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; }}

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希望本文所述对大家Android程序设计有所帮助。