android :KeyListener这个接口在android.text.method中
它有如下子类:
BaseKeyListener,DateKeyListener,DateTimeKeyListener,
DialerKeyListener,DigitsKeyListener,MultiTapKeyListener,
NumberKeyListener,QwertyKeyListener,TextKeyListener,
今天要使用KeyListener来让EditText只能输入某些字符，如数字，大小写a~z等等
keylistener有如下函数：
public int getInputType();
public boolean onKeyDown(View view, Editable text,
int keyCode, KeyEvent event);
public boolean onKeyUp(View view, Editable text,
int keyCode, KeyEvent event);
public boolean onKeyOther(View view, Editable text, KeyEvent event);
public void clearMetaKeyState(View view, Editable content, int states);
NumberKeyListener定义
public abstract class NumberKeyListener extends BaseKeyListener implements InputFilter
里面有一个抽象函数：protected abstract char[] getAcceptedChars();
这个函数就是用来编写自己想要输入的字符数据：
比如：
public char [] getAcceptedChars(){
char numberChars[] ={'0' , '1' ,'2' ,' 3' , ' 4' , '5' ,'6' ,' 7 ' , '8' , '9'};
return numberChars;
}
public char [] getAcceptedChars(){
char [] myChar ={'a','b','c','d','e','f','g','h','i'.......};
return myChar;
}
editText.setKeyListener(new numberKeyListener(){
..........
把抽象函数实现
});
