<EditText
android:id=”@+id/restriction”
android:layout_width=”match_parent”
android:layout_height=”wrap_content”
android:hint=”只允許輸入電子郵件地址”
android:textSize=”16sp” />

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ch0119_main);
final EditText et = (EditText) findViewById(R.id.restriction);

// 建立電子郵件位址用的Filter
InputFilter inputFilter = new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
if (source.toString().matches(“^[0-9a-zA-Z@\\.\\_\\-]+$”)) {
return source;
} else {
return “”;
}
}
};

// //將Filter加入陣列
InputFilter[] filters = new InputFilter[] { inputFilter };
// 套用Filter
et.setFilters(filters);

}