setTransformationMethod 的使用

1. 点击一个控件隐藏/显示 EditText 中的密码

final CheckBox checkbox = (CheckBox) findViewById(R.id.cb);
         /* add a listener to the CheckBox */
  checkbox.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){
      public void onCheckedChanged(CompoundButton buttonView,boolean isChecked){
              if(checkbox.isChecked()){
                  /* show the password*/
            	  textCarNumberNear.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
              }
              else{
                  /* hide the password */
            	  textCarNumberNear.setTransformationMethod(PasswordTransformationMethod.getInstance());   
              }         
      }      
   });

也可以使用：

if(isChecked){  
    //显示密码框内容  
    mEditPwd.setInputType(InputType.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_NORMAL);  
}else{  
    //隐藏密码框内容  
    mEditPwd.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);   
}  
mEditPwd.setSelection(mEditPwd.getText().toString().length());//设置光标位置在文本框末尾

这个里面是用来将输入到 EditText 中的小写字母转化为大写字母的

//----------------小写转化为大写--------------------------//
	public class InputLowerToUpper extends ReplacementTransformationMethod{ 
	    @Override 
	    protected char[] getOriginal() { 
	        char[] lower = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z' }; 
	        return lower; 
	    } 
	   
	    @Override 
	    protected char[] getReplacement() { 
	        char[] upper = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' }; 
	        return upper; 
	    } 
	   
	}

下面是使用的代码

final EditText textCarNumber=(EditText) viewNew.findViewById(R.id.borrow_carnumber);
		textCarNumber.setTransformationMethod(new InputLowerToUpper());