如何 control/modify 来自 viewpager 片段的 activity textview
how to control/modify the activity textview from viewpager fragment
我有一个 viewpager，它有五个选项卡并使用 tablayout 控制选项卡。我遇到的问题是，当我想从一个 activity 转到另一个 activity 时，标题不会改变。我所做的是，我在 activity 中的 onTabSelected 中更改了 tablayout 中的 textview 标题，但在 select 选项卡和 reselect 选项卡方法中都更改了，但有时它不会改变了。
另一件事是地图，我在主 activity 标题中使用了地图的地址。我使用 setOnCameraChangeListener 方法更改了地址，这种情况的问题是它 运行 好几次，即使我在另一个片段中也是如此，因为我在我的主 activity 标题中使用了它的地址，它改变了它。
他还更改了每个片段中 onViewCreate 和 onCreateView 的标题，但效果不佳。
这就是我所做的一切：
public class MainPageActivity extends AppCompatActivity {
private TabLayout tabLayout;
public Context context;
public Typeface tf;
public LinearLayout linearLayout;
public static boolean a=false;
private CustomViewPager viewPager;
private int[] tabIcons = {
R.drawable.home,
R.drawable.ic_tab_montakhab,
R.drawable.ic_tab_search,
R.drawable.ic_tab_issue,
R.drawable.ic_tab_profile
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_page);
tf = Typeface.createFromAsset(getAssets(), "IRANSans_Bold.ttf");
context=this;
TextView google_header_address=(TextView)findViewById(R.id.google_header_address);
tabCustomization();
setupTabIcons();
tabLayout.getTabAt(0).getIcon().setColorFilter(Color.parseColor("#f6fda6"), PorterDuff.Mode.SRC_IN);
linearLayout=(LinearLayout)tabLayout.getTabAt(0).getCustomView();
ImageView firstTab=(ImageView)linearLayout.getChildAt(0);
firstTab.setColorFilter(Color.parseColor("#f6fda6"), PorterDuff.Mode.SRC_IN);
google_header_address.setText("");
google_header_address.setVisibility(View.VISIBLE);
}
private void tabCustomization() {
viewPager = (CustomViewPager) findViewById(R.id.viewPager);
viewPager.setPagingEnabled(false);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new MenuFragment(), "tab1");
adapter.addFragment(new AddressFragment(), "tab2");
adapter.addFragment(new SearchFragment(), "tab3");
adapter.addFragment(new IssueFragment(), "tab4");
adapter.addFragment(new ProfileFragment(), "tab5");
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(5);
for (int i = 0; i < tabLayout.getTabCount(); i++) {
TabLayout.Tab tab = tabLayout.getTabAt(i);
tab.setCustomView(adapter.getTabView(tabLayout,i));
}
ViewGroup vg = (ViewGroup) tabLayout.getChildAt(0);
int tabsCount = vg.getChildCount();
Log.i("TabChild",String.valueOf(tabsCount));
// Iterate over all tabs and set the custom view
}
public void setupViewPager(ViewPager viewPager) {
}
private void setupTabIcons() {
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
tabLayout.getTabAt(2).setIcon(tabIcons[2]);
tabLayout.getTabAt(3).setIcon(tabIcons[3]);
tabLayout.getTabAt(4).setIcon(tabIcons[4]);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener(){
@Override
public void onTabSelected(TabLayout.Tab tab) {
TabChanges(tab);
}
private void TabChanges(TabLayout.Tab tab) {
linearLayout=(LinearLayout)tab.getCustomView();
ImageView v=(ImageView)linearLayout.getChildAt(0);
v.setColorFilter(Color.parseColor("#f6fda6"), PorterDuff.Mode.SRC_IN);
TextView google_header_address=(TextView)findViewById(R.id.google_header_address);
switch (tab.getPosition())
{
case 0:
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setVisibility(View.VISIBLE);
google_header_address.setText("");
ClearFragmentStack();
Toast.makeText(context,"title"+String.valueOf((int)getResources().getDimension(R.dimen.text_size_bw_small)),Toast.LENGTH_LONG).show();
break;
case 1:
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab2 title");
ClearFragmentStack();
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
case 2:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab3 title ");
Toast.makeText(context,"title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)),Toast.LENGTH_LONG).show();
break;
case 3:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab4 title");
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
