【移動(dòng)應(yīng)用開(kāi)發(fā)技術(shù)】Android-Universal-Image-Loader-master 詳解

【移動(dòng)應(yīng)用開(kāi)發(fā)技術(shù)】Android-Universal-Image-Loader-master詳解

Android-Universal-Image-Loader-master使用下載地址：/nostra13/Android-Universal-Image-Loader步驟：

1）、先要配置ImageLoaderConfiguration這個(gè)類(lèi)實(shí)現(xiàn)全局ImageLoader的實(shí)現(xiàn)情況，

可知Application中配置。

//Thisconfigurationtuningiscustom.Youcantuneeveryoption,youmaytunesomeofthem,

//oryoucancreatedefaultconfigurationby

//

ImageLoaderConfiguration.createDefault(this);

//method.

ImageLoaderConfiguration.Builderconfig=newImageLoaderConfiguration.Builder(context);

config.threadPriority(Thread.NORM_PRIORITY-2);

config.denyCacheImageMultipleSizesInMemory();

config.diskCacheFileNameGenerator(newMd5FileNameGenerator());

config.diskCacheSize(50*1024*1024);//50MiB

config.tasksProcessingOrder(QueueProcessingType.LIFO);

config.writeDebugLogs();//Removeforreleaseapp

注：更多配置項(xiàng)到ImageLoaderConfiguration.Builder中查看。

2）、初始化全局配置

//InitializeImageLoaderwithconfiguration.

ImageLoader.getInstance().init(config.build());

3）、初始化顯示圖片格式DisplayImageOptions的設(shè)置

DisplayImageOptionsoptions=newDisplayImageOptions.Builder()

.showImageOnLoading(R.drawable.ic_stub)

.showImageForEmptyUri(R.drawable.ic_empty)

.showImageOnFail(R.drawable.ic_error)

.cacheInMemory(true)

.cacheOnDisk(true)

.considerExifParams(true)

.displayer(newRoundedBitmapDisplayer(20))

.build();

4）、加載圖片到控件上

ImageLoader.getInstance().displayImage(p_w_picpathUrls[position],holder.p_w_picpath,options,null);

注：displayImage此方法有多個(gè)重載形式，根據(jù)情況選擇其一。

5）實(shí)例：

5.1）配置全局參數(shù)并初始化：

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

publicclassUILApplicationextendsApplication{

@TargetApi(Build.VERSION_CODES.GINGERBREAD)

@SuppressWarnings("unused")

@Override

publicvoidonCreate(){

if(Constants.Config.DEVELOPER_MODE&&Build.VERSION.SDK_INT>=Build.VERSION_CODES.GINGERBREAD){

StrictMode.setThreadPolicy(newStrictMode.ThreadPolicy.Builder().detectAll().penaltyDialog().build());

StrictMode.setVmPolicy(newStrictMode.VmPolicy.Builder().detectAll().penaltyDeath().build());

}

super.onCreate();

initImageLoader(getApplicationContext());

}

//初始化ImageLoader全局配置

publicstaticvoidinitImageLoader(Contextcontext){

//Thisconfigurationtuningiscustom.Youcantuneeveryoption,youmaytunesomeofthem,

//oryoucancreatedefaultconfigurationby

//

ImageLoaderConfiguration.createDefault(this);

//method.

ImageLoaderConfiguration.Builderconfig=newImageLoaderConfiguration.Builder(context);

config.threadPriority(Thread.NORM_PRIORITY-2);

config.denyCacheImageMultipleSizesInMemory();

config.diskCacheFileNameGenerator(newMd5FileNameGenerator());

config.diskCacheSize(50*1024*1024);//50MiB

config.tasksProcessingOrder(QueueProcessingType.LIFO);

config.writeDebugLogs();//Removeforreleaseapp

//InitializeImageLoaderwithconfiguration.

ImageLoader.getInstance().init(config.build());

}

}

5.2）、

publicclassMyActivityextendsActivity{

privateLayoutInflaterinflater;

privateDisplayImageOptionsoptions;

privateListViewlistView;

String[]p_w_picpathUrls=Constants.IMAGES;

@Override

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.fr_p_w_picpath_list);

inflater=LayoutInflater.from(this);

init();

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

listView.setAdapter(newMyBaseAdapter());

}

privateclassMyBaseAdapterextendsBaseAdapter{

@Override

publicintgetCount(){

returnp_w_picpathUrls.length;

}

@Override

publicObjectgetItem(intposition){

returnp_w_picpathUrls[position];

}

@Override

publiclonggetItemId(intposition){

returnposition;

}

@Override

publicViewgetView(intposition,ViewconvertView,ViewGroupparent){

Viewview=convertView;

ViewHolderholder;

if(convertView==null){

holder=newViewHolder();

view=inflater.inflate(R.layout.item_list_p_w_picpath,parent,false);

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

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

view.setTag(holder);

}else{

holder=(ViewHolder)view.getTag();

}

holder.text.setText("Item"+(position+1));

//實(shí)例化ImageLoader并加載圖片

ImageLoader.getInstance().displayImage(p_w_picpathUrls[position],holder.p_w_picpath,options,null);

returnview;

}