How to display the image from database in android imageview -
hi in application getting json response in image there.that image want display in android imageview.in image want set imageview.
picture":"547150_156322317826149_1332901104_n.jpg
can 1 me
well, suppose got picture url, suggest try code: create simple imageview in main.xml file:
main.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="fill_parent" android:orientation="vertical" > <textview android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="loading image url" android:layout_margin="10dip" /> <imageview android:id="@+id/image" android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_margin="10dip"/> </linearlayout> open main activity , type following code. whenever wan’t show image url call following code:
androidloadimagefromurlactivity.java:
package com.androidhive.imagefromurl; import android.app.activity; import android.os.bundle; import android.widget.imageview; public class androidloadimagefromurlactivity extends activity { @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); // loader image - shown before loading image int loader = r.drawable.loader; // imageview show imageview image = (imageview) findviewbyid(r.id.image); // image url string image_url = "http://url of image here"; // imageloader class instance imageloader imgloader = new imageloader(getapplicationcontext()); // whenever want load image url // call displayimage function // url - image url load // loader - loader image, displayed before getting image // image - imageview imgloader.displayimage(image_url, loader, image); } } add following classes in project , run project:
imageloader.java
package com.androidhive.imagefromurl; import java.io.file; import java.io.fileinputstream; import java.io.filenotfoundexception; import java.io.fileoutputstream; import java.io.inputstream; import java.io.outputstream; import java.net.httpurlconnection; import java.net.url; import java.util.collections; import java.util.map; import java.util.weakhashmap; import java.util.concurrent.executorservice; import java.util.concurrent.executors; import android.app.activity; import android.content.context; import android.graphics.bitmap; import android.graphics.bitmapfactory; import android.widget.imageview; public class imageloader { memorycache memorycache=new memorycache(); filecache filecache; private map<imageview, string> imageviews=collections.synchronizedmap(new weakhashmap<imageview, string>()); executorservice executorservice; public imageloader(context context){ filecache=new filecache(context); executorservice=executors.newfixedthreadpool(5); } int stub_id = r.drawable.ic_launcher; public void displayimage(string url, int loader, imageview imageview) { stub_id = loader; imageviews.put(imageview, url); bitmap bitmap=memorycache.get(url); if(bitmap!=null) imageview.setimagebitmap(bitmap); else { queuephoto(url, imageview); imageview.setimageresource(loader); } } private void queuephoto(string url, imageview imageview) { phototoload p=new phototoload(url, imageview); executorservice.submit(new photosloader(p)); } private bitmap getbitmap(string url) { file f=filecache.getfile(url); //from sd cache bitmap b = decodefile(f); if(b!=null) return b; //from web try { bitmap bitmap=null; url imageurl = new url(url); httpurlconnection conn = (httpurlconnection)imageurl.openconnection(); conn.setconnecttimeout(30000); conn.setreadtimeout(30000); conn.setinstancefollowredirects(true); inputstream is=conn.getinputstream(); outputstream os = new fileoutputstream(f); utils.copystream(is, os); os.close(); bitmap = decodefile(f); return bitmap; } catch (exception ex){ ex.printstacktrace(); return null; } } //decodes image , scales reduce memory consumption private bitmap decodefile(file f){ try { //decode image size bitmapfactory.options o = new bitmapfactory.options(); o.injustdecodebounds = true; bitmapfactory.decodestream(new fileinputstream(f),null,o); //find correct scale value. should power of 2. final int required_size=70; int width_tmp=o.outwidth, height_tmp=o.outheight; int scale=1; while(true){ if(width_tmp/2<required_size || height_tmp/2<required_size) break; width_tmp/=2; height_tmp/=2; scale*=2; } //decode insamplesize bitmapfactory.options o2 = new bitmapfactory.options(); o2.insamplesize=scale; return bitmapfactory.decodestream(new fileinputstream(f), null, o2); } catch (filenotfoundexception e) {} return null; } //task queue private class phototoload { public string url; public imageview imageview; public phototoload(string u, imageview i){ url=u; imageview=i; } } class photosloader implements runnable { phototoload phototoload; photosloader(phototoload phototoload){ this.phototoload=phototoload; } @override public void run() { if(imageviewreused(phototoload)) return; bitmap bmp=getbitmap(phototoload.url); memorycache.put(phototoload.url, bmp); if(imageviewreused(phototoload)) return; bitmapdisplayer bd=new bitmapdisplayer(bmp, phototoload); activity a=(activity)phototoload.imageview.getcontext(); a.runonuithread(bd); } } boolean imageviewreused(phototoload phototoload){ string tag=imageviews.get(phototoload.imageview); if(tag==null || !tag.equals(phototoload.url)) return true; return false; } //used display bitmap in ui thread class bitmapdisplayer implements runnable { bitmap bitmap; phototoload phototoload; public bitmapdisplayer(bitmap b, phototoload p){bitmap=b;phototoload=p;} public void run() { if(imageviewreused(phototoload)) return; if(bitmap!=null) phototoload.imageview.setimagebitmap(bitmap); else phototoload.imageview.setimageresource(stub_id); } } public void clearcache() { memorycache.clear(); filecache.clear(); } } filecache.java
package com.androidhive.imagefromurl; import java.io.file; import android.content.context; public class filecache { private file cachedir; public filecache(context context){ //find dir save cached images if (android.os.environment.getexternalstoragestate().equals(android.os.environment.media_mounted)) cachedir=new file(android.os.environment.getexternalstoragedirectory(),"tempimages"); else cachedir=context.getcachedir(); if(!cachedir.exists()) cachedir.mkdirs(); } public file getfile(string url){ string filename=string.valueof(url.hashcode()); file f = new file(cachedir, filename); return f; } public void clear(){ file[] files=cachedir.listfiles(); if(files==null) return; for(file f:files) f.delete(); } } memorycache.java
package com.androidhive.imagefromurl; import java.lang.ref.softreference; import java.util.collections; import java.util.hashmap; import java.util.map; import android.graphics.bitmap; public class memorycache { private map<string, softreference<bitmap>> cache=collections.synchronizedmap(new hashmap<string, softreference<bitmap>>()); public bitmap get(string id){ if(!cache.containskey(id)) return null; softreference<bitmap> ref=cache.get(id); return ref.get(); } public void put(string id, bitmap bitmap){ cache.put(id, new softreference<bitmap>(bitmap)); } public void clear() { cache.clear(); } } utils.java
package com.androidhive.imagefromurl; import java.io.inputstream; import java.io.outputstream; public class utils { public static void copystream(inputstream is, outputstream os) { final int buffer_size=1024; try { byte[] bytes=new byte[buffer_size]; for(;;) { int count=is.read(bytes, 0, buffer_size); if(count==-1) break; os.write(bytes, 0, count); } } catch(exception ex){} } } i hope you, best regards
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