自定义ImageButton，实现快进快退功能

      具体做法是仿照系统的RockAudioPlayer，我也是通过查看源码，然后把它简化出来，更容易于应用。通过自定义一个RepeatingImageButton，当然这个名字可以自己更改，RepeatingImageButton里的代码可以查看RockAudioPlayer的源码，我这里只给出经过简化过的java代码。

public class MainActivity extends Activity {
    /** Called when the activity is first created. edit by etgyd*/
    private RepeatingImageButton last;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        last = (RepeatingImageButton) findViewById(R.id.last);
        last.setRepeatListener(rep, 260);
        last.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                 System.out.println("last");
            }
        });
    }

    private RepeatingImageButton.RepeatListener rep = new RepeatingImageButton.RepeatListener() {

        @Override
        public void onRepeat(View v, long duration, int repeatcount) {
            // TODO Auto-generated method stub
            scanBackward(repeatcount, duration);
        }
    };

    private void scanBackward(int repcnt, long delta) {
        try {
            if (delta < 5000) {
                // seek at 10x speed for the first 5 seconds
                delta = delta * 10;
                System.out.println("long pause" + delta);
            } else {
                // seek at 40x after that
                delta = 50000 + (delta - 5000) * 40;
                System.out.println("long pause fast");
            }
        } catch (Exception ex) {
        }
    }
}