Android开发实现带清空按钮的EditText示例

本文实例讲述了android开发实现带清空按钮的edittext。分享给大家供大家参考，具体如下：

一、效果图：

二、具体代码：

import android.content.context;
import android.graphics.drawable.drawable;
import android.support.v4.content.contextcompat;
import android.support.v4.graphics.drawable.drawablecompat;
import android.support.v7.widget.appcompatedittext;
import android.text.editable;
import android.text.textwatcher;
import android.util.attributeset;
import android.view.motionevent;
import android.view.view;
import com.gdc.control.r;
public class clearableedittext extends appcompatedittext implements view.ontouchlistener, view.onfocuschangelistener, textwatcher {
  private drawable       cleartexticon;
  private onfocuschangelistener monfocuschangelistener;
  private ontouchlistener    montouchlistener;
  private boolean canclear = false;
  public clearableedittext(final context context) {
    super(context);
    init(context);
  }
  public clearableedittext(final context context, final attributeset attrs) {
    super(context, attrs);
    init(context);
  }
  public clearableedittext(final context context, final attributeset attrs,
      final int defstyleattr) {
    super(context, attrs, defstyleattr);
    init(context);
  }
  @override
  public void setonfocuschangelistener(final onfocuschangelistener
      onfocuschangelistener) {
    monfocuschangelistener = onfocuschangelistener;
  }
  @override
  public void setontouchlistener(final ontouchlistener ontouchlistener) {
    montouchlistener = ontouchlistener;
  }
  private void init(final context context) {
    final drawable drawable = contextcompat.getdrawable(context, r.drawable.ic_clear_edittext);
    final drawable wrappeddrawable = drawablecompat.wrap(drawable);
    drawablecompat.settint(wrappeddrawable, getcurrenthinttextcolor());
    cleartexticon = wrappeddrawable;
    cleartexticon.setbounds(0, 0, cleartexticon.getintrinsicwidth(),
        cleartexticon.getintrinsicheight());
    setcleariconvisible(false);
    super.setontouchlistener(this);
    super.setonfocuschangelistener(this);
    addtextchangedlistener(this);
  }
  @override
  public void onfocuschange(final view view, final boolean hasfocus) {
    if (hasfocus) {
      setcleariconvisible(gettext().length() > 0);
    } else {
      setcleariconvisible(false);
      setcanclear(true);
    }
    if (monfocuschangelistener != null) {
      monfocuschangelistener.onfocuschange(view, hasfocus);
    }
  }
  @override
  public boolean ontouch(final view view, final motionevent motionevent) {
    final int x = (int) motionevent.getx();
    if (x > getwidth() - getpaddingright() - cleartexticon.getintrinsicwidth()) {
      if (motionevent.getaction() == motionevent.action_down) {
        if (cleartexticon.isvisible()) {
          seterror(null);
          settext("");
        } else if (iscanclear()) {
          setcanclear(false);
          seterror(null);
          settext("");
        }
      }
      return true;
    } else {
      return montouchlistener != null && montouchlistener.ontouch(view,
          motionevent);
    }
  }
  @override
  public final void ontextchanged(final charsequence s, final int start, final
  int before, final int count) {
    if (isfocused()) {
      setcleariconvisible(s.length() > 0);
    }
  }
  @override
  public void beforetextchanged(charsequence s, int start, int count, int after) {
  }
  @override
  public void aftertextchanged(editable s) {
  }
  private void setcleariconvisible(final boolean visible) {
    cleartexticon.setvisible(visible, false);
    final drawable[] compounddrawables = getcompounddrawables();
    setcompounddrawables(compounddrawables[0], compounddrawables[1], visible ?
        cleartexticon :
        null, compounddrawables[3]);
  }
  public synchronized boolean iscanclear() {
    return canclear;
  }
  public synchronized void setcanclear(boolean canclear) {
    this.canclear = canclear;
  }
}

更多关于android相关内容感兴趣的读者可查看本站专题：《android控件用法总结》、《android开发入门与进阶教程》、《android视图view技巧总结》、《android编程之activity操作技巧总结》、《android数据库操作技巧总结》及《android资源操作技巧汇总》

希望本文所述对大家android程序设计有所帮助。