Android Hooking a method


Example

Create a new class implementing IXposedHookLoadPackage and implement the handleLoadPackage method:

public class MultiPatcher implements IXposedHookLoadPackage
{
    @Override
    public void handleLoadPackage(XC_LoadPackage.LoadPackageParam loadPackageParam) throws Throwable
    {
        
    }
}

Inside the method, you check loadPackageParam.packageName for the package name of the app you want to hook:

@Override
public void handleLoadPackage(XC_LoadPackage.LoadPackageParam loadPackageParam) throws Throwable
{
    if (!loadPackageParam.packageName.equals("other.package.name"))
    {
        return;
    }
}

Now you can hook your method and either manipulate it before it's code is run, or after:

@Override
public void handleLoadPackage(XC_LoadPackage.LoadPackageParam loadPackageParam) throws Throwable
{
    if (!loadPackageParam.packageName.equals("other.package.name"))
    {
        return;
    }

    XposedHelpers.findAndHookMethod(
        "other.package.name",
        loadPackageParam.classLoader,
        "otherMethodName",
        YourFirstParameter.class,
        YourSecondParameter.class,
        new XC_MethodHook()
    {
        @Override
        protected void beforeHookedMethod(MethodHookParam param) throws Throwable
        {
            Object[] args = param.args;
        
            args[0] = true;
            args[1] = "example string";
            args[2] = 1;

            Object thisObject = param.thisObject;

            // Do something with the instance of the class
        }

        @Override
        protected void afterHookedMethod(MethodHookParam param) throws Throwable
        {
            Object result = param.getResult();

            param.setResult(result + "example string");
        }
    });
}