EditText之ClearEditText

1.首先看下程式碼 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 {
	/**
	 * 刪除按鈕的引用
	 */
	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) {
		// 這裡構造方法也很重要，不加這個很多屬性不能再XML裡面定義
		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() {
		// 獲取EditText的DrawableRight,假如沒有設定我們就使用預設的圖片</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);
	}

	/**
	 * 因為我們不能直接給EditText設定點選事件，所以我們用記住我們按下的位置來模擬點選事件 當我們按下的位置 在 EditText的寬度 -
	 * 圖示到控制元件右邊的間距 - 圖示的寬度 和 EditText的寬度 - 圖示到控制元件右邊的間距之間我們就算點選了圖示，豎直方向沒有考慮
	 */
	@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);
	}

	/**
	 * 當ClearEditText焦點發生變化的時候，判斷裡面字串長度設定清除圖示的顯示與隱藏
	 */
	@Override
	public void onFocusChange(View v, boolean hasFocus) {
		if(isVisible){
			if (hasFocus) {
				setClearIconVisible(getText().length() > 0);
			} else {
				setClearIconVisible(false);
			}
		}
	}

	/**
	 * 設定清除圖示的顯示與隱藏，呼叫setCompoundDrawables為EditText繪製上去
	 * 
	 * @param visible
	 */
	protected void setClearIconVisible(boolean visible) {
		Drawable right = visible ? mClearDrawable : null;
		setCompoundDrawables(getCompoundDrawables()[0],
				getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
	}

	/**
	 * 當輸入框裡面內容發生變化的時候回撥的方法
	 */

	@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) {

	}

	/**
	 * 設定晃動動畫
	 */
	public void startShakeAnimation() {
		try {
			this.startAnimation(shakeAnimation(2));
		} catch (Exception e) {
		}
	}

	/**
	 * 晃動動畫
	 * 
	 * @param counts
	 *            1秒鐘晃動多少下
	 * @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;
	}

}

其中的註釋還是很清晰的

用法和EditText是同樣的

最後的動畫的使用

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