输入文本时如何更改EditText背景颜色？

问题描述

我的 EditText 有一些颜色，但是当我输入一些文本时，它应该改变。说它是灰色，我开始输入，它是黄色。此 EditText 也是重点突出的，因此当此活动开始时-我已经可以输入文本了。我如何尝试：

My EditText has some color, but when I enter some text it should change. Say it's grey, I started to enter and it's yellow. This EditText is also focused, so when this activity starts -- I already can enter the text. How I tried:

<style name="LoginEnterField">
    <item name="android:textColorHint">@color/black</item>
    <item name="android:textColor">@color/black</item>
    <item name="android:background">@drawable/selector_edittext</item>
    <item name="android:textSize">@dimen/general_text_size</item>
    <item name="android:paddingLeft">@dimen/activity_inner_horizontal_margin</item>
    <item name="android:paddingRight">@dimen/activity_inner_horizontal_margin</item>
</style>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

    android:shape="rectangle">
    <solid android:color="@color/grey"/>
    <corners android:radius="5dp" />

</shape>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

  android:shape="rectangle">
  <solid android:color="@color/yellow"/>
  <corners android:radius="5dp" />

</shape>

<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_focused="true" android:drawable="@drawable/roundbox_active_style"/>
  <item android:drawable="@drawable/roundbox_inactive_style" />
</selector>

我认为重点在此选择器中。我的EditText更改颜色，但始终为黄色。仅当输入一些文字时，如何使其变成黄色？ 我无法进行任何代码更改！这很重要。我不能仅添加或更改xml文件。

I think the point is in this selector. My EditText changes color, but it always yellow. How to make it became yellow only if I enter some text? I can't make any code changes! It's very important. I can't add or change only xml files.

编辑：仅从xml不可能做，所以要更改代码。

It's impossible to do from xml only, so make code changes.

推荐答案

使用。

附加类型对象时更改为Editable时，将在更改文本时调用其方法。

When an object of a type is attached to an Editable, its methods will be called when the text is changed.

  public void onTextChanged(CharSequence s, int start, int before, int count) {
                // Your Code // call .setBackgroundColor method here


    }

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