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我使用RecycleView來顯示名稱和說明列表。我正在使用Fragment來查看所需的佈局。現在，我想打開新的活動onItemClick。我在Fragment內聲明瞭SetOnItemClickListener，即在「View onCreateView」中。但它不起作用。這裏是我的代碼：SetOnItemClickListener不能在片段內工作
這是我的java類：
public class TabsHeaderActivity extends AppCompatActivity {
private static final String TAG = TabsHeaderActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabs_header);
final Toolbar toolbar = (Toolbar) findViewById(R.id.htab_toolbar);
setSupportActionBar(toolbar);
if (getSupportActionBar() != null) getSupportActionBar().setTitle("TECHNOLOGY");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
final ViewPager viewPager = (ViewPager) findViewById(R.id.htab_viewpager);
setupViewPager(viewPager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.htab_tabs);
tabLayout.setupWithViewPager(viewPager);
final CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.htab_collapse_toolbar);
try {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.header);
Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
@SuppressWarnings("ResourceType")
@Override
public void onGenerated(Palette palette) {
int vibrantColor = palette.getVibrantColor(R.color.primary_500);
int vibrantDarkColor = palette.getDarkVibrantColor(R.color.primary_700);
collapsingToolbarLayout.setContentScrimColor(vibrantColor);
collapsingToolbarLayout.setStatusBarScrimColor(vibrantDarkColor);
}
});
} catch (Exception e) {
// if Bitmap fetch fails, fallback to primary colors
Log.e(TAG, "onCreate: failed to create bitmap from background", e.fillInStackTrace());
collapsingToolbarLayout.setContentScrimColor(
ContextCompat.getColor(this, R.color.primary_500)
);
collapsingToolbarLayout.setStatusBarScrimColor(
ContextCompat.getColor(this, R.color.primary_700)
);
}
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
Log.d(TAG, "onTabSelected: pos: " + tab.getPosition());
switch (tab.getPosition()) {
case 0:
break;
}
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new DummyFragment(
ContextCompat.getColor(this, R.color.cyan_50)), "Cyan");
adapter.addFrag(new DummyFragment(
ContextCompat.getColor(this, R.color.amber_50)), "Amber");
adapter.addFrag(new DummyFragment(
ContextCompat.getColor(this, R.color.purple_50)), "Purple");
adapter.addFrag(new DummyFragment(
ContextCompat.getColor(this, R.color.grey)), "Grey");
viewPager.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
final MenuItem searchItem = menu.findItem(R.id.menuSearch);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener(){
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
return true;
}
});
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
private static class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
public static class DummyFragment extends Fragment {
int color;
Intent intent;
public DummyFragment() {
}
@SuppressLint("ValidFragment")
public DummyFragment(int color) {
this.color = color;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dummy_fragment, container, false);
final FrameLayout frameLayout = (FrameLayout) view.findViewById(R.id.dummyfrag_bg);
frameLayout.setBackgroundColor(color);
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.dummyfrag_scrollableview);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setHasFixedSize(true);
DessertAdapter adapter = new DessertAdapter(getContext());
recyclerView.setAdapter(adapter);
adapter.SetOnItemClickListener(new DessertAdapter.OnItemClickListener(){
@Override
public void onItemClick(View view, int position) {
switch (position) {
case 3:
intent = new Intent(view.getContext(), LaunchScreenActivity.class);
startActivity(intent);
}
}
});
return view;
}
}
}
這是我的適配器類：
public class DessertAdapter extends RecyclerView.Adapter<DessertAdapter.DessertVh> {
private List<Dessert> desserts = new ArrayList<>();
OnItemClickListener clickListener;
private Context context;
public DessertAdapter(Context context) {
this.context = context;
desserts = Dessert.prepareDesserts(
context.getResources().getStringArray(R.array.dessert_names),
context.getResources().getStringArray(R.array.dessert_descriptions));
}
@Override
public DessertVh onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.item_dessert, parent, false);
return new DessertAdapter.DessertVh(view);
}
@Override
public void onBindViewHolder(DessertVh holder, int position) {
Dessert dessert = desserts.get(position);
holder.mName.setText(dessert.getName());
holder.mDescription.setText(dessert.getDescription());
holder.mFirstLetter.setText(String.valueOf(dessert.getFirstLetter()));
}
@Override
public int getItemCount() {
return desserts == null ? 0 : desserts.size();
}
public class DessertVh extends RecyclerView.ViewHolder implements View.OnClickListener{
private TextView mName;
private TextView mDescription;
private TextView mFirstLetter;
public DessertVh(View itemView) {
super(itemView);
mName = (TextView) itemView.findViewById(R.id.txt_name);
mDescription = (TextView) itemView.findViewById(R.id.txt_desc);
mFirstLetter = (TextView) itemView.findViewById(R.id.txt_firstletter);
}
@Override
public void onClick(View v) {
clickListener.onItemClick(v, getPosition());
}
}
public interface OnItemClickListener {
public void onItemClick(View view, int position);
}
public void SetOnItemClickListener(final OnItemClickListener itemClickListener) {
this.clickListener = itemClickListener;
}
我不知道我做錯了。我已經在調試器模式下檢查過它。我在線路將斷點：
adapter.SetOnItemClickListener(new DessertAdapter.OnItemClickListener(){
現在，當我Activity加載調試器來上這條線，但不進去了。但是，當我點擊某個東西時，調試器甚至不會出現在這一行上，這意味着當我點擊一個項目時，SetOnItemClickListener不會被觸發。
我的XML代碼：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/dummyfrag_bg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/bg_light">
<android.support.v7.widget.RecyclerView
android:id="@+id/dummyfrag_scrollableview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:paddingBottom="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_horizontal_margin" />
</FrameLayout>
您需要在偵聽器中設置一個斷點，如果您想捕捉點擊，而不是在'adapter.SetOnItemClickListener' –
我做到了。當我點擊時，調試器不會進入adapter.SetOnItemClickListener。 –
開關缺少'Break'.. – rafsanahmad007