KeyListener,NumberKeyListner

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,

TimeKeyListener

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

});

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