Use

android:drawableRight="@android:drawable/ic_input_delete"

Android的支持库中有一个SearchView类就是这样做的。(虽然不是从EditText派生的，所以必须使用一个SearchView。OnQueryTextListener代替TextWatcher)

在XML中像这样使用:

  <android.support.v7.widget.SearchView
            android:id="@+id/searchView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:iconifiedByDefault="false"
            android:queryHint="@string/SearchHint"
            app:iconifiedByDefault="false"
            app:queryHint="@string/SearchHint" />

下面是kotlin中简单的完整解决方案。

整个布局就是你的搜索栏

<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="35dp"
        android:layout_margin="10dp"
        android:background="@drawable/your_desired_drawable">

        <EditText
            android:id="@+id/search_et"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentStart="true"
            android:layout_toStartOf="@id/clear_btn"
            android:background="@null"
            android:hint="search..."
            android:imeOptions="actionSearch"
            android:inputType="text"
            android:maxLines="1"
            android:paddingStart="15dp"
            android:paddingEnd="10dp" />

        <ImageView
            android:id="@+id/clear_btn"
            android:layout_width="20dp"
            android:layout_height="match_parent"
            android:layout_alignParentEnd="true"
            android:layout_centerInParent="true"
            android:layout_marginEnd="15dp"
            android:visibility="gone"
            android:src="@drawable/ic_baseline_clear_24"/>

    </RelativeLayout>

现在这是清除按钮的功能，粘贴这段代码在onCreate方法。

search_et.addTextChangedListener(object: TextWatcher {
            override fun beforeTextChanged(s:CharSequence, start:Int, count:Int, after:Int) {
            }
            override fun onTextChanged(s:CharSequence, start:Int, before:Int, count:Int) {
            }
            override fun afterTextChanged(s: Editable) {
                if (s.isNotEmpty()){
                    clear_btn.visibility = VISIBLE
                    clear_btn.setOnClickListener {
                        search_et.text.clear()
                    }
                }else{
                    clear_btn.visibility = GONE
                }
            }
        })

明确的文本:

"文本字段带有清晰的文本尾随图标。"

如果设置了，当文本出现时将显示一个图标，按下该图标将清除输入文本。

    ...
    app:endIconMode="clear_text">
​
    ...
​
</com.google.android.material.textfield.TextInputLayout>

我把它留在这里:

material.io

例子

在你的EditText中添加drawableEnd这样的十字:

<EditText
     ...
    android:drawableEnd="@drawable/ic_close"
    android:drawablePadding="8dp"
     ... />

并使用扩展处理点击(或使用OnTouchListener直接在您的EditText):

fun EditText.onDrawableEndClick(action: () -> Unit) {
    setOnTouchListener { v, event ->
        if (event.action == MotionEvent.ACTION_UP) {
            v as EditText
            val end = if (v.resources.configuration.layoutDirection == View.LAYOUT_DIRECTION_RTL)
                v.left else v.right
            if (event.rawX >= (end - v.compoundPaddingEnd)) {
                action.invoke()
                return@setOnTouchListener true
            }
        }
        return@setOnTouchListener false
    }
}

扩展用法:

editText.onDrawableEndClick {
    // TODO clear action
    etSearch.setText("")
}

我的UI部分如下所示:

<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="50dp"
    android:layout_marginTop="9dp"
    android:padding="5dp">

    <EditText
        android:id="@+id/etSearchToolbar"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:textSize="13dp"
        android:padding="10dp"
        android:textColor="@android:color/darker_gray"
        android:textStyle="normal"
        android:hint="Search"
        android:imeOptions="actionSearch"
        android:inputType="text"
        android:background="@drawable/edittext_bg"
        android:maxLines="1" />

    <ImageView
        android:id="@+id/ivClearSearchText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginRight="6dp"
        android:src="@drawable/balloon_overlay_close"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />
</RelativeLayout>

edittext_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- res/drawable/rounded_edittext_focused.xml -->
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:padding="10dp"
    android:shape="rectangle" >

    <solid android:color="#FFFFFF" />

    <stroke
        android:width="1dp"
        android:color="#C9C9CE" />

    <corners
        android:bottomLeftRadius="15dp"
        android:bottomRightRadius="15dp"
        android:topLeftRadius="15dp"
        android:topRightRadius="15dp" />

</shape>

balloon_overlay_close.png

交叉/清除按钮隐藏/显示:

searchBox.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
        if(charSequence.length() > 0){
            clearSearch.setVisibility(View.VISIBLE);
        }else{
            clearSearch.setVisibility(View.GONE);
        }
    }

    @Override
    public void afterTextChanged(Editable editable) {}
});

处理搜索内容(即当用户从软键盘点击搜索时)

searchBox.setOnEditorActionListener(new TextView.OnEditorActionListener() {
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        if (actionId == EditorInfo.IME_ACTION_SEARCH) {
            String contents = searchBox.getText().toString().trim();
            if(contents.length() > 0){
                //do search

            }else{
                //if something to do for empty edittext
            }

            return true;
        }
        return false;
    }
});

明确/十字按钮

clearSearch.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        searchBox.setText("");
    }
});