我刚刚开始使用android，并尝试在其片段中创建带有listview的选项卡式布局。什么是最好的选择。？ 我试过下面哪个有效： 1.为listview制作自定义适配器 2.带有虚拟片段的双标签动作栏布局 当我尝试将listview活动用作片段时，应用程序崩溃了。我已粘贴下面的代码。 应用程序概念：票务预订应用程序！为此，我创建了一个Movie类，其中包含电影名称，类别和评论详细信息。 MovieManager制作电影列表。应用程序在打开片段活动时崩溃，该片段活动将移动列表保存在不同的类别[标签]中。
在打开时崩溃应用的活动：
//包含不同类别中的电影列表的活动 公共类AllMovies扩展了FragmentActivity {
private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item";
ListViewHollyLV;
ListViewBollyLV;
ListViewKollyLV;
private void ListCreater()
{
HollyLV = (ListView)findViewById(R.id.bollyListView1);
newMovieListActivity().CurrentLV = (ListView)findViewById(R.id.bollyListView1);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_all_movies);
ListCreater();
// Set up the action bar to show tabs.
finalActionBaractionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// for each of the sections in the app, add a tab to the action bar.
Tab tab = actionBar.newTab().setText(R.string.hello_world).setTabListener(new TabListener( this, "holly", MovieListActivity.class));
actionBar.addTab(tab);
tab = actionBar.newTab().setText(R.string.hello_world).setTabListener(new TabListener( this, "bolly", Fragi2.class));
actionBar.addTab(tab);
}
static class TabListener implements ActionBar.TabListener {
private Fragment mFragment;
private final Activity mActivity;
private final String mTag;
private final Class mClass;
/** Constructor used each time a new tab is created.
* * @paramactivity The host Activity, used to instantiate the fragment
* * @paramtag The identifier tag for the fragment
* * @paramclz The fragment's Class, used to instantiate the fragment
* */
publicTabListener(Activity activity, String tag, Class clz)
{ mActivity = activity;
mTag = tag;
mClass = clz; }
/* The following are each of the ActionBar.TabListener callbacks */
public void onTabSelected(Tab tab, FragmentTransactionft) {
// Check if the fragment is already initialized
if (mFragment == null) {
// If not, instantiate and add it to the activity
mFragment = Fragment.instantiate(mActivity, mClass.getName());
ft.add(R.id.fragmentCnt, mFragment, mTag);
}
else {
// If it exists, simply attach it in order to show it
ft.attach(mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransactionft)
{
if (mFragment != null) {
// Detach the fragment, because another one is being attached
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransactionft) {
// User selected the already selected tab. Usually do nothing.
}
}
//This fragment is used for “holly” tab
public static class MovieListActivity extends Fragment {
ListViewCurrentLV;
@Override
public View onCreateView(LayoutInflaterinflater, ViewGroup container,
Bundle savedInstanceState){
// Inflate the menu; this adds items to the action bar if it is present.
View V = inflater.inflate(R.layout.activity_frag1, container, false);
ManageMovieList.MakeList(); // Makes separate list of Hollywood and bollywood //movies
LoadMovieList();
return V;
}
@Override
public void onPause() {
super.onPause();
}
//Loads the Hollywood movie list to the listview using custom adapter
private void LoadMovieList()
{
ManageMovieList.HollywoodMovieAdapter(getActivity(), CurrentLV);
}
}
/// Dummy Fragment class (was created while trying tabbed layout) which contains only ///textview. Still this fragment is used for “bolly” tab
public static class Fragi1 extends Fragment {
@Override
public View onCreateView(LayoutInflaterinflater, ViewGroup container,
Bundle savedInstanceState){
// Inflate the menu; this adds items to the action bar if it is present.
View V = inflater.inflate(R.layout.activity_frag1, container, false);
return V;
}
}
}
自定义适配器
public class CustomMovieArrayAdapter extends ArrayAdapter {
private final Context context;
ArrayList<Movie> _Movies ;
static final String REVIEW = "com.example.ticketonline";
publicCustomMovieArrayAdapter(Context context, ArrayList<Movie>movieItems) {
super(context, R.layout.movie_list_item, movieItems);
this.context = context;
_Movies = movieItems;
Movie currentMovie = new Movie();
ArrayList<Movie> _Movies ;
}
String Title;
String category;
int Id;
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflaterinflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = inflater.inflate(R.layout.movie_list_item, parent, false);
TextViewtextName = (TextView) convertView.findViewById(R.id.textViewMovieName);
TextViewtextCate = (TextView) convertView.findViewById(R.id.textViewMovieCategory);
ImageViewimageView = (ImageView) convertView.findViewById(R.id.imageViewMoviePoster);
Button btn = (Button)convertView.findViewById(R.id.buttonSelectMovie);
textName.setText(_Movies.get(position).GetMovieName(position));
textCate.setText(_Movies.get(position).GetMovieCategory(position));
imageView.setImageResource(_Movies.get(position).GetMoviePosterID(position));
finalint p = position;
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(context, ReviewAndBook.class);
intent.putExtra(REVIEW, Movie.GetMovieReview(p));
intent.putExtra(android.content.Intent.EXTRA_TEXT, Movie.GetMovieDirector(p));
intent.putExtra(android.content.Intent.EXTRA_SUBJECT, Movie.GetMovieCast(p));
context.startActivity(intent);
}
});
}
returnconvertView;
}
}
驻留在MovieManager类中的方法
public static void HollywoodMovieAdapter(Context cnt,ListViewmovieListUI)
{
//ListViewmovieListUI = (ListView)findViewById(R.id.movieListView);
ArrayList<Movie> _hollywoodMovies = ManageMovieList.RecentMovies_Holly;
movieListUI.setAdapter( new CustomMovieArrayAdapter(cnt, _hollywoodMovies));
}
答案 0 :(得分：0)
我在有限的经验中看到的一个常见问题是，难以检测的错误可能源自片段布局xml文件。例如，如果存在任何“循环引用”（易于使用RelativeLayout），您的应用程序可能会运行，但是当您打开使用该xml的片段时会崩溃。在Logcat中没有真正指定这种崩溃，它会指向片段中的一行实际上没有问题的代码。代码行创建logcat错误的原因可能是布局xml文件中的错误。