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图片的切换可以使用ImageSwitcher来实现,同样文本的切换动画也可以使用Android TextSwitcher类,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.android.study;
-
- 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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