无法在TextInputLayout中的EditText中使用drawable [英] Unable to use drawable in EditText inside TextInputLayout

问题描述

我最近将Android Design库从24.2.1升级到了25.0.0. 此后，EditText中的"drawableX"功能不起作用.

I recently upgraded Android Design library from 24.2.1 to 25.0.0. After this the "drawableX" feature in EditText doesn't work.

编辑01.11: 我了解到，如果您使用android:drawableStart而不是android:drawableLeft，则可以在xml中设置drawable起作用.但是无法以编程方式设置设置可绘制对象.我使用它来创建一个清除"按钮以清空EditText.但是此功能现在被破坏了.如果有任何变通办法或相关知识，无论是Google故意提供的还是错误的，我将不胜感激！

EDIT 01.11: I learned that setting drawable in xml works if you use android:drawableStart instead of android:drawableLeft. But setting setting drawables programatically does not work. I use this to make a "Clear"-button to empty the EditText. But this feature is broken now. I would appreciate any work-arounds or knowledge about if this is intentional from Google or a bug!

我的Clearable编辑文本的代码以前可以使用，但现在不可用:

My code for Clearable edit-text that worked before but doesn't now:

public class ClearableErrorTextInputEditText extends ErrorTextInputEditText implements View.OnFocusChangeListener, View.OnTouchListener, TextWatcher {

private Drawable resIcon;
private OnFocusChangeListener childFocusListener;

public ClearableErrorTextInputEditText(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    setup();
}

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

public ClearableErrorTextInputEditText(Context context) {
    super(context);
    setup();
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    if (event.getAction() == MotionEvent.ACTION_UP) {
        if (getCompoundDrawables()[2] != null) {
            final boolean tappedClose = event.getX() > (getWidth() - getPaddingRight() - resIcon.getIntrinsicWidth());
            if (tappedClose) {
                setText("");
                return false; // true will fail on emulator running 2.1 and physical keyboard / scroll wheel
            }
        }
    }
    return false;
}

@Override
public void setOnFocusChangeListener(OnFocusChangeListener l) {
    childFocusListener = l;
}

@Override
public void onFocusChange(View v, boolean hasFocus) {
    setClearIconVisible(hasFocus && getText().length() > 0);

    if (childFocusListener!=null){
        childFocusListener.onFocusChange(v, hasFocus);
    }
}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count){
    super.onTextChanged(s, start, before, count);
    setClearIconVisible(isFocused() && s.length() > 0);
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {} // not interesting

@Override
public void afterTextChanged(Editable s) {} //  // not interesting

private void setup() {
    if(isInEditMode()){
        return;
    }

    resIcon = getResources().getDrawable(R.drawable.ic_clear, null);
    resIcon.setBounds(0, 0, resIcon.getIntrinsicWidth(), resIcon.getIntrinsicHeight());

    setClearIconVisible(false);

    super.setOnTouchListener(this);
    super.setOnFocusChangeListener(this);
    addTextChangedListener(this);
}

private void setClearIconVisible(final boolean visible){
    final Drawable icon = visible ? resIcon : null;
    setCompoundDrawables(getCompoundDrawables()[0],
            getCompoundDrawables()[1], icon, getCompoundDrawables()[3]);
}

推荐答案

基于艾哈迈德·阿什拉夫(Ahmed Ashraf G)的回答，我找到了解决方案. 更改以下代码:

Based on the answer by Ahmed Ashraf G, I was able to find the solution. Changing the following code:

setCompoundDrawables(getCompoundDrawables()[0],
        getCompoundDrawables()[1], icon, getCompoundDrawables()[3]);

收件人:

setCompoundDrawablesRelative(getCompoundDrawablesRelative()[0],
            getCompoundDrawablesRelative()[1], icon, getCompoundDrawablesRelative()[3]);

从StackOverflow的其他位置(文档中未提及)，xxxCompoundDrawablesXxx和xxxCompundDrawablesRelativeXxx之间的区别是相对版本考虑了RTL语言，即，它们与使用drawableStart而不是drawableLeft相同.

From other places on StackOverflow (the documentation does NOT mention this) the difference between xxxCompoundDrawablesXxx and xxxCompundDrawablesRelativeXxx is that the relative versions take into account RTL-languages, ie they are the same as using drawableStart instead of drawableLeft.

因此，总而言之，Google破坏了TextInputLayout中所有不是EditText的RTL方法的方法.由于新方法是在API级别17中添加的，因此我将其视为主要错误，可能会在以后的更新中修复

So in conclusion, Google has broken all methods that are not RTL-methods for EditText inside TextInputLayout. Since the new methods are added in API level 17 I see this as major bug, that will probably be fixed in future updates

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