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。