Android编程实现类似天气预报图文字幕垂直滚动效果的方法

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;
        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)
  {
    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) {
          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);
  }
}

package com.tony.autoscroll;
import com.example.testautoscroll.R;
import android.os.Bundle;
import android.app.Activity;
/**
 * link: blog.csdn.net/t12x3456
 * @author Tony
 *
 */
public class MainActivity extends Activity {
  private AutoScrollView scrollView;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    scrollView = (AutoScrollView) findViewById(R.id.auto_scrollview);
  }
  @Override
  protected void onStart() {
    // TODO Auto-generated method stub
    if(!scrollView.isScrolled()){
      scrollView.setScrolled(true);
    }
    super.onStart();
  }
  @Override
  protected void onStop() {
    // TODO Auto-generated method stub
    if(scrollView.isScrolled()){
      scrollView.setScrolled(false);
    }
    super.onStop();
  }
}