Android基于TextView不获取焦点实现跑马灯效果

package com.example.tt;import android.content.Context;import android.graphics.Rect;import android.util.AttributeSet;import android.widget.TextView;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;  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  ><com.example.tt.ScrollingTextView   android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginLeft="80dip"    android:layout_marginBottom="25dip"    android:textSize="25sp"    android:singleLine="true"    android:textColor="@android:color/black"    android:ellipsize="marquee"    android:focusable="true"    android:marqueeRepeatLimit="marquee_forever"    android:focusableInTouchMode="true"    android:scrollHorizontally="true"    android:text="这才是真正的文字跑马灯效果,文字移动速度，文字移动方向，文字移动的样式，动画等等……"    android:background="#2FFFFFFF" /><Button  android:id="@+id/button1"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="Button" /></LinearLayout>

package com.example.tt;import android.os.Bundle;import android.app.Activity;import android.view.Menu;public class MainActivity extends Activity {  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);  }}