带有删除按钮，自动补全邮箱后缀的自定义EditText

package com.example.autocompletetextview;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
/**
* 带删除按钮的且可以自动补全邮箱后缀的自定义EditText
*/
public class EmailAutoCompleteTextView extends AutoCompleteTextView implements TextWatcher {
private static final String TAG = “EmailAutoCompleteTextView”;
public boolean hasFoucs;
private Drawable mClearDrawable;
private String[] emailSufixs = new String[] { “@163.com”,”@126.com”,”@sina.com”,”@qq.com”,”@sogou.com”,”@sohu.com”,
“@yahoo.com.cn”,”@56.com”};

public EmailAutoCompleteTextView(Context context) {
    super(context);
    init(context);
}

public EmailAutoCompleteTextView(Context context, AttributeSet attrs) {
    this(context, attrs,android.R.attr.editTextStyle);
}

public EmailAutoCompleteTextView(Context context, AttributeSet attrs,
        int defStyle) {
    super(context, attrs, defStyle);
    init(context);
}

public void setAdapterString(String[] es) {
    if(es != null && es.length > 0)
        this.emailSufixs = es;
}

private void init(final Context context) {
    // 获取EditText的DrawableRight，如果没有，则使用默认图片。
    mClearDrawable = getCompoundDrawables()[2];
    if (mClearDrawable == null) {
        mClearDrawable = getResources().getDrawable(
                R.drawable.delete_selector);
    }
    mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(),
            mClearDrawable.getIntrinsicHeight());
    setClearIcoVisible(false);
    addTextChangedListener(this);

    // adapter中使用默认的emailSufixs中的数据，可以通过setAdapterString来更改
    this.setAdapter(new EmailAutoCompleteAdapter(context,
            R.layout.auto_complete_item, emailSufixs));

    // 使得在输入1个字符之后便开启自动完成
    this.setThreshold(1);

    // 为输入框设置焦点改变监听，如果输入框有焦点，我们判断输入框的值是否为空，为空就隐藏清除图标，否则就显示
    this.setOnFocusChangeListener(new OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            EmailAutoCompleteTextView.this.hasFoucs = hasFocus;
            if (hasFocus) {
                setClearIcoVisible(getText().length() > 0);
                String text = EmailAutoCompleteTextView.this.getText()
                        .toString();
                // 当该文本域重新获得焦点后，重启自动完成
                if (!"".equals(text))
                    performFiltering(text, 0);
            } else {
                setClearIcoVisible(false);
                // 当文本域丢失焦点后，检查输入email地址的格式
                EmailAutoCompleteTextView ev = (EmailAutoCompleteTextView) v;
                String text = ev.getText().toString();
                // 正则判断邮箱格式是否正确
                if (text != null
                        && text.matches("^[a-zA-Z0-9_]+@[a-zA-Z0-9]+\\.[a-zA-Z0-9]+$")) {
                    Toast to = new Toast(context);
                    ImageView i = new ImageView(context);
                    i.setBackgroundResource(R.drawable.ico_refund_success);
                    to.setView(i);
                    to.show();
                } else {
                    Toast toast = Toast.makeText(context, "邮件地址格式不正确",
                            Toast.LENGTH_SHORT);
                    toast.setGravity(Gravity.TOP, 0, 50);
                    toast.show();
                }
            }
        }
    });
}

@Override
protected void replaceText(CharSequence text) {
    //当我们在下拉框中选择一项时，android会默认使用AutoCompleteTextView中Adapter里的文本来填充文本域
    //因为这里Adapter中只是存了常用email的后缀
    //因此要重新replace逻辑，将用户输入的部分与后缀合并
    Log.i(TAG + " replaceText", text.toString());
    String t = this.getText().toString();
    int index = t.indexOf("@");
    if(index != -1)
        t = t.substring(0, index);
    super.replaceText(t + text);
}

