Method of accessing mobile phone storage location permission under non root condition

1.Manifest Apply for permission to read and write external files

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

2. The higher version requires dynamic permission application

int checkReadExternalPermission = checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE);
        int checkWriteExternalPermission = checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (checkReadExternalPermission != PackageManager.PERMISSION_GRANTED || checkWriteExternalPermission != PackageManager.PERMISSION_GRANTED) {
            requestPermissions(new String[] {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 0x01);
        }

3. If an error is reported and the file cannot be accessed , stay application Add

android:requestLegacyExternalStorage="true"

4. Note that sometimes the file cannot be read or written successfully because the file memory is too large