学步园

要进行切换操作，那么肯定需要ViewFactory,因为如果不设置，那么就无法完成组件的转换，而文本组件转换肯定需要操作TextView。

在main.xml中

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <TextSwitcher

        android:id="@+id/myTextSwitcher"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"/>

    <Button

        android:id="@+id/but"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="显示当前时间"/>

</LinearLayout>

在MyTextSwitcherDemo.java程序中

package com.tarena.textswitcher;

import java.text.SimpleDateFormat;

import java.util.Date;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup.LayoutParams;

import android.view.animation.AnimationUtils;

import android.widget.Button;

import android.widget.TextSwitcher;

import android.widget.TextView;

import android.widget.ViewSwitcher.ViewFactory;

public class MyTextSwitcherDemo extends Activity {

  private TextSwitcher myTextSwitcher = null;

  private Button but = null;

  @Override

  public void onCreate(Bundle savedInstanceState) {

     super.onCreate(savedInstanceState);

     super.setContentView(R.layout.main);

     this.myTextSwitcher = (TextSwitcher) super

         .findViewById(R.id.myTextSwitcher);

     this.but = (Button) super.findViewById(R.id.but);

     this.myTextSwitcher.setFactory(new ViewFactoryImpl());

    this.myTextSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,

         android.R.anim.fade_in));

    this.myTextSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,

         android.R.anim.fade_out));

     this.but.setOnClickListener(new OnClickListenerImpl());

  }

  private class OnClickListenerImpl implements OnClickListener {

     public void onClick(View v) {

       MyTextSwitcherDemo.this.myTextSwitcher.setText("当前时间为："

            + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS")

                .format(new Date()));

     }

  }

  private class ViewFactoryImpl implements ViewFactory {

     public View makeView() {

       TextView txt = new TextView(MyTextSwitcherDemo.this);

       txt.setBackgroundColor(0xFFFFFFFF);

       txt.setTextColor(0xFF000000);

       txt.setLayoutParams(new TextSwitcher.LayoutParams(

            LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

       txt.setTextSize(30);

       return txt;

     }

  }

}