Android中使用TextView实现文字跑马灯效果

<TextView 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:singleLine="true" 
  android:ellipsize="marquee" 
  android:focusable="true" 
  android:focusableInTouchMode="true" 
  android:text="@string/lyric" /> 

public boolean isFocused() { 
  // TODO Auto-generated method stub 
  return super.isFocused(); 
} 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:orientation="vertical" > 
  <com.example.textview.MyTextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:ellipsize="marquee" 
    android:singleLine="true" 
    android:text="@string/lyric" /> 
  <EditText 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" /> 
</LinearLayout> 

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

package com.example.textview; 
import android.content.Context; 
import android.util.AttributeSet; 
import android.view.WindowId.FocusObserver; 
import android.widget.TextView; 
public class MyTextView extends TextView{ 
  public MyTextView(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
    // TODO Auto-generated constructor stub 
  } 
  public MyTextView(Context context, AttributeSet attrs) { 
    super(context, attrs); 
    // TODO Auto-generated constructor stub 
  } 
  public MyTextView(Context context) { 
    super(context); 
    // TODO Auto-generated constructor stub 
  } 
  @Override 
  public boolean isFocused() { 
    // TODO Auto-generated method stub 
    return true; 
  } 
}