使用友盟组件,android混淆后程序报错解决方案

     这几天在对程序进行混淆处理测试时,在程序中使用了友盟组件的地方会报错,比如自动更新,报错异常如:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example/com.umeng.update.UpdateDialogActivity}: java.lang.IllegalArgumentException: ResClass is not initialized. Please make sure you have added neccessary resources. Also make sure you have com.example.R$* configured in obfuscation. field=umeng_update_dialog
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
	at android.app.ActivityThread.access$600(ActivityThread.java:130)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:137)
	at android.app.ActivityThread.main(ActivityThread.java:4745)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:511)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
	at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: ResClass is not initialized. Please make sure you have added neccessary resources. Also make sure you have com.example.R$* configured in obfuscation. field=umeng_update_dialog
	at com.umeng.common.Res.a(Unknown Source)
	at com.umeng.common.Res.d(Unknown Source)
	at com.umeng.update.UpdateDialogActivity.onCreate(Unknown Source)
	at android.app.Activity.performCreate(Activity.java:5008)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
     解决思路:

使用了混淆, 请添加

-keepclassmembers class * {
		   public (org.json.JSONObject);
	}
这是由于SDK中的部分代码使用反射来调用构造函数, 如果被混淆掉, 在运行时会提示"NoSuchMethod"错误。 另外,由于SDK需要引用导入工程的资源文件,通过了反射机制得到资源引用文件R.java,但是在开发者通过proguard等混淆/优化工具处理apk时,proguard可能会将R.java删除,如果遇到这个问题,请在proguard配置文件中添加keep命令如:
-keep public class [您的应用包名].R$*{
		public static final int *;
	}
把[您的应用包名] 替换成您自己的包名,如com.yourcompany.example。 如果您使用了双向反馈功能,还需要添加下面代码,以免我们自定义的UI被混淆:
-keep public class com.umeng.fb.ui.ThreadView {
	}
      在proguadr-android.txt文件中,添加如下代码:
-keepclassmembers class * {
  	 public (org.json.JSONObject);
	}
	-keep public class com.example.R$*{
		public static final int *;
	}
    至此,问题解决

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