Android实现跑马灯效果的两种简单方式

<TextView
    android:text="班里发生什么了？不知道，先起哄再说。"
    android:ellipsize="marquee"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:marqueeRepeatLimit="marquee_forever"
    android:singleLine="true"
    android:layout_width="200dp"
    android:layout_height="wrap_content" />

<TextView
        android:id="@+id/mytext"
        android:gravity="center_vertical"
        android:text="班里发生什么了？不知道，先起哄再说。"
        android:layout_width="match_parent"
        android:layout_height="40dp" />

public class MainActivity extends Activity {


    private TextView mytext;
    private Handler handler;
    private Runnable runnable;
    private int theroll=0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        marquee();//记得调用方法

    }


    private void initView() {
        //实例化
        mytext = (TextView) findViewById(R.id.mytext);
    }
    //滚动的具体代码
    private void marquee(){
      handler=new Handler();
      runnable=new Runnable() {
          @Override
          public void run() {
          if (theroll>80){
              theroll=-80;
          }
          theroll=theroll+2;
          //通过设置下面的四个参数可以起到控制滚动方向的作用
          mytext.setPadding(theroll,0,0,0);
          handler.postDelayed(this,100);//可调整速度
          }
      };
      handler.postDelayed(runnable,0);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //在最后记得要关掉定时器
        handler.removeCallbacks(runnable);
    }
}