三星手机助手怎么设置添加图片到手机SD卡 以前弄的全部都保存到手机内存了_百度知道
三星手机助手怎么设置添加图片到手机SD卡 以前弄的全部都保存到手机内存了
若将手机中的文件与外置SD卡互相转移，请操作：1.若是将存储在话机中的多媒体文件移动到SD卡中：我的文件-所有文件-sdcard0-查找需要移动的文件夹-长按住不松手-移动至（若没有此菜单，请点击菜单键-移动）-返回到external_sd-点击&移动到此处&。反之亦然。2.若将手机应用程序移动到SD卡中，建议尝试：1).若手机系统是安卓2.3版本，支持将安装的应用程序移动到外置SD卡。操作：设置-应用程序-管理应用程序-选中某个程序-移至SD卡。2).若手机系统是4.0、4.1版本，应用程序不支持移动到内存卡。3).若使用的是安卓4.2/4.3/4.4操作系统（包括部分升级到安卓4.3的机型），如需将软件移动到外置SD卡，请尝试：设定-更多（一般）应用程序管理器-选中某个程序-移动到SD卡（若没有此选项，则不支持该功能）。注：不是所有的程序均可移至到SD卡，具体根据所下载的软件决定。
其他类似问题
为您推荐：
提问者采纳
“我的文件”-“设定”-“设置图片主目录”
能不能具体点啊？哪个我的文件啊
我和你一样的手机。应用程序中就有一个图标“我的文件”
手机上的 应用程序管理器？还是什么？
不会是你把那个东西删除了吧。不是管理器。就是一个程序图标。
提问者评价
其他2条回答
你只要打开360手机助手界面上 右上角有个类似于 ↓ 的按钮，打开里面有 设置 在设置中把安装目录设置为SD卡就可以了。
用电脑来......
恩恩 我在用电脑 然后呢？》
360手机助手的相关知识
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出门在外也不愁怎么把修改后的图片在存入SD卡中
[问题点数：40分，结帖人ZHAOCHUANsuxiaoyu]
怎么把修改后的图片在存入SD卡中
[问题点数：40分，结帖人ZHAOCHUANsuxiaoyu]
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Android 高手进阶（21）
作者同类文章X
转载请注明出处package com.example.
import java.io.F
import java.io.FileOutputS
import java.io.IOE
import android.content.C
import android.graphics.B
import android.pressF
import android.graphics.BitmapF
import android.os.E
public class FileUtils {
* sd卡的根目录
private static String mSdRootPath = Environment.getExternalStorageDirectory().getPath();
* 手机的缓存根目录
private static String mDataRootPath =
* 保存Image的目录名
private final static String FOLDER_NAME = &/AndroidImage&;
public FileUtils(Context context){
mDataRootPath = context.getCacheDir().getPath();
* 获取储存Image的目录
private String getStorageDirectory(){
return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) ?
mSdRootPath + FOLDER_NAME : mDataRootPath + FOLDER_NAME;
* 保存Image的方法，有sd卡存储到sd卡，没有就存储到手机目录
* @param fileName
* @param bitmap
* @throws IOException
public void savaBitmap(String fileName, Bitmap bitmap) throws IOException{
if(bitmap == null){
String path = getStorageDirectory();
File folderFile = new File(path);
if(!folderFile.exists()){
folderFile.mkdir();
File file = new File(path + File.separator + fileName);
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
press(CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
* 从手机或者sd卡获取Bitmap
* @param fileName
public Bitmap getBitmap(String fileName){
return BitmapFactory.decodeFile(getStorageDirectory() + File.separator + fileName);
* 判断文件是否存在
* @param fileName
public boolean isFileExists(String fileName){
return new File(getStorageDirectory() + File.separator + fileName).exists();
* 获取文件的大小
* @param fileName
public long getFileSize(String fileName) {
return new File(getStorageDirectory() + File.separator + fileName).length();
* 删除SD卡或者手机的缓存图片和目录
public void deleteFile() {
File dirFile = new File(getStorageDirectory());
if(! dirFile.exists()){
if (dirFile.isDirectory()) {
String[] children = dirFile.list();
for (int i = 0; i & children. i++) {
new File(dirFile, children[i]).delete();
dirFile.delete();
}package com.example.
