Initializing a Loader in an Activity

Question

I am currently trying to learn how to use Loaders and am having trouble starting a Loader in my activity.

import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader;  public class ASwitchActivity extends Activity implements               LoaderManager.LoaderCallbacks<SampleLoader.SampleLoaderResult> {      public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         getLoaderManager().initLoader(0, null, this);     }      public Loader<SampleLoader.SampleLoaderResult> onCreateLoader(int id, Bundle args) {       return new SampleLoader(getBaseContext(), account, "dog"); }    public void onLoadFinished(Loader<SampleLoader.SampleLoaderResult> loader, SampleLoader.SampleLoaderResult out)   {       TextView t=(TextView)findViewById(R.id.testTV);       t.setText("yay");   }    public void onLoaderReset(Loader<SampleLoader.SampleLoaderResult> loader){    } }    

However Eclipse gives an error stating:

The method initLoader(int, Bundle, LoaderManager.LoaderCallbacks) in the type LoaderManager is not applicable for the arguments (int, null, ActivitySwitchActivity)

Can anyone help with where I am going wrong?

Answer 1

As I can see you use supportV4 library. So to implement Loader you should do some things:

1. extend your activity from FragmentActivity class
2. Use getSupportLoaderManager method instead of getLoaderManager

here is sample code:

import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; import android.widget.Toast;  public class MyActivity extends FragmentActivity implements LoaderManager.LoaderCallbacks<Object> { @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);     getSupportLoaderManager().initLoader(0, null, this); }  @Override public Loader<Object> onCreateLoader(int i, Bundle bundle){     return null; // TODO }  @Override public void onLoadFinished(Loader loader, Object o) {     Toast.makeText(this, "onLoadFinished", Toast.LENGTH_SHORT).show(); }  @Override public void onLoaderReset(Loader loader)    {     Toast.makeText(this, "onLoaderReset", Toast.LENGTH_SHORT).show(); } }