Question

我一直在尝试在我的应用程序中实现listview一段时间，我正在使用actionbarsherlock。我已经有了这个android.support.v4.Fragment错误一段时间了，这是需要修复的东西/我知道我必须使用来自actionbarsherlock的东西但是我不确定我尝试了FragmentActivity，Activity和SherlockActivity来获取它跑。 CustomizedListView.class是ListView所在的位置，而作为选项卡系统一部分的其他类可以正常工作。这是logcat：

07-20 09:21:01.673    1389-1389/com.example.release E/Trace: error opening trace file: No such file or directory (2)
07-20 09:21:01.869    1389-1389/com.example.release E/AndroidRuntime: FATAL EXCEPTION: main
    java.lang.ClassCastException: com.example.release.CustomizedListView         cannot be cast to android.support.v4.app.Fragment
    at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
    at com.example.release.TabSwipe.getItem(TabSwipe.java:98)
    at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:97)
    at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:829)
    at android.support.v4.view.ViewPager.populate(ViewPager.java:979)
    at android.support.v4.view.ViewPager.populate(ViewPager.java:911)
    at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432)
    at android.view.View.measure(View.java:15518)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
    at android.view.View.measure(View.java:15518)
    at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
    at android.view.View.measure(View.java:15518)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
    at android.view.View.measure(View.java:15518)
    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
    at android.view.Choreographer.doCallbacks(Choreographer.java:562)
    at android.view.Choreographer.doFrame(Choreographer.java:532)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
    at android.os.Handler.handleCallback(Handler.java:725)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:5041)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
    at dalvik.system.NativeStart.main(Native Method)

我的MainActivity.class中的选项卡代码可能会导致它，这可能是因为我忘了做片段之类的事情。

MainActivity.class

import android.os.Bundle;
import android.support.v4.view.ViewPager;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;

public class MainActivity extends SherlockFragmentActivity {

private ViewPager mViewPager;
private TabSwipe mTabSwipe;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mViewPager = new ViewPager(this);
    mViewPager.setId(R.id.pager);
    setContentView(mViewPager);

    final ActionBar bar = getSupportActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    mTabSwipe = new TabSwipe(this, mViewPager);
    mTabSwipe.addTab(bar.newTab().setText("This"), CustomizedListView.class, null);
    mTabSwipe.addTab(bar.newTab().setText("That"), Purchase_Fragment.class, null);
    mTabSwipe.addTab(bar.newTab().setText("Null"), Purchase_Fragment.class, null);


    }
}

CustomizedListView.class

import java.util.ArrayList;
import java.util.HashMap;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import android.app.Activity;
 import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
 import android.view.View;
 import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import com.actionbarsherlock.app.SherlockActivity;

public class CustomizedListView extends Activity {
// All static variables
static final String URL = "http://api.androidhive.info/music/music.xml";
// XML node keys
static final String KEY_SONG = "song"; // parent node
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_ARTIST = "artist";
static final String KEY_DURATION = "duration";
static final String KEY_THUMB_URL = "thumb_url";

ListView list;
LazyAdapter adapter;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();

    XMLParser parser = new XMLParser();
    String xml = parser.getXmlFromUrl(URL); // getting XML from URL
    Document doc = parser.getDomElement(xml); // getting DOM element

    NodeList nl = doc.getElementsByTagName(KEY_SONG);
    // looping through all song nodes <song>
    for (int i = 0; i < nl.getLength(); i++) {
        // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();
        Element e = (Element) nl.item(i);
        // adding each child node to HashMap key => value
        map.put(KEY_ID, parser.getValue(e, KEY_ID));
        map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
        map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST));
        map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION));
        map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL));

        // adding HashList to ArrayList
        songsList.add(map);
    }


    list=(ListView)findViewById(R.id.list);

    // Getting adapter by passing xml data ArrayList
    adapter=new LazyAdapter(this, songsList);
    list.setAdapter(adapter);


    // Click event for single list row
    list.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {


            }
        });
    }
}

Answer 1

您的CustomizedListView应该延长Fragment而不是Activity因为mtabwipe.addtab(...)需要片段

使用FragmentActivity，Activity和SherlockActivity时出错 - Android

1 个答案: