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Android Hooking: Writing Xposed Modules

1. Declare the module in AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.xpomodfc"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
          <meta-data
            android:name="xposedmodule"
            android:value="true" />
        <meta-data
            android:name="xposeddescription"
            android:value="List APP Modules and hook Some funtions" />
        <meta-data
            android:name="xposedminversion"
            android:value="30" />
    </application>

</manifest>

2. Create a text file called xposed_init (without .txt) in your assets folder with your main class as the content.

alt.com.TweakFC

& also create a directory named "lib" inside your project and  add XPosedBridgeAPI.jar in it.

Xposed Module Writing

3. Inject package loading process using handleLoadPackage() method

public void handleLoadPackage(final LoadPackageParam lpparam) throws Throwable {
    if (!lpparam.packageName.equals("com.android.systemui"))
        return;
    XposedBridge.log("we are in SystemUI!");
}

4. Hook and replace your methods of choice. Don't forget to static import this method:

import static de.robv.android.xposed.XposedHelpers.findAndHookMethod;

Run your code before/after a method. You can determine the returned result of the method using theMethodHookParam.

findAndHookMethod("com.example.android ", lpparam.classLoader, "isThisTheMethodToBeHooked", new XC_MethodHook() {
    @Override
    protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
        // this will be called before the original method is executed
        if (somethingHappens) {
            // modify the result of the original method
            param.setResult(false);
        }
    }

    @Override
    protected void afterHookedMethod(MethodHookParam param) throws Throwable {
        // this will be called after
    }
}
You can also replace the method completely. If the function has some params, make sure you include them in the findAndHookMethod function call.

findAndHookMethod("com.example.SomeClass", loadPackageParam.classLoader, "getAudioEnabled", Context.class, String.class, new XC_MethodReplacement() {
    @Override
    protected Object replaceHookedMethod(MethodHookParam param) throws Throwable {
        return true;
    }

});

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