Android UI-开源框架ImageLoader的完美例子

android:layout_gravity=“left|center_vertical”

android:layout_marginLeft=“20dip”

android:textSize=“22sp” />

GridView异步加载图片显示

/2013.8.19_Universal_Image_Loader_Demo/res/layout/ac_image_grid.xml

android:id=“@+id/gridview”

android:layout_width=“fill_parent”

android:layout_height=“fill_parent”

android:gravity=“center”

android:horizontalSpacing=“4dip”

android:numColumns=“3”

android:stretchMode=“columnWidth”

android:verticalSpacing=“4dip”

android:padding=“4dip” />

/2013.8.19_Universal_Image_Loader_Demo/res/layout/item_grid_image.xml

android:id=“@+id/image”

android:layout_width=“fill_parent”

android:layout_height=“120dip”

android:adjustViewBounds=“true”

android:contentDescription=“@string/descr_image”

android:scaleType=“centerCrop” />

ViewPager异步加载图片显示

**/2013.8.19_Universal_Image_Loader_Demo/res/layout/ac_image_pager.xml

**

android:id=“@+id/pager”

android:layout_width=“fill_parent”

android:layout_height=“fill_parent” />

/2013.8.19_Universal_Image_Loader_Demo/res/layout/ item_pager_image.xml

android:layout_width=“fill_parent”

android:layout_height=“fill_parent”

android:padding=“1dip” >

android:id=“@+id/image”

android:layout_width=“wrap_content”

android:layout_height=“wrap_content”

android:layout_gravity=“center”

android:adjustViewBounds=“true”

android:contentDescription=“@string/descr_image” />

android:id=“@+id/loading”

android:layout_width=“wrap_content”

android:layout_height=“wrap_content”

android:layout_gravity=“center”

android:visibility=“gone” />

Gallery画廊异步加载图片显示

**/2013.8.19_Universal_Image_Loader_Demo/res/layout/ac_image_gallery.xml

**

android:id=“@+id/gallery”

android:layout_width=“fill_parent”

android:layout_height=“wrap_content”

android:layout_gravity=“center_vertical”

android:spacing=“1dip” />

/2013.8.19_Universal_Image_Loader_Demo/res/layout/item_gallery_image.xml

android:id=“@+id/image”

android:layout_width=“120dip”

android:layout_height=“120dip”

android:layout_gravity=“center”

android:adjustViewBounds=“true”

android:contentDescription=“@string/descr_image”

android:scaleType=“centerCrop” />

还有一个就是桌面小部件

以上只是布局文件,没有什么可以说,具体Activity代码实现如下:

先是这个:

/2013.8.19_Universal_Image_Loader_Demo/src/com/nostra13/example/universalimageloader/HomeActivity.java

主界面Activity代码

/*******************************************************************************

  • Copyright 2011-2013 Sergey Tarasevich

  • Licensed under the Apache License, Version 2.0 (the “License”);

  • you may not use this file except in compliance with the License.

  • You may obtain a copy of the License at

  • http://www.apache.org/licenses/LICENSE-2.0

  • Unless required by applicable law or agreed to in writing, software

  • distributed under the License is distributed on an “AS IS” BASIS,

  • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  • See the License for the specific language governing permissions and

  • limitations under the License.

*******************************************************************************/

package com.nostra13.example.universalimageloader;

import static com.nostra13.example.universalimageloader.Constants.IMAGES;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import com.nostra13.example.universalimageloader.Constants.Extra;

import com.nostra13.universalimageloader.utils.L;

/**

  • @author Sergey Tarasevich (nostra13[at]gmail[dot]com)

*/

public class HomeActivity extends BaseActivity {

private static final String TEST_FILE_NAME = “Universal Image Loader @#&=±_.,!()~'%20.png”;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.ac_home);

// 定义文件对象,目录:/mnt/sdcard, 文件名:TEST_FILE_NAME

File testImageOnSdCard = new File(“/mnt/sdcard”, TEST_FILE_NAME);

if (!testImageOnSdCard.exists()) { // 如果文件不存在

// 把文件复制到SD卡

copyTestImageToSdCard(testImageOnSdCard);

}

}

// 点击进入ListView展示界面

public void onImageListClick(View view) {

Intent intent = new Intent(this, ImageListActivity.class);

intent.putExtra(Extra.IMAGES, IMAGES);

startActivity(intent);

