简单实现Android滚动公告栏

实现的效果，是一个滚动的公告栏，是这样的：

可以看到这个公告栏一方面是滚动，另外一方面是可点击。

实现的思路：

1.textview放在viewflipper中实现滑动效果（可设置左右、或者上下滚动），很明显这应该是自定义view；

2.利用textview的点击事件即可实现点击；

ok，先看看自定义view的代码：

public class marqueetextview extends linearlayout { 
 
 private context mcontext; 
 private viewflipper viewflipper; 
 private view marqueetextview; 
 private string[] textarrays; 
 private marqueetextviewclicklistener marqueetextviewclicklistener; 
 
 public marqueetextview(context context) { 
 super(context); 
 mcontext = context; 
 initbasicview(); 
 } 
 
 
 public marqueetextview(context context, attributeset attrs) { 
 super(context, attrs); 
 mcontext = context; 
 initbasicview(); 
 } 
 
 public void settextarraysandclicklistener(string[] textarrays, marqueetextviewclicklistener marqueetextviewclicklistener) {//1.设置数据源；2.设置监听回调（将textview点击事件传递到目标界面进行操作） 
 this.textarrays = textarrays; 
 this.marqueetextviewclicklistener = marqueetextviewclicklistener; 
 initmarqueetextview(textarrays, marqueetextviewclicklistener); 
 } 
 
 public void initbasicview() {//加载布局，初始化viewflipper组件及效果 
 marqueetextview = layoutinflater.from(mcontext).inflate(r.layout.marquee_textview_layout, null); 
 layoutparams layoutparams = new linearlayout.layoutparams(layoutparams.match_parent, layoutparams.wrap_content); 
 addview(marqueetextview, layoutparams); 
 viewflipper = (viewflipper) marqueetextview.findviewbyid(r.id.viewflipper); 
 viewflipper.setinanimation(animationutils.loadanimation(mcontext, r.anim.slide_in_bottom));//设置上下的动画效果（自定义动画，所以改左右也很简单） 
 viewflipper.setoutanimation(animationutils.loadanimation(mcontext, r.anim.slide_out_top)); 
 viewflipper.startflipping(); 
 } 
 
 public void initmarqueetextview(string[] textarrays, marqueetextviewclicklistener marqueetextviewclicklistener) { 
 if (textarrays.length == 0) { 
  return; 
 } 
 
 int i = 0; 
 viewflipper.removeallviews(); 
 while (i < textarrays.length) { 
  textview textview = new textview(mcontext); 
  textview.settext(textarrays[i]); 
  textview.setonclicklistener(marqueetextviewclicklistener); 
  layoutparams lp = new linearlayout.layoutparams(layoutparams.match_parent, layoutparams.wrap_content); 
  viewflipper.addview(textview, lp); 
  i++; 
 } 
 } 
 
 public void releaseresources() { 
 if (marqueetextview != null) { 
  if (viewflipper != null) { 
  viewflipper.stopflipping(); 
  viewflipper.removeallviews(); 
  viewflipper = null; 
  } 
  marqueetextview = null; 
 } 
 } 
 
} 

然后，主activity异常简单（还是封装得好）：

public class mainactivity extends appcompatactivity { 
 private marqueetextview marqueetv; 
 private string [] textarrays = new string[]{"this is content no.1","this is content no.2","this is content no.3"}; 
 
 @override 
 protected void oncreate(bundle savedinstancestate) { 
 super.oncreate(savedinstancestate); 
 setcontentview(r.layout.activity_main); 
 marqueetv = (marqueetextview) findviewbyid(r.id.marqueetv); 
 
 marqueetv.settextarraysandclicklistener(textarrays, new marqueetextviewclicklistener() { 
  @override 
  public void onclick(view view) { 
  startactivity(new intent(mainactivity.this,anotheractivity.class)); 
  } 
 }); 
 } 
 
 @override 
 protected void ondestroy() { 
 marqueetv.releaseresources(); 
 super.ondestroy(); 
 } 
} 

git地址>>https://github.com/ganshenml/marqueetextviewapp

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。