各路径说明:
// getFilesDir()().getPath(): /data/user/0/com.lanmeng.test/files 与 /data/data/com.lanmeng
// .test/files/ 同路径,不依赖WRITE_EXTERNAL_STORAGE permission
Log.d(TAG, "getFilesDir().getPath(): " + getFilesDir().getPath());
///data/user/0/com.lanmeng.test/cache
Log.d(TAG, "getCacheDir().getPath(): " + getCacheDir().getPath());
// /storage/emulated/0/Android/data/com.lanmeng.test/cache
Log.d(TAG, "getExternalCacheDir().getPath(): " + getExternalCacheDir().getPath());