How to record/read integer in the file - android

[tahishae]

How to record/read variable integer in a file from external storage

[emran]

Integer myInteger = Integer.valueOf(10);

File file = new File(Environment.getExternalStorageDirectory(), "myfile.dat");

// запись
DataOutputStream out = null;
try {
    out = new DataOutputStream(new FileOutputStream(file));
    out.writeInt(myInteger.intValue());
} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
} finally {
    if (out != null) {
        try {
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

// чтение
DataInputStream in = null;
try {
    in = new DataInputStream(new FileInputStream(file));
    Integer myReadInt = Integer.valueOf(in.readInt());
} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
} finally {
    if (in != null) {
        try {
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Permits are also required:

<manifest ...>
&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;
&lt;uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /&gt;

</manifest>

Before recording/reference, it is better to check the availability of the vault:

public boolean isExternalStorageWritable() {

String state = Environment.getExternalStorageState();

if (Environment.MEDIA_MOUNTED.equals(state)) {

return true;

}

return false;

}

public boolean isExternalStorageReadable() {

String state = Environment.getExternalStorageState();

if (Environment.MEDIA_MOUNTED.equals(state) ||

Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {

return true;

}

return false;

}