case 4:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab5 title");
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
}
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
linearLayout=(LinearLayout)tab.getCustomView();
ImageView v=(ImageView)linearLayout.getChildAt(0);
v.setColorFilter(Color.parseColor("#ffffff"), PorterDuff.Mode.SRC_IN);
TextView google_header_address=(TextView)findViewById(R.id.google_header_address);
google_header_address.setText("");
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
linearLayout=(LinearLayout)tab.getCustomView();
ImageView v=(ImageView)linearLayout.getChildAt(0);
v.setColorFilter(Color.parseColor("#f6fda6"), PorterDuff.Mode.SRC_IN);
TextView google_header_address=(TextView)findViewById(R.id.google_header_address);
switch (tab.getPosition())
{
case 0:
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setVisibility(View.VISIBLE);
google_header_address.setText("");
ClearFragmentStack();
Toast.makeText(context,"title"+String.valueOf((int)getResources().getDimension(R.dimen.text_size_bw_small)),Toast.LENGTH_LONG).show();
break;
case 1:
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab2 title");
ClearFragmentStack();
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
case 2:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab3 title");
Toast.makeText(context,"title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)),Toast.LENGTH_LONG).show();
break;
case 3:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab4 title");
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
case 4:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab5 title");
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
}
}
});
}
private void ClearFragmentStack() {
FragmentManager fm = getSupportFragmentManager();
for(int i = 0; i < fm.getBackStackEntryCount(); ++i) {
fm.popBackStack();
}
}
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 addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public View getCustomView(TabLayout tabLayout,int position){
View view = LayoutInflater.from(getApplicationContext())
.inflate(R.layout.custom_tab, tabLayout, false);
TextView textView= (TextView) view.findViewById(R.id.tabText);
textView.setText(getPageTitle(position));
textView.setTypeface(tf);
ImageView imageView = (ImageView) view.findViewById(R.id.imageView);
imageView.setImageResource(tabIcons[position]);
return view;
}
public View getTabView(TabLayout tabLayout,int position) {
// Given you have a custom layout in `res/layout/custom_tab.xml` with a TextView and ImageView
View view = LayoutInflater.from(getApplicationContext())
.inflate(R.layout.custom_tab, tabLayout, false);
TextView textView= (TextView) view.findViewById(R.id.tabText);
textView.setText(getPageTitle(position));
textView.setTypeface(tf);
ImageView imageView = (ImageView) view.findViewById(R.id.imageView);
imageView.setImageResource(tabIcons[position]);
return view;
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
//Caligraphy Library
@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
这就是我在第一个选项卡中所做的一切，其中包含我在标题中使用的产品地址，并在地图上显示当前位置。
public class _step1_mapfragment extends Fragment {
MapView mMapView;
private GoogleMap googleMap;
public static boolean Stop_searcLocation=true;
public LatLng GetCurrentLocation;
public ImageView IV_title;
public ImageView IV_marker;
private static final int PICK_IMAGE_ID = 234;
private String FilePath;
public String FIleName = "images.jpg";
ImageView Prescription_img;
// directory name to store captured images and videos
public _step1_mapfragment() {
// Required empty public constructor
}
Uri file;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView= inflater.inflate(R.layout.fragment__step1_mapfragment, container, false);
Change_MarkerImage(rootView);
Control_Map(savedInstanceState,rootView);
GeocodeAsyncTask AddressTask=new GeocodeAsyncTask(UIHelper.Latitude,
UIHelper.Logitude);
AddressTask.execute();
FilePath=getActivity().getFilesDir().getParentFile().getPath() + "/files/";
try {
copyfile(getActivity());
} catch (IOException e) {
e.printStackTrace();
}
File f = new File(FilePath + FIleName);
Log.d("FileName:",f.getName());
Prescription_img= (ImageView) getActivity().findViewById(R.id.prescription);
ClearFragmentStack();
fav_GetAddress(rootView);
return rootView;
}
private void ClearFragmentStack() {
FragmentManager fm = getActivity().getSupportFragmentManager();
for(int i = 0; i < fm.getBackStackEntryCount(); ++i) {
fm.popBackStack();
}
}
private void Change_MarkerImage(final View rootView) {
IV_marker = (ImageView) rootView.findViewById(R.id.confirm_address_map_custom_marker);
IV_title = (ImageView) rootView.findViewById(R.id.Image_title);
IV_marker.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
IV_marker.setImageResource(R.drawable.ic_new_mark_icon);
IV_title.setVisibility(View.VISIBLE);
}
});
IV_title.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getActivity(),"Clicked well",Toast.LENGTH_LONG).show();
/* checksCameraPermission(view);*/
IV_title.setVisibility(View.GONE);
TakeImage();
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 100) {
if (resultCode == -1) {
Bundle args=new Bundle();
// I'll assume this is a Context and bitmap is a Bitmap
File fileUrl=new File(file.getPath());
args.putString("image",fileUrl.getAbsolutePath());
_step2_fragmentconfirm_pic confirmPicFragment=new _step2_fragmentconfirm_pic();
confirmPicFragment.setArguments(args);
Toast.makeText(getActivity(),"getting image ready",Toast.LENGTH_LONG).show();
FragmentTransaction transaction=getFragmentManager().beginTransaction();
transaction.replace(R.id.root_menu_fragment,confirmPicFragment);
transaction.addToBackStack("mapView");
transaction.commit();
Toast.makeText(getActivity(), "Everything is ok but frag error is the case", Toast.LENGTH_SHORT).show();
}
}
}
public void copyfile(Context context) throws IOException {
Log.d("File Path:",FilePath);
InputStream myInput=context.getAssets().open(FIleName);
String outFileName=FilePath+FIleName;
OutputStream myOutPut=new FileOutputStream(outFileName);
byte[] buffer=new byte[1024];
int length;
while ((length=myInput.read(buffer))>0)
{
myOutPut.write(buffer,0,length);
}
myOutPut.flush();
myOutPut.close();
myInput.close();
}
private void TakeImage() {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(), new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
}
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
file = Uri.fromFile(ImagePicker.getTempFile(getActivity()));
} catch (Exception e) {
e.printStackTrace();
}
intent.putExtra(MediaStore.EXTRA_OUTPUT, file);
startActivityForResult(intent, 100);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == 0) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED) {
TakeImage();
}
}
}
@Override
public void onResume() {
super.onResume();
Stop_searcLocation=true;
mMapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
private void Control_Map(Bundle savedInstanceState, View rootView) {
mMapView = (MapView) rootView.findViewById(R.id.mapView);
mMapView.onCreate(savedInstanceState);
mMapView.onResume(); // needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
mMapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
}
});
googleMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
@Override
public void onCameraChange(CameraPosition cameraPosition) {
UIHelper.Latitude=cameraPosition.target.latitude;
UIHelper.Logitude=cameraPosition.target.longitude;
GeocodeAsyncTask AddressTask=new GeocodeAsyncTask(cameraPosition.target.latitude,
cameraPosition.target.longitude);
AddressTask.execute();
}
});
// For showing a move to my location button
if(ContextCompat.checkSelfPermission(getActivity(),
