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Issue #150 - Pass auxiliary Object to Display Options for
ImageDownloader Refactored ImageDownloaders: made ImageDownloder as interface, created BaseImageDownloader as default implementation
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175 changes: 175 additions & 0 deletions
175
library/src/com/nostra13/universalimageloader/core/download/BaseImageDownloader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| package com.nostra13.universalimageloader.core.download; | ||
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| import java.io.BufferedInputStream; | ||
| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.FileNotFoundException; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.net.HttpURLConnection; | ||
| import java.net.URI; | ||
| import java.net.URLConnection; | ||
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| import android.content.ContentResolver; | ||
| import android.content.Context; | ||
| import android.graphics.Bitmap; | ||
| import android.graphics.Bitmap.CompressFormat; | ||
| import android.graphics.drawable.BitmapDrawable; | ||
| import android.net.Uri; | ||
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| import com.nostra13.universalimageloader.core.DisplayImageOptions; | ||
| import com.nostra13.universalimageloader.core.assist.FlushedInputStream; | ||
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| /** | ||
| * Provides retrieving of {@link InputStream} of image by URI from network or file system or app resources.<br /> | ||
| * {@link URLConnection} is used to retrieve image stream from network. | ||
| * | ||
| * @author Sergey Tarasevich (nostra13[at]gmail[dot]com) | ||
| * | ||
| * @see HttpClientImageDownloader | ||
| */ | ||
| public class BaseImageDownloader implements ImageDownloader { | ||
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| /** {@value} */ | ||
| public static final int DEFAULT_HTTP_CONNECT_TIMEOUT = 5 * 1000; // milliseconds | ||
| /** {@value} */ | ||
| public static final int DEFAULT_HTTP_READ_TIMEOUT = 20 * 1000; // milliseconds | ||
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| protected static final int BUFFER_SIZE = 8 * 1024; // 8 Kb | ||
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| protected static final String SCHEME_HTTP = "http"; | ||
| protected static final String SCHEME_HTTPS = "https"; | ||
| protected static final String SCHEME_FILE = "file"; | ||
| protected static final String SCHEME_CONTENT = "content"; | ||
| protected static final String SCHEME_ASSETS = "assets"; | ||
| protected static final String SCHEME_DRAWABLE = "drawable"; | ||
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| protected static final String SCHEME_ASSETS_PREFIX = SCHEME_ASSETS + "://"; | ||
| protected static final String SCHEME_DRAWABLE_PREFIX = SCHEME_DRAWABLE + "://"; | ||
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| protected final Context context; | ||
| protected final int connectTimeout; | ||
| protected final int readTimeout; | ||
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| public BaseImageDownloader(Context context) { | ||
| this.context = context.getApplicationContext(); | ||
| this.connectTimeout = DEFAULT_HTTP_CONNECT_TIMEOUT; | ||
| this.readTimeout = DEFAULT_HTTP_READ_TIMEOUT; | ||
| } | ||
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| public BaseImageDownloader(Context context, int connectTimeout, int readTimeout) { | ||
| this.context = context.getApplicationContext(); | ||
| this.connectTimeout = connectTimeout; | ||
| this.readTimeout = readTimeout; | ||
| } | ||
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| @Override | ||
| public InputStream getStream(URI imageUri, Object extra) throws IOException { | ||
| String scheme = imageUri.getScheme(); | ||
| if (SCHEME_HTTP.equals(scheme) || SCHEME_HTTPS.equals(scheme)) { | ||
| return getStreamFromNetwork(imageUri, extra); | ||
| } else if (SCHEME_FILE.equals(scheme)) { | ||
| return getStreamFromFile(imageUri, extra); | ||
| } else if (SCHEME_CONTENT.equals(scheme)) { | ||
| return getStreamFromContent(imageUri, extra); | ||
| } else if (SCHEME_ASSETS.equals(scheme)) { | ||
| return getStreamFromAssets(imageUri, extra); | ||
| } else if (SCHEME_DRAWABLE.equals(scheme)) { | ||
| return getStreamFromDrawable(imageUri, extra); | ||
| } else { | ||
| return getStreamFromOtherSource(imageUri, extra); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Retrieves {@link InputStream} of image by URI (image is located in the network). | ||
| * | ||
| * @param imageUri Image URI | ||
| * @param extra Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object) | ||
| * DisplayImageOptions.extraForDownloader(Object)}; can be null | ||
