Moster 05 Read and Write files

[AnelCC]

Moster 05 Read and Write files

1. Save files to internal storage.

We using app.cacheDir for get the cache's address from the device.

      fun saveTextToFile(app: Application, json: String?) {
            val file = File(app.cacheDir, "monsters.json")
            file.writeText(json ?: "", Charsets.UTF_8)
        }

2. Read files from internal storage.

We using app.cacheDir for get the cache's address from the device and find the info saved before so we can read

        fun readTextFile(app: Application): String? {
            val file = File(app.cacheDir, "monsters.json")
            return if (file.exists()) {file.readText()} else null
        }

3. Manage permissions in a splash screen.

4. Request external storage permissions.

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

.......................

5. Save files to external storage

      fun saveTextToFile(app: Application, json: String?) {
            val file = File(app.getExternalFilesDir("monsters"), "monsters.json")
            file.writeText(json ?: "", Charsets.UTF_8)
        }

        fun readTextFile(app: Application): String? {
            val file = File(app.getExternalFilesDir("monsters"), "monsters.json")
            return if (file.exists()) {file.readText()} else null
        }