我正在尝试使用Universal Image Loader从URL实现加载图像,并使用TouchImageView Mike Ortiz进行缩放.但是在尝试查看图像时,会显示黑屏.我已检查过网址是否正确.我是否在那里看到TextView …

我究竟做错了什么？

ImagePagerActivity.java

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_fullscreen_view);

    Bundle bundle = getIntent().getExtras();
    assert bundle != null;

    String[] imageUrls = bundle.getStringArray("urls");
    int pagerPosition = bundle.getInt("pos", 0);
    tipo = bundle.getString("tipo");
    monumento = bundle.getString("monumento");
    num = bundle.getInt("num");

    for(int i = 0; i < imageUrls.length; i++) {
        // URLS with data
        Toast.makeText(this, "URL = " + imageUrls[i], 0).show();
    }

    if (savedInstanceState != null) {
        pagerPosition = savedInstanceState.getInt(STATE_POSITION);
    }

    options = new DisplayImageOptions.Builder()
        .showImageForEmptyUri(R.drawable.imagen)
        .showImageOnFail(R.drawable.imagen)
        .resetViewBeforeLoading(true)
        .cacheOnDisc(true)
        .imageScaleType(ImageScaleType.EXACTLY)
        .bitmapConfig(Bitmap.Config.RGB_565)
        .considerExifParams(true)
        .displayer(new FadeInBitmapDisplayer(300))
        .build();

    pager = (ExtendedViewPager) findViewById(R.id.pager);
    pager.setAdapter(new ImagePagerAdapter(imageUrls));
    pager.setCurrentItem(pagerPosition);
}

@Override
public void onSaveInstanceState(Bundle outState) {
    outState.putInt(STATE_POSITION, pager.getCurrentItem());
}

private class ImagePagerAdapter extends PagerAdapter {

    private String[] images;
    private LayoutInflater inflater;

    ImagePagerAdapter(String[] images) {

        this.images = images;
        inflater = getLayoutInflater();
    }

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

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

    @Override
    public Object instantiateItem(ViewGroup view, int position) {

        final View imageLayout = inflater.inflate(R.layout.ampliar_imagen, view, false);
        assert imageLayout != null;

        imageView = (TouchImageView) imageLayout.findViewById(R.id.imagenFullScreen);

        infoImagen = (LinearLayout)imageLayout.findViewById(R.id.textoInfoImagen);
        info = (TextView) imageLayout.findViewById(R.id.textoInfoImagenDesc);

        cargarInfo(position, images);

        android.graphics.PorterDuff.Mode.MULTIPLY);

        imageView.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                LinearLayout infoImagen = (LinearLayout)imageLayout.findViewById(R.id.textoInfoImagen);

                if(infoImagen.getVisibility() == View.GONE) {
                    infoImagen.setVisibility(View.VISIBLE);
                } else {
                    infoImagen.setVisibility(View.GONE);
                }
            }
        });

        imageLoader.displayImage(images[position], imageView, options, new SimpleImageLoadingListener() {

            @Override
            public void onl oadingStarted(String imageUri, View view) {
                spinner.setVisibility(View.VISIBLE);
            }

            @Override
            public void onl oadingFailed(String imageUri, View view, FailReason failReason) {

                spinner.setVisibility(View.GONE);
            }

            @Override
            public void onl oadingComplete(String imageUri, View view, Bitmap loadedImage) {
                spinner.setVisibility(View.GONE);
            }
        });

        view.addView(imageLayout, 0);
        return imageLayout;
    }

    @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;
    }
}

private void cargarInfo(int position, String[] images) {

    if(tipo.equals("fotos")) {

        info.setText((position + 1) + " de " + images.length +
                "\n" + InfoImagenes.devolverInfoFotos(monumento, position, num, ImagePagerActivity.this));
    }

    else if(tipo.equals("planos")) {

        info.setText((position + 1) + " de " + images.length +
                "\n" + InfoImagenes.devolverInfoPlanos(position, num, ImagePagerActivity.this));
    }
}

activity_full_screen.xml

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

 <imagenes.ExtendedViewPager 
    android:id="@+id/pager"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

</LinearLayout>

ampliar_imagen.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/negro" >

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <imagenes.TouchImageView
        android:id="@+id/imagenFullScreen"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:adjustViewBounds="true" />

    <ProgressBar
        android:id="@+id/cargandoFoto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone" />
</FrameLayout>

<LinearLayout
    android:id="@+id/textoInfoImagen"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:background="@color/grisTransparente"
    android:orientation="horizontal"
    android:visibility="visible" >

    <TextView
        android:id="@+id/textoInfoImagenDesc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center_horizontal"
        android:paddingBottom="3dp"
        android:paddingTop="3dp"
        android:textColor="@color/blanco"
        android:textSize="13sp" />
</LinearLayout>

</RelativeLayout>

编辑

如果我通过ImageView更改TouchImageView,则会显示图像

解决方法:

我也遇到了这个问题,我发现它与ProgressBar的可见性有关,并且可以使用以下代码来解决它.

>在onLoadingStarted()中,添加view.setVisibility(View.GONE)
>在onLoadingComplete()中,添加view.setVisibility(View.VISIBLE)

码：

imageLoader.displayImage(imageUri.toString(), 
                     mPictureView,
                     options,
                     new SimpleImageLoadingListener()
{
@Override
public void onl oadingStarted(String imageUri, View view) 
{
    spinner.setVisibility(View.VISIBLE);
    view.setVisibility(View.GONE);
}

@Override
public void onl oadingFailed(String imageUri, View view, FailReason failReason) 
{
    spinner.setVisibility(View.GONE);
}

@Override
public void onl oadingComplete(String imageUri, View view, Bitmap loadedImage)
{
    spinner.setVisibility(View.GONE);
    view.setVisibility(View.VISIBLE);
}
});