@Override
protected void performFiltering(CharSequence text, int keyCode) {
    //该方法会在用户输入文本之后调用，将已输入的文本与adapter中的数据对比，若它匹配
    //adapter中数据的前半部分，那么adapter中的这条数据将会在下拉框中出现
    Log.i(TAG + " performFiltering", text.toString() + "   " + keyCode);
    String t = text.toString();

    //因为用户输入邮箱时，都是以字母，数字开始，而我们的adapter中只会提供以类似于"@163.com"
    //的邮箱后缀，因此在调用super.performFiltering时，传入的一定是以"@"开头的字符串
    int index = t.indexOf("@");
    if(index == -1) {
        if(t.matches("^[a-zA-Z0-9_]+$")) {
            super.performFiltering("@", keyCode);
        }
        else
            this.dismissDropDown();//当用户中途输入非法字符时，关闭下拉提示框
    } else {
        super.performFiltering(t.substring(index), keyCode);
    }
}


private class EmailAutoCompleteAdapter extends ArrayAdapter {

    public EmailAutoCompleteAdapter(Context context, int textViewResourceId, String[] email_s) {
        super(context, textViewResourceId, email_s);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Log.i(TAG, "in GetView");
        View v = convertView;
        if (v == null)
            v = LayoutInflater.from(getContext()).inflate(
                    R.layout.auto_complete_item, null);
        TextView tv = (TextView) v.findViewById(R.id.tv);

        String t = EmailAutoCompleteTextView.this.getText().toString();
        int index = t.indexOf("@");
        if(index != -1)
            t = t.substring(0, index);
        //将用户输入的文本与adapter中的email后缀拼接后，在下拉框中显示
        tv.setText(t + getItem(position));
        Log.i(TAG, tv.getText().toString());
        return v;
    }
}

/**
 * 设置图标的显示和隐藏，调用setCompoundDrawables为EditText绘制上去。
 * 
 * @param visible
 */
private void setClearIcoVisible(boolean visible) {
    Drawable rightDrawable = visible ? mClearDrawable : null;
    setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1], rightDrawable, getCompoundDrawables()[3]);
}

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

}

@Override
public void afterTextChanged(Editable s) {

}

/**
 * 当手指抬起的位置在clean的图标的区域 我们将此视为进行清除操作 getWidth():得到控件的宽度
 * event.getX():抬起时的坐标(改坐标是相对于控件本身而言的)
 * getTotalPaddingRight():clean的图标左边缘至控件右边缘的距离
 * getPaddingRight():clean的图标右边缘至控件右边缘的距离 于是: getWidth() -
 * getTotalPaddingRight()表示: 控件左边到clean的图标左边缘的区域 getWidth() -
 * getPaddingRight()表示: 控件左边到clean的图标右边缘的区域 所以这两者之间的区域刚好是clean的图标的区域
 */
@Override
public boolean onTouchEvent(MotionEvent event) {

    if (getCompoundDrawables()[2] != null) {
        boolean touchable = (event.getX() > (getWidth() - getTotalPaddingRight())) && (event.getX() < (getWidth() - getPaddingRight()));
        if (touchable) {
            this.setText("");
        }
    }
    return super.onTouchEvent(event);
}

/**
 * 文本框中内容发生变化时判断内容长度是否为空
 * 
 */
@Override
public void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {

    if (hasFoucs) {
        setClearIcoVisible(length() > 0);
    }
    // TODO 自动生成的方法存根
    super.onTextChanged(text, start, lengthBefore, lengthAfter);
}

/**
 * 设置晃动动画
 */
public void setShakeAnimation() {

    this.startAnimation(shakeAnimation(5));
}

/**
 * 晃动动画
 * 
 * @param counts
 *            1秒钟晃动多少下
 * @return
 */
public static Animation shakeAnimation(int counts) {

    Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
    translateAnimation.setInterpolator(new CycleInterpolator(counts));
    translateAnimation.setDuration(1000);
    return translateAnimation;
}

}
源码下载地址: http://download.csdn.net/detail/qq_20489601/9509923