android VitualXposed 模块编写

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

<application>
	<meta-data
        android:name="xposedmodule"
        android:value="true" />
    <meta-data
        android:name="xposeddescription"
        android:value="this is a xposed demo" />
    <meta-data
        android:name="xposedminversion"
        android:value="30" />
</application>

public class MainActivity extends AppCompatActivity {

    private Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this, toastMessage(), Toast.LENGTH_SHORT).show();
            }
        });
    }
    public String toastMessage() {
        return "我没有被劫持";
    }
}

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <Button
        android:id="@+id/btn"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="btn"/>

</android.support.constraint.ConstraintLayout>

public class HookToast implements IXposedHookLoadPackage {
    @Override
    public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam) throws Throwable {
        if (lpparam.packageName.equals("com.demo.myapplication")){
            Class clazz = lpparam.classLoader.loadClass("com.demo.myapplication.MainActivity");
            XposedHelpers.findAndHookMethod(clazz, "toastMessage", new XC_MethodHook() {
                @Override
                protected void beforeHookedMethod(MethodHookParam param) throws Throwable { //hook之前
//                    super.beforeHookedMethod(param);
                    XposedBridge.log("you are been hooked"); 
                }

                @Override
                protected void afterHookedMethod(MethodHookParam param) throws Throwable { // hook之后
//                    super.afterHookedMethod(param);
                    param.setResult("hacked by tea"); //改变返回结果 
                }
            });
        }
    }
}