EditTextWithDel.java

package net.oschina.gitapp.widget;

import net.oschina.gitapp.R;
import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.EditText;

/**
 * @author sunday
 * 2013-12-04
 */
public class EditTextWithDel extends EditText {
	private Drawable img;
	private Context mContext;

	public EditTextWithDel(Context context) {
		super(context);
		mContext = context;
		init();
	}

	public EditTextWithDel(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		mContext = context;
		init();
	}

	public EditTextWithDel(Context context, AttributeSet attrs) {
		super(context, attrs);
		mContext = context;
		init();
	}
	
	private void init() {
		img = mContext.getResources().getDrawable(R.drawable.edittext_delete);
		addTextChangedListener(new TextWatcher() {
			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {}
			@Override
			public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
			@Override
			public void afterTextChanged(Editable s) {
				setDrawable();
			}
		});
		setDrawable();
	}
	
	//设置删除图片
	private void setDrawable() {
		if (length() >= 1 && this.isFocused()) {
			setCompoundDrawablesWithIntrinsicBounds(null, null, img, null);
		} else {
			setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
		}
	}
	
	/**
	 * 焦点改变时的处理
	 */
	@Override
	protected void onFocusChanged(boolean focused, int direction,
			Rect previouslyFocusedRect) {
		 setDrawable();
		super.onFocusChanged(focused, direction, previouslyFocusedRect);
	}
	
	 // 处理删除事件
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (img != null && event.getAction() == MotionEvent.ACTION_UP) {
            int eventX = (int) event.getRawX();
            int eventY = (int) event.getRawY();
            Rect rect = new Rect();
            getGlobalVisibleRect(rect);
            rect.left = rect.right - 50;
            if(rect.contains(eventX, eventY)) 
            	setText("");
        }
        return super.onTouchEvent(event);
    }

    @Override
    protected void finalize() throws Throwable {
        super.finalize();
    }
}