public class Images {
public final static String[] imageThumbUrls = new String[] {
&/-55osAWw3x0Q/URquUtcFr5I/AAAAAAAAAbs/rWlj1RUKrYI/s160-c/A%252520Photographer.jpg&,
&/--dq8niRp7W4/URquVgmXvgI/AAAAAAAAAbs/-gnuLQfNnBA/s160-c/A%252520Song%252520of%252520Ice%252520and%252520Fire.jpg&,
&/-7qZeDtRKFKc/URquWZT1gOI/AAAAAAAAAbs/hqWgteyNXsg/s160-c/Another%252520Rockaway%252520Sunset.jpg&,
&/--L0Km39l5J8/URquXHGcdNI/AAAAAAAAAbs/3ZrSJNrSomQ/s160-c/Antelope%252520Butte.jpg&,
&/-8HO-4vIFnlw/URquZnsFgtI/AAAAAAAAAbs/WT8jViTF7vw/s160-c/Antelope%252520Hallway.jpg&,
&/-WIuWgVcU3Qw/URqubRVcj4I/AAAAAAAAAbs/YvbwgGjwdIQ/s160-c/Antelope%252520Walls.jpg&,
&/-UBmLbPELvoQ/URqucCdv0kI/AAAAAAAAAbs/IdNhr2VQoQs/s160-c/Apre%2525CC%2520la%252520Pluie.jpg&,
&/-s-AFpvgSeew/URquc6dF-JI/AAAAAAAAAbs/Mt3xNGRUd68/s160-c/Backlit%252520Cloud.jpg&,
&/-bvmif9a9YOQ/URquea3heHI/AAAAAAAAAbs/rcr6wyeQtAo/s160-c/Bee%252520and%252520Flower.jpg&,
&/-n7mdm7I7FGs/URqueT_BT-I/AAAAAAAAAbs/9MYmXlmpSAo/s160-c/Bonzai%252520Rock%252520Sunset.jpg&,
&/-4CN4X4t0M1k/URqufPozWzI/AAAAAAAAAbs/8wK41lg1KPs/s160-c/Caterpillar.jpg&,
&/-rrFnVC8xQEg/URqufdrLBaI/AAAAAAAAAbs/s69WYy_fl1E/s160-c/Chess.jpg&,
&/-WVpRptWH8Yw/URqugh-QmDI/AAAAAAAAAbs/E-MgBgtlUWU/s160-c/Chihuly.jpg&,
&/-0BDXkYmckbo/URquhKFW84I/AAAAAAAAAbs/ogQtHCTk2JQ/s160-c/Closed%252520Door.jpg&,
&/-PyggXXZRykM/URquh-kVvoI/AAAAAAAAAbs/hFtDwhtrHHQ/s160-c/Colorado%252520River%252520Sunset.jpg&,
&/-ZAs4dNZtALc/URquikvOCWI/AAAAAAAAAbs/DXz4h3dll1Y/s160-c/Colors%252520of%252520Autumn.jpg&,
&/-GztnWEIiMz8/URqukVCU7bI/AAAAAAAAAbs/jo2Hjv6MZ6M/s160-c/Countryside.jpg&,
&/-bEg9EZ9QoiM/URquklz3FGI/AAAAAAAAAbs/UUuv8Ac2BaE/s160-c/Death%252520Valley%2520Dunes.jpg&,
&/-ijQJ8W68tEE/URqulGkvFEI/AAAAAAAAAbs/zPXvIwi_rFw/s160-c/Delicate%252520Arch.jpg&,
&/-Oh8mMy2ieng/URqullDwehI/AAAAAAAAAbs/TbdeEfsaIZY/s160-c/Despair.jpg&,
&/-gl0y4UiAOlk/URqumC_KjBI/AAAAAAAAAbs/PM1eT7dn4oo/s160-c/Eagle%252520Fall%252520Sunrise.jpg&,
&/-hYYHd2_vXPQ/URqumtJa9eI/AAAAAAAAAbs/wAalXVkbSh0/s160-c/Electric%252520Storm.jpg&,
&/-PyY_yiyjPTo/URqunUOhHFI/AAAAAAAAAbs/azZoULNuJXc/s160-c/False%252520Kiva.jpg&,
&/-PYvLVdvXywk/URqunwd8hfI/AAAAAAAAAbs/qiMwgkFvf6I/s160-c/Fitzgerald%252520Streaks.jpg&,
&/-KIR_UobIIqY/URquoCZ9SlI/AAAAAAAAAbs/Y4d4q8sXu4c/s160-c/Foggy%252520Sunset.jpg&,
