需求：

输入框一旦有值，即显示删除图标；点击切换明密文按钮，可以切换

   

布局：

 

代码

//监听密码是否输入login_pwd.addTextChangedListener(new TextWatcher() {    private CharSequence temp;    @Override    public void beforeTextChanged(CharSequence s, int start, int count, int after) {        temp = s;    }    @Override    public void onTextChanged(CharSequence s, int start, int before, int count) {    }    @Override    public void afterTextChanged(Editable s) {        if (temp.length() > 0) {
   //限制长度            login_pwd_clean.setVisibility(View.VISIBLE);        } else {            login_pwd_clean.setVisibility(View.INVISIBLE);        }    }});

login_pwd_clean.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                login_pwd.setText("");                login_pwd_clean.setVisibility(View.INVISIBLE);            }        });

//密码显示明文login_change.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {        LoginActivity.this.login_pwd.setTransformationMethod(HideReturnsTransformationMethod.getInstance());        login_change.setVisibility(View.GONE);        login_change2.setVisibility(View.VISIBLE);    }});//密码显示密文login_change2.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View v) {        LoginActivity.this.login_pwd.setTransformationMethod(PasswordTransformationMethod.getInstance());        login_change2.setVisibility(View.GONE);        login_change.setVisibility(View.VISIBLE);    }});