如何在activity中使用Loader？

想在activity中试用loader,可是eclipse总是提示错误，代码如下：

 
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){

  }
}

 

getLoaderManager().initLoader(0, null, this);总是提示有问题，大家有遇到这个问题吗？如何解决。

 

看你的代码你用的是supportV4库，你需要引入FragmentActivity库，你的Activity 继承FragmentActivity；另外用getSupportLoaderManager方法替换你的getLoaderManager。给你个例子：

   

  
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> {
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    getSupportLoaderManager().initLoader(0, null, this);
}

public Loader<Object> onCreateLoader(int i, Bundle bundle){
    return null; // TODO
}

public void onLoadFinished(Loader loader, Object o) {
    Toast.makeText(this, "onLoadFinished", Toast.LENGTH_SHORT).show();
}

public void onLoaderReset(Loader loader)    {
    Toast.makeText(this, "onLoaderReset", Toast.LENGTH_SHORT).show();
}
}