Android Development's method of loading pictures _android

An example of this article describes the Android development method for loading pictures. Share to everyone for your reference. The specific analysis is as follows:

Loading a picture on a network requires the ability to configure access to the network in manifest, as follows:

<uses-permission android:name= "Android.permission.INTERNET"/>

If you do not configure this permission, it will error: Unknown host exception.

Package com.example.loadimgfromweb; 
Import Java.io.InputStream; 
Import android.app.Activity; 
Import Android.graphics.Bitmap; 
Import Android.graphics.BitmapFactory; 
Import Android.os.AsyncTask; 
Import Android.os.Bundle; 
Import Android.view.Menu; 
Import Android.widget.ImageView; public class Mainactivity extends activity {@Override protected void onCreate (Bundle savedinstancestate) {sup 
    Er.oncreate (savedinstancestate); 
    Setcontentview (R.layout.activity_main); 
    ImageView v = (imageview) Findviewbyid (R.ID.IMAGEVIEW1); 
    String url = "Yun_qi_img/134970028_200x150.jpg"; 
  New Downloadimage (v). Execute (URL); @Override public boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu; the adds items to the action 
    Bar if it is present. 
    Getmenuinflater (). Inflate (R.menu.activity_main, menu); 
  return true; 
    public class Downloadimage extends Asynctask<string, Void, bitmap> {ImageView imageview; Public DownloadimaGE (ImageView imageview) {this.imageview = ImageView; 
      } @Override protected Bitmap doinbackground (String ... urls) {string url = urls[0]; 
      Bitmap tmpbitmap = null; 
        try {InputStream is = new Java.net.URL (URL). OpenStream (); 
      Tmpbitmap = Bitmapfactory.decodestream (IS); 
      catch (Exception e) {e.printstacktrace (); 
    return tmpbitmap; 
    @Override protected void OnPostExecute (Bitmap result) {Imageview.setimagebitmap (result);

 } 
  } 
}

The above example uses the Asynctask to interact with the front-end user interface. Avoid loading time too long, affect interface interaction.

If you are loading a local picture, go directly to:

ImageView v = (imageview) Findviewbyid (r.id.imageview1); 
    V.setimageresource (R.drawable.apic); 

You can save your pictures locally by using Asynctask to load the pictures:

@Override 
protected Bitmap doinbackground (String ... urls) { 
  string url = urls[0]; 
  Bitmap tmpbitmap = null; 
  try { 
 InputStream is = new Java.net.URL (URL). OpenStream (); 
 URL u = new url (URL); 
 HttpURLConnection conn = (httpurlconnection) u.openconnection ();
 Bitmap Bitmap = Bitmapfactory.decodestream (is); 
 Determine if there is a memory card 
 if (Environment.getexternalstoragestate (). Equals ( 
 environment.media_mounted)) {
   // Save picture to local 
   File Sdcarddir = Environment.getexternalstoragedirectory ();
   String fileName = "a.jpg"; 
   String FilePath = Sdcarddir + "/" + FileName; 
   FileOutputStream fos = new FileOutputStream (filePath); 
   Bitmap.compress (Bitmap.CompressFormat.PNG, FOS); 
 Close Flow 
 is.close (); 
 Conn.disconnect (); 
 return bitmap; 
  } catch (Exception e) { 
 e.printstacktrace (); 
  } 
  return tmpbitmap; 
} 

I hope this article will help you with your Android program.