本文实例介绍了安卓Android实现字幕滚动效果的方法。主要是一个现成的Java类文件实现的，该程序由Android达人Tony编写，本次是转发，还望原作者Tony不要介意。这个Android字幕滚动类的自定义功能比较多，可定义当前滚动到结尾时的停顿时间，单位：毫秒，还可设置当前的滚动速度，值越小，速度越快。
主要实现代码如下：
package com.tony.autoscroll; import android.content.Context; import android.os.Handler; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.widget.ScrollView; /** * @author Tony */ public class AutoScrollView extends ScrollView { private final Handler handler = new Handler(); private long duration = 50; private boolean isScrolled = false; private int currentIndex = 0; private long period = 1000; private int currentY = -1; private double x; private double y; private int type = -1; /** * @param context */ public AutoScrollView(Context context) { this(context, null); } /** * @param context * @param attrs */ public AutoScrollView(Context context, AttributeSet attrs) { this(context, attrs, 0); } /** * @param context * @param attrs * @param defStyle */ public AutoScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public boolean onTouchEvent(MotionEvent event) { int Action = event.getAction(); switch (Action) { case MotionEvent.ACTION_DOWN: x=event.getX(); y=event.getY(); if (type == 0) { setScrolled(false); } break; case MotionEvent.ACTION_MOVE: double moveY = event.getY() - y; double moveX = event.getX() - x; Log.d("test", "moveY = " + moveY + " moveX = " + moveX ); if ((moveY>20||moveY<-20) && (moveX < 50 || moveX > -50) && getParent() != null) { getParent().requestDisallowInterceptTouchEvent(true); } break; case MotionEvent.ACTION_UP: if (type == 0) { currentIndex = getScrollY(); setScrolled(true); } break; default: break; } return super.onTouchEvent(event); } @Override public boolean onInterceptTouchEvent(MotionEvent p_event) { Log.d("test", "onInterceptTouchEvent"); return true; } /** * 判断当前是否为滚动状态 * @return the isScrolled */ public boolean isScrolled() { return isScrolled; } /** * 开启或者关闭自动滚动功能 * @param isScrolled * true为开启，false为关闭 */ public void setScrolled(boolean isScrolled) { this.isScrolled = isScrolled; autoScroll(); } /** * 获取当前滚动到结尾时的停顿时间，单位：毫秒 * @return the period */ public long getPeriod() { return period; } /** * 设置当前滚动到结尾时的停顿时间，单位：毫秒 * @param period *the period to set */ public void setPeriod(long period) { this.period = period; } /** * 获取当前的滚动速度，单位：毫秒，值越小，速度越快。 * @return the speed */ public long getSpeed() { return duration; } /** * 设置当前的滚动速度，单位：毫秒，值越小，速度越快。 * @param speed *the duration to set */ public void setSpeed(long speed) { this.duration = speed; } public void setType(int type){ this.type = type; } private void autoScroll() { handler.postDelayed(new Runnable() { @Override public void run() { boolean flag = isScrolled; if (flag) { //Log.d("test", "currentY = " + currentY + " getScrollY() = "+ getScrollY() ); if (currentY == getScrollY()) { try { Thread.sleep(period); } catch (InterruptedException e) { e.printStackTrace(); } currentIndex = 0; scrollTo(0, 0); handler.postDelayed(this, period); } else { currentY = getScrollY(); handler.postDelayed(this, duration); currentIndex++; scrollTo(0, currentIndex * 1); } } else { //currentIndex = 0; //scrollTo(0, 0); } } }, duration); } }
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