EditText之ClearEditText

1.首先看下代码 吧

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Vibrator;
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;


public class ClearEditText extends EditText implements OnFocusChangeListener,
		TextWatcher {
	/**
	 * 删除按钮的引用
	 */
	private Drawable mClearDrawable;
	private static Context context;
	private boolean isVisible=true;

	public boolean isVisible() {
		return isVisible;
	}

	public void setVisible(boolean isVisible) {
		this.isVisible = isVisible;
	}

	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);
		this.context = context;
		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</span>
		mClearDrawable = getCompoundDrawables()[2];
		if (mClearDrawable == null) {
			mClearDrawable = getResources().getDrawable(
					R.drawable.emotionstore_progresscancelbtn);
		}
		mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(),
				mClearDrawable.getIntrinsicHeight());
		setClearIconVisible(false);
		setOnFocusChangeListener(this);
		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，竖直方向没有考虑
	 */
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		if (getCompoundDrawables()[2] != null) {
			if (event.getAction() == MotionEvent.ACTION_UP) {
				boolean touchable = event.getX() > (getWidth()
						- getPaddingRight() - mClearDrawable
							.getIntrinsicWidth())
						&& (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) {
		if(isVisible){
			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(isVisible){
			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 startShakeAnimation() {
		try {
			this.startAnimation(shakeAnimation(2));
		} catch (Exception e) {
		}
	}

	/**
	 * 晃动动画
	 * 
	 * @param counts
	 *            1秒钟晃动多少下
	 * @return
	 */
	public static Animation shakeAnimation(int counts) {
		Animation translateAnimation=null;
		try {
			Vibrator vibrator = (Vibrator) context
					.getSystemService(Context.VIBRATOR_SERVICE);
			vibrator.vibrate(200L);
			translateAnimation = new TranslateAnimation(0, 10, 0, 0);
			translateAnimation.setInterpolator(new CycleInterpolator(counts));
			translateAnimation.setDuration(1000);
		} catch (Exception e) {
		}
		return translateAnimation;
	}

}

其中的注释还是很清晰的

用法和EditText是同样的

最后的动画的使用

clearEditText.startAnimation(ClearEditText..shakeAnimation(2));