如何根据用户选择在ViewPager中设置CurrentPage以及如何知道哪个列表项称为活动

Question

我是新手Android programming.

我有一个项目列表,当用户点击某个项目时,它会将他们带到具有该项目详细信息的屏幕.

我希望用户能够向右和向左滑动以查看列表中的其他项目的详细信息,而不是返回列表并选择其他项目.

我读到我需要使用ViewPager才能左右滑动,所以我这样做了.
ViewPager工作正常,但是当我点击列表中的任何项目时我的问题总是到达ViewPager的第一页.

我不想要那样,我想要的是如果我点击列表中的第4项,它会将我带到第4页的视图寻呼机中,并且仍然能够向右和向左滑动以查看其他项目的详细信息.
我知道如何设置页面中viewpager的using mPager.setCurrentItem(0)
,但我不知道如何根据从列表中选择该项目(即该项目推出的活动)来设置.

这是我的代码:

包含listview的主要活动:

    public class Main extends SherlockListActivity implements OnItemClickListener {

        @Override
            protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);  

            ListView mylist = (ListView) findViewById(android.R.id.list);
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.simple_list_reda_1, R.id.list_content, getResources().getStringArray(R.array.items_list_array) );
            mylist.setAdapter(adapter);

            mylist.setOnItemClickListener(new OnItemClickListener() 
            {
                public void onItemClick(AdapterView<?> arg0,View arg1, int position, long arg3) 
                {
                    Intent n = null; 
                    switch (position){
                        case 0: 
                            n = new Intent(getApplicationContext(), ViewPagerClass.class);
                            break;
                        case 1: 
                            n = new Intent(getApplicationContext(), ViewPagerClass.class);
                            break;
                        case 2: 
                            n = new Intent(getApplicationContext(), ViewPagerClass.class);
                            break;
                        case 3: 
                            n = new Intent(getApplicationContext(), ViewPagerClass.class);
                            break;
                    }

                    if(null!=n)
                        startActivity(n);
                }
            });     
        }
    }

ViewPagerClass

    public class ViewPagerClass extends SherlockFragmentActivity{

        static final int NUM_ITEMS = 4;
        MyAdapter mAdapter;
        ViewPager mPager;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            super.setContentView(R.layout.viewpager_layout);

            mAdapter = new MyAdapter(getSupportFragmentManager());
            mPager = (ViewPager) findViewById(R.id.viewpager);
            mPager.setAdapter(mAdapter);
            //mPager.setCurrentItem(2);

                final ActionBar ab = getSupportActionBar();
                ab.setDisplayHomeAsUpEnabled(true);
                ab.setDisplayUseLogoEnabled(false);
                ab.setDisplayShowHomeEnabled(false);


    }

    public static class MyAdapter extends FragmentPagerAdapter {
        public MyAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getCount() {
            return NUM_ITEMS;
        }

        @Override
        public Fragment getItem(int position) {

            switch(position){
            case 0: return FirstPageFragment.newInstance();

            case 1: return SecondPageFragment.newInstance();

            case 2: return ThirdPageFragment.newInstance();

            case 3: return FourthPageFragment.newInstance();

            }
            return null;
        }
    }



    public static class FirstPageFragment extends Fragment {

        public static FirstPageFragment newInstance() {
            FirstPageFragment f = new FirstPageFragment();
            return f;
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View V = inflater.inflate(R.layout.fragment1, container, false);
            return V;

        }
    }

    public static class SecondPageFragment extends Fragment {

        public static SecondPageFragment newInstance() {
            SecondPageFragment f = new SecondPageFragment();
            return f;
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View V = inflater.inflate(R.layout.fragment2, container, false);
            return V;

        }
    }

    public static class ThirdPageFragment extends Fragment {

        public static ThirdPageFragment newInstance() {
            ThirdPageFragment f = new ThirdPageFragment();
            return f;
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View V = inflater.inflate(R.layout.fragment3, container, false);
            return V;

        }
    }


    public static class FourthPageFragment extends Fragment {

        public static ThirdPageFragment newInstance() {
            ThirdPageFragment f = new ThirdPageFragment();
            return f;
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View V = inflater.inflate(R.layout.fragment4, container, false);
            return V;

        }
    }

最后是viewpager_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>

<android.support.v4.view.ViewPager
android:id="@+android:id/viewpager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>

所以简而言之我想要的是:如果我点击列表中的第3项,我会转到第3项的详细信息,如果我向右滑动,我会转到第4项,如果我向左滑动,我会得到到第2项.

Answer 1

在onItemClickListener()你需要额外添加到意图,所以你可以在该活动的启动得到它.

n.putExtra("POSITION_KEY", position);

在ViewPagerClass onCreate()使用中

int position = getIntent().getIntExtra("POSITION_KEY", 0);
mPager.setCurrentItem(position);

那应该做你想做的事.