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Is the android app cache cleared after app force close by os?

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im building an android app and i need to save some files locally on the SD card. The question i want to ask is that does the android OS clear the app cache mnt/sdcard/Android/data/app_name/cache/* get cleared after the app is closed by the os due to lack of memory ( sigkill sent) ? In what conditions or when is the cache cleared. If the app needs to save some file safely where should it store them?
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