0
喜上午newbee Android和我現在所面臨的問題與選項卡活動 任何一個可以幫助...如何停止第二片面包中得到第一個選項卡中的活動會自動顯示
我附上截圖
問題面對 - 當我默認打開我的應用程序第一個選項卡顯示，但從第二個選項卡「第二個選項卡選擇...」的麪包顯示在第一個選項卡爲什麼發生這種情況？
第一標籤是home_fragment.java 2tab vehicle.java和烤麪包片從該車輛片段被顯示在家庭片段 和第三顯示在第二標籤片段
主activity.java
public class MainActivity extends AppCompatActivity {
private static Button button;
private static EditText editText;
private static TextView textView;
static DatabaseHelper databaseHelper;
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
private int []tabicon={R.drawable.home,R.drawable.people,R.drawable.messege};
private TabLayout tabLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
// setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
setupViewPager(mViewPager);/* new line*/
// DatabaseHelper databaseHelper=new DatabaseHelper(getBaseContext(),null,null,1);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
tabLayout.setSelectedTabIndicatorHeight(10);
tabLayout.getTabAt(0).setIcon(R.drawable.home);
tabLayout.getTabAt(1).setIcon(R.drawable.people);
tabLayout.getTabAt(2).setIcon(R.drawable.messege);
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
mViewPager.setCurrentItem(tab.getPosition());
}
@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.addFragment(new Home_fragment(),"home");
adapter.addFragment(new vehicle(),"vehicle");
adapter.addFragment(new Message(),"Message");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter
{
private final List<Fragment> mfragmentList=new ArrayList<>();
private final List<String>mfragmenttitlelist= new ArrayList<>();
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return mfragmentList.get(position);
}
@Override
public int getCount() {
return mfragmentList.size();
}
public void addFragment(Fragment fragment,String s)
{
mfragmentList.add(fragment);
mfragmenttitlelist.add(s);
}
@Override
public CharSequence getPageTitle(int position) {
return mfragmenttitlelist.get(position);
}
}
@Override
public void onBackPressed() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(false);
builder.setMessage("Do you want to Exit?");
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//if user pressed "yes", then he is allowed to exit from application
finish();
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//if user select "No", just cancel this dialog and continue with app
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_main, container, false);
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "home";
case 1:
return "vehicle";
case 2:
return "Message";
}
return null;
}
}
}
Home_fragment.java
public class Home_fragment extends Fragment
{
private EditText editText;
private Button button;
private TextView textView;
static DatabaseHelper databaseHelper;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
//return super.onCreateView(inflater, container, savedInstanceState);
View view=inflater.inflate(R.layout.fragment_home,container,false);
editText=(EditText) view.findViewById(R.id.search);
button=(Button)view.findViewById(R.id.search_btn);
textView=(TextView)view.findViewById(R.id.search_result);
databaseHelper=new DatabaseHelper(getContext(),null,null,1);
databaseHelper.getReadableDatabase();
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String string;
if (editText.getText().toString().isEmpty())
{
Toast.makeText(getActivity(), "Please enter bike number", Toast.LENGTH_SHORT).show();
}
else {
try {
string = databaseHelper.searchName(editText.getText().toString());
textView.setText(string);
} catch (SQLiteException e)
{
e.printStackTrace();
Toast.makeText(getActivity(), "Please enter name", Toast.LENGTH_SHORT).show();
}
}
// return true;
}
});
return view;
}
}
vehical.java第二個片段
public class vehicle extends Fragment
{
private ListView listView;
private TextView textView;
private ArrayAdapter<String> listadapter;
// DatabaseHelper databaseHelper=new DatabaseHelper(getBaseContext(),null,null,1);
// databaseHelper.getWritableDatabase();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//return super.onCreateView(inflater, container, savedInstanceState);
View view=inflater.inflate(R.layout.fragment_vehical,container,false);
listView=(ListView) view.findViewById(R.id.list_view);
textView=(TextView)view.findViewById(R.id.total_count);
final DatabaseHelper databaseHelper=new DatabaseHelper(getContext(),null,null,1);
//databaseHelper.getReadableDatabase();
final ArrayList<String> arrayList=databaseHelper.readNames();
final ArrayAdapter<String> arrayAdapter;
arrayAdapter = new ArrayAdapter<String>(getContext(),android.R.layout.simple_list_item_2,android.R.id.text1,arrayList);
arrayAdapter.notifyDataSetChanged();
listView.setAdapter(arrayAdapter);
textView.setText("Total customer "+String.valueOf(listView.getCount()));
Toast.makeText(getActivity(), "2nd tab selected", Toast.LENGTH_SHORT).show();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
listView.getItemAtPosition(position);
Toast.makeText(getActivity(), "Name selected: "+arrayList.get(position), Toast.LENGTH_SHORT).show();
//databaseHelper.upDate(arrayList.get(position));
// arrayList.get(position)=databaseHelper.upDate(arrayAdapter);
// Intent intent=new Intent(getActivity(),Add_customer.class);
// startActivity(intent);
//String name=parent.getSelectedItem();
}
});
FloatingActionButton fab = (FloatingActionButton) view.findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(),Add_customer.class);
startActivity(intent);
Snackbar.make(view, "Customer form", Snackbar.LENGTH_LONG)
.setAction("Action", new Add_customer()).show();
}
});
// StringBuffer stringBuffer=databaseHelper.getData(); //get data from database in databasehelper.java
//
// ArrayList<StringBuffer> cust_list= new ArrayList<>(stringBuffer);
// cust_list.addAll(Arrays.asList(stringBuffer));
// listadapter=new ArrayAdapter<String>(vehicle.this,R.layout.fragment_vehical,cust_list);
return view;
}
}
歡迎堆棧溢出！請參閱[如何完成最小，完整和可驗證示例]（/ help/mcve）。 –