&/-9lzOk_OWZH0/URquoo4xYoI/AAAAAAAAAbs/AwgzHtNVCwU/s160-c/Frantic.jpg&,
&/-0X3JNaKaz48/URqupH78wpI/AAAAAAAAAbs/lHXxu_zbH8s/s160-c/Golden%252520Gate%252520Afternoon.jpg&,
&/-95sb5ag7ABc/URqupl95RDI/AAAAAAAAAbs/g73R20iVTRA/s160-c/Golden%252520Gate%252520Fog.jpg&,
&/-JB9v6rtgHhk/URqup21F-zI/AAAAAAAAAbs/64Fb8qMZWXk/s160-c/Golden%252520Grass.jpg&,
&/-EIBGfnuLtII/URquqVHwaRI/AAAAAAAAAbs/FA4McV2u8VE/s160-c/Grand%252520Teton.jpg&,
&/-WoMxZvmN9nY/URquq1v2AoI/AAAAAAAAAbs/grj5uMhL6NA/s160-c/Grass%252520Closeup.jpg&,
&/-6hZiEHXx64Q/URqurxvNdqI/AAAAAAAAAbs/kWMXM3o5OVI/s160-c/Green%252520Grass.jpg&,
&/-6LVb9OXtQ60/URquteBFuKI/AAAAAAAAAbs/4F4kRgecwFs/s160-c/Hanging%252520Leaf.jpg&,
&/-zAvf__52ONk/URqutT_IuxI/AAAAAAAAAbs/D_bcuc0thoU/s160-c/Highway%2525201.jpg&,
&/-H4SrUg615rA/URquuL27fXI/AAAAAAAAAbs/4aEqJfiMsOU/s160-c/Horseshoe%252520Bend%252520Sunset.jpg&,
&/-JhFi4fb_Pqw/URquuX-QXbI/AAAAAAAAAbs/IXpYUxuweYM/s160-c/Horseshoe%252520Bend.jpg&,
&/-UGgssvFRJ7g/URquueyJzGI/AAAAAAAAAbs/yYIBlLT0toM/s160-c/Into%252520the%252520Blue.jpg&,
&/-CH7KoupI7uI/URquu0FF__I/AAAAAAAAAbs/R7GDmI7v_G0/s160-c/Jelly%252520Fish%2525202.jpg&,
&/-pwuuw6yhg8U/URquvPxR3FI/AAAAAAAAAbs/VNGk6f-tsGE/s160-c/Jelly%252520Fish%2525203.jpg&,
&/-GoUQVw1fnFw/URquv6xbC0I/AAAAAAAAAbs/zEUVTQQ43Zc/s160-c/Kauai.jpg&,
&/-8QdYYQEpYjw/URquwvdh88I/AAAAAAAAAbs/cktDy-ysfHo/s160-c/Kyoto%252520Sunset.jpg&,
&/-vPeekyDjOE0/URquwzJ28qI/AAAAAAAAAbs/qxcyXULsZrg/s160-c/Lake%252520Tahoe%252520Colors.jpg&,
&/-xBPxWpD4yxU/URquxWHk8AI/AAAAAAAAAbs/ARDPeDYPiMY/s160-c/Lava%252520from%252520the%252520Sky.jpg&,
&/-897VXrJB6RE/URquxxxd-5I/AAAAAAAAAbs/j-Cz4T4YvIw/s160-c/Leica%mm%252520Summilux.jpg&,
&/-qSJ4D4iXzGo/URquyDWiJ1I/AAAAAAAAAbs/k2pBXeWehOA/s160-c/Leica%mm%252520Summilux.jpg&,
&/-dwlPg83vzLg/URquylTVuFI/AAAAAAAAAbs/G6SyQ8b4YsI/s160-c/Leica%%528Front%252529.jpg&,
&/-R3_EYAyJvfk/URquzQBv8eI/AAAAAAAAAbs/b9xhpUM3pEI/s160-c/Light%252520to%252520Sand.jpg&,
&/-fHY5h67QPi0/URqu0Cp4J1I/AAAAAAAAAbs/0lG6m94Z6vM/s160-c/Little%252520Bit%252520of%252520Paradise.jpg&,
&/-TzF_LwrCnRM/URqu0RddPOI/AAAAAAAAAbs/gaj2dLiuX0s/s160-c/Lone%252520Pine%252520Sunset.jpg&,
&/-4HdpJ4_DXU4/URqu046dJ9I/AAAAAAAAAbs/eBOodtk2_uk/s160-c/Lonely%252520Rock.jpg&,
&/-erbF--z-W4s/URqu1ajSLkI/AAAAAAAAAbs/xjDCDO1INzM/s160-c/Longue%252520Vue.jpg&,
