You need to use the signature tool of Android.

Examples used:

1. Open the apk of qq20 1 1 with ES editor or similar tools.

2. Visit the res folder, find the raw folder and open it;

3. Replace the msg message prompt file, such as singing birds;

4. Open the meta-inf folder, keep the manifest.mf in it, and delete all other files;

5. Run this software, click the "Enter" button, and select the newly modified file;

6. Fill in the required name in the signature output box;

7. You can install the modified qq after signing the document. Note that the original version must be uninstalled first, otherwise the installation may fail.

thank you