Android实战简易教程-第七十枪（自定义实用控制之-邮箱验证EditText）

Android实战简易教程-第七十枪（自定义实用控制之-邮箱验证EditText）

我们自定义一款可以验证用户输入邮箱是否符合规范的EditText.

1.布局文件：

 

2.自定义控件：

 

 

package com.example.drawableedittext;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class DrawableEditText extends RelativeLayout {

	private Context mContext;
	private EditText mEditText;
	private ImageView mImage;


	public DrawableEditText(Context context, AttributeSet attrs) {
		super(context, attrs);
		this.mContext = context;
		init();

	

		// 设置文字大小
		int textSize = attrs.getAttributeResourceValue(null, textSize, 0);
		if (textSize != 0) {
			mEditText.setTextSize(textSize);
		}

		// 设置edittext的hint提示
		int hint = attrs.getAttributeResourceValue(null, hint, 0);
		if (hint != 0) {
			mEditText.setHint(hint);
		}

		// 设置文本颜色
		int textColor = attrs.getAttributeResourceValue(null, textColor, 0);
		if (textColor != 0) {
			mEditText.setTextColor(textColor);
		}
	}

	// 初始化布局和控件
	public void init() {
		LayoutInflater inflater = LayoutInflater.from(mContext);
		View view = inflater.inflate(R.layout.drawable_edittext, this);
		mEditText = (EditText) view.findViewById(R.id.edittext);
		mImage = (ImageView) view.findViewById(R.id.image);
	}

	// 根据文本框是否为空设置不同的图片
	private void setDrawable() {
		if (checkEmail(mEditText.getText().toString())) {
			mImage.setImageResource(R.drawable.right);
			//mImage.setImageResource(nullImgRes);
		} else {
			//mImage.setImageResource(imgRes);
			mImage.setImageResource(R.drawable.close);
		}
	}

	@Override
	protected void onFinishInflate() {
		super.onFinishInflate();
		// 文本框的text改变监听
		mEditText.addTextChangedListener(new TextWatcher() {

			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {
			}

			@Override
			public void beforeTextChanged(CharSequence s, int start, int count, int after) {
			}

			@Override
			public void afterTextChanged(Editable s) {
				setDrawable();
			}
		});
	}

	/**
	 * 验证邮箱
	 * 
	 * @param email
	 * @return
	 */
	public static boolean checkEmail(String email) {
		boolean flag = false;
		try {
			String check = ^([a-z0-9A-Z]+[-|_|\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\.)+[a-zA-Z]{2,}$;
			Pattern regex = Pattern.compile(check);
			Matcher matcher = regex.matcher(email);
			flag = matcher.matches();
		} catch (Exception e) {
			flag = false;
		}
		return flag;
	}

}

3.引入控件：

 

 

运行实例：