Android登陆界面实现清除输入框内容和震动效果

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.view.View;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;

public class ClearEditText extends EditText implements View.OnFocusChangeListener,TextWatcher{

   //删除按钮的引用
  private Drawable mClearDrawable;

  //控件是否有焦点
  private boolean hasFoucs;

  public ClearEditText(Context context) {
    this(context, null);
  }

  public ClearEditText(Context context, AttributeSet attrs) {
    // 这里构造方法也很重要，不加这个很多属性不能再XML里面定义
    this(context, attrs, android.R.attr.editTextStyle);
  }

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

   private void init() {
      //获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
      mClearDrawable = getCompoundDrawables()[2];
      if (mClearDrawable == null) {
        // throw new NullPointerException("You can add drawableRight attribute in XML");
        mClearDrawable = getResources().getDrawable(R.drawable.selector_ic_delete);
      }

      //getIntrinsicWidth()取得的是Drawable在手机上的宽度，所以不同分辨率下获取到的值是不同的，关键所在处
      mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());

      //默认设置隐藏图标
      setClearIconVisible(false);
      //设置焦点改变的监听
      setOnFocusChangeListener(this);
      //设置输入框里面内容发生改变的监听
      addTextChangedListener(this);
    }

    /**
     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件
     * 当我们按下的位置 在 EditText的宽度 - 图标到控件右边的间距 - 图标的宽度 和
     * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向就没有考虑
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
      if (event.getAction() == MotionEvent.ACTION_UP) {
        if (getCompoundDrawables()[2] != null) {

          boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
              && (event.getX() < ((getWidth() - getPaddingRight())));

          if (touchable) {
            this.setText("");
          }
        }
      }

      return super.onTouchEvent(event);
    }

    /**
     * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
     */
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
      this.hasFoucs = hasFocus;
      if (hasFocus) {
        setClearIconVisible(getText().length() > 0);
      } else {
        setClearIconVisible(false);
      }
    }


    /**
     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
     * @param visible
     */
    protected void setClearIconVisible(boolean visible) {
      Drawable right = visible ? mClearDrawable : null;
      setCompoundDrawables(getCompoundDrawables()[0],
          getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }


    /**
     * 当输入框里面内容发生变化的时候回调的方法
     */
    @Override
    public void onTextChanged(CharSequence s, int start, int count,int after) {
      if(hasFoucs){
        setClearIconVisible(s.length() > 0);
      }
    }

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

    }

    @Override
    public void afterTextChanged(Editable s) {

    }


    /**
     * 设置晃动动画
     */
    public void setShakeAnimation(){
      this.setAnimation(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;
    }
}

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.app.Activity;

public class MainActivity extends Activity {

  private Button btnLogin;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    btnLogin = (Button) this.findViewById(R.id.btnLogin);
  }

  public void login(View view) {
    Toast.makeText(this, "登陆", Toast.LENGTH_LONG).show();

  }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:background="#ffffffff"
  android:orientation="vertical"
  android:padding="4.0dip" >

  <com.xuliugen.clearedittext.ClearEditText
    android:id="@+id/etxtEmail"
    style="@style/editText"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="30.0dip"
    android:drawableLeft="@drawable/icon_reg_name"
    android:drawablePadding="10.0dip"
    android:hint="使用邮箱登陆" />

  <com.xuliugen.clearedittext.ClearEditText
    android:id="@+id/etxtPwd"
    style="@style/editText"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="20.0dip"
    android:drawableLeft="@drawable/icon_reg_password"
    android:drawablePadding="10.0dip"
    android:hint="输入登陆密码"
    android:inputType="textPassword" />

  <Button
    android:id="@+id/btnLogin"
    style="@style/bigGreenButton"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="20.0dip"
    android:onClick="login"
    android:text="登陆" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

  <item android:state_enabled="false"><shape android:shape="rectangle">
      <corners android:radius="2.0dip" />

      <solid android:color="@color/green_btn_color_disable" />
    </shape></item>
  <item android:state_pressed="true"><shape android:shape="rectangle">
      <corners android:radius="2.0dip" />

      <solid android:color="@color/green_btn_color_pressed" />
    </shape></item>
  <item><shape android:shape="rectangle">
      <corners android:radius="2.0dip" />

      <solid android:color="@color/green_btn_color_normal" />
    </shape></item>

</selector>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

  <item android:drawable="@drawable/input_bar_bg_active" android:state_focused="true"/>
  <item android:drawable="@drawable/input_bar_bg_normal"/>

</selector>