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();  }}