Question

我想在图库加载时加载图像，而不是在用户滚动之后，想要显示加载指示符，而不是在显示新图像之后。在我的下面的代码中，它采取所有数据（包括图像）和显示。

这是我的代码：

ProductDetailsActivity.java

public class ProductsDetailActivity extends BaseActivity implements
        OnClickListener, OnItemSelectedListener {
    Gallery gallery;
    TextView prod_descri, productTitle1, productTitle2;
    ImageAdapter imageAdapter;
    ImageView leftArrow, rightArrow;
    private int selectedImagePosition = 0;
    private List<Drawable> drawables;
    String title, url, title1;
    Bundle b;
    Products product;
    ProductDetails pDetails;
    ArrayList<ProductDetails> productList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.products_details);
        init();

        setTitle(getResources().getString(R.string.title_product));
        b = getIntent().getExtras();
        product = (Products) b.getSerializable("product");
        if (b != null) {
            if (Global.isNetworkAvailable(ProductsDetailActivity.this)) {
                new ProductAsyncTask().execute(Constants.url,
                        product.product_id);
            } else {

                Intent intent = new Intent(ProductsDetailActivity.this,
                        OfflineActivity.class);
                startActivity(intent);
            }
        } else {
            Log.v("Bundle", "Bundle null");
        }

    }
    private void init() {
        productList = new ArrayList<ProductDetails>();
        gallery = (Gallery) findViewById(R.id.product_gallery);
        prod_descri = (TextView) findViewById(R.id.product_desc);
        productTitle1 = (TextView) findViewById(R.id.productTitle1);
        productTitle2 = (TextView) findViewById(R.id.productTitle2);
        leftArrow = (ImageView) findViewById(R.id.left_arrow_imageview);
        rightArrow = (ImageView) findViewById(R.id.right_arrow_imageview);
        leftArrow.setOnClickListener(this);
        rightArrow.setOnClickListener(this);
        gallery.setOnItemSelectedListener(this);

    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.left_arrow_imageview:

            if (selectedImagePosition > 0) {

                // leftArrow.setVisibility(View.VISIBLE);
                --selectedImagePosition;
            } else if (selectedImagePosition == 0) {
                leftArrow.setVisibility(View.INVISIBLE);
                rightArrow.setVisibility(View.VISIBLE);
            }
            gallery.setSelection(selectedImagePosition, true);

            break;
        case R.id.right_arrow_imageview:
            if (selectedImagePosition < drawables.size() - 1) {
                // rightArrow.setVisibility(View.VISIBLE);

                ++selectedImagePosition;
            } else if (selectedImagePosition == drawables.size() - 1) {
                rightArrow.setVisibility(View.INVISIBLE);
                leftArrow.setVisibility(View.VISIBLE);
            }

            gallery.setSelection(selectedImagePosition, true);

            break;
        default:
            break;
        }

    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position,
            long id) {

        selectedImagePosition = position;

        productTitle1.setText(product.title);
        productTitle2.setText(product.title);
        prod_descri.setText(product.long_description);

        if (selectedImagePosition > 0
                && selectedImagePosition < drawables.size() - 1) {
            leftArrow.setVisibility(View.VISIBLE);
            rightArrow.setVisibility(View.VISIBLE);
        } else if (selectedImagePosition == 0 && drawables.size() > 1) {
            leftArrow.setVisibility(View.INVISIBLE);
            rightArrow.setVisibility(View.VISIBLE);
        } else if (selectedImagePosition == drawables.size() - 1
                && drawables.size() > 1) {
            rightArrow.setVisibility(View.INVISIBLE);
            leftArrow.setVisibility(View.VISIBLE);
        } else if (drawables.size() == 1) {
            rightArrow.setVisibility(View.INVISIBLE);
            leftArrow.setVisibility(View.INVISIBLE);
        }
        // setSelectedImage(selectedImagePosition);
    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
    }

    // AsyncTask

    public class ProductAsyncTask extends
            AsyncTask<String, String, ArrayList<ProductDetails>> {

        private Context getDialogContext() {
            Context context;
            if (getParent() != null)
                context = getParent();
            else
                context = ProductsDetailActivity.this;
            return context;
        }

        String responseString = null;
        ProgressDialog progressDialog;

        public ProductAsyncTask() {
            super();
            // progressDialog = new ProgressDialog(ProductsDetailActivity.this);
            progressDialog = new ProgressDialog(getDialogContext());
            progressDialog.setCancelable(false);
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressDialog.setMessage("Loading...");
            progressDialog.show();
        }

        @Override
        protected ArrayList<ProductDetails> doInBackground(String... params) {

            responseString = readJSONSFeed(params[0], params[1]);

            if (responseString != null) {
                    return processProductDetailsJSON(responseString);
            } else {

                return null;
            }
        }

        @Override
        protected void onPostExecute(ArrayList<ProductDetails> result) {
            super.onPostExecute(result);
            try {
                if (result.size() == 0 || result == null) {

                }
                progressDialog.dismiss();

                drawables = createDrawables(result);
                imageAdapter = new ImageAdapter(ProductsDetailActivity.this,
                        drawables);
                if (drawables.size() > 0) {

                    gallery.setSelection(selectedImagePosition, true);
                }

                if (drawables.size() == 1) {
                    leftArrow.setVisibility(View.INVISIBLE);
                    rightArrow.setVisibility(View.INVISIBLE);
                }

                gallery.setAdapter(imageAdapter);

            } catch (Exception e) {

                e.printStackTrace();
            }

        }

        private List<Drawable> createDrawables(ArrayList<ProductDetails> result) {

            List<Drawable> drawablesUrl = new ArrayList<Drawable>();
            try {
                for (ProductDetails objProDetails : result) {
                    drawablesUrl.add(Global.getBitmapFromURL(
                            ProductsDetailActivity.this,
                            objProDetails.image_path));
                    // drawablesUrl.add(loadImageFromURL(objProDetails.image_path));
                }
                return drawablesUrl;

            } catch (Exception e) {

                return null;
            }

        }

        @SuppressWarnings("unused")
        private Drawable loadImageFromURL(String image_path) {
            try {
                InputStream is = (InputStream) new URL(url).getContent();
                Drawable d = Drawable.createFromStream(is, "src name");
                return d;
            } catch (Exception e) {
                return getResources().getDrawable(R.drawable.noimage);
            }
        }

        private String readJSONSFeed(String url, String productID) {

            StringBuilder stringBuilder = new StringBuilder();

            HttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url + Constants.REQ_FOR_PRODUCT_IMAGE
                    + productID + Constants.REQ_FOR_OFFER);

            httpGet.setHeader("Content-Type", "application/json");
            httpGet.setHeader("password", "password");
            httpGet.setHeader("username", "user");

            try {
                HttpResponse response = httpClient.execute(httpGet);
                StatusLine statusLine = response.getStatusLine();

                int statuscode = statusLine.getStatusCode();

                if (statuscode == 200) {

                    HttpEntity httpEntity = response.getEntity();
                    InputStream inputStream = httpEntity.getContent();

                    BufferedReader buffer = new BufferedReader(
                            new InputStreamReader(inputStream));

                    String line = null;
                    if ((line = buffer.readLine()) != null) {
                        stringBuilder.append(line);
                    }
                    // buffer.close();
                    inputStream.close();

                } else {

                }

            } catch (Exception e) {

            }
            return stringBuilder.toString();
        }

        private synchronized ArrayList<ProductDetails> processProductDetailsJSON(
                String response) {

            try {
                JSONObject json = new JSONObject(response);
                JSONArray Records = json
                        .getJSONArray(Constants.JSON_OBJECT_DATA);

                for (int i = 0; i < Records.length(); i++) {
                    JSONObject Record = Records.getJSONObject(i);

                    String tTitle = Record.getString("title");
                    String tImagePath = Record.getString("image_path");
                    String tDescription = Record.getString("description");
                    tImagePath = Constants.REQ_IMAGE_PRODUCT + tImagePath;
                    pDetails = new ProductDetails(tDescription, tTitle,
                            tImagePath);

                    if (pDetails == null) {

                    } else {
                        productList.add(pDetails);

                    }
                }


            } catch (JSONException ex) {
                System.out.println(ex);
                return null;
            }

            return productList;
        }

    }

ImageAdapter.java

public class ImageAdapter extends BaseAdapter {

    private Activity context;

    ImageView imageView;
    private List<Drawable> totalImages;
    private static ViewHolder holder;

    ArrayList<Object> imageGallery;
    int width;
    int height;
    Display display;
    int[] images = { R.drawable.ic_launcher, R.drawable.ic_launcher };

    public ImageAdapter(Context c, List<Drawable> drawables) {
        this.context = (Activity) c;
        imageGallery = new ArrayList<Object>();
        this.totalImages = drawables;
        display = context.getWindowManager().getDefaultDisplay();
        // this.imageGallery = objects;
//      width = display.getWidth();
//      height = display.getHeight();

    }

    @Override
    public int getCount() {

        return totalImages.size();
        // return 1;
    }

    @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) {

        try {
            if (convertView == null) {
                holder = new ViewHolder();
                imageView = new ImageView(this.context);
                convertView = imageView;
                holder.imageView = imageView;
                convertView.setTag(holder);
            } else {

                holder = (ViewHolder) convertView.getTag();
            }

            holder.imageView.setImageDrawable(totalImages.get(position));


            holder.imageView.setLayoutParams(new Gallery.LayoutParams(LayoutParams.MATCH_PARENT,
                    LayoutParams.MATCH_PARENT));


            holder.imageView.setScaleType(ImageView.ScaleType.FIT_XY);





            return imageView;

        } catch (Exception e) {
            e.printStackTrace();
            return imageView;
        }

    }

    static class ViewHolder {
        public ViewHolder() {

        }

        ImageView imageView;
    }


}

Here is my CustomArrayAdapter
CustomArrayAdapter.java

public class CustomArrayAdapter extends ArrayAdapter<Object> {
    Context mContext;
    ArrayList<Products> product;
    int layoutId;
    ImageLoader imageLoader;

    public CustomArrayAdapter(Context context, int textViewResourceId,
            ArrayList<Products> objects) {
        super(context, textViewResourceId);
        this.mContext = context;
        this.layoutId = textViewResourceId;

        this.product = objects;
        imageLoader = new ImageLoader(context, R.drawable.noimage);
    }

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

        ViewHolder holder;
        LayoutInflater layoutInflater = (LayoutInflater) mContext
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = layoutInflater.inflate(layoutId, parent, false);
        holder = new ViewHolder(convertView);
        holder.setValues(product.get(position));

        return convertView;
    }

    public int getCount() {
        return product.size();
    }

    public class ViewHolder {
        TextView tvProductTitle;
        TextView tvProductDescription;
        ImageView ivProductLogo, imgArrow;

        public ProgressBar progress;

        public ViewHolder(View v) {
            tvProductTitle = (TextView) v.findViewById(R.id.tvTitle);
            tvProductDescription = (TextView) v
                    .findViewById(R.id.tvDescriptions);
            ivProductLogo = (ImageView) v.findViewById(R.id.ivLogoProduct);
            imgArrow = (ImageView) v.findViewById(R.id.imgArrow);
            progress = (ProgressBar) v.findViewById(R.id.progress_bar);
        }

        public void setValues(Products products) {

            tvProductTitle.setText(products.title);
            tvProductDescription.setText(products.short_description);

            // imageLoader.displayImage(products.image, imageView, options);

            try {
                ImageLoader imageLoader = new ImageLoader(mContext);

