我正在制作一个应用程序，其中有三个选项卡和相应的片段。但是现在我想再添加一个选项卡，但是当我添加它时没有问题，但是当我运行我的应用程序时它会抛出 nullpointerexception。我不知道为什么它正在发生。
请告诉我哪里错了。
这是我的活动，其中所有选项卡都在那里：
public class MainActivity extends Activity {
RelativeLayout rl;
PopupWindow popUp;
LinearLayout layout;
TextView tv;
LayoutParams params;
LinearLayout mainLayout;
Button but;
boolean click = true;
ActionBar.Tab TabOrder , TabCart,TabHistory;
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@SuppressLint("NewApi")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getOverflowMenu();
rl = (RelativeLayout) findViewById(R.id.mainLayout);
//fragMentTra = getFragmentManager().beginTransaction();
ActionBar actionbar = getActionBar();
actionbar.setTitle("Select To Order");
actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// bar.addTab(bar.newTab().setText("ORDER").setTabListener((TabListener) this));
// bar.addTab(bar.newTab().setText("CART").setTabListener(this));
// bar.addTab(bar.newTab().setText("HISTORY").setTabListener(this));
//TabOrder = actionbar.newTab().setText("DEAL");
TabOrder = actionbar.newTab().setText("ORDER");
TabCart = actionbar.newTab().setText("CART");
TabHistory = actionbar.newTab().setText("HISTORY");
//Fragment FragmentDeal = new FragmentDeal();
Fragment FragmentOrder = new FragmentOrder();
Fragment FragmentCart = new FragmentCart();
Fragment FragmentHistory = new FragmentHistory();
//TabOrder.setTabListener(new MyTablistenerClass(FragmentDeal));
TabOrder.setTabListener(new MyTablistenerClass(FragmentOrder));
TabCart.setTabListener(new MyTablistenerClass(FragmentCart));
TabHistory.setTabListener(new MyTablistenerClass(FragmentHistory));
//actionbar.addTab(TabDeal);
actionbar.addTab(TabOrder);
actionbar.addTab(TabCart);
actionbar.addTab(TabHistory);
}
private void getOverflowMenu() {
try {
ViewConfiguration config = ViewConfiguration.get(this);
Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey");
if(menuKeyField != null) {
menuKeyField.setAccessible(true);
menuKeyField.setBoolean(config, false);
}
} catch (Exception e) {
e.printStackTrace();
}
}
片段顺序
@SuppressLint({ "ValidFragment", "NewApi" })
public class FragmentOrder extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//View view = inflater.inflate(R.layout.g, null);
View view = inflater.inflate(R.layout.gridview,null);
final GridView listView = (GridView) view.findViewById(R.id.mainGrid);
listView.setAdapter(new OrderAdapter());
//listView.setSelection(setselected,true);
listView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL);
listView.setMultiChoiceModeListener(new MultiChoiceModeListener() {
@Override
public boolean onActionItemClicked(ActionMode mode,
MenuItem item) {
// TODO Auto-generated method stub
return true;
}
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
mode.setTitle("Select Items");
mode.setSubtitle("One item selected");
return true;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
// TODO Auto-generated method stub
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onItemCheckedStateChanged(ActionMode mode,
int position, long id, boolean checked) {
//listView.setLongClickable(false);
int selectCount = listView.getCheckedItemCount();
switch (selectCount) {
case 1:
mode.setSubtitle("One item selected");
break;
default:
mode.setSubtitle("" + selectCount +"items selected");
break;
}
}
});
return view;
}
}
订单适配器
private class OrderAdapter extends BaseAdapter {
@Override
public int getCount() {
return mThumbIds.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//CheckableLayout l;
View myView = convertView;
LayoutInflater inflater = (LayoutInflater)MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
myView = inflater.inflate(R.layout.grid_items_ontap, null);
// Add The Image!!!
ImageView iv = (ImageView)myView.findViewById(R.id.grid_item_image_OnTap);
iv.setImageResource(mThumbIds[position]);
// Add The Text!!!