}

// 点击进入GridView展示界面

public void onImageGridClick(View view) {

Intent intent = new Intent(this, ImageGridActivity.class);

intent.putExtra(Extra.IMAGES, IMAGES);

startActivity(intent);

}

// 点击进入ViewPager展示界面

public void onImagePagerClick(View view) {

Intent intent = new Intent(this, ImagePagerActivity.class);

intent.putExtra(Extra.IMAGES, IMAGES);

startActivity(intent);

}

// 点击进入画廊展示界面

public void onImageGalleryClick(View view) {

Intent intent = new Intent(this, ImageGalleryActivity.class);

intent.putExtra(Extra.IMAGES, IMAGES);

startActivity(intent);

}

@Override

public void onBackPressed() {

imageLoader.stop(); // 停止加载图片

super.onBackPressed();

}

/**

  • 开一个线程把assert目录下的图片复制到SD卡目录下

  • @param testImageOnSdCard

*/

private void copyTestImageToSdCard(final File testImageOnSdCard) {

new Thread(new Runnable() {

@Override

public void run() {

try {

InputStream is = getAssets().open(TEST_FILE_NAME);

FileOutputStream fos = new FileOutputStream(testImageOnSdCard);

byte[] buffer = new byte[8192];

int read;

try {

while ((read = is.read(buffer)) != -1) {

fos.write(buffer, 0, read); // 写入输出流

}

} finally {

fos.flush(); // 写入SD卡

fos.close(); // 关闭输出流

is.close(); // 关闭输入流

}

} catch (IOException e) {

L.w(“Can’t copy test image onto SD card”);

}

}

}).start(); // 启动线程

}

}

/2013.8.19_Universal_Image_Loader_Demo/src/com/nostra13/example/universalimageloader/ BaseActivity.java

/*******************************************************************************

  • Copyright 2011-2013 Sergey Tarasevich

  • Licensed under the Apache License, Version 2.0 (the “License”);

  • you may not use this file except in compliance with the License.

  • You may obtain a copy of the License at

  • http://www.apache.org/licenses/LICENSE-2.0

  • Unless required by applicable law or agreed to in writing, software

  • distributed under the License is distributed on an “AS IS” BASIS,

  • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  • See the License for the specific language governing permissions and

  • limitations under the License.

*******************************************************************************/

package com.nostra13.example.universalimageloader;

import android.app.Activity;

import android.view.Menu;

import android.view.MenuItem;

import com.nostra13.universalimageloader.core.ImageLoader;

/**

  • @author Sergey Tarasevich (nostra13[at]gmail[dot]com)

*/

public abstract class BaseActivity extends Activity {

protected ImageLoader imageLoader = ImageLoader.getInstance();

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// 加载菜单

getMenuInflater().inflate(R.menu.main_menu, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.item_clear_memory_cache:

imageLoader.clearMemoryCache(); // 清除内存缓存

return true;

case R.id.item_clear_disc_cache:

imageLoader.clearDiscCache(); // 清除SD卡中的缓存

return true;

default:

return false;

}

}

}

/2013.8.19_Universal_Image_Loader_Demo/src/com/nostra13/example/universalimageloader/AbsListViewBaseActivity.java

/*******************************************************************************

  • Copyright 2011-2013 Sergey Tarasevich

  • Licensed under the Apache License, Version 2.0 (the “License”);

  • you may not use this file except in compliance with the License.

  • You may obtain a copy of the License at

  • http://www.apache.org/licenses/LICENSE-2.0

  • Unless required by applicable law or agreed to in writing, software

  • distributed under the License is distributed on an “AS IS” BASIS,

  • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  • See the License for the specific language governing permissions and

  • limitations under the License.

