Android ทำ custom listview ใส่รูปขนนาด Full HD แล้วกระตุก ช่วยแนะนำหน่อยครับ

public class custom_adapter extends BaseAdapter{

        public Context mContext;
        public LayoutInflater mInflater;
        public int[] resId;

        public custom_adapter(Context context, int[] resId){
            mContext = context;
            mInflater = LayoutInflater.from(mContext);
            this.resId = resId;
        }
        @Override
        public int getCount() {
            return resId.length;
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            ViewHolder holder = null;
            if (convertView == null){
                // load layout
                convertView = mInflater.inflate(R.layout.listview_adap, null);
                holder = new ViewHolder();
                holder.txt1 = (TextView) convertView.findViewById(R.id.text1);

                convertView.setTag(holder);

            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.image = (ImageView) convertView.findViewById(R.id.imgView);
            holder.image.setImageResource(resId[position]);
            holder.txt1.setText(String.valueOf(position) + " : First");

            return convertView;
        }
    }

    public class ViewHolder{
        TextView txt1;
        ImageView image;
    }

public class MainActivity extends AppCompatActivity {

    private ListView listview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        int[] resId = {R.drawable.batman, R.drawable.ironman, R.drawable.spiderman, R.drawable.superman};
        listview = (ListView) findViewById(R.id.listview_main);
        listview.setAdapter(new custom_adapter(getApplicationContext(), resId));

    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.first_home.myapplication.MainActivity">

    <ImageView
        android:id="@+id/header"
        android:layout_width="match_parent"
        android:layout_height="300px"
        android:src="@mipmap/ic_launcher"/>
    <ListView
        android:id="@+id/listview_main"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/header"
        >

    </ListView>
</RelativeLayout>