Android TextSwitcher Android 上下滚动TextSwitcher实例详解

时间:2021-03-24 人气:0

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Android 上下滚动TextSwitcher实例详解

1.在activity中需要代码声明

textSwitcher = (TextSwitcher)findViewById(R.id.text_switcher); 
    textSwitcher.setFactory(new ViewFactory() { 
       
      @Override 
      public View makeView() { 
        TextView tv = new  TextView(MainActivity.this); 
        tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 16.0F); 
        tv.setTextColor(Color.RED); 
        return tv; 
      } 
    }); 
     
    textSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.anim_in)); 
    textSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.anim_out));

2.两个anim动画xml

<?xml version="1.0" encoding="utf-8"?> 
<set xmlns:android="http://schemas.android.com/apk/res/android" 
   android:fillAfter="true"  
  android:shareInterpolator="false"  android:zAdjustment="top"> 
  <translate  
    android:duration="3000"  
    android:fromYDelta="100%p"  
    android:toYDelta="0" /> 
</set>

<?xml version="1.0" encoding="utf-8"?> 
<set xmlns:android="http://schemas.android.com/apk/res/android" 
  android:fillAfter="true"  
  android:shareInterpolator="false"  android:zAdjustment="top"> 
   
   <translate  
    android:duration="3000"  
    android:fromYDelta="0"  
    android:toYDelta="-100%p" />  
</set>

<style name="pop_anim"> 
    <item name="android:windowEnterAnimation">@anim/anim_in</item> 
  <item name="android:windowExitAnimation">@anim/anim_out</item> 
  </style>

3.用线程或者定时器实现循环翻动。

Thread t = new Thread(new Runnable() { 
     
    @Override 
    public void run() { 
      while (!flag) { 
        Message msg = new Message(); 
        msg.what = 1; 
        msg.obj = getItem[i]; 
        handler.sendMessage(msg); 
        if (i== 2) { 
          i = 0; 
        } 
        try { 
          t.sleep(3000); 
          i++; 
           
        } catch (InterruptedException e) { 
          // TODO Auto-generated catch block 
          e.printStackTrace(); 
        } 
      } 
       
    }

4.hanlder更新ui

private Handler handler = new Handler(){ 
    public void handleMessage(android.os.Message msg) { 
       
      textSwitcher.setText((String)msg.obj); 
       
      super.handleMessage(msg); 
    }; 
  };

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