Test_TextSwitcher 使用方法

package com.txt;

import java.util.Random; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.animation.Animation; 
import android.view.animation.AnimationUtils; 
import android.widget.Button; 
import android.widget.TextSwitcher; 
import android.widget.TextView; 
import android.widget.ViewSwitcher; 
 
public class Test_TextSwitcher extends Activity implements ViewSwitcher.ViewFactory{ 

    TextSwitcher ts; 
    TextView tv2; 
    private int poinst=0;
    public void onCreate(Bundle savedInstanceState) { 
     
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.text_switcher); 
       
        Button btn = (Button) this.findViewById(R.id.Button01); 
        ts = (TextSwitcher) this.findViewById(R.id.TextSwitcher01); 
       
        tv2 = (TextView) this.findViewById(R.id.TextView01); 
        tv2.setTextSize(36); 
        ts.setFactory(this);
       
    
        // 指定转换器的 ViewSwitcher.ViewFactory 
        // 设置淡入和淡出的动画效果 
        Animation in = AnimationUtils.loadAnimation(this,R.anim.zoomin); 
        Animation out = AnimationUtils.loadAnimation(this,R.anim.zoomout); 
        ts.setInAnimation(in); 
        ts.setOutAnimation(out);     

       
       
        btn.setOnClickListener(new Button.OnClickListener(){ 
 
            public void onClick(View v) { 
                String str = String.valueOf(new Random().nextInt()); 
               
                if(poinst==0){
                    ts.setText("sdgfdjksvbhjdfkvbhdfjklbkldfbdfjkbddddfgfbf");
                     poinst++;
                 }
                 else{
                    ts.setText("111111111111111111111111111111111111111111111111");
                    poinst=0;
                  }
                
          &nbs