| * @return {@link InputStream} of image | ||
| * @throws IOException if some I/O error occurs during network request or if no InputStream could be created for | ||
| * URI. | ||
| */ | ||
| protected InputStream getStreamFromNetwork(URI imageUri, Object extra) throws IOException { | ||
| HttpURLConnection conn = (HttpURLConnection) imageUri.toURL().openConnection(); | ||
| conn.setConnectTimeout(connectTimeout); | ||
| conn.setReadTimeout(readTimeout); | ||
| return new FlushedInputStream(conn.getInputStream(), BUFFER_SIZE); | ||
| } | ||
|
|
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| /** | ||
| * Retrieves {@link InputStream} of image by URI (image is located on the local file system or SD card). | ||
| * | ||
| * @param imageUri Image URI | ||
| * @param extra Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object) | ||
| * DisplayImageOptions.extraForDownloader(Object)}; can be null | ||
| * @return {@link InputStream} of image | ||
| * @throws IOException if some I/O error occurs reading from file system | ||
| */ | ||
| protected InputStream getStreamFromFile(URI imageUri, Object extra) throws IOException { | ||
| return new BufferedInputStream(imageUri.toURL().openStream(), BUFFER_SIZE); | ||
| } | ||
|
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| /** | ||
| * Retrieves {@link InputStream} of image by URI (image is accessed using {@link ContentResolver}). | ||
| * | ||
| * @param imageUri Image URI | ||
| * @param extra Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object) | ||
| * DisplayImageOptions.extraForDownloader(Object)}; can be null | ||
| * @return {@link InputStream} of image | ||
| * @throws FileNotFoundException if the provided URI could not be opened | ||
| */ | ||
| protected InputStream getStreamFromContent(URI imageUri, Object extra) throws FileNotFoundException { | ||
| ContentResolver res = context.getContentResolver(); | ||
| Uri uri = Uri.parse(imageUri.toString()); | ||
| return res.openInputStream(uri); | ||
| } | ||
|
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| /** | ||
| * Retrieves {@link InputStream} of image by URI (image is located in assets of application). | ||
| * | ||
| * @param imageUri Image URI | ||
| * @param extra Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object) | ||
| * DisplayImageOptions.extraForDownloader(Object)}; can be null | ||
| * @return {@link InputStream} of image | ||
| * @throws IOException if some I/O error occurs file reading | ||
| */ | ||
| protected InputStream getStreamFromAssets(URI imageUri, Object extra) throws IOException { | ||
| String filePath = imageUri.toString().substring(SCHEME_ASSETS_PREFIX.length()); // Remove "assets://" prefix from image URI | ||
| return context.getAssets().open(filePath); | ||
| } | ||
|
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| /** | ||
| * Retrieves {@link InputStream} of image by URI (image is located in drawable resources of application). | ||
| * | ||
| * @param imageUri Image URI | ||
| * @param extra Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object) | ||
| * DisplayImageOptions.extraForDownloader(Object)}; can be null | ||
| * @return {@link InputStream} of image | ||
| */ | ||
| protected InputStream getStreamFromDrawable(URI imageUri, Object extra) { | ||
| String drawableIdString = imageUri.toString().substring(SCHEME_DRAWABLE_PREFIX.length()); // Remove "drawable://" prefix from image URI | ||
| int drawableId = Integer.parseInt(drawableIdString); | ||
| BitmapDrawable drawable = (BitmapDrawable) context.getResources().getDrawable(drawableId); | ||
| Bitmap bitmap = drawable.getBitmap(); | ||
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| ByteArrayOutputStream os = new ByteArrayOutputStream(); | ||
| bitmap.compress(CompressFormat.PNG, 0, os); | ||
| return new ByteArrayInputStream(os.toByteArray()); | ||
| } | ||
|
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| /** | ||
| * Retrieves {@link InputStream} of image by URI from other source. Should be overriden by successors to implement | ||
| * image downloading from special sources. | ||
| * | ||
| * @param imageUri Image URI | ||
| * @param extra Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object) | ||
| * DisplayImageOptions.extraForDownloader(Object)}; can be null | ||
| * @return {@link InputStream} of image | ||
| * @throws IOException if some I/O error occurs | ||
| */ | ||
| protected InputStream getStreamFromOtherSource(URI imageUri, Object extra) throws IOException { | ||
| return null; | ||
| } | ||
| } |
76 changes: 0 additions & 76 deletions
76
library/src/com/nostra13/universalimageloader/core/download/ExtendedImageDownloader.java
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