&/-0CXJRdJaqvc/URqu1opNZNI/AAAAAAAAAbs/PFB2oPUU7Lk/s160-c/Look%252520Me%252520in%252520the%252520Eye.jpg&,
&/-D_5lNxnDN6g/URqu2Tk7HVI/AAAAAAAAAbs/p0ddca9W__Y/s160-c/Lost%252520in%2520Field.jpg&,
&/-flsqwMrIk2Q/URqu24PcmjI/AAAAAAAAAbs/5ocIH85XofM/s160-c/Marshall%252520Beach%252520Sunset.jpg&,
&/-Y4lgryEVTmU/URqu28kG3gI/AAAAAAAAAbs/OjXpekqtbJ4/s160-c/Mono%252520Lake%252520Blue.jpg&,
&/-AaHAJPmcGYA/URqu3PIldHI/AAAAAAAAAbs/lcTqk1SIcRs/s160-c/Monument%252520Valley%252520Overlook.jpg&,
&/-vKxfdQ83dQA/URqu31Yq_BI/AAAAAAAAAbs/OUoGk_2AyfM/s160-c/Moving%252520Rock.jpg&,
&/-CG62QiPpWXg/URqu4ia4vRI/AAAAAAAAAbs/0YOdqLAlcAc/s160-c/Napali%252520Coast.jpg&,
&/-wdGrP5PMmJQ/URqu5PZvn7I/AAAAAAAAAbs/m0abEcdPXe4/s160-c/One%252520Wheel.jpg&,
&/-6WS5DoCGuOA/URqu5qx1UgI/AAAAAAAAAbs/giMw2ixPvrY/s160-c/Open%252520Sky.jpg&,
&/-u8EHKj8G8GQ/URqu55sM6yI/AAAAAAAAAbs/lIXX_GlTdmI/s160-c/Orange%252520Sunset.jpg&,
&/-74Z5qj4bTDE/URqu6LSrJrI/AAAAAAAAAbs/XzmVkw90szQ/s160-c/Orchid.jpg&,
&/-lEQE4h6TePE/URqu6t_lSkI/AAAAAAAAAbs/zvGYKOea_qY/s160-c/Over%252520there.jpg&,
&/-cauH-53JH2M/URqu66v_USI/AAAAAAAAAbs/EucwwqclfKQ/s160-c/Plumes.jpg&,
&/-eDLT2jHDoy4/URqu7axzkAI/AAAAAAAAAbs/iVZE-xJ7lZs/s160-c/Rainbokeh.jpg&,
&/-j1NLqEFIyco/URqu8L1CGcI/AAAAAAAAAbs/aqZkgX66zlI/s160-c/Rainbow.jpg&,
&/-DRnqmK0t4VU/URqu8XYN9yI/AAAAAAAAAbs/LgvF_592WLU/s160-c/Rice%252520Fields.jpg&,
&/-hwh1v3EOGcQ/URqu8qOaKwI/AAAAAAAAAbs/IljRJRnbJGw/s160-c/Rockaway%252520Fire%252520Sky.jpg&,
&/-wjV6FQk7tlk/URqu9jCQ8sI/AAAAAAAAAbs/RyYUpdo-c9o/s160-c/Rockaway%252520Flow.jpg&,
&/-6cAXNfo7D20/URqu-BdzgPI/AAAAAAAAAbs/OmsYllzJqwo/s160-c/Rockaway%252520Sunset%252520Sky.jpg&,
&/-sl8fpGPS-RE/URqu_BOkfgI/AAAAAAAAAbs/Dg2Fv-JxOeg/s160-c/Russian%252520Ridge%252520Sunset.jpg&,
&/-gVtY36mMBIg/URqu_q91lkI/AAAAAAAAAbs/3CiFMBcy5MA/s160-c/Rust%252520Knot.jpg&,
&/-GHeImuHqJBE/URqu_FKfVLI/AAAAAAAAAbs/axuEJeqam7Q/s160-c/Sailing%252520Stones.jpg&,
&/-hBbYZjTOwGc/URqu_ycpIrI/AAAAAAAAAbs/nAdJUXnGJYE/s160-c/Seahorse.jpg&,
&/-Iwi6-i6IexY/URqvAYZHsVI/AAAAAAAAAbs/5ETWl4qXsFE/s160-c/Shinjuku%252520Street.jpg&,
&/-amhnySTM_MY/URqvAlb5KoI/AAAAAAAAAbs/pFCFgzlKsn0/s160-c/Sierra%252520Heavens.jpg&,
&/-dJgjepFrYSo/URqvBVJZrAI/AAAAAAAAAbs/v-F5QWpYO6s/s160-c/Sierra%252520Sunset.jpg&,
&/-Z4zGiC5nWdc/URqvBdEwivI/AAAAAAAAAbs/ZRZR1VJ84QA/s160-c/Sin%252520Lights.jpg&,