android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION)==
PackageManager.PERMISSION_GRANTED){
googleMap.setMyLocationEnabled(true);
} else
{
ActivityCompat.requestPermissions(getActivity(),new String[]{
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
},1);
}
// For dropping a marker at a point on the Map
googleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location location) {
{
Stop_searcLocation=false;
GetCurrentLocation = new LatLng(location.getLatitude(), location.getLongitude());
Toast.makeText(getActivity(), "Set Location", Toast.LENGTH_SHORT).show();
CameraPosition cameraPosition = new CameraPosition.Builder().target(GetCurrentLocation).zoom(18).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
}
});
}
});
}
class GeocodeAsyncTask extends AsyncTask<Void, Void, Address> {
double strLatitude;
double strLongitude;
public GeocodeAsyncTask(double strLatitude, double strLongitude){
this.strLatitude=strLatitude;
this.strLongitude=strLongitude;
}
String errorMessage = "";
@Override
protected void onPreExecute() {
}
@Override
protected Address doInBackground(Void ... none) {
Log.i("Started","start one");
Locale.setDefault(new Locale("fa"));
Geocoder geocoder = new Geocoder(getActivity(), Locale.getDefault());
List<Address> addresses = null;
double latitude = strLatitude;
double longitude = strLongitude;
try {
addresses = geocoder.getFromLocation(latitude, longitude, 1);
} catch (IOException ioException) {
errorMessage = "Service Not Available";
} catch (IllegalArgumentException illegalArgumentException) {
errorMessage = "Invalid Latitude or Longitude Used";
}
if(addresses != null && addresses.size() > 0) {
Log.i("Started", "start two");
return addresses.get(0);
}
return null;
}
protected void onPostExecute(Address address) {
Locale.setDefault(new Locale("fa"));
Log.i("Started","start three");
if(address == null) {
}
else {
Log.i("Started","start four");
String addressName = "";
for(int i = 0; i < address.getMaxAddressLineIndex(); i++) {
if(i==0)
addressName += address.getAddressLine(i);
else
addressName += "،" + address.getAddressLine(i);
}
Log.i("Started", String.valueOf(address.getMaxAddressLineIndex()));
Locale.setDefault(new Locale("fa"));
UIHelper.setTvText(getActivity(), R.id.google_header_address, addressName);
}
}
}
public void fav_GetAddress(View view){
final Dialog dialog = new Dialog(getActivity());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.alert_dialog_custom);
dialog.getWindow().setBackgroundDrawableResource(R.drawable.draw_radius_cost_info);
// set the custom dialog components - text, image and button
TextView dialogButton = (TextView) dialog.findViewById(R.id.dialogOK);
// if button is clicked, close the custom dialog
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
LinearLayout imageView=(LinearLayout)view.findViewById(R.id.fav_GetAddress);
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.show();
}
});
// custom dialog
}
一种更简单的方法是使用 EventBus 。这允许 publish-subscribe-style 组件之间的通信，而不需要组件显式地相互注册（从而相互了解）。它专为使用显式注册取代传统的 Java in-process 事件分发而设计。为了在 Android 中使用 EventBus，请在 gradle（应用级别）中添加：
compile 'org.greenrobot:eventbus:3.0.0'
现在您需要创建一个 Event 。一个事件只是一个对象，它是从总线上的发送者 post 发送的，并将传递给任何订阅相同事件类型的接收者 class。而已！。因此，为此我们将创建一个示例 Event class:
public class HelloWorldEvent {
private final String message;
public HelloWorldEvent(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
}
现在下一步是创建一个 Sender 。这允许您从整个 Android 应用程序的任何部分 post 任何事件。因此，在您的情况下，您可以从 Fragments、viewpager 等发送。这就是你的做法：
EventBus.getDefault().post(new HelloWorldEvent("Hello EventBus!”);
所以这会发送一个新的 event，但是为了接收它，您需要有人接收它。因此，为了从任何 activity 中收听，从您的 activity class 中说，首先您需要注册它：
EventBus.getDefault().register(this);
然后在class里面定义一个新方法：
// This method will be called when a HelloWorldEvent is posted
@Subscribe
public void onEvent(HelloWorldEvent event){
// your implementation
