1 public class FocusedTextView extends TextView { 2     public FocusedTextView(Context context, AttributeSet attrs, int defStyle) { 3         super(context, attrs, defStyle); 4         // TODO Auto-generated constructor stub 5     } 6     public FocusedTextView(Context context, AttributeSet attrs) { 7         super(context, attrs); 8         // TODO Auto-generated constructor stub 9     }10     public FocusedTextView(Context context) {11         super(context);12         // TODO Auto-generated constructor stub13     }14     @ExportedProperty(category = "focus")15     public boolean isFocused() {  //永远拥有焦点16         // TODO Auto-generated method stub17         return true;18     }19 }

1 <com.test.ui.FocusedTextView2 android:id="@+id/tv_marquee"3 android:layout_width="match_parent"4 android:layout_height="wrap_content"5 android:singleLine="true"6 android:ellipsize="marquee"7 android:text="跑马灯效果！跑马灯效果！跑马灯效果！跑马灯效果！跑马灯效果！跑马灯效果！跑马灯效果！跑马灯效果！"8 android:textSize="30dp" />