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POUse AsyncTask to Load Bitmap Images
 

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  1. POUse AsyncTask to Load Bitmap Images
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    <p>I am trying to load an image in the background as someone works through my app. The logic I wrote is this: </p> <pre><code>public class ImageLoader extends AsyncTask &lt;Context, Void, Bitmap&gt;{ private String URL; private int type; ImageLoader(String Url, int Type) { URL = Url; type = Type; } @Override protected Bitmap doInBackground(Context... arg0) { AssetManager assetMgr = arg0[0].getAssets(); Bitmap bitmap = null; try { bitmap = BitmapFactory.decodeStream(assetMgr.open(URL)); } catch (IOException e) { e.printStackTrace(); } return bitmap; } @Override protected void onPostExecute( Bitmap result ) { super.onPostExecute(result); if (type == 1) Inst1 = result; else if (type == 2) Inst2 = result; else if (type == 3) Inst3 = result; } } </code></pre> <p>However when I try to start a new thread like this: </p> <pre><code>task = new ImageLoader("Instructions_2.png", 3); task.execute(gameContext); </code></pre> <p>But within the program I get the error Looper.prepare must be called, followed by the logic looper.quit()</p> <p>However I seem to break the program when I add Looper.prepare(), and there is no looper.quit() to call.</p> <p>Am I creating the task correctly?</p> <blockquote> <p>EDIT:</p> </blockquote> <p>This is the error log from when I try to run: </p> <pre><code>task = new ImageLoader(gameContext, "Instructions_3.png", 3); </code></pre> <p>I have a switch case statement that I put the image loader declaration outside of. Essentially my code is:</p> <pre><code>ImageLoader task; switch(foo) { case 0: ... task = new ImageLoader(gameContext, "Instructions_0.png", 3); task.execute(); break; case 1: ... task = new ImageLoader(gameContext, "Instructions_1.png", 3)); task.execute(); break; ... } </code></pre> <p>And the error log (error occurs every time I hit the <code>task = new ImageLoader(...);</code> line</p> <pre><code>07-20 14:23:34.276: E/AndroidRuntime(16741): FATAL EXCEPTION: Thread-10 07-20 14:23:34.276: E/AndroidRuntime(16741): java.lang.ExceptionInInitializerError 07-20 14:23:34.276: E/AndroidRuntime(16741): at com.petronicarts.stormthecastle.MainGamePanel.update(MainGamePanel.java:2578) 07-20 14:23:34.276: E/AndroidRuntime(16741): at com.petronicarts.stormthecastle.MainThread.run(MainThread.java:63) 07-20 14:23:34.276: E/AndroidRuntime(16741): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 07-20 14:23:34.276: E/AndroidRuntime(16741): at android.os.Handler.&lt;init&gt;(Handler.java:121) 07-20 14:23:34.276: E/AndroidRuntime(16741): at android.os.AsyncTask$InternalHandler.&lt;init&gt;(AsyncTask.java:421) 07-20 14:23:34.276: E/AndroidRuntime(16741): at android.os.AsyncTask$InternalHandler.&lt;init&gt;(AsyncTask.java:421) 07-20 14:23:34.276: E/AndroidRuntime(16741): at android.os.AsyncTask.&lt;clinit&gt;(AsyncTask.java:152) 07-20 14:23:34.276: E/AndroidRuntime(16741): ... 2 more </code></pre>
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