&/-_0cYiWW8ccY/URqvBz3iM4I/AAAAAAAAAbs/9N_Wq8MhLTY/s160-c/Starry%252520Lake.jpg&,
&/-A9LMoRyuQUA/URqvCYx_JoI/AAAAAAAAAbs/s7sde1Bz9cI/s160-c/Starry%252520Night.jpg&,
&/-KtLJ3k858eY/URqvC_2h_bI/AAAAAAAAAbs/zzEBImwDA_g/s160-c/Stream.jpg&,
&/-dFB7Lad6RcA/URqvDUftwWI/AAAAAAAAAbs/BrhoUtXTN7o/s160-c/Strip%252520Sunset.jpg&,
&/-at6apgFiN20/URqvDyffUZI/AAAAAAAAAbs/clABCx171bE/s160-c/Sunset%252520Hills.jpg&,
&/-7-EHhtQthII/URqvEYTk4vI/AAAAAAAAAbs/QSJZoB3YjVg/s160-c/Tenaya%252520Lake%2525202.jpg&,
&/-8MrjV_a-Pok/URqvFC5repI/AAAAAAAAAbs/9inKTg9fbCE/s160-c/Tenaya%252520Lake.jpg&,
&/-B1HW-z4zwao/URqvFWYRwUI/AAAAAAAAAbs/8Peli53Bs8I/s160-c/The%252520Cave%252520BW.jpg&,
&/-PO4E-xZKAnQ/URqvGRqjYkI/AAAAAAAAAbs/42nyADFsXag/s160-c/The%252520Fisherman.jpg&,
&/-iLyZlzfdy7s/URqvG0YScdI/AAAAAAAAAbs/1J9eDKmkXtk/s160-c/The%252520Night%252520is%252520Coming.jpg&,
&/-G-k7YkkUco0/URqvHhah6fI/AAAAAAAAAbs/_taQQG7t0vo/s160-c/The%252520Road.jpg&,
&/-h-ALJt7kSus/URqvIThqYfI/AAAAAAAAAbs/ejiv35olWS8/s160-c/Tokyo%252520Heights.jpg&,
&/-Hy9k-TbS7xg/URqvIjQMOxI/AAAAAAAAAbs/RSpmmOATSkg/s160-c/Tokyo%252520Highway.jpg&,
&/-83oOvMb4OZs/URqvJL0T7lI/AAAAAAAAAbs/c5TECZ6RONM/s160-c/Tokyo%252520Smog.jpg&,
&/-FB-jfgREEfI/URqvJI3EXAI/AAAAAAAAAbs/XfyweiRF4v8/s160-c/Tufa%252520at%252520Night.jpg&,
&/-vngKD5Z1U8w/URqvJUCEgPI/AAAAAAAAAbs/ulxCMVcU6EU/s160-c/Valley%252520Sunset.jpg&,
&/-DOz5I2E2oMQ/URqvKMND1kI/AAAAAAAAAbs/Iqf0IsInleo/s160-c/Windmill%252520Sunrise.jpg&,
&/-biyiyWcJ9MU/URqvKculiAI/AAAAAAAAAbs/jyPsCplJOpE/s160-c/Windmill.jpg&,
&/-PDT167_xRdA/URqvK36mLcI/AAAAAAAAAbs/oi2ik9QseMI/s160-c/Windmills.jpg&,
&/-kI_QdYx7VlU/URqvLXCB6gI/AAAAAAAAAbs/N31vlZ6u89o/s160-c/Yet%252520Another%252520Rockaway%252520Sunset.jpg&,
&/-e9NHZ5k5MSs/URqvMIBZjtI/AAAAAAAAAbs/1fV810rDNfQ/s160-c/Yosemite%252520Tree.jpg&, };
}package com.example.
import java.io.IOE
import java.net.HttpURLC
import java.net.URL;
import java.util.concurrent.ExecutorS
import java.util.concurrent.E
import android.content.C
import android.graphics.B
import android.graphics.BitmapF
import android.os.H
import android.os.M
import android.support.v4.util.LruC
public class ImageDownLoader {
* 缓存Image的类，当存储Image的大小大于LruCache设定的值，系统自动释放内存
private LruCache&String, Bitmap& mMemoryC
* 操作文件相关类对象的引用
private FileUtils fileU
* 下载Image的线程池
