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) { 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,假如没有设置使用默认的图片 mClearDrawable = getCompoundDrawables()[2]; if (mClearDrawable == null) { mClearDrawable = getResources().getDrawable( R.drawable.delete_selector); } 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); } @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 */ 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) { } }