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

 1 public class ScrollingTextView extends TextView {
 2 
 3     public ScrollingTextView(Context context, AttributeSet attrs, int defStyle) {
 4         super(context, attrs, defStyle);
 5     }
 6 
 7     public ScrollingTextView(Context context, AttributeSet attrs) {
 8         super(context, attrs);
 9     }
10 
11     public ScrollingTextView(Context context) {
12         super(context);
13     }
14 
15     @Override
16     protected void onFocusChanged(boolean focused, int direction,
17             Rect previouslyFocusedRect) {
18         if (focused)
19             super.onFocusChanged(focused, direction, previouslyFocusedRect);
20     }
21 
22     @Override
23     public void onWindowFocusChanged(boolean focused) {
24         if (focused)
25             super.onWindowFocusChanged(focused);
26     }
27 
28     @Override
29     public boolean isFocused() {
30         return true;
31     }
32 
33 }

在布局里调用自定义的TextView：

1 <com.example.rolltextdemo.ScrollingTextView
2         android:id="@+id/textview"
3         android:layout_width="wrap_content"
4         android:layout_height="wrap_content"
5         android:ellipsize="marquee"
6         android:marqueeRepeatLimit="marquee_forever"
7         android:singleLine="true"
8         android:text="@string/hello_world" />