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本文实例讲述了Android开发实现带清空按钮的EditText。分享给大家供大家参考，具体如下：
一、效果图：
二、具体代码：
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.support.v4.graphics.drawable.DrawableCompat;
import android.support.v7.widget.AppCompatEditText;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import com.gdc.control.R;
public class ClearableEditText extends AppCompatEditText implements View.OnTouchListener, View.OnFocusChangeListener, TextWatcher {
private Drawable clearTextIcon;
private OnFocusChangeListener mOnFocusChangeListener;
private OnTouchListener mOnTouchListener;
private boolean canClear = false;
public ClearableEditText(final Context context) {
super(context);
init(context);
}
public ClearableEditText(final Context context, final AttributeSet attrs) {
super(context, attrs);
init(context);
}
public ClearableEditText(final Context context, final AttributeSet attrs,
final int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
@Override
public void setOnFocusChangeListener(final OnFocusChangeListener
onFocusChangeListener) {
mOnFocusChangeListener = onFocusChangeListener;
}
@Override
public void setOnTouchListener(final OnTouchListener onTouchListener) {
mOnTouchListener = onTouchListener;
}
private void init(final Context context) {
final Drawable drawable = ContextCompat.getDrawable(context, R.drawable.ic_clear_edittext);
final Drawable wrappedDrawable = DrawableCompat.wrap(drawable);
DrawableCompat.setTint(wrappedDrawable, getCurrentHintTextColor());
clearTextIcon = wrappedDrawable;
clearTextIcon.setBounds(0, 0, clearTextIcon.getIntrinsicWidth(),
clearTextIcon.getIntrinsicHeight());
setClearIconVisible(false);
super.setOnTouchListener(this);
super.setOnFocusChangeListener(this);
addTextChangedListener(this);
}
@Override
public void onFocusChange(final View view, final boolean hasFocus) {
if (hasFocus) {
setClearIconVisible(getText().length() > 0);
} else {
setClearIconVisible(false);
setCanClear(true);
}
if (mOnFocusChangeListener != null) {
mOnFocusChangeListener.onFocusChange(view, hasFocus);
}
}
@Override
public boolean onTouch(final View view, final MotionEvent motionEvent) {
final int x = (int) motionEvent.getX();
if (x > getWidth() - getPaddingRight() - clearTextIcon.getIntrinsicWidth()) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
if (clearTextIcon.isVisible()) {
setError(null);
setText("");
} else if (isCanClear()) {
setCanClear(false);
setError(null);
setText("");
}
}
return true;
} else {
return mOnTouchListener != null && mOnTouchListener.onTouch(view,
motionEvent);
}
}
@Override
public final void onTextChanged(final CharSequence s, final int start, final
int before, final int count) {
if (isFocused()) {
setClearIconVisible(s.length() > 0);
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
private void setClearIconVisible(final boolean visible) {
clearTextIcon.setVisible(visible, false);
final Drawable[] compoundDrawables = getCompoundDrawables();
setCompoundDrawables(compoundDrawables[0], compoundDrawables[1], visible ?
clearTextIcon :
null, compoundDrawables[3]);
}
public synchronized boolean isCanClear() {
return canClear;
}
public synchronized void setCanClear(boolean canClear) {
this.canClear = canClear;
}
}
希望本文所述对大家Android程序设计有所帮助。
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