android cache viewer

I plan to write a series of articles on the cache mechanism of android. At present, some topics are still in the outline stage. Please complete them slowly. 1 Android focus When a new focus is found in the Node List, check and find that if you are a sibling with yourself, push it to the stack. When all the siblings are found, in other words, the last child of the

Android AdapterView clears the cache view method, androidadapterview AdapterView. SetAdapter (null ); AdapterView. SetAdapter (mAdapter ); You can. Android AdapterView In fact, you will find that the parameter of this method is such AdapterView. How to determine the View in the Click Event in Android (1) bind the

public class MemoryCache { private static final String TAG = "MemoryCache";Private mapNew linkedhashmapPrivate long size=0;//current Allocated sizePrivate long Limit=1000000;//max memory in bytes Public MemoryCache () {Use 25% of available heap sizeSetlimit (Runtime.getruntime (). MaxMemory ()/4);} public void Setlimit (long new_limit) {Limit=new_limit;LOG.I (TAG, "MemoryCache would use the up to" +limit/1024./1024.+ "MB");} Public Bitmap get (String ID) {try{if (!cache.containskey (ID))return n

Android apps now account for a larger memory than one, and the quality of Android programs needs to be improved.Here is a brief description of the network image cache, my side of the simple talk about ideas1: Network pictures, undoubtedly need to download pictures, we do not need to download each time.Maintain a table, the table contains the URL corresponding to

Why to Cache Pictures:(1) According to the specific device of the different Android system for each application allocated a fixed memory space supply use;(2) The picture is a very memory resource file, if loading a picture in the interface is good to say, if you want to load a large number of pictures will exceed the system for the application allocated to the space of the oom abnormal, so that the program

Well, go straight to the theme, cache.Where references are needed:Acache cache =NULL; Private voidgetacachelibrary () {Cache= Acache.Get(Mainactivity. This); Bitmap Bitmap= Cache.getasbitmap ("Image"); if(NULL!=bitmap) {System. out. println ("no bitmap"); } Else{System. out. println ("Have bitmap"); } }And then every time I resume:Cache.put ("image", R.drawable.ic_launcher);These are just examples. Refer

In the picture loading library Bad Street today, choose a suitable for their own use of the image loading library has become a necessary step for every Android developer. Now the well-known picture loading library in the market has Uil,picasso,volley Imageloader,fresco and our protagonist today glide. They are not the same, they can not judge who is better than who, can only say which is more suitable for you. I understand.Let me talk about the person

Android saves the data in the ListView by saving it to the cache. For such data: 77f265bb46de068e78f35afbadec62af 3 0 1195224593 3436952795 5 xtaJR 3436952795 0 0 5 xtaJR Ma yanli Http://tp2.sinaimg.cn/1195224593/50/5614100014/0 1 0

Android problem summary: (1) the use and cache mechanism of ViewPager in June 1.41. Implement lazy page loading for ViewPager;In some cases, for example, if you use ViewPager to view multiple large charts, multiple images cannot be loaded at a time. The specific content of the page (or pre-loaded on the next page) is only loaded when you browse the page.2. Control the number of pages cached by ViewPager.Com

Android.content.DialogInterface; Import android.content.Intent; Import Android.content.pm.IPackageStatsObserver; Import Android.content.pm.PackageManager; Import Android.content.pm.PackageStats; Import Android.content.pm.ResolveInfo; Import android.graphics.drawable.Drawable; Import Android.os.Bundle; Import android.os.RemoteException; Import Android.text.format.Formatter; Import Android.util.Log; Import Android.view.LayoutInflater; Import Android.view.View; Import Android.widget.AdapterView; I

1, priority SD card, otherwise dataFile Cachedir; //prevent the phone from having an SD card, or the SD is just being removed if(Environment.MEDIA_MOUNTED.equals (Environment. Getexternalstoragestate ())|| !environment.isexternalstorageremovable ()) { //New file (file dir, String name), a name folder is created in Dir's directory and returned//the path to the Getexternalcachedir is/sdcard/android/data///Package>/cacheCachedir =NewFil

in the picture loading library Bad Street today, choose a suitable for their own use of the image loading library has become a necessary step for every Android developer. Now the famous picture loading library in the market has UIL,Picasso, Volley Imageloader,Fresco and our protagonist today Glide . They are not the same, they can not judge who is better than who, can only say which is more suitable for you. I understand.Let me talk about the persona

Android loads network images and retains the cache. Click to open them at any time. Today, I need to write a class that retains the network image cache. I 'd like to share it with you. In fact, the implementation principle is very simple, that is, to download image data from the Internet, while converting the data into drawable and loading it to the specified im

request picture is implemented with just two lines of code.Implement Imagelistenerimagelistener Imagelistener = Imageloader.getimagelistener (Imageview,r.drawable.ic_launcher, R.drawable.ic_launcher); Request Picture settings picture Volleyhttprequest.image_loader (URL, imagelistener);6.2 Optimizing Request DataThe use of jsonobject_request;String Url=volleyhttppath.getsharedall (); Volleyhandler6.3 Demo DownloadExample--movie list optimized version download7. SummaryUsing Volley network com

(R.id.tv_text); Holder.image = (ImageView) convertview . Findviewbyid (R.ID.IV_IMG); Convertview.settag (holder); } Else { Holder = (viewholder) convertview.gettag (); } Holder.text.setText (List.get (position)); if (position% 2 = = 0) { Holder.image.setImageResource (R.drawable.ic_launcher); } Else { Holder.image.setImageResource (R.drawable.icon); } return convertview; } } /** * Use a class to save the elements in item * * @author Administrato

(String imageuri, view view, Bitmap loadedimage) {if (loadedimage! = null) {ImageView ImageView = (ImageView) view;Whether to display the first timeBoolean firstdisplay =!displayedimages.contains (Imageuri);if (Firstdisplay) {Picture fade-in effectFadeinbitmapdisplayer.animate (ImageView, 500);Displayedimages.add (Imageuri);}}}}/*** Show Pictures* Parameter 1: Image URL* Parameter 2: control to display pictures* Parameter 3: Display the picture's settings* Parameter 4: Listener*/Imageloader.dis

Findviewbyid, and optimizing performance.Once we understand how it works, we can use it over and over again, using convertview just to be free. Change the content of it.Use a ListView with a adapter, in order to make the performance more excellent. The ListView caches the line item (the corresponding view of a row). The ListView obtains the item for each line through the GetView function of the adapter.Package Com.dzt.listviewdemo;import Java.util.arraylist;import Android.app.activity;import an

) {uihelper.toastmessage (mainactivity. This, r.string.xml_parser_failed); } } }; Private voidInitData () {selectordialog.show (); NewThread () { Public voidrun () {Message msg=NewMessage (); BooleanIsrefresh =false; Try{newslist list=appcontext.getnewslist (); if(List.getnewscount () > 0) {Msg.what= 1; Msg.obj=list.getnewslist (); Appcontext.saveobject (list,"Newslist_"); } Else{msg.what=-1; } } Catch(appexception e) {e.printstacktrace (); Msg.what=-2; Msg.obj=e;

{// image size judgment operation inputstream size_is = htmltool. gethttpconnection (URL ). getinputstream (); bitmapfactory. options op = new bitmapfactory. options (); OP. injustdecodebounds = true; @ suppresswarnings ("UNUSED") bitmap Si Ze_bitmap = bitmapfactory. decodestream (size_is, null, OP); OP. injustdecodebounds = true; // only obtains width and height information, and does not load the entire image Boolean Isop = false; int size = publicvariable. topic_image_show; // set the obtaine