*******************************************************************************/

package com.nostra13.example.universalimageloader;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.widget.AbsListView;

import com.nostra13.universalimageloader.core.assist.PauseOnScrollListener;

/**

  • @author Sergey Tarasevich (nostra13[at]gmail[dot]com)

*/

public class AbsListViewBaseActivity extends BaseActivity {

protected static final String STATE_PAUSE_ON_SCROLL = “STATE_PAUSE_ON_SCROLL”;

protected static final String STATE_PAUSE_ON_FLING = “STATE_PAUSE_ON_FLING”;

protected AbsListView listView;

protected boolean pauseOnScroll = false;

protected boolean pauseOnFling = true;

@Override

public void onRestoreInstanceState(Bundle savedInstanceState) {

pauseOnScroll = savedInstanceState.getBoolean(STATE_PAUSE_ON_SCROLL, false);

pauseOnFling = savedInstanceState.getBoolean(STATE_PAUSE_ON_FLING, true);

}

@Override

public void onResume() {

super.onResume();

applyScrollListener();

}

private void applyScrollListener() {

listView.setOnScrollListener(new PauseOnScrollListener(imageLoader, pauseOnScroll, pauseOnFling));

}

@Override

public void onSaveInstanceState(Bundle outState) {

outState.putBoolean(STATE_PAUSE_ON_SCROLL, pauseOnScroll);

outState.putBoolean(STATE_PAUSE_ON_FLING, pauseOnFling);

}

@Override

public boolean onPrepareOptionsMenu(Menu menu) {

MenuItem pauseOnScrollItem = menu.findItem(R.id.item_pause_on_scroll);

pauseOnScrollItem.setVisible(true);

pauseOnScrollItem.setChecked(pauseOnScroll);

MenuItem pauseOnFlingItem = menu.findItem(R.id.item_pause_on_fling);

pauseOnFlingItem.setVisible(true);

pauseOnFlingItem.setChecked(pauseOnFling);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.item_pause_on_scroll:

pauseOnScroll = !pauseOnScroll;

item.setChecked(pauseOnScroll);

applyScrollListener();

return true;

case R.id.item_pause_on_fling:

pauseOnFling = !pauseOnFling;

item.setChecked(pauseOnFling);

applyScrollListener();

return true;

default:

return super.onOptionsItemSelected(item);

}

}

}

/2013.8.19_Universal_Image_Loader_Demo/src/com/nostra13/example/universalimageloader/Constants.java

常量类代码

/*******************************************************************************

  • Copyright 2011-2013 Sergey Tarasevich

  • Licensed under the Apache License, Version 2.0 (the “License”);

  • you may not use this file except in compliance with the License.

  • You may obtain a copy of the License at

  • http://www.apache.org/licenses/LICENSE-2.0

  • Unless required by applicable law or agreed to in writing, software

  • distributed under the License is distributed on an “AS IS” BASIS,

  • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  • See the License for the specific language governing permissions and

  • limitations under the License.

*******************************************************************************/

package com.nostra13.example.universalimageloader;

/**

  • @author Sergey Tarasevich (nostra13[at]gmail[dot]com)

  • 常量类

*/

public final class Constants {

// 一堆图片链接

public static final String[] IMAGES = new String[] {

// Heavy images

“https://lh6.googleusercontent.com/-jZgveEqb6pg/T3R4kXScycI/AAAAAAAAAE0/xQ7CvpfXDzc/s1024/sample_image_01.jpg”,

“https://lh4.googleusercontent.com/-K2FMuOozxU0/T3R4lRAiBTI/AAAAAAAAAE8/a3Eh9JvnnzI/s1024/sample_image_02.jpg”,

“https://lh5.googleusercontent.com/-SCS5C646rxM/T3R4l7QB6xI/AAAAAAAAAFE/xLcuVv3CUyA/s1024/sample_image_03.jpg”,

“https://lh6.googleusercontent.com/-f0NJR6-_Thg/T3R4mNex2wI/AAAAAAAAAFI/45oug4VE8MI/s1024/sample_image_04.jpg”,

“https://lh3.googleusercontent.com/-n-xcJmiI0pg/T3R4mkSchHI/AAAAAAAAAFU/EoiNNb7kk3A/s1024/sample_image_05.jpg”,

“https://lh3.googleusercontent.com/-X43vAudm7f4/T3R4nGSChJI/AAAAAAAAAFk/3bna6D-2EE8/s1024/sample_image_06.jpg”,

“https://lh5.googleusercontent.com/-MpZneqIyjXU/T3R4nuGO1aI/AAAAAAAAAFg/r09OPjLx1ZY/s1024/sample_image_07.jpg”,

“https://lh6.googleusercontent.com/-ql3YNfdClJo/T3XvW9apmFI/AAAAAAAAAL4/_6HFDzbahc4/s1024/sample_image_08.jpg”,

