Android UI-开源框架ImageLoader的完美例子，正在准备面试

从界面说起，界面本身是没什么好说的，就是如何在xml当中进行定义罢了

有以下这么多个布局文件

一个一个来看呗

首先是这样的效果

这个在Android4.2.2比较好看，在Android2.3.3就显得比较挫。

/2013.8.19_Universal_Image_Loader_Demo/res/layout/ac_home.xml

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

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

android:layout_width=“fill_parent”

android:layout_height=“fill_parent” >

<LinearLayout

android:layout_width=“fill_parent”

android:layout_height=“fill_parent”

android:orientation=“vertical” >

<TextView

android:layout_width=“fill_parent”

android:layout_height=“wrap_content”

android:gravity=“center”

android:paddingBottom=“10dip”

android:paddingTop=“20dip”

android:text="@string/label_activity_examples"

android:textSize=“24sp” />

<Button

android:layout_width=“fill_parent”

android:layout_height=“wrap_content”

android:layout_margin=“10dip”

android:onClick=“onImageListClick”

android:text="@string/button_image_list" />

<Button

android:layout_width=“fill_parent”

android:layout_height=“wrap_content”

android:layout_margin=“10dip”

android:onClick=“onImageGridClick”

android:text="@string/button_image_grid" />

<Button

android:layout_width=“fill_parent”

android:layout_height=“wrap_content”

android:layout_margin=“10dip”

android:onClick=“onImagePagerClick”

android:text="@string/button_image_pager" />

<Button

android:layout_width=“fill_parent”

android:layout_height=“wrap_content”

android:layout_margin=“10dip”

android:onClick=“onImageGalleryClick”

android:text="@string/button_image_gallery" />

列表异步加载图片效果

/2013.8.19_Universal_Image_Loader_Demo/res/layout/ac_image_list.xml

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

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

android:id="@android:id/list"

android:layout_width=“fill_parent”

android:layout_height=“fill_parent” />

/2013.8.19_Universal_Image_Loader_Demo/res/layout/ item_list_image.xml

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

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

android:layout_width=“fill_parent”

android:layout_height=“wrap_content” >

<ImageView

android:id="@+id/image"

android:layout_width=“72dip”

android:layout_height=“72dip”

android:layout_margin=“3dip”

android:adjustViewBounds=“true”

android:contentDescription="@string/descr_image"

android:scaleType=“centerCrop” />

<TextView

android:id="@+id/text"

android:layout_width=“fill_parent”

android:layout_height=“wrap_content”

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

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

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

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

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

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

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

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

<android.support.v4.view.ViewPager xmlns:android=“http://schemas.android.com/apk/res/android”

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

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

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

android:layout_width=“fill_parent”

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

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

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

尾声

最后，我再重复一次，如果你想成为一个优秀的 Android 开发人员，请集中精力，对基础和重要的事情做深度研究。

对于很多初中级Android工程师而言，想要提升技能，往往是自己摸索成长，不成体系的学习效果低效漫长且无助。整理的这些架构技术希望对Android开发的朋友们有所参考以及少走弯路，本文的重点是你有没有收获与成长，其余的都不重要，希望读者们能谨记这一点。

最后想要拿高薪实现技术提升薪水得到质的飞跃。最快捷的方式，就是有人可以带着你一起分析，这样学习起来最为高效，所以为了大家能够顺利进阶中高级、架构师，我特地为大家准备了一套高手学习的源码和框架视频等精品Android架构师教程，保证你学了以后保证薪资上升一个台阶。

当你有了学习线路，学习哪些内容，也知道以后的路怎么走了，理论看多了总要实践的。

进阶学习视频

附上：我们之前因为秋招收集的二十套一二线互联网公司Android面试真题 （含BAT、小米、华为、美团、滴滴）和我自己整理Android复习笔记（包含Android基础知识点、Android扩展知识点、Android源码解析、设计模式汇总、Gradle知识点、常见算法题汇总。）

imateFirstListener = 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

尾声

最后，我再重复一次，如果你想成为一个优秀的 Android 开发人员，请集中精力，对基础和重要的事情做深度研究。

当你有了学习线路，学习哪些内容，也知道以后的路怎么走了，理论看多了总要实践的。

进阶学习视频

[外链图片转存中…(img-ysdBXYCr-1643868555898)]

[外链图片转存中…(img-gZGhc4uz-1643868555899)]

本文已被CODING开源项目：《Android学习笔记总结+移动架构视频+大厂面试真题+项目实战源码》收录

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尾声

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