                DisplayImageOptions options = new DisplayImageOptions.Builder()
                        .cacheOnDisc().build();
                imageLoader.DisplayImage(products.image, ivProductLogo);

                if (Global.fromProduct) {

                    imgArrow.setImageDrawable(mContext.getResources().getDrawable(R.drawable.cell_arrow_right));
                } else {
                    imgArrow.setImageDrawable(mContext.getResources().getDrawable(R.drawable.info_btn));
                }

            } catch (Exception e) {
                e.printStackTrace();
            }

            // try {

        }

        @SuppressWarnings("unused")
        private boolean cancelPotentialDownload(String url, ImageView imageView) {
            BitmapDownloaderTask bitmapDownloaderTask = getBitmapDownloaderTask(imageView);

            if (bitmapDownloaderTask != null) {
                String bitmapUrl = bitmapDownloaderTask.url;
                if ((bitmapUrl == null) || (!bitmapUrl.equals(url))) {
                    bitmapDownloaderTask.cancel(true);
                } else {
                    // The same URL is already being downloaded.
                    return false;
                }
            }
            return true;
        }

        private BitmapDownloaderTask getBitmapDownloaderTask(ImageView imageView) {
            if (imageView != null) {
                Drawable drawable = imageView.getDrawable();
                if (drawable instanceof DownloadedDrawable) {
                    DownloadedDrawable downloadedDrawable = (DownloadedDrawable) drawable;
                    return downloadedDrawable.getBitmapDownloaderTask();
                }
            }
            return null;
        }
    }

}'

Answer 1

从https://github.com/nostra13/Android-Universal-Image-Loader下载通用图片加载器。

将jar文件添加到项目的libs文件夹中

注意：通过从互联网下载图像显示以下内容。您还可以从SD卡文件夹中提供图像路径。

Universal Image Loader是Lazy Loading的改进版本。异步加载图像。如果您正在从互联网下载图像

，则可以在SD卡或手机记忆库中缓存图像

main.xml中

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">

<GridView
    android:id="@+id/PhoneImageGrid"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:columnWidth="90dp"
    android:gravity="center"
    android:horizontalSpacing="10dp"
    android:numColumns="3"
    android:stretchMode="columnWidth"
    android:verticalSpacing="10dp" />

</RelativeLayout>

row_image.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"

android:orientation="vertical" >

<ImageView
    android:id="@+id/ivv"
    android:layout_gravity="center"
    android:layout_width="300dp"
    android:layout_height="300dp"

    />
<ProgressBar 
    android:id="@+id/pb"
    android:layout_centerInParent="true"
    android:layout_gravity="center"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>

 </RelativeLayout>

AndroidCustomGalleryActivity.java

    public class AndroidCustomGalleryActivity extends Activity {

private ImageAdapter imageAdapter;
private String[] mStrings={
        "http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter.png",
        "http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png",
        "http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
        "http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
        "http://a1.twimg.com/profile_images/97470808/icon_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook.png",
        "http://a3.twimg.com/profile_images/768060227/ap4u_normal.jpg",
        "http://a1.twimg.com/profile_images/74724754/android_logo_normal.png",
        "http://a3.twimg.com/profile_images/681537837/SmallAvatarx150_normal.png",
        "http://a1.twimg.com/profile_images/63737974/2008-11-06_1637_normal.png",
        "http://a3.twimg.com/profile_images/548410609/icon_8_73.png",
        "http://a1.twimg.com/profile_images/612232882/nexusoneavatar_normal.jpg",
        "http://a1.twimg.com/profile_images/213722080/Bugdroid-phone_normal.png",
        "http://a1.twimg.com/profile_images/645523828/OT_icon_090918_android_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
        "http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
        "http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/121630227/Droid.jpg",
        "http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
        "http://a1.twimg.com/profile_images/97470808/icon_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png",
        "http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter_normal.png",
        "http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png",
        "http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
        "http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg",
        "http://a1.twimg.com/profile_images/97470808/icon.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
        "http://a3.twimg.com/profile_images/768060227/ap4u_normal.jpg",
        "http://a1.twimg.com/profile_images/74724754/android_logo.png",
        "http://a3.twimg.com/profile_images/681537837/SmallAvatarx150_normal.png",
        "http://a1.twimg.com/profile_images/63737974/2008-11-06_1637_normal.png",
        "http://a3.twimg.com/profile_images/548410609/icon_8_73_normal.png",
        "http://a1.twimg.com/profile_images/612232882/nexusoneavatar_normal.jpg",
        "http://a1.twimg.com/profile_images/213722080/Bugdroid-phone_normal.png",
        "http://a1.twimg.com/profile_images/645523828/OT_icon_090918_android.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto_normal.jpg",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png",
        "http://a1.twimg.com/profile_images/605536070/twitterProfilePhoto.jpg",
        "http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg",
        "http://a1.twimg.com/profile_images/655119538/andbook_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg",
        "http://a1.twimg.com/profile_images/957149154/twitterhalf.jpg",
        "http://a1.twimg.com/profile_images/97470808/icon_normal.png",
        "http://a3.twimg.com/profile_images/511790713/AG_normal.png",
        "http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png",
        "http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png",
        "http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg",
        "http://a1.twimg.com/profile_images/349012784/android_logo_small.jpg",
        "http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png",
        "http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png",
        "http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png"
};