private ExecutorService mImageThreadPool =
public ImageDownLoader(Context context){
//获取系统分配给每个应用程序的最大内存，每个应用系统分配32M
int maxMemory = (int) Runtime.getRuntime().maxMemory();
int mCacheSize = maxMemory / 8;
//给LruCache分配1/8 4M
mMemoryCache = new LruCache&String, Bitmap&(mCacheSize){
//必须重写此方法，来测量Bitmap的大小
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight();
fileUtils = new FileUtils(context);
* 获取线程池的方法，因为涉及到并发的问题，我们加上同步锁
public ExecutorService getThreadPool(){
if(mImageThreadPool == null){
synchronized(ExecutorService.class){
if(mImageThreadPool == null){
//为了下载图片更加的流畅，我们用了2个线程来下载图片
mImageThreadPool = Executors.newFixedThreadPool(2);
return mImageThreadP
* 添加Bitmap到内存缓存
* @param key
* @param bitmap
public void addBitmapToMemoryCache(String key, Bitmap bitmap) {
if (getBitmapFromMemCache(key) == null && bitmap != null) {
mMemoryCache.put(key, bitmap);
* 从内存缓存中获取一个Bitmap
* @param key
public Bitmap getBitmapFromMemCache(String key) {
return mMemoryCache.get(key);
* 先从内存缓存中获取Bitmap,如果没有就从SD卡或者手机缓存中获取，SD卡或者手机缓存
* 没有就去下载
* @param url
* @param listener
public Bitmap downloadImage(final String url, final onImageLoaderListener listener){
//替换Url中非字母和非数字的字符，这里比较重要，因为我们用Url作为文件名，比如我们的Url
//是Http://xiaanming/abc.用这个作为图片名称，系统会认为xiaanming为一个目录，
//我们没有创建此目录保存文件就会报错
final String subUrl = url.replaceAll(&[^\\w]&, &&);
Bitmap bitmap = showCacheBitmap(subUrl);
if(bitmap != null){
final Handler handler = new Handler(){
public void handleMessage(Message msg) {
super.handleMessage(msg);
listener.onImageLoader((Bitmap)msg.obj, url);
getThreadPool().execute(new Runnable() {
public void run() {
Bitmap bitmap = getBitmapFormUrl(url);
Message msg = handler.obtainMessage();
handler.sendMessage(msg);
//保存在SD卡或者手机目录
fileUtils.savaBitmap(subUrl, bitmap);
} catch (IOException e) {
e.printStackTrace();
//将Bitmap 加入内存缓存
addBitmapToMemoryCache(subUrl, bitmap);
* 获取Bitmap, 内存中没有就去手机或者sd卡中获取，这一步在getView中会调用，比较关键的一步
* @param url
public Bitmap showCacheBitmap(String url){
if(getBitmapFromMemCache(url) != null){
return getBitmapFromMemCache(url);
}else if(fileUtils.isFileExists(url) && fileUtils.getFileSize(url) != 0){
//从SD卡获取手机里面获取Bitmap
Bitmap bitmap = fileUtils.getBitmap(url);
//将Bitmap 加入内存缓存
addBitmapToMemoryCache(url, bitmap);
* 从Url中获取Bitmap
* @param url
