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POAndroid -- Why my app uses about 40MB Cached background process?
 

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    <p>I'm starting a new app with minSdkVersion="14" and targetSdkVersion="17". It contains a viewpager with 6 pages. There is 3 webviews and 3 others views. </p> <p>When i push my app to background by clicking on back or home button, it uses about 40MB in "cached background process" and i don't understand why.</p> <p>This is an example of one of my webview :</p> <pre><code>import android.os.Bundle; import android.support.v4.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.RelativeLayout; public class Presentation extends Fragment { boolean isOption = false; RelativeLayout main = null; WebView web_main = null; public Presentation () { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { super.onCreate(savedInstanceState); main = (RelativeLayout) inflater.inflate(R.layout.webview, container, false); return main; } @Override public void onActivityCreated(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onActivityCreated(savedInstanceState); web_main = new WebView(getActivity().getApplicationContext()); web_main.setWebViewClient(new WebViewClient()); web_main.getSettings().setAppCacheEnabled(false); web_main.loadUrl("file:///android_asset/main.html"); main.removeAllViews(); main.addView(web_main); } @Override public void onDestroy() { super.onDestroy(); Log.i(getClass().getName(), "[OnDestroy]"); main.removeAllViews(); web_main.destroy(); main = null; web_main = null; System.gc(); } } </code></pre> <p>I followed several tutorials and answers but there are no effect on cached background process This is my main activity : </p> <pre><code>public class AppTest extends FragmentActivity { /** * The {@link android.support.v4.view.PagerAdapter} that will provide * fragments for each of the sections. We use a * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which * will keep every loaded fragment in memory. If this becomes too memory * intensive, it may be best to switch to a * {@link android.support.v4.app.FragmentStatePagerAdapter}. */ SectionsPagerAdapter mSectionsPagerAdapter; /** * The {@link ViewPager} that will host the section contents. */ ViewPager mViewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main_content); // Create the adapter that will return a fragment for each of the three // primary sections of the app. mSectionsPagerAdapter = new SectionsPagerAdapter( getSupportFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.pager); mViewPager.setAdapter(mSectionsPagerAdapter); } @Override protected void onStop() { super.onStop(); System.gc(); Log.i(getClass().getName(), "[OnStop]"); android.os.Debug.stopMethodTracing(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main_content, menu); return true; } @Override protected void onDestroy() { super.onDestroy(); mViewPager.removeAllViews(); Log.i(getClass().getName(), "[OnDestroy]"); } /** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to * one of the sections/tabs/pages. */ public class SectionsPagerAdapter extends FragmentStatePagerAdapter { public SectionsPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { // getItem is called to instantiate the fragment for the given page. // Return a DummySectionFragment (defined as a static inner class // below) with the page number as its lone argument. Fragment fragment = null; switch (position) { case 0: fragment = new Presentation(); break; /* case 1: fragment = new Edition(); break; case 2: fragment = new Programme(); break; case 3: fragment = new Twitter(); break; case 4: fragment = new Partenaire(); break; case 5: fragment = new Information(); break;*/ default: fragment = new Presentation(); break; } return fragment; } @Override public int getCount() { // Show 6 total pages. return 6; } @Override public CharSequence getPageTitle(int position) { switch (position) { case 0: return "Presentation"; case 1: return "Edition"; case 2: return "Program"; case 3: return "Tweets"; case 4: return "Partners"; case 5: return "Information"; } return null; } } } </code></pre> <p>Can anyone see what is wrong ? </p> <p><strong>EDIT</strong> I tried to put webview in layout but it's still the same In fact, i want to know what is put in cache when app is in background state ? </p>
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    1. CONo idea if it is related, but in your Presentation Fragment you have: onCreateView but inside you call super.onCreate() vs super.onCreateView. That seems a bit weird to me. For the rest, no idea atm
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    2. COI replace super.onCreate() with super.onCreateView() but it's still the same
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