Android Edittext 清空按钮功能 自定义

本文参考网络内容，感谢网友分享！

1. 自定义ClearEditText

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

import com.cn.fujielectric.fhs.opsys.android.R;

public class ClearEditText extends EditText implements 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.delete);
		}

		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));
		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;
	}

}

2. 布局（仅贴输入框部分）

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1.5"
        android:gravity="bottom" >

        <TextView
            android:id="@+id/txv_username"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="20dp"
            android:layout_weight="1.5"
            android:text="@string/user_name"
            android:textSize="@dimen/BigLabelFontSize" />

        <com.csdnadcode.android.weight.ClearEditText
            android:id="@+id/edt_username"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginRight="10dp"
            android:layout_weight="4"
            android:background="@drawable/edit_bg_login"
            android:paddingLeft="5dp"
            android:paddingRight="5dp"
            android:singleLine="true" >
        </com.csdnadcode.android.weight.ClearEditText>
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal" >

        <View
            android:layout_width="10dp"
            android:layout_height="0.5dp"
            android:background="#FFFFFF" />

        <View
            android:layout_width="fill_parent"
            android:layout_height="0.5dp"
            android:background="#D4D4D4" />

        <View
            android:layout_width="10dp"
            android:layout_height="0.5dp"
            android:background="#FFFFFF" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1.5"
        android:gravity="bottom" >

        <TextView
            android:id="@+id/txv_password"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="20dp"
            android:layout_weight="1.5"
            android:text="@string/pass_word"
            android:textSize="@dimen/BigLabelFontSize" />

        <com.csdnadcode.android.weight.ClearEditText
            android:id="@+id/edt_password"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginRight="10dp"
            android:layout_weight="4"
            android:background="@drawable/edit_bg_login"
            android:inputType="textPassword"
            android:paddingLeft="5dp"
            android:paddingRight="5dp"
            android:singleLine="true" >
        </com.csdnadcode.android.weight.ClearEditText>
    </LinearLayout>

3.代码实现

	// 用户名输入框
	private ClearEditText edtUserCode = null;
	// 密码输入框
	private ClearEditText edtPassWord = null;

<span style="white-space:pre">	</span>edtUserCode = (ClearEditText) this.findViewById(R.id.edt_username);
	edtPassWord = (ClearEditText) this.findViewById(R.id.edt_password);

<span style="white-space:pre">	edtUserCode.setSelection(edtUserCode.getText().length());
<span style="white-space:pre">	</span>edtPassWord.setSelection(edtPassWord.getText().length());</span>

<span style="white-space:pre">	</span>

<span style="white-space:pre">	</span>//设置晃动效果
<span style="white-space:pre">	</span>edtUserCode.setShakeAnimation();
<span style="white-space:pre">	</span>edtPassWord.setShakeAnimation();