“https://lh5.googleusercontent.com/-Pxa7eqF4cyc/T3R4oasvPEI/AAAAAAAAAF0/-uYDH92h8LA/s1024/sample_image_09.jpg”,

“https://lh4.googleusercontent.com/-Li-rjhFEuaI/T3R4o-VUl4I/AAAAAAAAAF8/5E5XdMnP1oE/s1024/sample_image_10.jpg”,

“https://lh5.googleusercontent.com/-_HU4fImgFhA/T3R4pPVIwWI/AAAAAAAAAGA/0RfK_Vkgth4/s1024/sample_image_11.jpg”,

“https://lh6.googleusercontent.com/-0gnNrVjwa0Y/T3R4peGYJwI/AAAAAAAAAGU/uX_9wvRPM9I/s1024/sample_image_12.jpg”,

“https://lh3.googleusercontent.com/-HBxuzALS_Zs/T3R4qERykaI/AAAAAAAAAGQ/_qQ16FaZ1q0/s1024/sample_image_13.jpg”,

“https://lh4.googleusercontent.com/-cKojDrARNjQ/T3R4qfWSGPI/AAAAAAAAAGY/MR5dnbNaPyY/s1024/sample_image_14.jpg”,

“https://lh3.googleusercontent.com/-WujkdYfcyZ8/T3R4qrIMGUI/AAAAAAAAAGk/277LIdgvnjg/s1024/sample_image_15.jpg”,

“https://lh6.googleusercontent.com/-FMHR7Vy3PgI/T3R4rOXlEKI/AAAAAAAAAGs/VeXrDNDBkaw/s1024/sample_image_16.jpg”,

“https://lh4.googleusercontent.com/-mrR0AJyNTH0/T3R4rZs6CuI/AAAAAAAAAG0/UE1wQqCOqLA/s1024/sample_image_17.jpg”,

“https://lh6.googleusercontent.com/-z77w0eh3cow/T3R4rnLn05I/AAAAAAAAAG4/BaerfWoNucU/s1024/sample_image_18.jpg”,

“https://lh5.googleusercontent.com/-aWVwh1OU5Bk/T3R4sAWw0yI/AAAAAAAAAHE/4_KAvJttFwA/s1024/sample_image_19.jpg”,

“https://lh6.googleusercontent.com/-q-js52DMnWQ/T3R4tZhY2sI/AAAAAAAAAHM/A8kjp2Ivdqg/s1024/sample_image_20.jpg”,

“https://lh5.googleusercontent.com/-_jIzvvzXKn4/T3R4t7xpdVI/AAAAAAAAAHU/7QC6eZ10jgs/s1024/sample_image_21.jpg”,

“https://lh3.googleusercontent.com/-lnGi4IMLpwU/T3R4uCMa7vI/AAAAAAAAAHc/1zgzzz6qTpk/s1024/sample_image_22.jpg”,

“https://lh5.googleusercontent.com/-fFCzKjFPsPc/T3R4u0SZPFI/AAAAAAAAAHk/sbgjzrktOK0/s1024/sample_image_23.jpg”,

“https://lh4.googleusercontent.com/-8TqoW5gBE_Y/T3R4vBS3NPI/AAAAAAAAAHs/EZYvpNsaNXk/s1024/sample_image_24.jpg”,

“https://lh6.googleusercontent.com/-gc4eQ3ySdzs/T3R4vafoA7I/AAAAAAAAAH4/yKii5P6tqDE/s1024/sample_image_25.jpg”,

“https://lh5.googleusercontent.com/–NYOPCylU7Q/T3R4vjAiWkI/AAAAAAAAAH8/IPNx5q3ptRA/s1024/sample_image_26.jpg”,

“https://lh6.googleusercontent.com/-9IJM8so4vCI/T3R4vwJO2yI/AAAAAAAAAIE/ljlr-cwuqZM/s1024/sample_image_27.jpg”,

“https://lh4.googleusercontent.com/-KW6QwOHfhBs/T3R4w0RsQiI/AAAAAAAAAIM/uEFLVgHPFCk/s1024/sample_image_28.jpg”,

“https://lh4.googleusercontent.com/-z2557Ec1ctY/T3R4x3QA2hI/AAAAAAAAAIk/9-GzPL1lTWE/s1024/sample_image_29.jpg”,