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
    imageAdapter = new ImageAdapter();
    imagegrid.setAdapter(imageAdapter);


}

public class ImageAdapter extends BaseAdapter {
    private LayoutInflater mInflater;
    ImageLoader imageLoader;
       DisplayImageOptions options;
    public ImageAdapter() {

         //Get singletone instance of ImageLoader
           imageLoader = ImageLoader.getInstance();
         // Create configuration for ImageLoader (all options are optional)
            ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(AndroidCustomGalleryActivity.this)
                      // You can pass your own memory cache implementation
                     .discCacheExtraOptions(1024, 1024, CompressFormat.PNG, 100)
                   // You can pass your own disc cache implementation
                     .discCacheFileNameGenerator(new HashCodeFileNameGenerator())
                     .enableLogging()
                     .build();
            imageLoader.init(config);
         options = new DisplayImageOptions.Builder()
            .showImageForEmptyUri(R.drawable.ic_launcher)
            .resetViewBeforeLoading()
            .cacheOnDisc()
            .imageScaleType(ImageScaleType.IN_SAMPLE_INT)
            .bitmapConfig(Bitmap.Config.RGB_565)
            .displayer(new FadeInBitmapDisplayer(300))
            .build();
        mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public int getCount() {
        return mStrings.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = mInflater.inflate(
                    R.layout.rowimage, null);
            holder.imageview = (ImageView) convertView.findViewById(R.id.ivv);
            holder.pb = (ProgressBar) convertView.findViewById(R.id.pb);
            convertView.setTag(holder);
        }
        else {
            holder = (ViewHolder) convertView.getTag();
        }

        display(holder.imageview, mStrings[position].toString(), holder.pb);
       // imageLoader.displayImage(data.get(position).toString(), holder.imageview,options);
        return convertView;
    }
     public void display(ImageView img, String url, final ProgressBar spinner)
        {
            imageLoader.displayImage(url, img, options, new ImageLoadingListener() {
                @Override
                public void onLoadingStarted(String imageUri, View view) {
                 spinner.setVisibility(View.VISIBLE);
                }
                @Override
                public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
                 spinner.setVisibility(View.GONE);


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

                }

        });
        }

}
class ViewHolder {
    ImageView imageview;
    ProgressBar pb; 

}
}

Answer 2

我认为你应该使用线程看起来如下：

    logoImageView.setImageDrawable(R.id.drawable.company_logo);
    Thread.sleep(1000); // sleep for a second (1000 ms)
    nameImageView.setImageDrawable(R.id.drawable.company_name);
    Thread.sleep(1000);
    sloganImageView.setImageDrawable(R.id.drawable.company_slogan);

它只是为了了解你。

在galleryview中加载图片

2 个答案: