android ViewFlipper实现图片轮播

package xiuchang.administrator.myapplication;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.ImageView;
import android.widget.ViewFlipper;


public class MainActivity extends ActionBarActivity {

private ViewFlipper flipper ;
private float startX ;
private int [] resId ={R.drawable. pic1 ,R.drawable. pic2 ,R.drawable. pic3 ,R.drawable. pic4 };
@Override
protected void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout. activity_main );
flipper =(ViewFlipper)findViewById(R.id. flipper );
for ( int i= 0 ;i< resId . length ;i++){
flipper .addView(getImageView( resId [i]));

}
flipper .setInAnimation( this ,R.anim. left_in );
flipper .setOutAnimation( this ,R.anim. left_out );
flipper .setFlipInterval( 3000 );
flipper .startFlipping();

}

@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()){
case MotionEvent. ACTION_DOWN :{
break ;
}
case MotionEvent. ACTION_MOVE :{
startX =event.getX();
break ;
}
case MotionEvent. ACTION_UP :{
if (event.getX()- startX > 100 ){
flipper .setInAnimation( this ,R.anim. left_in );
flipper .setInAnimation( this ,R.anim. left_out );
flipper .showPrevious(); //显示前一页
}
if ( startX -event.getX()> 100 ){
flipper .setInAnimation( this ,R.anim. right_in );
flipper .setInAnimation( this ,R.anim. right_out );
flipper .showNext(); //显示前一页

}
break ;
}
}
return super .onTouchEvent(event);
}

private ImageView getImageView( int resId){
ImageView image= new ImageView( this );
image.setImageResource(resId);
return image;
}


}