添加这个方法:

fun EditText.revertTransformation() {
    transformationMethod = when(transformationMethod) {
        is PasswordTransformationMethod -> SingleLineTransformationMethod.getInstance()
        else -> PasswordTransformationMethod.getInstance()
    }
}

调用它将在输入类型状态之间切换(您可以将Single-Line转换更改为您喜欢的)。使用的例子:

editText.revertTransformation()

添加这个方法:

fun EditText.revertTransformation() {
    transformationMethod = when(transformationMethod) {
        is PasswordTransformationMethod -> SingleLineTransformationMethod.getInstance()
        else -> PasswordTransformationMethod.getInstance()
    }
}

调用它将在输入类型状态之间切换(您可以将Single-Line转换更改为您喜欢的)。使用的例子:

editText.revertTransformation()

if (inputPassword.getTransformationMethod() == PasswordTransformationMethod.getInstance()) {
 //password is visible
                inputPassword.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
            }
else if(inputPassword.getTransformationMethod() == HideReturnsTransformationMethod.getInstance()) {
 //password is hidden
                inputPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());
            }

要显示圆点而不是密码，请设置PasswordTransformationMethod:

yourEditText.setTransformationMethod(new PasswordTransformationMethod());

当然，您可以在XML布局中的edittext元素中默认设置此选项

android:password

要重新显示可读密码，只需传递null作为转换方法:

yourEditText.setTransformationMethod(null);

只需在Xml文件中创建一个复选框

然后简单的用Java代码编写这个函数

checkbox = findViewById(R.id.checkbox);
        checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked){

                if (isChecked) {
                    password.setTransformationMethod(null);
                }
                else{
                    password.setTransformationMethod(new PasswordTransformationMethod());
                }
            }

        });

非常简单的形式:

private fun updatePasswordVisibility(editText: AppCompatEditText) {
        if (editText.transformationMethod is PasswordTransformationMethod) {
            editText.transformationMethod = null
        } else {
            editText.transformationMethod = PasswordTransformationMethod()
        }
        editText.setSelection(editText.length())
    }

希望能有所帮助。