有时候经常会用到, 当输入框里有文字的时候, 点击一下就可以删除, 就像下图一样. 有时候是点击后面的图(这里图不是很准确,)是要显示隐藏的密码

这里就有两个东西要了解, 一个就是watch  editText的内容变化, 然后就是这是editText中密码文字可见.

首先, 监听文字变化,

 loginNameEditText = (EditText) findViewById(R.id.loginName);//注册监听器loginNameEditText.addTextChangedListener(myTextWatcher);/*** 添加文本内容改变监听器*/private TextWatcher myTextWatcherU = new TextWatcher(){@Overridepublic void onTextChanged(CharSequence s, int start, int before,int count){// TODO Auto-generated method stub// toastMgr.builder.display(s, 0);if (s.length() != 0){pet_login_user_clear = (Button) findViewById(R.id.pet_login_user_clear);pet_login_user_clear.setVisibility(View.VISIBLE);pet_login_user_clear.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v){// TODO Auto-generated method stubloginNameEditText.setText("");}});}}@Overridepublic void beforeTextChanged(CharSequence s, int start, int count,int after){// TODO Auto-generated method stub}@Overridepublic void afterTextChanged(Editable s){// TODO Auto-generated method stub}};

OK, 上面代码是判断出了editText中内容发生变化, 点击删除,设置editText中为空的实现.

下面是设置密码可见:

 // 监听 密码 更改密码是否可见 同样是注册这个watcherprivate TextWatcher myTextWatcher = new TextWatcher(){@Overridepublic void beforeTextChanged(CharSequence s, int start, int count,int after){// TODO Auto-generated method stubif (s.length() != 0){pet_login_password_clear = (Button) findViewById(R.id.pet_login_password_clear);pet_login_password_clear.setVisibility(View.VISIBLE);pet_login_password_clear.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View v){// TODO Auto-generated method stub//OK 这里就设置了密码可见了loginPasswordEditText.setInputType(InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);//OK这里这是密码有不可见loginPasswordEditText.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);}});}}@Overridepublic void onTextChanged(CharSequence s, int start, int before,int count){// TODO Auto-generated method stub}@Overridepublic void afterTextChanged(Editable s){// TODO Auto-generated method stub}};