A java method hook library for android dalvik
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ZHookLib
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README.md

README.md

ZHookLib

A java hook library for android, it contains a so and a jar file.

And the part of the code copy from xposed

It is compatible with android 2.3-4.4.

The art mode support will come soon!

API:

com.morgoo.hook.zhook.ZHook class:

Hook method:

public static MethodHook.Unhook hookMethod(Member hookMethod, MethodHook callback)
    
public static Set<MethodHook.Unhook> hookAllMethods(Class<?> hookClass,
		String methodName, MethodHook callback)
		
public static MethodHook.Unhook findAndHookMethod(Class<?> clazz,
		String methodName, Object... parameterTypesAndCallback)
		
public static MethodHook.Unhook findAndHookMethod(String className,
		ClassLoader classLoader, String methodName,
		Object... parameterTypesAndCallback)

Hook constructor:

public static Set<MethodHook.Unhook> hookAllConstructors(
		Class<?> hookClass, MethodHook callback)           

Check method has been or not hooked:

public static boolean isMethodHooked(Member method)

unhook:

public static void unhookMethod(Member hookMethod, MethodHook callback)

invoke original method:

public static Object invokeOriginalMethod(Member method, Object thisObject,
		Object[] args)

sample:

Define a class in HookTest.java:

public class HookTest{
    
    private static final String TAG = HookTest.class.getSimpleName();
    
    public HookTest() {
        Log.e(TAG,"Create");
    }

    private int test(int i) {
        Log.e(TAG, "i am in test(int i) re=" + i);
        return i;
    }

    private int test(int i, String t) {
        Log.e(TAG, "i am in test(int i, String t) re=" + i + ",t=" + t);
        return i;
    }

    private String test(String t) {
        Log.e(TAG, "i am in test(String t) t=" + t);
        return t;
    }

    private void test(String t, int i) {
        Log.e(TAG, "i am in test(String t, int i) t=" + t);
    } 
}

and write a main method for test:

 public static void main() {
    MethodHook callback = new MethodHook() {
        @Override
        protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
            super.beforeHookedMethod(param);
            Log.e("HookTest", "beforeHookedMethod " + param.method);
        }

        @Override
        protected void afterHookedMethod(MethodHookParam param) throws Throwable {
            super.afterHookedMethod(param);
            Object result = param.getResult();
            if (result instanceof String) {
                param.setResult("MyResult");
                Log.e("HookTest",
                        "afterHookedMethod " + param.method + ",getThrowable="
                                + param.getThrowable() + " we fake result as MyResult");
            } else if ((result instanceof Integer)) {
                param.setResult(1986);
                Log.e("HookTest",
                        "afterHookedMethod " + param.method + ",getThrowable="
                                + param.getThrowable() + " we fake result as 1986");
            } else {
                Log.e("HookTest",
                        "afterHookedMethod " + param.method + ",getResultOrThrowable="
                                + param.getResultOrThrowable());
            }

        }
    };
    
    
    Set<Unhook> unhooks1 = ZHook.hookAllConstructors(HookTest.class, callback);
    Set<Unhook> unhooks2 = ZHook.hookAllMethods(HookTest.class, "test", callback);

    HookTest hookTest = new HookTest();
    String msg1 = "i am run on hook: test(1) result=" + hookTest.test(1);
    Log.e("HookTest", msg1);

    String msg2 = "i am run on hook: test(1,fdfdf) result=" + hookTest.test(1, "fdfdf");
    Log.e("HookTest", msg2);

    String msg3 = "i am run on hook: test(1,fdfdf) result=" +
            hookTest.test("fdfdf");
    Log.e("HookTest", msg3);

    hookTest.test("fdfdf", 1);
    String msg4 = "i am run on hook: test(fdfdf,1) result=void";
    Log.e("HookTest", msg4);

    for (Unhook unhook : unhooks1) {
        unhook.unhook();
    }

    for (Unhook unhook : unhooks2) {
        unhook.unhook();
    }

    Log.e("HookTest", "i am run after unhook: test1(1) re=" + hookTest.test(1));
    Log.e("HookTest", "i am run after unhook: test1(1,fdfdf) re=" + hookTest.test(1, "fdfdf"));
    Log.e("HookTest", "i am run after unhook: test1(1,fdfdf) re=" + hookTest.test("fdfdf"));

}