混淆
-keep public class * extends android.preference.Preference # 保持哪些类不被混淆
-keep public class com.android.vending.licensing.ILicensingService # 保持哪些类不被混淆保存该配置文件
第五步， 点击Proguard按钮，点击Load configration按钮，导入上面配置好的混淆文件。点击左边的Process，点击右下角的Process!，直到完成，搞定。
完整配置文件参考：
-injars tmdsdk.jar
-outjars tmdsdk-mixed.jar
-libraryjars 'D:\software\jdk\jre\lib\rt.jar'
-libraryjars lib\android-support-v4.jar
-libraryjars lib\android.jar
-optimizationpasses 5 # 指定代码的压缩级别
-dontusemixedcaseclassnames # 是否使用大小写混合
-dontpreverify # 混淆时是否做预校验
-verbose # 混淆时是否记录日志
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/* # 混淆时所采用的算法
-keep class com.vzone.tmdsdk.TMDAgent {*;}
-keep public class * extends android.app.Activity # 保持哪些类不被混淆
-keep public class * extends android.app.Application # 保持哪些类不被混淆
-keep public class * extends android.app.Service # 保持哪些类不被混淆
-keep public class * extends android.content.BroadcastReceiver # 保持哪些类不被混淆
-keep public class * extends android.content.ContentProvider # 保持哪些类不被混淆
-keep public class * extends android.app.backup.BackupAgentHelper # 保持哪些类不被混淆
-keep public class * extends android.preference.Preference # 保持哪些类不被混淆
-keep public class com.android.vending.licensing.ILicensingService # 保持哪些类不被混淆
-keepclasseswithmembernames class * { # 保持 native 方法不被混淆
native ;
}
-keepclasseswithmembers class * { # 保持自定义控件类不被混淆
public (android.content.Context, android.util.AttributeSet);
}
-keepclasseswithmembers class * {# 保持自定义控件类不被混淆
public (android.content.Context, android.util.AttributeSet, int);
}
-keepclassmembers class * extends android.app.Activity { # 保持自定义控件类不被混淆
public void *(android.view.View);
}
-keepclassmembers enum * { # 保持枚举 enum 类不被混淆
public static **[] values();
public static ** valueOf(java.lang.String);
}
-keep class * implements android.os.Parcelable { # 保持 Parcelable 不被混淆
public static final android.os.Parcelable$Creator *;
}
# Keep - Applications. Keep all application classes, along with their 'main'
# methods.
-keepclasseswithmembers public class * {
public static void main(java.lang.String[]);
}
# Also keep - Enumerations. Keep the special static methods that are required in
# enumeration classes.
-keepclassmembers enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}
# Also keep - Database drivers. Keep all implementations of java.sql.Driver.
-keep class * extends java.sql.Driver
# Also keep - Swing UI L&F. Keep all extensions of javax.swing.plaf.ComponentUI,
# along with the special 'createUI' method.
-keep class * extends javax.swing.plaf.ComponentUI {
public static javax.swing.plaf.ComponentUI createUI(javax.swing.JComponent);
