Android UI-开源框架ImageLoader的完美例子，android页面开发

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问答

2401_84103616

984人浏览 · 2024-04-21 08:51:54

2401_84103616 · 2024-04-21 08:51:54 发布

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正文

android:layout_height=“fill_parent”

android:padding=“1dip” >

<ImageView

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” />

<ProgressBar

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

<?xml version="1.0" encoding="utf-8"?>

<Gallery xmlns:android=“http://schemas.android.com/apk/res/android”

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

<?xml version="1.0" encoding="utf-8"?>

<ImageView xmlns:android=“http://schemas.android.com/apk/res/android”

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://Living 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

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

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);

}

});

}

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);

}

public class ImageAdapter extends BaseAdapter {

@Override

public int getCount() {

return imageUrls.length;

}

@Override

public Object getItem(int position) {

return null;

}

@Override

public long getItemId(int position) {

return position;

}

@Override

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

final ImageView imageView;

if (convertView == null) {

imageView = (ImageView) getLayoutInflater().inflate(R.layout.item_grid_image, parent, false);

} else {

imageView = (ImageView) convertView;

}

// 将图片显示任务增加到执行池，图片将被显示到ImageView当轮到此ImageView

imageLoader.displayImage(imageUrls[position], imageView, options);

return imageView;

}

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

ViewPager视图Activity

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

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.graphics.Bitmap;

import android.os.Bundle;

import android.os.Parcelable;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.view.LayoutInflater;

总结

最后小编想说：不论以后选择什么方向发展，目前重要的是把Android方面的技术学好，毕竟其实对于程序员来说，要学习的知识内容、技术有太多太多，要想不被环境淘汰就只有不断提升自己，从来都是我们去适应环境，而不是环境来适应我们！

这里附上我整理的几十套腾讯、字节跳动，京东，小米，头条、阿里、美团等公司19年的Android面试题。把技术点整理成了视频和PDF（实际上比预期多花了不少精力），包含知识脉络 + 诸多细节。

由于篇幅有限，这里以图片的形式给大家展示一小部分。

网上学习 Android的资料一大堆，但如果学到的知识不成体系，遇到问题时只是浅尝辄止，不再深入研究，那么很难做到真正的技术提升。希望这份系统化的技术体系对大家有一个方向参考。

技术进阶之路很漫长，一起共勉吧~

网上学习资料一大堆，但如果学到的知识不成体系，遇到问题时只是浅尝辄止，不再深入研究，那么很难做到真正的技术提升。

需要这份系统化的资料的朋友，可以添加V获取：vip204888 （备注Android）

一个人可以走的很快，但一群人才能走的更远！不论你是正从事IT行业的老鸟或是对IT行业感兴趣的新人，都欢迎加入我们的的圈子（技术交流、学习资源、职场吐槽、大厂内推、面试辅导），让我们一起学习成长！

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.graphics.Bitmap;

import android.os.Bundle;

import android.os.Parcelable;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.view.LayoutInflater;

总结

这里附上我整理的几十套腾讯、字节跳动，京东，小米，头条、阿里、美团等公司19年的Android面试题。把技术点整理成了视频和PDF（实际上比预期多花了不少精力），包含知识脉络 + 诸多细节。

由于篇幅有限，这里以图片的形式给大家展示一小部分。

[外链图片转存中…(img-baY9ZPIH-1713660697571)]

网上学习 Android的资料一大堆，但如果学到的知识不成体系，遇到问题时只是浅尝辄止，不再深入研究，那么很难做到真正的技术提升。希望这份系统化的技术体系对大家有一个方向参考。

技术进阶之路很漫长，一起共勉吧~

网上学习资料一大堆，但如果学到的知识不成体系，遇到问题时只是浅尝辄止，不再深入研究，那么很难做到真正的技术提升。

需要这份系统化的资料的朋友，可以添加V获取：vip204888 （备注Android）
[外链图片转存中…(img-kMri1O3M-1713660697572)]

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