Android开发:TextSwitcher--文本切换器
Android开发:TextSwitcher--文本切换器
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);
- }
- }
- }
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