android自定义带清空内容的TextView

android自定义带清空内容的TextView

代码：

<span style="font-size:24px;">
/**
 * 带删除按钮的EditText
 * @author Administrator
 *
 */
</span><span style="font-size:18px;">public class ClearEditText extends EditText implements OnFocusChangeListener, TextWatcher {

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

	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) {
			mClearDrawable = getResources().getDrawable(R.drawable.common_input_box_clear);
		}
		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
	 * 
	 * @param v
	 * @param hasFocus
	 *            The new focus state of v
	 */
	@Override
	public void onFocusChange(View v, boolean 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) {
		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;
	}

}</span><span style="font-size:24px;">
</span>