Android使用Handler实现View弹性滑动

 
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.RelativeLayout;
public class MainActivity extends Activity {
private static final int MESSAGE_SCROLL_TO = 1;
private static final int FRAME_OUT = 30;
private static final int DELAYED_TIME = 30;
private RelativeLayout button;
private int mcount;
private Handler handler = new Handler(){
public void handleMessage(Message msg){
switch (msg.what) {
case MESSAGE_SCROLL_TO:
mcount++;
if (mcount <= FRAME_OUT) {
float fraction = mcount / (float)FRAME_OUT;
int scrollx =(int) (fraction * 100);
button.scrollTo(scrollx, 0);
handler.sendEmptyMessageDelayed(MESSAGE_SCROLL_TO, DELAYED_TIME);
}
break;
default:
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (RelativeLayout) findViewById(R.id.button1);
handler.sendEmptyMessageDelayed(MESSAGE_SCROLL_TO, DELAYED_TIME);
}
}