private Bitmap getBitmapFormUrl(String url) {
Bitmap bitmap =
HttpURLConnection con =
URL mImageUrl = new URL(url);
con = (HttpURLConnection) mImageUrl.openConnection();
con.setConnectTimeout(10 * 1000);
con.setReadTimeout(10 * 1000);
con.setDoInput(true);
con.setDoOutput(true);
bitmap = BitmapFactory.decodeStream(con.getInputStream());
} catch (Exception e) {
e.printStackTrace();
} finally {
if (con != null) {
con.disconnect();
* 取消正在下载的任务
public synchronized void cancelTask() {
if(mImageThreadPool != null){
mImageThreadPool.shutdownNow();
mImageThreadPool =
* 异步下载图片的回调接口
* @author len
public interface onImageLoaderListener{
void onImageLoader(Bitmap bitmap, String url);
package com.example.
import android.content.C
import android.graphics.B
import android.view.V
import android.view.ViewG
import android.widget.AbsListV
import android.widget.AbsListView.OnScrollL
import android.widget.BaseA
import android.widget.GridV
import android.widget.ImageV
import com.example.asyncimageloader.ImageDownLoader.onImageLoaderL
public class ImageAdapter extends BaseAdapter implements OnScrollListener{
* 上下文对象的引用
* Image Url的数组
private String [] imageThumbU
* GridView对象的应用
private GridView mGridV
* Image 下载器
private ImageDownLoader mImageDownL
* 记录是否刚打开程序，用于解决进入程序不滚动屏幕，不会下载图片的问题。
* 参考http://blog.csdn.net/guolin_blog/article/details/9526203#comments
private boolean isFirstEnter =
* 一屏中第一个item的位置
private int mFirstVisibleI
* 一屏中所有item的个数
private int mVisibleItemC
public ImageAdapter(Context context, GridView mGridView, String [] imageThumbUrls){
this.context =
this.mGridView = mGridV
this.imageThumbUrls = imageThumbU
mImageDownLoader = new ImageDownLoader(context);
mGridView.setOnScrollListener(this);
public void onScrollStateChanged(AbsListView view, int scrollState) {
//仅当GridView静止时才去下载图片，GridView滑动时取消所有正在下载的任务
if(scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE){
showImage(mFirstVisibleItem, mVisibleItemCount);
cancelTask();
* GridView滚动的时候调用的方法，刚开始显示GridView也会调用此方法
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
mFirstVisibleItem = firstVisibleI
mVisibleItemCount = visibleItemC
// 因此在这里为首次进入程序开启下载任务。
if(isFirstEnter && visibleItemCount & 0){
showImage(mFirstVisibleItem, mVisibleItemCount);
isFirstEnter =
public int getCount() {
return imageThumbUrls.