}
# Keep names - Native method names. Keep all native class/method names.
-keepclasseswithmembers,includedescriptorclasses,allowshrinking class * {
native ;
}
# Remove - System method calls. Remove all invocations of System
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.System {
public static long currentTimeMillis();
static java.lang.Class getCallerClass();
public static int identityHashCode(java.lang.Object);
public static java.lang.SecurityManager getSecurityManager();
public static java.util.Properties getProperties();
public static java.lang.String getProperty(java.lang.String);
public static java.lang.String getenv(java.lang.String);
public static java.lang.String mapLibraryName(java.lang.String);
public static java.lang.String getProperty(java.lang.String,java.lang.String);
}
# Remove - Math method calls. Remove all invocations of Math
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.Math {
public static double sin(double);
public static double cos(double);
public static double tan(double);
public static double asin(double);
public static double acos(double);
public static double atan(double);
public static double toRadians(double);
public static double toDegrees(double);
public static double exp(double);
public static double log(double);
public static double log10(double);
public static double sqrt(double);
public static double cbrt(double);
public static double IEEEremainder(double,double);
public static double ceil(double);
public static double floor(double);
public static double rint(double);
public static double atan2(double,double);
public static double pow(double,double);
public static int round(float);
public static long round(double);
public static double random();
public static int abs(int);
public static long abs(long);
public static float abs(float);
public static double abs(double);
public static int max(int,int);
public static long max(long,long);
public static float max(float,float);
public static double max(double,double);
public static int min(int,int);
public static long min(long,long);
public static float min(float,float);
public static double min(double,double);
public static double ulp(double);
public static float ulp(float);
public static double signum(double);
public static float signum(float);
public static double sinh(double);
public static double cosh(double);
public static double tanh(double);
public static double hypot(double,double);
public static double expm1(double);
public static double log1p(double);
}
# Remove - Number method calls. Remove all invocations of Number
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.* extends java.lang.Number {
public static java.lang.String toString(byte);
public static java.lang.Byte valueOf(byte);
public static byte parseByte(java.lang.String);
public static byte parseByte(java.lang.String,int);
public static java.lang.Byte valueOf(java.lang.String,int);
public static java.lang.Byte valueOf(java.lang.String);
public static java.lang.Byte decode(java.lang.String);
public int compareTo(java.lang.Byte);
public static java.lang.String toString(short);
public static short parseShort(java.lang.String);
public static short parseShort(java.lang.String,int);
public static java.lang.Short valueOf(java.lang.String,int);
public static java.lang.Short valueOf(java.lang.String);
public static java.lang.Short valueOf(short);
public static java.lang.Short decode(java.lang.String);
public static short reverseBytes(short);
public int compareTo(java.lang.Short);
public static java.lang.String toString(int,int);
public static java.lang.String toHexString(int);
public static java.lang.String toOctalString(int);
public static java.lang.String toBinaryString(int);
public static java.lang.String toString(int);
public static int parseInt(java.lang.String,int);
public static int parseInt(java.lang.String);
public static java.lang.Integer valueOf(java.lang.String,int);
public static java.lang.Integer valueOf(java.lang.String);
public static java.lang.Integer valueOf(int);
public static java.lang.Integer getInteger(java.lang.String);
public static java.lang.Integer getInteger(java.lang.String,int);
public static java.lang.Integer getInteger(java.lang.String,java.lang.Integer);
public static java.lang.Integer decode(java.lang.String);
public static int highestOneBit(int);
public static int lowestOneBit(int);
public static int numberOfLeadingZeros(int);
public static int numberOfTrailingZeros(int);
public static int bitCount(int);
public static int rotateLeft(int,int);
public static int rotateRight(int,int);
public static int reverse(int);
public static int signum(int);
public static int reverseBytes(int);
public int compareTo(java.lang.Integer);
public static java.lang.String toString(long,int);
public static java.lang.String toHexString(long);
public static java.lang.String toOctalString(long);
public static java.lang.String toBinaryString(long);
public static java.lang.String toString(long);
public static long parseLong(java.lang.String,int);
public static long parseLong(java.lang.String);
public static java.lang.Long valueOf(java.lang.String,int);
public static java.lang.Long valueOf(java.lang.String);
public static java.lang.Long valueOf(long);
public static java.lang.Long decode(java.lang.String);
public static java.lang.Long getLong(java.lang.String);
public static java.lang.Long getLong(java.lang.String,long);
public static java.lang.Long getLong(java.lang.String,java.lang.Long);
public static long highestOneBit(long);
public static long lowestOneBit(long);
