Simple demo of Android reverse /hook

what is xposed

Xposed is a special Android application. By replacing the files such as app_process witch under system\bin\Process to control the zygote process, so as to control all the app processes on the mobile phone; the disadvantage is that it can't hook the functions in the so application

how to install xposed

refer to Install xposed for Android phone

a demo for xposed

1. create a new Android project
2. modify(alter, change? I dont konw..)the AndroidManifest,xml

<!-- Whether it is an xposed module. Xposed judges whether it is a module based on this
        <meta-data
            android:name="xposedmodule"
            android:value="true" />

        <!-- The module description -->
        <meta-data
            android:name="xposeddescription"
            android:value="xposed demo" />

        <!-- The minimum version supported is 30-->
        <meta-data
            android:name="xposedminversion"
            android:value="30" />

3.add dependency
open buile.gradle (module:app)File, add the following code in it:

 compileOnly 'de.robv.android.xposed:api:82'
 compileOnly 'de.robv.android.xposed:api:82:sources'

1. IXposedHookLoadPackage
   Create a new Java class(MainIntercept) and implements Ixposedhookloadpackage and override the handleloadpackage method

2. xposed_init
   Create an assets under Src/Mian, add xposed_init under it,, the code inside is your hook class package name + class name

3. Rewrite the Mainactivity code as follows:
   

 public class MainActivity extends BaseActivity

    private TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ............
        textView.setText(getText());
        ............
    }

    private String getText(){
          return "-----ha ha !!-----";
    }

}

6.change the code in MainIntercept:

public class MainIntercept implements IXposedHookLoadPackage {

    @Override
     public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam) throws Throwable {
    if(!lpparam.packageName.equals("com.xxx.xxx")) return;

  XposedHelpers.findAndHookMethod("com.xxx.xxx.xxx.MainActivity", lpparam.classLoader, "getText", new XC_MethodHook() {

            @Override
            protected void afterHookedMethod(MethodHookParam param) throws Throwable {
                super.afterHookedMethod(param);
                param.setResult("----I was changed-----");
            }

        });

    }
}

7.Rebuild, select the app in xposedinstaller and restart it

8.after restart the app,When this method is executed，you will see the result is '----I was changed-----' instead of '-----ha ha !!-----'