“https://lh5.googleusercontent.com/-LaKXAn4Kr1c/T3R4yc5b4lI/AAAAAAAAAIY/fMgcOVQfmD0/s1024/sample_image_30.jpg”,

“https://lh4.googleusercontent.com/-F9LRToJoQdo/T3R4yrLtyQI/AAAAAAAAAIg/ri9uUCWuRmo/s1024/sample_image_31.jpg”,

“https://lh4.googleusercontent.com/-6X-xBwP-QpI/T3R4zGVboII/AAAAAAAAAIs/zYH4PjjngY0/s1024/sample_image_32.jpg”,

“https://lh5.googleusercontent.com/-VdLRjbW4LAs/T3R4zXu3gUI/AAAAAAAAAIw/9aFp9t7mCPg/s1024/sample_image_33.jpg”,

“https://lh6.googleusercontent.com/-gL6R17_fDJU/T3R4zpIXGjI/AAAAAAAAAI8/Q2Vjx-L9X20/s1024/sample_image_34.jpg”,

“https://lh3.googleusercontent.com/-1fGH4YJXEzo/T3R40Y1B7KI/AAAAAAAAAJE/MnTsa77g-nk/s1024/sample_image_35.jpg”,

“https://lh4.googleusercontent.com/-Ql0jHSrea-A/T3R403mUfFI/AAAAAAAAAJM/qzI4SkcH9tY/s1024/sample_image_36.jpg”,

“https://lh5.googleusercontent.com/-BL5FIBR_tzI/T3R41DA0AKI/AAAAAAAAAJk/GZfeeb-SLM0/s1024/sample_image_37.jpg”,

“https://lh4.googleusercontent.com/-wF2Vc9YDutw/T3R41fR2BCI/AAAAAAAAAJc/JdU1sHdMRAk/s1024/sample_image_38.jpg”,

“https://lh6.googleusercontent.com/-ZWHiPehwjTI/T3R41zuaKCI/AAAAAAAAAJg/hR3QJ1v3REg/s1024/sample_image_39.jpg”,

// Light images

“http://tabletpcssource.com/wp-content/uploads/2011/05/android-logo.png”,

“http://simpozia.com/pages/images/stories/windows-icon.png”,

“https://si0.twimg.com/profile_images/1135218951/gmail_profile_icon3_normal.png”,

“http://www.krify.net/wp-content/uploads/2011/09/Macromedia_Flash_dock_icon.png”,

“http://radiotray.sourceforge.net/radio.png”,

“http://www.bandwidthblog.com/wp-content/uploads/2011/11/twitter-logo.png”,

“http://weloveicons.s3.amazonaws.com/icons/100907_itunes1.png”,

“http://weloveicons.s3.amazonaws.com/icons/100929_applications.png”,

“http://www.idyllicmusic.com/index_files/get_apple-iphone.png”,

“http://www.frenchrevolutionfood.com/wp-content/uploads/2009/04/Twitter-Bird.png”,

“http://3.bp.blogspot.com/-ka5MiRGJ_S4/TdD9OoF6bmI/AAAAAAAAE8k/7ydKtptUtSg/s1600/Google_Sky%2BMaps_Android.png”,

“http://www.desiredsoft.com/images/icon_webhosting.png”,

“http://goodereader.com/apps/wp-content/uploads/downloads/thumbnails/2012/01/hi-256-0-99dda8c730196ab93c67f0659d5b8489abdeb977.png”,

“http://1.bp.blogspot.com/-mlaJ4p_3rBU/TdD9OWxN8II/AAAAAAAAE8U/xyynWwr3_4Q/s1600/antivitus_free.png”,

“http://cdn3.iconfinder.com/data/icons/transformers/computer.png”,

“http://cdn.geekwire.com/wp-content/uploads/2011/04/firefox.png?7794fe”,

“https://ssl.gstatic.com/android/market/com.rovio.angrybirdsseasons/hi-256-9-347dae230614238a639d21508ae492302340b2ba”,

“http://androidblaze.com/wp-content/uploads/2011/12/tablet-pc-256x256.jpg”,

“http://www.theblaze.com/wp-content/uploads/2011/08/Apple.png”,

“http://1.bp.blogspot.com/-y-HQwQ4Kuu0/TdD9_iKIY7I/AAAAAAAAE88/3G4xiclDZD0/s1600/Twitter_Android.png”,

