<TextView
    android:id="@+id/tv_marquee"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/tv_marquee_text"
    android:textSize="25sp"
    android:focusable="true"
    android:ellipsize="marquee"
    android:marqueeRepeatLimit="marquee_forever"
    android:focusableInTouchMode="true"
    android:textColor="@color/colorPrimary" />

public class LampRunActivity extends AppCompatActivity {
  private TextView tv_marguee;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_lamp_run);
    intiTextView();
  }
  public void intiTextView(){
    tv_marguee= (TextView) findViewById(R.id.tv_marquee);
    tv_marguee.setSingleLine(true);//设置单行显示
    tv_marguee.setHorizontallyScrolling(true);//设置水平滚动效果
//    tv_marguee.setMarqueeRepeatLimit(-1);//设置滚动次数，-1为无限滚动，1为滚动1次