TextView tv = (TextView)myView.findViewById(R.id.grid_item_text_onTap);
tv.setText(names[position] );
return myView;
}
}
private Integer[] mThumbIds = {
R.drawable.car, R.drawable.car,
R.drawable.car, R.drawable.car,
R.drawable.car,R.drawable.car,R.drawable.car,R.drawable.car, R.drawable.car,
R.drawable.car, R.drawable.car,
R.drawable.car,R.drawable.car,R.drawable.car
};
private String[] names={"ab","cd","ef","gh","ij","kl","mn","","","","","","",""};
片段历史
@SuppressLint("ValidFragment")
public class FragmentHistory extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View layout = inflater.inflate(R.layout.activity_fragmenthistory,
(ViewGroup)
findViewById(R.id.layout_root_history));
ListView lv = (ListView) layout.findViewById(R.id.listViewHistory);
lv.setAdapter(new HistoryListViewAdapter(MainActivity.this));
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View view, int position,
long id) {
// TODO Auto-generated method stub
AlertDialog.Builder dlg = new AlertDialog.Builder(MainActivity.this);
dlg.setTitle("ORDERID");
dlg.setPositiveButton("REORDER",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
})
.setNegativeButton("EDIT AND ORDER", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
ListView listView = new ListView(MainActivity.this);
listView.setAdapter(new DialogListAdapter(MainActivity.this));
dlg.setView(listView);
//((Dialog) dlg).setCanceledOnTouchOutside(true);
// show it
dlg.show();
}
});
return layout;
}
}
碎片车
@SuppressLint("ValidFragment")
public class FragmentCart extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View layout = inflater.inflate(R.layout.activity_fragmentcart,
(ViewGroup)
findViewById(R.id.layout_root_cart));
ListView lv = (ListView) layout.findViewById(R.id.listViewCart);
lv.setAdapter(new CartListViewAdapter(MainActivity.this));
//lv.invalidateViews();
return layout;
}
}
碎片交易
@SuppressLint("ValidFragment")
public class FragmentDeal extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View layout = inflater.inflate(R.layout.fragmentdeal,
(ViewGroup)
findViewById(R.id.layoutdeal));
//View view = inflater.inflate(R.layout.griddeal,null);
final GridView listView = (GridView) layout.findViewById(R.id.GridDeal);
listView.setAdapter(new DealAdapter());
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
}
});
return layout;
// TODO Auto-generated method stub
}
}
private class DealAdapter extends BaseAdapter {
@Override
public int getCount() {
return mThumbIds1.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//CheckableLayout l;
View myView = convertView;
LayoutInflater inflater = (LayoutInflater)MainActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
myView = inflater.inflate(R.layout.griddealitems, null);
// Add The Image!!!
ImageView iv = (ImageView)myView.findViewById(R.id.grid_deal_image);
iv.setImageResource(mThumbIds1[position]);
// Add The Text!!!
TextView tv = (TextView)myView.findViewById(R.id.grid_deal_text);
tv.setText(names1[position] );
return myView;
}
private Integer[] mThumbIds1 = {
R.drawable.car, R.drawable.car,
R.drawable.car, R.drawable.car
};
private String[] names1={"ab","cd","ef","gh"};
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item){
switch(item.getItemId()){
case R.id.action_settings:
Intent intentForSettings = new Intent(MainActivity.this, SettingsMenu.class);
startActivity(intentForSettings);
return true;
case R.id.action_info:
Intent intentForInformation = new Intent(MainActivity.this,InformationMenu.class);
startActivity(intentForInformation);
return true;
case R.id.action_ContactUs:
Intent dial = new Intent();
String no = "9579839314";
dial.setAction("android.intent.action.DIAL");
dial.setData(Uri.parse("tel:"+ no));
startActivity(dial);
return true;
}
return false;
}
public class MyTablistenerClass implements android.app.ActionBar.TabListener {
Fragment fragment1;
@SuppressLint("NewApi")
public MyTablistenerClass(Fragment fragment){
this.fragment1 = fragment;
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
FragmentTransaction fragMentTra;
if (tab.getText().equals("DEAL")) {
try {
rl.removeAllViews();
} catch (Exception e) {
}
FragmentDeal Fram1 = new FragmentDeal();
//fragMentTra.addToBackStack(null);
fragMentTra = getFragmentManager().beginTransaction();
fragMentTra.add(rl.getId(), Fram1);
fragMentTra.commit();
}
else if (tab.getText().equals("ORDER")) {
try {
rl.removeAllViews();
} catch (Exception e) {
}
FragmentOrder Fram2 = new FragmentOrder();
//fragMentTra.addToBackStack(null);
fragMentTra = getFragmentManager().beginTransaction();
fragMentTra.add(rl.getId(), Fram2);
fragMentTra.commit();
}
else if(tab.getText().equals("CART")){
try {
rl.removeAllViews();
} catch (Exception e) {
}
FragmentCart fram3 = new FragmentCart();
//fragMentTra.addToBackStack(null);
fragMentTra = getFragmentManager().beginTransaction();
fragMentTra.add(rl.getId(), fram3);
fragMentTra.commit();
}
else if(tab.getText().equals("HISTORY")){
try {
rl.removeAllViews();
} catch (Exception e) {
}
FragmentHistory fram4 = new FragmentHistory();
//fragMentTra.addToBackStack(null);
fragMentTra = getFragmentManager().beginTransaction();
fragMentTra.add(rl.getId(), fram4);
fragMentTra.commit();
}
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
}
在添加 tabdeal 时，我遇到了问题。FragmentDeal 是其各自的 Fragment。如果有人能看到我错在哪里，请告诉我。谢谢。