“http://3.bp.blogspot.com/-nAf4IMJGpc8/TdD9OGNUHHI/AAAAAAAAE8E/VM9yU_lIgZ4/s1600/Adobe%2BReader_Android.png”,

“http://cdn.geekwire.com/wp-content/uploads/2011/05/oovoo-android.png?7794fe”,

“http://icons.iconarchive.com/icons/kocco/ndroid/128/android-market-2-icon.png”,

“http://thecustomizewindows.com/wp-content/uploads/2011/11/Nicest-Android-Live-Wallpapers.png”,

“http://c.wrzuta.pl/wm16596/a32f1a47002ab3a949afeb4f”,

“http://macprovid.vo.llnwd.net/o43/hub/media/1090/6882/01_headline_Muse.jpg”,

// Special cases

“http://cdn.urbanislandz.com/wp-content/uploads/2011/10/MMSposter-large.jpg”, // very large image

“file:///sdcard/Universal Image Loader @#&=±_.,!()~'%20.png”, // Image from SD card with encoded symbols

“assets://Liv 《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》无偿开源 徽信搜索公众号【编程进阶路】 ing Things @#&=±_.,!()~'%20.jpg”, // Image from assets

“drawable://” + R.drawable.ic_launcher, // Image from drawables

“http://upload.wikimedia.org/wikipedia/ru/b/b6/袣邪泻_泻芯褌_褋_屑褘褕邪屑懈_胁芯械胁邪谢.png”, // Link with UTF-8

“https://www.eff.org/sites/default/files/chrome150_0.jpg”, // Image from HTTPS

“http://bit.ly/soBiXr”, // Redirect link

“http://img001.us.expono.com/100001/100001-1bc30-2d736f_m.jpg”, // EXIF

“”, // Empty link

“http://wrong.site.com/corruptedLink”, // Wrong link

};

private Constants() {

}

// 配置

public static class Config {

public static final boolean DEVELOPER_MODE = false;

}

// 额外类

public static class Extra {

public static final String IMAGES = “com.nostra13.example.universalimageloader.IMAGES”;

public static final String IMAGE_POSITION = “com.nostra13.example.universalimageloader.IMAGE_POSITION”;

}

}

/2013.8.19_Universal_Image_Loader_Demo/src/com/nostra13/example/universalimageloader/ImageListActivity.java

/*******************************************************************************

  • Copyright 2011-2013 Sergey Tarasevich

  • Licensed under the Apache License, Version 2.0 (the “License”);

  • you may not use this file except in compliance with the License.

  • You may obtain a copy of the License at

  • http://www.apache.org/licenses/LICENSE-2.0

  • Unless required by applicable law or agreed to in writing, software

  • distributed under the License is distributed on an “AS IS” BASIS,

  • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  • See the License for the specific language governing permissions and

  • limitations under the License.

*******************************************************************************/

package com.nostra13.example.universalimageloader;

import java.util.Collections;

import java.util.LinkedList;

import java.util.List;

import android.content.Intent;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.ListView;

import android.widget.TextView;

import com.nostra13.example.universalimageloader.Constants.Extra;

import com.nostra13.universalimageloader.core.DisplayImageOptions;

import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;

import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;

import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;

/**

  • @author Sergey Tarasevich (nostra13[at]gmail[dot]com)

*/

public class ImageListActivity extends AbsListViewBaseActivity {

DisplayImageOptions options; // DisplayImageOptions是用于设置图片显示的类

String[] imageUrls; // 图片路径

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.ac_image_list);

Bundle bundle = getIntent().getExtras();

imageUrls = bundle.getStringArray(Extra.IMAGES);

// 使用DisplayImageOptions.Builder()创建DisplayImageOptions

options = new DisplayImageOptions.Builder()

.showStubImage(R.drawable.ic_stub) // 设置图片下载期间显示的图片

.showImageForEmptyUri(R.drawable.ic_empty) // 设置图片Uri为空或是错误的时候显示的图片

.showImageOnFail(R.drawable.ic_error) // 设置图片加载或解码过程中发生错误显示的图片

.cacheInMemory(true) // 设置下载的图片是否缓存在内存中

.cacheOnDisc(true) // 设置下载的图片是否缓存在SD卡中

.displayer(new RoundedBitmapDisplayer(20)) // 设置成圆角图片

.build(); // 创建配置过得DisplayImageOption对象

listView = (ListView) findViewById(android.R.id.list);