public static int numberOfLeadingZeros(long);
public static int numberOfTrailingZeros(long);
public static int bitCount(long);
public static long rotateLeft(long,int);
public static long rotateRight(long,int);
public static long reverse(long);
public static int signum(long);
public static long reverseBytes(long);
public int compareTo(java.lang.Long);
public static java.lang.String toString(float);
public static java.lang.String toHexString(float);
public static java.lang.Float valueOf(java.lang.String);
public static java.lang.Float valueOf(float);
public static float parseFloat(java.lang.String);
public static boolean isNaN(float);
public static boolean isInfinite(float);
public static int floatToIntBits(float);
public static int floatToRawIntBits(float);
public static float intBitsToFloat(int);
public static int compare(float,float);
public boolean isNaN();
public boolean isInfinite();
public int compareTo(java.lang.Float);
public static java.lang.String toString(double);
public static java.lang.String toHexString(double);
public static java.lang.Double valueOf(java.lang.String);
public static java.lang.Double valueOf(double);
public static double parseDouble(java.lang.String);
public static boolean isNaN(double);
public static boolean isInfinite(double);
public static long doubleToLongBits(double);
public static long doubleToRawLongBits(double);
public static double longBitsToDouble(long);
public static int compare(double,double);
public boolean isNaN();
public boolean isInfinite();
public int compareTo(java.lang.Double);
public byte byteValue();
public short shortValue();
public int intValue();
public long longValue();
public float floatValue();
public double doubleValue();
public int compareTo(java.lang.Object);
public boolean equals(java.lang.Object);
public int hashCode();
public java.lang.String toString();
}
# Remove - String method calls. Remove all invocations of String
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.String {
public static java.lang.String copyValueOf(char[]);
public static java.lang.String copyValueOf(char[],int,int);
public static java.lang.String valueOf(boolean);
public static java.lang.String valueOf(char);
public static java.lang.String valueOf(char[]);
public static java.lang.String valueOf(char[],int,int);
public static java.lang.String valueOf(double);
public static java.lang.String valueOf(float);
public static java.lang.String valueOf(int);
public static java.lang.String valueOf(java.lang.Object);
public static java.lang.String valueOf(long);
public boolean contentEquals(java.lang.StringBuffer);
public boolean endsWith(java.lang.String);
public boolean equalsIgnoreCase(java.lang.String);
public boolean equals(java.lang.Object);
public boolean matches(java.lang.String);
public boolean regionMatches(boolean,int,java.lang.String,int,int);
public boolean regionMatches(int,java.lang.String,int,int);
public boolean startsWith(java.lang.String);
public boolean startsWith(java.lang.String,int);
public byte[] getBytes();
public byte[] getBytes(java.lang.String);
public char charAt(int);
public char[] toCharArray();
public int compareToIgnoreCase(java.lang.String);
public int compareTo(java.lang.Object);
public int compareTo(java.lang.String);
public int hashCode();
public int indexOf(int);
public int indexOf(int,int);
public int indexOf(java.lang.String);
public int indexOf(java.lang.String,int);
public int lastIndexOf(int);
public int lastIndexOf(int,int);
public int lastIndexOf(java.lang.String);
public int lastIndexOf(java.lang.String,int);
public int length();
public java.lang.CharSequence subSequence(int,int);
public java.lang.String concat(java.lang.String);
public java.lang.String replaceAll(java.lang.String,java.lang.String);
public java.lang.String replace(char,char);
public java.lang.String replaceFirst(java.lang.String,java.lang.String);
public java.lang.String[] split(java.lang.String);
public java.lang.String[] split(java.lang.String,int);
public java.lang.String substring(int);
public java.lang.String substring(int,int);
public java.lang.String toLowerCase();
public java.lang.String toLowerCase(java.util.Locale);
public java.lang.String toString();
public java.lang.String toUpperCase();
public java.lang.String toUpperCase(java.util.Locale);
public java.lang.String trim();
}
# Remove - StringBuffer method calls. Remove all invocations of StringBuffer
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.StringBuffer {
public java.lang.String toString();
public char charAt(int);
public int capacity();
public int codePointAt(int);
public int codePointBefore(int);
public int indexOf(java.lang.String,int);
public int lastIndexOf(java.lang.String);
public int lastIndexOf(java.lang.String,int);
public int length();
public java.lang.String substring(int);
public java.lang.String substring(int,int);
}
# Remove - StringBuilder method calls. Remove all invocations of StringBuilder
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.StringBuilder {
public java.lang.String toString();
public char charAt(int);
public int capacity();
public int codePointAt(int);
public int codePointBefore(int);
public int indexOf(java.lang.String,int);
public int lastIndexOf(java.lang.String);
public int lastIndexOf(java.lang.String,int);
public int length();
public java.lang.String substring(int);
public java.lang.String substring(int,int);
}
参考链接：http://blog.csdn.net/android_panda/article/details/18604121#comments
https://blog.csdn.net/ithouse/article/details/51605955