仿知乎登陆邮箱自动补全，邮箱补全

项目要求：

登陆界面输入邮箱，自动匹配常用邮箱并自动补全后缀。

比如邮箱为10376129@qq.com，当我输入10376129@q时，输入框自动补全后面的q.com且颜色为灰浅色，输入框失去焦点时，补全q.com颜色变为黑色，和前面103796129@q的颜色一致。

解决：

1.通过查看知乎的布局，发现没有用自定义控件，仅仅用了普通的EditText。

2.查看EditTex(继承TextView)t的API,最终想到了用下面这个方法

void android.widget.TextView.setCompoundDrawables(Drawable left,Drawable

top, Drawable right,

Drawable bottom)

通过绘制EditText右边的Drawable来显示需要自动补全的字符串

3.演示

4.关键代码

package com.lt.autoemailactivity;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Rect;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.text.Editable;

import android.text.TextWatcher;

import android.view.View;

import android.view.View.OnFocusChangeListener;

import android.widget.EditText;

public class AutoCompleteEditTextActivity extends Activity implements

TextWatcher {

/**

* 邮箱EditText

*/

private EditText mEmailEditText;

/**

* 常用的邮箱

*/

private HashMap mAutoData = new HashMap();

/**

* 邮箱editText的高度

*/

private int mHeight;

/**

* 邮箱editText的宽度

*/

private int mWidth;

/**

* 输入框中字符的baseLine

*/

private int baseLine;

/**

* 画笔

*/

private Paint mPaint;

private Bitmap mBitmap;

/**

* 画布

*/

private Canvas canvas;

private Drawable drawable;

/**

* 后缀字符串

*/

private String mAddedText = "";

/**

* 记录是否为空

*/

private boolean mFlag;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_auto_complete_edittext);

initEmail();

mEmailEditText = (EditText) findViewById(R.id.email);

mEmailEditText.addTextChangedListener(this);

mEmailEditText.setOnFocusChangeListener(new OnFocusChangeListener() {

@Override

public void onFocusChange(View v, boolean hasFocus) {

if (!hasFocus) {

mEmailEditText.append(mAddedText);

}

}

});

}

@Override

public void beforeTextChanged(CharSequence s, int start, int count,

int after) {

}

@Override

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

}

@Override

public void afterTextChanged(Editable s) {

String text = s.toString();

mFlag = true;

Iterator> iterator = mAutoData.entrySet()

.iterator();

// 遍历常用邮箱

while (iterator.hasNext()) {

Map.Entry entry = iterator.next();

if (text.endsWith(entry.getKey())) {

drawAddedText(entry.getValue());

mAddedText = entry.getValue();

mFlag = false;

break;

}

}

// 如果没有匹配，就画一个空

if (mFlag) {

drawAddedText("");

mAddedText = "";

}

}

/**

* 画出后缀字符串

*

* @param addedText

*/

private void drawAddedText(String addedText) {

// 如果字符串为空，画空

if (addedText.equals("")) {

mEmailEditText.setCompoundDrawables(null, null, null, null);

return;

}

// 只需要初始化一次

if (mBitmap == null) {

mHeight = mEmailEditText.getHeight();

mWidth = mEmailEditText.getWidth();

// 初始化画笔

mPaint = new Paint();

mPaint.setColor(Color.GRAY);

mPaint.setAntiAlias(true);// 去除锯齿

mPaint.setFilterBitmap(true);// 对位图进行滤波处理

mPaint.setTextSize(mEmailEditText.getTextSize());

}

// 计算baseLine

Rect rect = new Rect();

int baseLineLocation = mEmailEditText.getLineBounds(0, rect);

baseLine = baseLineLocation - rect.top;

// 添加的字符窜的长度

int addedTextWidth = (int) (mPaint.measureText(addedText) + 1);

// 创建bitmap

mBitmap = Bitmap.createBitmap(addedTextWidth, mHeight,

Bitmap.Config.ARGB_8888);

canvas = new Canvas(mBitmap);

// 绘制后缀字符串

canvas.drawText(addedText, 0, baseLine, mPaint);

// bitmap转化为Drawable

drawable = new BitmapDrawable(mBitmap);

String text = mEmailEditText.getText().toString();

// 计算后缀字符串在输入框中的位置

int addedTextLeft = (int) (mPaint.measureText(text) - mWidth + addedTextWidth);

int addedTextRight = addedTextLeft + addedTextWidth;

int addedTextTop = 0;

int addedTextBottom = addedTextTop + mHeight;

// 设置后缀字符串位置

drawable.setBounds(addedTextLeft, addedTextTop, addedTextRight,

addedTextBottom);

// 显示后缀字符串

mEmailEditText.setCompoundDrawables(null, null, drawable, null);

}

/**

* 初始化常用的邮箱

*/

private void initEmail() {

mAutoData.put("@q", "q.com");

mAutoData.put("@qq", ".com");

mAutoData.put("@qq.", "com");

mAutoData.put("@qq.c", "om");

mAutoData.put("@qq.co", "m");

mAutoData.put("@1", "63.com");

mAutoData.put("@16", "3.com");

mAutoData.put("@163", ".com");

mAutoData.put("@163.", "com");

mAutoData.put("@163.c", "om");

mAutoData.put("@163.co", "m");

mAutoData.put("@s", "ina.cn");

mAutoData.put("@si", "na.cn");

mAutoData.put("@sin", "a.cn");

mAutoData.put("@sina", ".cn");

mAutoData.put("@sina.", "cn");

mAutoData.put("@sina.c", "n");

mAutoData.put("@s", "ina.com");

mAutoData.put("@si", "na.com");

mAutoData.put("@sin", "a.com");

mAutoData.put("@sina", ".com");

mAutoData.put("@sina.", "com");

mAutoData.put("@sina.c", "om");

mAutoData.put("@sina.co", "m");

mAutoData.put("@1", "26.com");

mAutoData.put("@12", "6.com");

mAutoData.put("@126", ".com");

mAutoData.put("@126.", "com");

mAutoData.put("@126.c", "om");

mAutoData.put("@126.co", "m");

}

}

5.源码下载(有注释)

http://download.csdn.net/detail/a15501628162/8412245

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