Toast.makeText(getActivity(), event.getMessage(), Toast.LENGTH_SHORT).show();
}
因此，无论何时发送 Event，都会被 receiver 接收。因此，您可以创建一个 Event 并向其添加多个侦听器。它会正常工作，如下图所示：
有关 EventBus 库的更多信息可在此处获取：
此处提供了有关 EventBus 的更简单的教程：
他还更改了每个片段中 onViewCreate 和 onCreateView 的标题，但效果不佳。
这就是我所做的一切：
public class MainPageActivity extends AppCompatActivity {
private TabLayout tabLayout;
public Context context;
public Typeface tf;
public LinearLayout linearLayout;
public static boolean a=false;
private CustomViewPager viewPager;
private int[] tabIcons = {
R.drawable.home,
R.drawable.ic_tab_montakhab,
R.drawable.ic_tab_search,
R.drawable.ic_tab_issue,
R.drawable.ic_tab_profile
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_page);
tf = Typeface.createFromAsset(getAssets(), "IRANSans_Bold.ttf");
context=this;
TextView google_header_address=(TextView)findViewById(R.id.google_header_address);
tabCustomization();
setupTabIcons();
tabLayout.getTabAt(0).getIcon().setColorFilter(Color.parseColor("#f6fda6"), PorterDuff.Mode.SRC_IN);
linearLayout=(LinearLayout)tabLayout.getTabAt(0).getCustomView();
ImageView firstTab=(ImageView)linearLayout.getChildAt(0);
firstTab.setColorFilter(Color.parseColor("#f6fda6"), PorterDuff.Mode.SRC_IN);
google_header_address.setText("");
google_header_address.setVisibility(View.VISIBLE);
}
private void tabCustomization() {
viewPager = (CustomViewPager) findViewById(R.id.viewPager);
viewPager.setPagingEnabled(false);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new MenuFragment(), "tab1");
adapter.addFragment(new AddressFragment(), "tab2");
adapter.addFragment(new SearchFragment(), "tab3");
adapter.addFragment(new IssueFragment(), "tab4");
adapter.addFragment(new ProfileFragment(), "tab5");
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(5);
for (int i = 0; i < tabLayout.getTabCount(); i++) {
TabLayout.Tab tab = tabLayout.getTabAt(i);
tab.setCustomView(adapter.getTabView(tabLayout,i));
}
ViewGroup vg = (ViewGroup) tabLayout.getChildAt(0);
int tabsCount = vg.getChildCount();
Log.i("TabChild",String.valueOf(tabsCount));
// Iterate over all tabs and set the custom view
}
public void setupViewPager(ViewPager viewPager) {
}
private void setupTabIcons() {
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
tabLayout.getTabAt(2).setIcon(tabIcons[2]);
tabLayout.getTabAt(3).setIcon(tabIcons[3]);
tabLayout.getTabAt(4).setIcon(tabIcons[4]);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener(){
@Override
public void onTabSelected(TabLayout.Tab tab) {
TabChanges(tab);
}
private void TabChanges(TabLayout.Tab tab) {
linearLayout=(LinearLayout)tab.getCustomView();
ImageView v=(ImageView)linearLayout.getChildAt(0);
v.setColorFilter(Color.parseColor("#f6fda6"), PorterDuff.Mode.SRC_IN);
TextView google_header_address=(TextView)findViewById(R.id.google_header_address);
switch (tab.getPosition())
{
case 0:
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setVisibility(View.VISIBLE);
google_header_address.setText("");
ClearFragmentStack();
Toast.makeText(context,"title"+String.valueOf((int)getResources().getDimension(R.dimen.text_size_bw_small)),Toast.LENGTH_LONG).show();
break;
case 1:
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab2 title");
ClearFragmentStack();
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
case 2:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab3 title ");
Toast.makeText(context,"title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)),Toast.LENGTH_LONG).show();
break;
case 3:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab4 title");
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
case 4:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab5 title");
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
}
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
linearLayout=(LinearLayout)tab.getCustomView();
ImageView v=(ImageView)linearLayout.getChildAt(0);
