ViewPager 兩邊顯示部分其他頁

主要就是設置margin，Viewpager父節點設置  android:clipChildren="false"

viewpager.setpagerMargin();

代碼

public class MainActivity extends AppCompatActivity {
    ViewPager vp;
    int colors[]=new int[]{Color.BLACK,Color.BLUE,Color.GRAY,Color.GREEN,Color.RED};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        vp= (ViewPager) findViewById(R.id.vp);
        vp.setPageMargin(30);//設置間距
        vp.setOffscreenPageLimit(3);
        vp.setAdapter(new Adapter());

    }

    class Adapter extends PagerAdapter{
        @Override
        public int getCount() {
            return colors.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view==object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ImageView imageView=new ImageView(MainActivity.this);

            imageView.setBackgroundColor(colors[position]);
            container.addView(imageView);


            return imageView;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
           // super.destroyItem(container, position, object);
            container.removeView((View) object);
        }


    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipChildren="false"
    tools:context="com.example.administrator.myviewpager.MainActivity">

   <android.support.v4.view.ViewPager
       android:id="@+id/vp"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:layout_marginBottom="20dp"
       android:layout_marginLeft="30dp"
       android:layout_marginRight="30dp"
       android:layout_marginTop="40dp"
       android:clipChildren="false"
       android:layout_centerHorizontal="true"

       >

   </android.support.v4.view.ViewPager>

</RelativeLayout>