Android 的照片库应用如何查看图像？

Question

我正在制作一个应用程序，该应用程序应该显示全质量的可缩放图像，例如内置的 android 画廊应用程序。我尝试了一些库，但没有一个像我预期的那样完成工作。其中一些不提供完整质量的位图。

使用BitmapRegionDecoder 的其他库运行良好，但无法解码某些图像类型（CMYK、灰度）。

我不知道大多数照片库应用程序如何完美地显示所有图像？

Answer 1

使用此代码：

NAVViewPagerAdapter.java

public ViewPagerAdapter( Context aContext, int[] aImages ) {
this.myContext = aContext;
myImages = aImages;
myInflater = LayoutInflater.from( aContext );
}

@Override
public void destroyItem( ViewGroup aContainer, int aPosition, Object aObject ) {
aContainer.removeView( ( View )aObject );
}

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

/**
 * @param view
 * @param position
 * @return
 */
@Override
public Object instantiateItem( ViewGroup view, int position ) {


View aView = myInflater.inflate( R.layout.layout_inflate_fullscreen_activity, view, false );

final ImageView aImageView = ( ImageView )aView
        .findViewById( R.id.fullscreen_activity_IMG );

aImageView.setImageResource(myImages[position]);

view.addView( aView, 0 );

return aView;
}

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

 @Override
public void restoreState( Parcelable state, ClassLoader loader ) {
}

@Override
public Parcelable saveState( ) {
return null;
}
}

NAVFullScreenFragment.java

public class NAVFullScreenFragment extends Fragment {

private ViewPager myViewPager;
private int[] myImagesArray = NAVGridViewAdapter.myImages;
private FragmentActivity myActivity;

@Nullable
@Override
public View onCreateView( LayoutInflater aInflater, @Nullable ViewGroup   container, @Nullable Bundle savedInstanceState ) {
View aView = aInflater.inflate( R.layout.screen_fragment_viewpager, container, false );
viewPagerAndWidgetInitialize( aView );
return aView;
}

/**
 * ViewPager & Widget Initialization
 *
 * @param aView
 */
private void viewPagerAndWidgetInitialize(View aView) {

myActivity = getActivity();
myViewPager = ( ViewPager )aView.findViewById( R.id.screen_fragment_viewpager_pager );
CircleIndicator aIndicator = ( CircleIndicator )aView.findViewById( R.id.indicator );

Bundle aBundle = getArguments();
myViewPager.setAdapter( new NAVViewPagerAdapter(myActivity, myImagesArray));

if( aBundle != null ) {

  int aPosition = aBundle.getInt( "id" );

  // Set the images into ViewPager
  NAVViewPagerAdapter aPageradapter = new NAVViewPagerAdapter( myActivity, myImagesArray );
  myViewPager.setAdapter(aPageradapter);
  aIndicator.setViewPager(myViewPager);
  // Show images following the position
  myViewPager.setCurrentItem(aPosition);
}
}