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For more information about the code, see: http://www.cookiechoices.org/ 

For Android:

============

// This code works on Android API level 1 (Android 1.0) and up.
// Tested on the latest (at the moment) API level 19 (Android 4.4 KitKat).
// In the main activity of your app:

public class MainActivity extends Activity {

(...)

@Override public void onStart() { super.onStart(); final SharedPreferences settings =
getSharedPreferences("localPreferences", MODE_PRIVATE);
if (settings.getBoolean("isFirstRun", true)) { new AlertDialog.Builder(this)
.setTitle("Cookies")
.setMessage("Your message for visitors here")
.setNeutralButton("Close message", new OnClickListener() { @Override
public void onClick(DialogInterface dialog, int which) {
settings.edit().putBoolean("isFirstRun", false).commit();
} }).show(); } } }