public Object getItem(int position) {
return imageThumbUrls[position];
public long getItemId(int position) {
public View getView(int position, View convertView, ViewGroup parent) {
ImageView mImageV
final String mImageUrl = imageThumbUrls[position];
if(convertView == null){
mImageView = new ImageView(context);
mImageView = (ImageView) convertV
mImageView.setLayoutParams(new GridView.LayoutParams(150, 150));
mImageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
//给ImageView设置Tag,这里已经是司空见惯了
mImageView.setTag(mImageUrl);
/*******************************去掉下面这几行试试是什么效果****************************/
Bitmap bitmap = mImageDownLoader.showCacheBitmap(mImageUrl.replaceAll(&[^\\w]&, &&));
if(bitmap != null){
mImageView.setImageBitmap(bitmap);
mImageView.setImageDrawable(context.getResources().getDrawable(R.drawable.ic_empty));
/**********************************************************************************/
return mImageV
* 显示当前屏幕的图片，先会去查找LruCache，LruCache没有就去sd卡或者手机目录查找，在没有就开启线程去下载
* @param firstVisibleItem
* @param visibleItemCount
private void showImage(int firstVisibleItem, int visibleItemCount){
Bitmap bitmap =
for(int i=firstVisibleI i&firstVisibleItem + visibleItemC i++){
String mImageUrl = imageThumbUrls[i];
final ImageView mImageView = (ImageView) mGridView.findViewWithTag(mImageUrl);
bitmap = mImageDownLoader.downloadImage(mImageUrl, new onImageLoaderListener() {
public void onImageLoader(Bitmap bitmap, String url) {
if(mImageView != null && bitmap != null){
mImageView.setImageBitmap(bitmap);
//if(bitmap != null){
// mImageView.setImageBitmap(bitmap);
// mImageView.setImageDrawable(context.getResources().getDrawable(R.drawable.ic_empty));
* 取消下载任务
public void cancelTask(){
mImageDownLoader.cancelTask();
package com.example.
import android.app.A
import android.os.B
import android.view.M
import android.view.MenuI
import android.widget.GridV
import android.widget.T
public class MainActivity extends Activity {
private GridView mGridV
private String [] imageThumbUrls = Images.imageThumbU
private ImageAdapter mImageA
private FileUtils fileU
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fileUtils = new FileUtils(this);
mGridView = (GridView) findViewById(R.id.gridView);
mImageAdapter = new ImageAdapter(this, mGridView, imageThumbUrls);
mGridView.setAdapter(mImageAdapter);
protected void onDestroy() {
mImageAdapter.cancelTask();
super.onDestroy();
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(&删除手机中图片缓存&);
return super.onCreateOptionsMenu(menu);
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
fileUtils.deleteFile();
Toast.makeText(getApplication(), &清空缓存成功&, Toast.LENGTH_SHORT).show();
return super.onOptionsItemSelected(item);
}&RelativeLayout xmlns:android=&/apk/res/android&
xmlns:tools=&/tools&
android:layout_width=&match_parent&
android:layout_height=&match_parent&
tools:context=&.MainActivity& &
android:id=&@+id/gridView&
android:layout_width=&match_parent&
android:layout_height=&match_parent&
android:stretchMode=&columnWidth&
android:columnWidth=&90dip&
android:verticalSpacing=&10dip&
android:horizontalSpacing=&10dip&
android:cacheColorHint=&@android:color/transparent&
android:numColumns=&auto_fit& &
&/GridView&
&/RelativeLayout&&uses-permission android:name=&android.permission.INTERNET& /&
&uses-permission android:name=&android.permission.WRITE_EXTERNAL_STORAGE& /& &&
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