java 带清空功能的的EditText

Posted 2021-05-08

package com.junyun.tinystore.widget;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.EditText;

import com.junyun.tinystore.R;

public class ClearableEditText extends EditText implements TextWatcher {
        private Drawable mClearDrawable, mClearDrawableLeft;
        private Drawable drawable = null;

        public ClearableEditText ( Context context, AttributeSet attrs ) {
                super ( context, attrs );
                mClearDrawable = getCompoundDrawables ( )[ 2 ];
                if ( mClearDrawable == null ) {
                        mClearDrawable = context.getResources ( ).getDrawable ( R.drawable.icon_login_username_clear );
                }
                mClearDrawable.setBounds ( 0, 0, mClearDrawable.getIntrinsicWidth ( ),
                        mClearDrawable.getIntrinsicHeight ( ) );

                setClearIconVisible ( false );
                addTextChangedListener ( this );
        }
        private void setClearIconVisible ( boolean visible ) {
                // 判断是否需要隐藏
               if ( visible ) {
                        mClearDrawableLeft = getResources ( ).getDrawable (
                                R.drawable.icon_login_username_clear );
                        drawable = mClearDrawable;

                } else {
                        mClearDrawableLeft = getResources ( ).getDrawable (
                                R.drawable.icon_login_username_clear );
                        drawable = null;
                }
                mClearDrawableLeft.setBounds ( 0, 0,
                        mClearDrawableLeft.getIntrinsicWidth ( ),
                        mClearDrawableLeft.getIntrinsicHeight ( ) );
                setCompoundDrawables ( null, getCompoundDrawables ( )[ 1 ],
                        drawable, getCompoundDrawables ( )[ 3 ] );
                // 设置editText左，上，右，下的图片
        }

        @Override
        /**
         * 获取触摸事件的方法，判断你所点击的位置是否为图片区域
         */
        public boolean onTouchEvent ( MotionEvent event ) {

                if ( event.getAction ( ) == MotionEvent.ACTION_UP ) {
                        if ( getCompoundDrawables ( )[ 2 ] != null ) {

                                boolean touchable = event.getX ( ) > ( getWidth ( ) - getTotalPaddingRight ( ) ) ;
                                if ( touchable ) {
                                        this.setText ( "" );
                                }
                        }
                }

                return super.onTouchEvent ( event );
        }

        @Override
        /**
         * 文本改变的监听器
         */
        public void onTextChanged ( CharSequence s, int start, int before, int count ) {
                if ( s != null ) {

                        setClearIconVisible ( s.length ( ) > 0 );
                }

        }

        @Override
        public void beforeTextChanged ( CharSequence s, int start, int count,
                                        int after ) {
                // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged ( Editable s ) {
                // TODO Auto-generated method stub

        }

}