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PONeed Help in Downloading in Background Images in Android?
 

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  1. PONeed Help in Downloading in Background Images in Android?
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    <p>I have an image view , i had written swiping , at that time of swiping,the images are downloading from Internet, so i thought i have to download the images in the background before swiping , for that which i need to use asynctask or Service or IntentService, all these will help in downloading and storing in data/data/mypackages , but still swiping gets slow in my case any idea, also convey me which one is best one, is it i'm calling in a right way</p> <p><strong>1. asynctask</strong> </p> <p><strong>2. services</strong> </p> <p><strong>3. Intent Service</strong> as shown below, </p> <p>i m confused which one is right method because still my problem not solved</p> <p><strong>Here's asynctask code sample snippet</strong></p> <pre><code>public class Demo extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); new FirstTask().execute(); // calling Asynctask here } </code></pre> <p>}</p> <p>Async Task code</p> <pre><code>private class FirstTask extends AsyncTask&lt;Void, Void, Void&gt; { private final ProgressDialog dialog = new ProgressDialog(Catalogue.this); int temp = 0; // can use UI thread here protected void onPreExecute() { this.dialog.setMessage("Loading..."); this.dialog.setCancelable(false); //this.dialog.show(); System.gc(); Toast.makeText(Catalogue.this, "My Async Created", Toast.LENGTH_LONG).show(); } @Override protected Void doInBackground(Void... params) { Looper.prepare(); try { myddownloadmethod();// calling my download method } catch (Exception e) { Util.trace("Error in Async"+e.getMessage()); } Looper.loop(); return null; } protected void onPostExecute(Void result) { if (this.dialog.isShowing()) { Toast.makeText(Catalogue.this, "My Async destroyed", Toast.LENGTH_LONG).show(); Toast.makeText(Catalogue.this, "count" + temp, Toast.LENGTH_LONG).show(); this.dialog.dismiss(); } } } </code></pre> <p><strong>Here's My Service sinppet</strong></p> <pre><code>public class MyService extends Service implements Runnable { @Override public void onCreate() { super.onCreate(); Thread mythread = new Thread(this); mythread.start(); } public void run() { Looper.prepare(); try { myddownloadmethod();// calling my download method } catch (Exception e1) { // TODO Auto-generated catch block e1.printStackTrace(); } Looper.loop(); } @Override public IBinder onBind(Intent intent) { // TODO Auto-generated method stub return null; } } Invoking Service public class ServicesDemo extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); startService(new Intent(this, MyService.class)); } } </code></pre> <p><strong>Here's IntentService Code</strong></p> <pre><code>public class Downloader extends IntentService { public Downloader() { super("Downloader"); } @Override public void onCreate() { super.onCreate(); } @Override public void onDestroy() { super.onDestroy(); } @Override public void onHandleIntent(Intent i) { try { myddownloadmethod();// calling my download method } catch (Exception e1) { // TODO Auto-generated catch block Log.d("Error",e1.getMessage()); } } } </code></pre> <p>Calling IntentService from MyActivity</p> <pre><code>public class ServicesDemo extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Intent i1=new Intent(this, Downloader.class); startService(i1); } } </code></pre>
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    1. USHarish
    1. USSankar Ganesh
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      1. PONeed Help in Downloading in Background Images in Android?
      1. USSamuh
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      1. PONeed Help in Downloading in Background Images in Android?
      1. USJosh Lee
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      1. VTUpMod
    1. COLooper.prepare(); in doInBackground why ? looks like design flaws
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      1. PONeed Help in Downloading in Background Images in Android?
      1. USSelvin
    2. CO@selvin: i got this exception ,Can't create handler inside thread that has not called Looper.prepare() , that's why i had used
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      1. PONeed Help in Downloading in Background Images in Android?
      1. USSankar Ganesh
    3. COheh **do not use UI thread in doInBackground** ... use publishProgress and override onProgressUpdate and in this method do somtheting on UI thread ... thats how AsyncTask works ...
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      1. PONeed Help in Downloading in Background Images in Android?
      1. USSelvin
 

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