Main Steps

1. Modify Manifest.xml

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
  package="com.arophix.xposedmodule">  

 <application  android:icon="@mipmap/ic_launcher"  
  android:label="@string/app_name">  
 <meta-data  android:name="xposedmodule"  
  android:value="true" />  
 <meta-data  android:name="xposeddescription"  
  android:value="Xposed module hooking example" />  
 <meta-data  android:name="xposedminversion"  
  android:value="53" />  
 </application>  
</manifest>

2. Add xposed_init

Add an Xposed initialisation file under assets folder, i.e. ~/XposedHooking/xposedmodule/src/main/assets/xposed_init

Add the full package name for the hooking module, e.g.

com.arophix.xposedmodule.XposedModuleExample

3. Hooking module class

Let the hooking module class implement interface IXposedHookLoadPackage.

public class XposedModuleExample implements IXposedHookLoadPackage { ... }

Example for hooking a method with arguments

findAndHookMethod("com.arophix.xposedhooking.DummyPerson", lpparam.classLoader, "getFullName", "java.lang.String", "java.lang.String", new XC_MethodHook() {  
    @Override  
  protected void beforeHookedMethod(XC_MethodHook.MethodHookParam param) throws Throwable {  
        // this will be called before the clock was updated by the original method  
  XposedBridge.log("2 Before ===>>> DummyPerson$getFullName is hooked: " + param.getClass().getSimpleName());  
  XposedBridge.log("2 Before ===>>> param.args[0]:  " + param.args[0]);  
  XposedBridge.log("2 Before ===>>> param.args[1]:  " + param.args[1]);  
  param.args[0] = "I am from Xposedmodule :)";  
  }  
    @Override  
  protected void afterHookedMethod(MethodHookParam param) throws Throwable {  
        XposedBridge.log("2 After ===>>>  DummyPerson$getFullName is hooked: " + param.getClass().getSimpleName());  
  XposedBridge.log("2 After ===>>>  param.args[0]:  " + param.args[0]);  
  XposedBridge.log("2 After ===>>>  param.args[1]:  " + param.args[1]);  
  }  
});

Notes

1. The argument type need to be a full qualified class name, e.g. java.lang.String.
2. XC_LoadPackage.LoadPackageParam lpparam is the wrapper of information about the app being loaded.
3. Using applicationId as a filter for hooking process, e.g.

    // The `applicationId` is configured inside `app/build.gradle`  
    if (!lpparam.packageName.equals("com.arophix.xposedhooking")) {  
        XposedBridge.log("1 findAndHookMethod for " + lpparam.packageName);  
        return;
    }
   

4. Install XposedModuleExample

Set the Launch Options to Nothing, see below screenshot:

5. Soft reboot device and activate your Xposed module

When install the XposedModuleExample, device will pop up a notification as below.

And ensure the tick box is checked.

6. Example project

Have a copy from my github: https://github.com/russell-shizhen/AndroidXposedHook