我已经在EditText小部件中添加了文本右侧的图像，使用以下XML:
<EditText
android:id="@+id/txtsearch"
...
android:layout_gravity="center_vertical"
android:background="@layout/shape"
android:hint="Enter place,city,state"
android:drawableRight="@drawable/cross" />
但我想在单击嵌入图像时清除EditText。我该怎么做呢?
当前回答
我知道这很老了，但我最近不得不做一些类似的事情……在看到这有多难之后，我想到了一个更简单的解决方案:
创建一个包含EditText和Image的XML布局 子类framayout并扩展XML布局 为单击侦听器和任何其他您想要的行为添加代码
在我的例子中，我需要一个能够用按钮清除文本的EditText。我希望它看起来像SearchView，但由于一些原因，我不想使用这个类。下面的例子展示了我是如何完成这个任务的。尽管它与焦点变化无关，但原则是相同的，我认为发布实际的工作代码比将一个可能不完全按照我的意图工作的示例放在一起更有益:
下面是我的布局:clearle_edit_text .xml
<merge
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/edit_text_field"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<!-- NOTE: Visibility cannot be set to "gone" or the padding won't get set properly in code -->
<ImageButton
android:id="@+id/edit_text_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right|center_vertical"
android:background="@drawable/ic_cancel_x"
android:visibility="invisible"/>
</merge>
这里是膨胀布局的类:clearleedittext .java
public class ClearableEditText extends FrameLayout {
private boolean mPaddingSet = false;
/**
* Creates a new instance of this class.
* @param context The context used to create the instance
*/
public ClearableEditText (final Context context) {
this(context, null, 0);
}
/**
* Creates a new instance of this class.
* @param context The context used to create the instance
* @param attrs The attribute set used to customize this instance
*/
public ClearableEditText (final Context context, final AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* Creates a new instance of this class.
* @param context The context used to create the instance
* @param attrs The attribute set used to customize this instance
* @param defStyle The default style to be applied to this instance
*/
public ClearableEditText (final Context context, final AttributeSet attrs, final int defStyle) {
super(context, attrs, defStyle);
final LayoutInflater inflater = LayoutInflater.from(context);
inflater.inflate(R.layout.clearable_edit_text, this, true);
}
@Override
protected void onFinishInflate () {
super.onFinishInflate();
final EditText editField = (EditText) findViewById(R.id.edit_text_field);
final ImageButton clearButton = (ImageButton) findViewById(R.id.edit_text_clear);
//Set text listener so we can show/hide the close button based on whether or not it has text
editField.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged (final CharSequence charSequence, final int i, final int i2, final int i3) {
//Do nothing here
}
@Override
public void onTextChanged (final CharSequence charSequence, final int i, final int i2, final int i3) {
//Do nothing here
}
@Override
public void afterTextChanged (final Editable editable) {
clearButton.setVisibility(editable.length() > 0 ? View.VISIBLE : View.INVISIBLE);
}
});
//Set the click listener for the button to clear the text. The act of clearing the text will hide this button because of the
//text listener
clearButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick (final View view) {
editField.setText("");
}
});
}
@Override
protected void onLayout (final boolean changed, final int left, final int top, final int right, final int bottom) {
super.onLayout(changed, left, top, right, bottom);
//Set padding here in the code so the text doesn't run into the close button. This could be done in the XML layout, but then if
//the size of the image changes then we constantly need to tweak the padding when the image changes. This way it happens automatically
if (!mPaddingSet) {
final EditText editField = (EditText) findViewById(R.id.edit_text_field);
final ImageButton clearButton = (ImageButton) findViewById(R.id.edit_text_clear);
editField.setPadding(editField.getPaddingLeft(), editField.getPaddingTop(), clearButton.getWidth(), editField.getPaddingBottom());
mPaddingSet = true;
}
}
}
为了使这个答案更符合问题，应该采取以下步骤:
将可绘制资源更改为您想要的任何资源…在我的情况下，它是一个灰色的X 添加一个焦点更改监听器到编辑文本…
其他回答
之前的解决方案在Xamarin Android中都不适用。我能够得到正确的绘制点击监听器工作使用以下:
创建以下OnEditTextTouch事件监听器:
private void OnEditTextTouch(object sender, View.TouchEventArgs e)
{
var rightDrawable = _autoCompleteTextViewSearch.GetCompoundDrawables()[2];
if (rightDrawable == null || e.Event.Action != MotionEventActions.Up)
{
e.Handled = false;
return;
}
if (e.Event.GetX() >= _autoCompleteTextViewSearch.Width - _autoCompleteTextViewSearch.TotalPaddingRight)
{
// Invoke your desired action here.
e.Handled = true;
}
// Forward the event along to the sender (crucial for default behaviour)
(sender as AutoCompleteTextView)?.OnTouchEvent(e.Event);
}
订阅Touch事件:
_autoCompleteTextViewSearch.Touch += OnEditTextTouch;
实际上，您不需要扩展任何类。假设我有一个EditText editComment和一个drawableRight
editComment.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
final int DRAWABLE_LEFT = 0;
final int DRAWABLE_TOP = 1;
final int DRAWABLE_RIGHT = 2;
final int DRAWABLE_BOTTOM = 3;
if(event.getAction() == MotionEvent.ACTION_UP) {
if(event.getRawX() >= (editComment.getRight() - editComment.getCompoundDrawables()[DRAWABLE_RIGHT].getBounds().width())) {
// your action here
return true;
}
}
return false;
}
});
我们getRawX()，因为我们想要得到实际的触摸在屏幕上的位置，而不是相对于父。
要获得左侧点击
if(event.getRawX() <= (editComment.getCompoundDrawables()[DRAWABLE_LEFT].getBounds().width()))
我创建了一个简单的自定义触摸侦听器类，而不是自定义EditText
public class MyTouchListener implements View.OnTouchListener {
private EditText editText;
public MyTouchListener(EditText editText) {
this.editText = editText;
setupDrawable(this.editText);
}
private void setupDrawable(final EditText editText) {
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(s.length()>0)
editText.setCompoundDrawablesWithIntrinsicBounds(0,0, R.drawable.clearicon,0);
else
editText.setCompoundDrawablesWithIntrinsicBounds(0,0, 0,0);
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_UP) {
if(editText.getCompoundDrawables()[2]!=null){
if(event.getX() >= (editText.getRight()- editText.getLeft() - editText.getCompoundDrawables()[2].getBounds().width())) {
editText.setText("");
}
}
}
return false;
}
}
当EditText为空白时，将没有可绘制对象。绘图将显示我们开始编辑以清除EditText的时间。
你可以设置触摸监听器
mEditText.setOnTouchListener（new MyTouchListener（mEditText））;
我是这样做的
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.TextInputLayout
android:id="@+id/til_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:textColorHint="@color/colorSilver">
<android.support.design.widget.TextInputEditText
android:id="@+id/tiet_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="top|left"
android:hint="@string/rep_hint"
android:inputType="textMultiLine"
android:maxLines="3"
android:drawableEnd="@drawable/ic_attach_photo"
android:drawablePadding="5dp"
android:textColor="@color/colorPrimaryText"
android:textColorHint="@color/colorSilver"
/>
</android.support.design.widget.TextInputLayout>
<View
android:id="@+id/right_button"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true"
android:layout_marginEnd="12dp"
android:background="@color/clear" />
</RelativeLayout>
我认为如果我们使用一些技巧会容易得多:)
用图标创建一个图像按钮，并设置其背景 颜色要透明。 将图像按钮放在EditText和右边 实现按钮的onclick侦听器来执行您的 函数
Done
