Android TextView文字横向自动滚动(跑马灯)

TextView实现文字滚动需要以下几个要点：

  1.文字长度长于可显示范围：android:singleLine="true"

  2.设置可滚到，或显示样式：android:ellipsize="marquee"

  3.自定义滚动的ScrollingTextView

 public class ScrollingTextView extends TextView {
 
     public ScrollingTextView(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
     }
 
     public ScrollingTextView(Context context, AttributeSet attrs) {
         super(context, attrs);
     }
 
     public ScrollingTextView(Context context) {
         super(context);
     }
 
     @Override
     protected void onFocusChanged(boolean focused, int direction,
             Rect previouslyFocusedRect) {
         if (focused)
             super.onFocusChanged(focused, direction, previouslyFocusedRect);
     }
 
     @Override
     public void onWindowFocusChanged(boolean focused) {
         if (focused)
             super.onWindowFocusChanged(focused);
     }
 
     @Override
     public boolean isFocused() {
         return true;
     }
 
 }

在布局里调用自定义的TextView：

 <com.example.rolltextdemo.ScrollingTextView
         android:id="@+id/textview"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:ellipsize="marquee"
         android:marqueeRepeatLimit="marquee_forever"
         android:singleLine="true"
         android:text="@string/hello_world" />