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我正在使用一个包含AutoCompleteTextView的TextInputLayout ，并且我希望在调用方法时它的下划线是红色的。TextInputLayout.setError()

我创建了一个名为state_errorval/attrs 的属性，一个用于覆盖方法的CustomTextInputLayout和一个用于将这个新状态添加到其状态的CustomAutoCompleteTextView 。setError()

我已经像这样定义了选择器：

<?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>

简而言之，当调用 my 时customTextInputLayout.setError()，它会调用其CustomAutoCompleteTextView，setErrorState(boolean)这会将状态更改为trueor false（取决于接收到的值）并调用refreshDrawableState()更改可绘制对象。

但是，下划线从一开始就显示为红色而不是白色，即使state_error字段为false。怎么会这样？其他州似乎没有工作。如果视图获得焦点，则线不会变为黄色，当它失去焦点时，它会变回红色，而不是白色......

如有必要，请参阅下面的代码。

activity_main.xml（只是相关的部分）

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <com.example.myapp.CustomTextInputLayout
        android:id="@+id/et_nom"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginRight="15dp"
        android:layout_weight="1">

        <com.example.myapp.CustomAutoCompleteTextView
            android:background="@drawable/my_selector"
            android:layout_width="match_parent"
            android:hint="@string/nom"
            android:maxLength="25"
            android:duplicateParentState="true"
            android:inputType="text"
            android:imeOptions="actionNext"
            android:nextFocusRight="@+id/et_primer_cognom" />

    </com.example.myapp.CustomTextInputLayout>
</LinearLayout>

值/attrs.xml

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

CustomTextInputLayout.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);
        }
    }
}

CustomAutoCompleteTextView.class

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customTextInputLayout.setError()从活动中调用时，它工作正常并且错误设置和取消设置完美，但即使CustomAutoCompleteTextView中的字段stateError为.false

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