Android AutoCompleteTextView underline的可绘制选择器中的自定义状态在任何其他状态之前应用，即使为false

我正在使用一个包含AutoCompleteTextView的TextInputLayout，我希望在调用方法

TextInputLayout.setError（）

时，它的下划线为红色

我在val/attrs中创建了一个名为

state\u error

的属性，一个用于覆盖

setError（）

方法的CustomTextInputLayout，以及一个用于将此新状态添加到其状态的CustomAutoCompleteTextView

我对选择器的定义如下：

<?xml version="1.0" encoding="utf-8"?>
<selector
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:myapp="http://schemas.android.com/apk/com.example.myapp">

    <item android:drawable="@drawable/bg_red_border" myapp:state_error="true" />
    <item android:drawable="@drawable/bg_gray_yellow_border" android:state_enabled="true" android:state_focused="true" />
    <item android:drawable="@drawable/bg_white_border" />

</selector>

value/attrs.xml

<resources>
    <declare-styleable name="custom_text_input_layout">
        <attr name="state_error" format="boolean" />
    </declare-styleable>
</resources>

CustomAutoCompleteTextView.class

public class CustomTextInputLayout extends TextInputLayout{

    public CustomTextInputLayout(Context context) {
        super(context);
    }

    public CustomTextInputLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setError(CharSequence error) {
        super.setError(error);
        if (getEditText() instanceof CustomAutoCompleteTextView) {
            ((CustomAutoCompleteTextView) getEditText()).setStateError(error != null);
        }
    }
}

public class CustomAutoCompleteTextView extends AutoCompleteTextView {

    private static final int[] STATE_ERROR = {R.attr.state_error};
    public boolean mStateError = false;


    public CustomAutoCompleteTextView(Context context) {
        super(context);
    }

    public CustomAutoCompleteTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomAutoCompleteTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    /**Overrides the method to add the state_error attribute to the drawable state set only
     if its value is true.
     */
    @Override
    protected int[] onCreateDrawableState(int extraSpace) {

        final int[] drawableState;

        if (mStateError) {
            drawableState = super.onCreateDrawableState(extraSpace + 1);
            mergeDrawableStates(drawableState, STATE_ERROR);
        } else {
            drawableState = super.onCreateDrawableState(extraSpace);
        }

        return drawableState;
    }

    /**Changes the state_error of the view to toggle the red underline drawable on/off.*/
    public void setStateError(boolean stateError) {
        if (mStateError != stateError) {
            this.mStateError = stateError;
            refreshDrawableState();
        }
    }
}

---

当我从活动中调用

customTextInputLayout.setError（）

时，它工作正常，错误设置和取消设置都很完美，但即使CustomAutoCompleteTextView中的字段

stateError

为

false
时，该行始终是红色的，我替换了
xmlns:myapp=”http://schemas.android.com/apk/com.example.myapp"
带有
xmlns:myapp=”http://schemas.android.com/apk/res-auto“
而且它似乎起作用了我已经尝试过这两种方法，但似乎都不起作用。因此，似乎你选择了一种艰难的方式来装饰背景可绘制，你可以通过创建一个自定义的
可绘制的
类来让它变得容易3倍。怎么会这样？请解释。请参阅，注意示例可绘制实现（
ErrorDrawable
）及其对
EditText-EditText
i替换的
xmlns:myapp=”的示例用法http://schemas.android.com/apk/com.example.myapp“
与
xmlns:myapp=”http://schemas.android.com/apk/res-auto"
而且它似乎起作用了，我已经尝试过这两种方法，但似乎都不起作用。因此，似乎您选择了一种艰难的方式来装饰背景可绘制，您可以通过创建一个自定义的
可绘制的
类来让它变得容易3倍。怎么会这样？请解释。请参阅注释示例可绘制实现（
ErrorDrawable
）及其在
EditText
public class CustomAutoCompleteTextView extends AutoCompleteTextView {

    private static final int[] STATE_ERROR = {R.attr.state_error};
    public boolean mStateError = false;


    public CustomAutoCompleteTextView(Context context) {
        super(context);
    }

    public CustomAutoCompleteTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomAutoCompleteTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    /**Overrides the method to add the state_error attribute to the drawable state set only
     if its value is true.
     */
    @Override
    protected int[] onCreateDrawableState(int extraSpace) {

        final int[] drawableState;

        if (mStateError) {
            drawableState = super.onCreateDrawableState(extraSpace + 1);
            mergeDrawableStates(drawableState, STATE_ERROR);
        } else {
            drawableState = super.onCreateDrawableState(extraSpace);
        }

        return drawableState;
    }

    /**Changes the state_error of the view to toggle the red underline drawable on/off.*/
    public void setStateError(boolean stateError) {
        if (mStateError != stateError) {
            this.mStateError = stateError;
            refreshDrawableState();
        }
    }
}