java Gridview onclick images使用viewpager将imageview显示为画廊视图

Question

我的应用程序将图像显示为gridview，并单击任何图像显示库视图，允许使用viewpager左右滑动。我的代码如下

public class MemorialPhotoAlbumViewpager extends FragmentActivity {

static Activity MemorialPhotoAlbumViewpagerActivity;
int positionstate = 0;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

     Intent intent = getIntent();
      String[] myStrings = intent.getStringArrayExtra("ArrayphotoAlbum");
      int position = intent.getIntExtra("position", 0);

    setContentView(R.layout.photo_album_viewpager);

       // check the version of 安卓

    if (安卓.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = 
                new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
        }

     ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
        ImagePagerAdapter adapter = new ImagePagerAdapter(myStrings,position);
        viewPager.setAdapter(adapter);




}


private class ImagePagerAdapter extends PagerAdapter {
     private String[] ArrayphotoAlbumb;
     private int positionb;

    public ImagePagerAdapter(String[] myStrings, int position)
    {
        ArrayphotoAlbumb = myStrings;
        positionb = position;
    }

    @Override
    public int getCount() {
      return ArrayphotoAlbumb.length;
    }

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

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
      Context context = MemorialPhotoAlbumViewpager.this;

      ImageView imageView = new ImageView(context);

      String test = ArrayphotoAlbumb[position];

      Bitmap bimage=  getBitmapFromURL(test);
      imageView.setImageBitmap(bimage);



     ((ViewPager) container).addView(imageView, 0);
      return imageView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
      ((ViewPager) container).removeView((ImageView) object);
    }

  }

  public static Bitmap getBitmapFromURL(String src) {
      try {

          URL url = new URL(src);
          HttpURLConnection connection = (HttpURLConnection) url.openConnection();
          connection.setDoInput(true);
          connection.connect();
          InputStream input = connection.getInputStream();
          Bitmap myBitmap = BitmapFactory.decodeStream(input);

          return myBitmap;
      } catch (IOException e) {
          e.printStackTrace();

          return null;
      }
  }

我可以显示出来，但viewpager的位置总是从0开始。如果我点击gridview上的第二个图像并使用viewpager显示它，我该如何允许向左滑动以显示第一个图像

Answer 1

如果要为view pager启动新活动，请从gridview获取所选图像的位置，并将其传递给该活动。然后你可以在查看页面中设置所选图像

pager.setCurrentItem(currentid); // here current id is the position of selected image.