TextSwitcher--文本切换器

 转至：

http://blog.csdn.net/shaojie519/article/details/6713187

图片的切换可以使用ImageSwitcher实现，文本的切换动画也是有一个叫TextSwitcher的类可以做到，他们都继承ViewSwitcher类。

ViewSwitcher 仅仅包含子类型TextView。TextSwitcher被用来使屏幕上的label产生动画效果。每当setText(CharSequence)被调用时，TextSwitcher使用动画方式将当前的文字内容消失并显示新的文字内容。

package com.shao.act;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher.ViewFactory;

public class TextSwitcherActivity extends Activity implements ViewFactory{
    /** Called when the activity is first created. */
    TextSwitcher switcher;
    Handler handler;
    String [] resources={
            " ","身是菩提树，",
            "心如明镜台，",
            "时时勤拂拭，",
            "勿使惹尘埃。"
    };
     private Handler mHandler = new Handler(){

            public void handleMessage(Message msg) {
                switch (msg.what) {
                case 1:
                    id = next(); //更新Id值
                    updateText();  //更新TextSwitcherd显示内容;
                    break;
                }
            };
        };
    int id= 0; //resources 数组的Id;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        init();
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new MyTask(), 1, 3000);//每3秒更新
    }
   private void init(){
       switcher = (TextSwitcher) findViewById(R.id.switcher);
       switcher.setFactory(this);
       switcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
       switcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
   }
 private int next(){

     int flag = id+1;
     if(flag>resources.length-1){
         flag=flag-resources.length;
     }
     return flag;
 }
 private void updateText(){
     switcher.setText(resources[id]);
 }
    @Override
    public View makeView() {
        // TODO Auto-generated method stub
        TextView tv =new TextView(this);
        tv.setText(resources[id]);
        return tv;
    }
     private class MyTask extends TimerTask{
            @Override
            public void run() {
                Message message = new Message();
                message.what = 1;
                mHandler.sendMessage(message);

            }
        }
}

package com.shao.act; import java.util.Timer; import java.util.TimerTask; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.view.View.OnClickListener; import android.view.animation.AnimationUtils; import android.widget.Button; import android.widget.TextSwitcher; import android.widget.TextView; import android.widget.ViewSwitcher.ViewFactory; public class TextSwitcherActivity extends Activity implements ViewFactory{ /** Called when the activity is first created. */ TextSwitcher switcher; Handler handler; String [] resources={ " ","身是菩提树，", "心如明镜台，", "时时勤拂拭，", "勿使惹尘埃。" }; private Handler mHandler = new Handler(){ public void handleMessage(Message msg) { switch (msg.what) { case 1: id = next(); //更新Id值 updateText(); //更新TextSwitcherd显示内容; break; } }; }; int id= 0; //resources 数组的Id; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); Timer timer = new Timer(); timer.scheduleAtFixedRate(new MyTask(), 1, 3000);//每3秒更新 } private void init(){ switcher = (TextSwitcher) findViewById(R.id.switcher); switcher.setFactory(this); switcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); switcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); } private int next(){ int flag = id+1; if(flag>resources.length-1){ flag=flag-resources.length; } return flag; } private void updateText(){ switcher.setText(resources[id]); } @Override public View makeView() { // TODO Auto-generated method stub TextView tv =new TextView(this); tv.setText(resources[id]); return tv; } private class MyTask extends TimerTask{ @Override public void run() { Message message = new Message(); message.what = 1; mHandler.sendMessage(message); } } }