<!-- android:focusable="true" 
   android:focusableInTouchMode="true" 
   把EditText默认的行为截断了！ -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#ECEDF1"
  android:focusable="true"
  android:focusableInTouchMode="true"
  tools:context="com.dragon.android.qqlogin.MainActivity$PlaceholderFragment" >

  <ImageView
    android:id="@+id/imageView1"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="5dp"
    android:layout_marginTop="40dp"
    android:src="@drawable/a" />   

  <EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/imageView1"
    android:ems="10"
    android:background="@drawable/bg_edittext"
    android:inputType="textPersonName"
    android:gravity="center"
    android:textColor="#6A6A6C"
    android:hint="@string/inaccount"
    android:textColorHint="#ECEDDD">
  </EditText>

  <EditText
    android:id="@+id/editText2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/editText1"
    android:ems="10"
    android:background="@drawable/bg_edittext"
    android:inputType="textPassword"
    android:gravity="center"
    android:textColor="#6A6A6C"
    android:hint="@string/inpwd"
    android:textColorHint="#ECEDDD" >
  </EditText>

  <Button
    android:id="@+id/button1"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:layout_below="@id/editText2"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp"
    android:background="@drawable/bg_button"
    android:text="@string/button"
    android:gravity="center"
    android:textColor="#F9FAFB" />

  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:padding="10dp" >

    <TextView
      android:id="@+id/textView2"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:gravity="center"
      android:text="@string/faillogin"
      android:textColor="#0EB1EF" />

    <TextView
      android:id="@+id/textView3"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:gravity="right"
      android:text="@string/regist"
      android:textColor="#0EB1EF" /> 
  </LinearLayout>

  <Button
    android:id="@+id/button2"
    android:layout_width="16dp"
    android:layout_height="16dp"
    android:layout_alignTop="@id/editText1"
    android:layout_marginTop="15dp"
    android:layout_alignParentRight="true"
    android:layout_marginRight="10dp"
    android:background="@drawable/clear"
    android:visibility="invisible" />

  <Button
    android:id="@+id/button3"
    android:layout_width="16dp"
    android:layout_height="16dp"
    android:layout_alignTop="@id/editText2"
    android:layout_marginTop="15dp"
    android:layout_alignLeft="@+id/button2"
    android:background="@drawable/clear"
    android:visibility="invisible" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
  
  <stroke android:width="1px" android:color="#00ACED" />
  
  <solid android:color="#00ACED" />
  
  <corners android:radius="10dp" />
  
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
  
  <stroke android:width="1px" android:color="#ECEDF1" />
  
  <solid android:color="#F9FAFB" />
  
  <corners android:radius="10dp" />
  
  <padding 
    android:top="10dp" 
    android:bottom="10dp"/>

</shape>

<?xml version="1.0" encoding="utf-8"?>
<resources>

  <string name="app_name">qqloginnew</string>
  <string name="action_settings">Settings</string>
  <string name="button">登录</string>
  <string name="faillogin">无法登录?</string>
  <string name="regist">新用户注册</string>
  <string name="inaccount">QQ号/手机号/邮箱</string>
  <string name="inpwd">密码</string>
  <string name="sucess">登录成功</string>

</resources>

package com.dragon.android.qqloginnew;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {
  private EditText editText1;
  private EditText editText2;
  // private Button button;
  private Button clearButton1;
  private Button clearButton2;

  // 得到strings中的属性
  // private String string2 = getResources().getString(R.string.inaccount);

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_main);

    editText1 = (EditText) findViewById(R.id.editText1);
    editText2 = (EditText) findViewById(R.id.editText2);

    // button = (Button) findViewById(R.id.button1);
    clearButton1 = (Button) findViewById(R.id.button2);
    clearButton2 = (Button) findViewById(R.id.button3);

    // 对EditText进行焦点变更监听
    editText1.setOnFocusChangeListener(new EditTextListener(clearButton1));
    editText2.setOnFocusChangeListener(new EditTextListener(clearButton2));

    // 对清空按钮进行点击监听
    clearButton1.setOnClickListener(new ClearButtonListener());
    clearButton2.setOnClickListener(new ClearButtonListener());

    // 对EditText进行编辑监听
    editText1.addTextChangedListener(new MyEditTextWatcher(editText1));
    editText2.addTextChangedListener(new MyEditTextWatcher(editText2));
  }

  /**
   * 对EditText的内容进行实时监控
   * 
   * @author Auser
   * 
   */
  class MyEditTextWatcher implements TextWatcher {
    private CharSequence temp;
    private EditText editText;

    public MyEditTextWatcher(EditText editText) {
      this.editText = editText;
    }

    @Override
    // int start开始的位置, int count被改变的旧内容数, int after改变后的内容数量
    public void beforeTextChanged(CharSequence s, int start, int count,
        int after) {
      // 这里的s表示改变之前的内容，通常start和count组合，可以在s中读取本次改变字段中被改变的内容。而after表示改变后新的内容的数量。
    }

    @Override
    // int start开始的位置, int before改变前的内容数量, int count新增量
    public void onTextChanged(CharSequence s, int start, int before,
        int count) {
      // 这里的s表示改变之后的内容，通常start和count组合，可以在s中读取本次改变字段中新的内容。而before表示被改变的内容的数量。
      temp = s;
    }

    @Override
    // 表示最终内容
    public void afterTextChanged(Editable s) {
      if (temp.length() > 0) {
        // 设置清空按钮为可见
        if (editText == editText1) {
          clearButton1.setVisibility(View.VISIBLE);
        } else if (editText == editText2) {
          clearButton2.setVisibility(View.VISIBLE);
        }
      } else {
        // 设置清空按钮不可见
        if (editText == editText1) {
          clearButton1.setVisibility(View.INVISIBLE);
        } else if (editText == editText2) {
          clearButton2.setVisibility(View.INVISIBLE);
        }
      }
    }
  }

  /**
   * 清空按钮点击事件
   * 
   * @author
   * 
   */
  class ClearButtonListener implements OnClickListener {

    @Override
    public void onClick(View view) {
      if (view == clearButton1) {
        editText1.setText("");
      } else if (view == clearButton2) {
        editText2.setText("");
      }
    }
  }

  /**
   * 焦点变更事件
   * 
   * @author Auser
   * 
   */
  class EditTextListener implements OnFocusChangeListener {
    private Button clear;

    public EditTextListener(Button clear) {
      this.clear = clear;
    }

    @Override
    public void onFocusChange(View v, boolean hasFocus) {
      EditText textView = (EditText) v;
      String hint;
      if (hasFocus) {
        // 当获取焦点时如果内容不为空则清空按钮可见
        if (!textView.getText().toString().equals("")) {
          clear.setVisibility(View.VISIBLE);
        }
        // if (textView == editText2) {
        // // 设置输入格式为不可见的密码格式
        // textView.setInputType(InputType.TYPE_CLASS_TEXT
        // | InputType.TYPE_TEXT_VARIATION_PASSWORD);
        // }
        hint = textView.getHint().toString();
        // 给TextView添加额外的数据
        textView.setTag(hint);
        textView.setHint("");
      } else {
        // 当失去焦点时清空按钮不可见
        clear.setVisibility(View.INVISIBLE);
        // if (textView == editText2) {
        // // 设置输入格式为可见的密码格式
        // textView.setInputType(InputType.TYPE_CLASS_TEXT
        // | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
        // }
        // 取出之前添加的额外数据
        hint = textView.getTag().toString();
        textView.setHint(hint);
      }
    }
  }
}