Android自定义View实现广告信息上下滚动效果

先看看效果：

实现代码：

public class ScrollBanner extends LinearLayout {

  private TextView mBannerTV1;
  private TextView mBannerTV2;
  private Handler handler;
  private boolean isShow;
  private int startY1, endY1, startY2, endY2;
  private Runnable runnable;
  private List<String> list;
  private int position = 0;
  private int offsetY = 100;

  public ScrollBanner(Context context) {
    this(context, null);
  }

  public ScrollBanner(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public ScrollBanner(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    View view = LayoutInflater.from(context).inflate(R.layout.view_scroll_banner, this);
    mBannerTV1 = (TextView) view.findViewById(R.id.tv_banner1);
    mBannerTV2 = (TextView) view.findViewById(R.id.tv_banner2);

    handler = new Handler();

    runnable = new Runnable() {
      @Override
      public void run() {
        isShow = !isShow;

        if (position == list.size())
          position = 0;

        if (isShow) {
          mBannerTV1.setText(list.get(position++));
        } else {
          mBannerTV2.setText(list.get(position++));
        }

        startY1 = isShow ? 0 : offsetY;
        endY1 = isShow ? -offsetY : 0;

        ObjectAnimator.ofFloat(mBannerTV1, "translationY", startY1, endY1).setDuration(300).start();

        startY2 = isShow ? offsetY : 0;
        endY2 = isShow ? 0 : -offsetY;
        ObjectAnimator.ofFloat(mBannerTV2, "translationY", startY2, endY2).setDuration(300).start();

        handler.postDelayed(runnable, 3000);
      }
    };

  }

  public List<String> getList() {
    return list;
  }

  public void setList(List<String> list) {
    this.list = list;
  }

  public void startScroll() {
    handler.post(runnable);
  }

  public void stopScroll() {
    handler.removeCallbacks(runnable);
  }
}

view_scroll_banner.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal"
  android:padding="10dp">

  <TextView
    android:id="@+id/tv_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:text="公告"
    android:textColor="#e76712"
    android:textSize="16sp" />

  <View
    android:id="@+id/view_divider"
    android:layout_width="1dp"
    android:layout_height="match_parent"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_toRightOf="@id/tv_title"
    android:background="#DDDDDD" />

  <TextView
    android:id="@+id/tv_banner1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_toRightOf="@+id/view_divider"
    android:ellipsize="end"
    android:singleLine="true"
    android:text="热烈欢迎领导光临" />

  <TextView
    android:id="@+id/tv_banner2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_toRightOf="@+id/view_divider"
    android:ellipsize="end"
    android:singleLine="true"
    android:text="喜庆国庆欢乐大酬宾" />
</RelativeLayout>

使用方法：

scrollBanner.setList(list);
scrollBanner.startScroll();

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