Android实现自定义带删除功能的EditText实例

1.说明

自定义带删除功能的EditText有两种方法，第一种是用组合视图的方法，即在一个view视图里面左侧放置一个EditText，右侧放置一个ImageView，但是这样增加了视图的层次，而且对输入内容的长度要做一定的处理。

第二种是重新定义EditText组件，增加相应的事件处理，即可达到很好的效果，效果图如下：

2.ClearEditText的JAVA类文件

 public class ClearEditText extends EditText implements OnFocusChangeListener,     TextWatcher {   //EditText右侧的删除按钮   private Drawable mClearDrawable;   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,假如没有设置我们就使用默认的图片,获取图片的顺序是左上右下（0,1,2,3,）     mClearDrawable = getCompoundDrawables()[2];     if (mClearDrawable == null) {       mClearDrawable = getResources().getDrawable(           R.drawable.edit_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);   }           @Override   public boolean onTouchEvent(MotionEvent event) {     if (event.getAction() == MotionEvent.ACTION_UP) {       if (getCompoundDrawables()[2] != null) {         int x = (int)event.getX();         int y = (int)event.getY();         Rect rect = getCompoundDrawables()[2].getBounds();         int height = rect.height();         int distance = (getHeight() - height)/2;         boolean isInnerWidth = x > (getWidth() - getTotalPaddingRight()) && x < (getWidth() - getPaddingRight());         boolean isInnerHeight = y > distance && y <(distance + height);         if (isInnerWidth && isInnerHeight) {           this.setText("");         }       }     }     return super.onTouchEvent(event);   }       @Override   public void onFocusChange(View v, boolean hasFocus) {     this.hasFoucs = hasFocus;     if (hasFocus) {       setClearIconVisible(getText().length() > 0);     } else {       setClearIconVisible(false);     }   }    protected void setClearIconVisible(boolean visible) {     Drawable right = visible ? mClearDrawable : null;     setCompoundDrawables(getCompoundDrawables()[0],         getCompoundDrawables()[1], right, getCompoundDrawables()[3]);   }    @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) {    }     }