((ListView) listView).setAdapter(new ItemAdapter());

listView.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView parent, View view, int position, long id) {

// 点击列表项转入ViewPager显示界面

startImagePagerActivity(position);

}

});

}

@Override

public void onBackPressed() {

AnimateFirstDisplayListener.displayedImages.clear();

super.onBackPressed();

}

private void startImagePagerActivity(int position) {

Intent intent = new Intent(this, ImagePagerActivity.class);

intent.putExtra(Extra.IMAGES, imageUrls);

intent.putExtra(Extra.IMAGE_POSITION, position);

startActivity(intent);

}

/**

  • 自定义列表项适配器

*/

class ItemAdapter extends BaseAdapter {

private ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();

private class ViewHolder {

public TextView text;

public ImageView image;

}

@Override

public int getCount() {

return imageUrls.length;

}

@Override

public Object getItem(int position) {

return position;

}

@Override

public long getItemId(int position) {

return position;

}

@Override

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

View view = convertView;

final ViewHolder holder;

if (convertView == null) {

view = getLayoutInflater().inflate(R.layout.item_list_image, parent, false);

holder = new ViewHolder();

holder.text = (TextView) view.findViewById(R.id.text);

holder.image = (ImageView) view.findViewById(R.id.image);

view.setTag(holder); // 给View添加一个格外的数据

} else {

holder = (ViewHolder) view.getTag(); // 把数据取出来

}

holder.text.setText("Item " + (position + 1)); // TextView设置文本

/**

  • 显示图片

  • 参数1:图片url

  • 参数2:显示图片的控件

  • 参数3:显示图片的设置

  • 参数4:监听器

*/

imageLoader.displayImage(imageUrls[position], holder.image, options, animateFirstListener);

return view;

}

}

/**

  • 图片加载第一次显示监听器

  • @author Administrator

*/

private static class AnimateFirstDisplayListener extends SimpleImageLoadingListener {

static final List displayedImages = Collections.synchronizedList(new LinkedList());

@Override

public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {

if (loadedImage != null) {

ImageView imageView = (ImageView) view;

// 是否第一次显示

boolean firstDisplay = !displayedImages.contains(imageUri);

if (firstDisplay) {

// 图片淡入效果

FadeInBitmapDisplayer.animate(imageView, 500);

displayedImages.add(imageUri);

}

}

}

}

}

/2013.8.19_Universal_Image_Loader_Demo/src/com/nostra13/example/universalimageloader/ImageGridActivity.java

网格视图Activity

/*******************************************************************************

  • Copyright 2011-2013 Sergey Tarasevich

  • Licensed under the Apache License, Version 2.0 (the “License”);

  • you may not use this file except in compliance with the License.

  • You may obtain a copy of the License at

  • http://www.apache.org/licenses/LICENSE-2.0

  • Unless required by applicable law or agreed to in writing, software

  • distributed under the License is distributed on an “AS IS” BASIS,

  • WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  • See the License for the specific language governing permissions and

  • limitations under the License.

*******************************************************************************/

package com.nostra13.example.universalimageloader;

import android.content.Intent;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import com.nostra13.example.universalimageloader.Constants.Extra;

import com.nostra13.universalimageloader.core.DisplayImageOptions;

/**

  • 网格视图显示Activity

  • @author Sergey Tarasevich (nostra13[at]gmail[dot]com)

*/

public class ImageGridActivity extends AbsListViewBaseActivity {

String[] imageUrls; // 图片Url

DisplayImageOptions options; // 显示图片的设置

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.ac_image_grid);

Bundle bundle = getIntent().getExtras();

imageUrls = bundle.getStringArray(Extra.IMAGES);

options = new DisplayImageOptions.Builder()

.showStubImage(R.drawable.ic_stub)

.showImageForEmptyUri(R.drawable.ic_empty)

.showImageOnFail(R.drawable.ic_error)

.cacheInMemory(true)

.cacheOnDisc(true)

.bitmapConfig(Bitmap.Config.RGB_565) //设置图片的解码类型

.build();

listView = (GridView) findViewById(R.id.gridview);

((GridView) listView).setAdapter(new ImageAdapter()); // 填充数据

listView.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView parent, View view, int position, long id) {

startImagePagerActivity(position);

}

});

}

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