v.setColorFilter(Color.parseColor("#ffffff"), PorterDuff.Mode.SRC_IN);
TextView google_header_address=(TextView)findViewById(R.id.google_header_address);
google_header_address.setText("");
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
linearLayout=(LinearLayout)tab.getCustomView();
ImageView v=(ImageView)linearLayout.getChildAt(0);
v.setColorFilter(Color.parseColor("#f6fda6"), PorterDuff.Mode.SRC_IN);
TextView google_header_address=(TextView)findViewById(R.id.google_header_address);
switch (tab.getPosition())
{
case 0:
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setVisibility(View.VISIBLE);
google_header_address.setText("");
ClearFragmentStack();
Toast.makeText(context,"title"+String.valueOf((int)getResources().getDimension(R.dimen.text_size_bw_small)),Toast.LENGTH_LONG).show();
break;
case 1:
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab2 title");
ClearFragmentStack();
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
case 2:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab3 title");
Toast.makeText(context,"title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)),Toast.LENGTH_LONG).show();
break;
case 3:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab4 title");
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
case 4:
ClearFragmentStack();
Log.d("Position", String.valueOf(tab.getPosition()));
google_header_address.setText("tab5 title");
Log.i("bwSmall", "title"+String.valueOf((int)getResources().getDimension(R.dimen.mtext_size_button)));
break;
}
}
});
}
private void ClearFragmentStack() {
FragmentManager fm = getSupportFragmentManager();
for(int i = 0; i < fm.getBackStackEntryCount(); ++i) {
fm.popBackStack();
}
}
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 addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public View getCustomView(TabLayout tabLayout,int position){
View view = LayoutInflater.from(getApplicationContext())
.inflate(R.layout.custom_tab, tabLayout, false);
TextView textView= (TextView) view.findViewById(R.id.tabText);
textView.setText(getPageTitle(position));
textView.setTypeface(tf);
ImageView imageView = (ImageView) view.findViewById(R.id.imageView);
imageView.setImageResource(tabIcons[position]);
return view;
}
public View getTabView(TabLayout tabLayout,int position) {
// Given you have a custom layout in `res/layout/custom_tab.xml` with a TextView and ImageView
View view = LayoutInflater.from(getApplicationContext())
.inflate(R.layout.custom_tab, tabLayout, false);
TextView textView= (TextView) view.findViewById(R.id.tabText);
textView.setText(getPageTitle(position));
textView.setTypeface(tf);
ImageView imageView = (ImageView) view.findViewById(R.id.imageView);
imageView.setImageResource(tabIcons[position]);
return view;
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
//Caligraphy Library
@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
这就是我在第一个选项卡中所做的一切，其中包含我在标题中使用的产品地址，并在地图上显示当前位置。
public class _step1_mapfragment extends Fragment {
MapView mMapView;
private GoogleMap googleMap;
public static boolean Stop_searcLocation=true;
public LatLng GetCurrentLocation;
public ImageView IV_title;
public ImageView IV_marker;
private static final int PICK_IMAGE_ID = 234;
private String FilePath;
public String FIleName = "images.jpg";
ImageView Prescription_img;
// directory name to store captured images and videos
public _step1_mapfragment() {
// Required empty public constructor
}
Uri file;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView= inflater.inflate(R.layout.fragment__step1_mapfragment, container, false);
Change_MarkerImage(rootView);
Control_Map(savedInstanceState,rootView);
GeocodeAsyncTask AddressTask=new GeocodeAsyncTask(UIHelper.Latitude,
UIHelper.Logitude);
AddressTask.execute();
FilePath=getActivity().getFilesDir().getParentFile().getPath() + "/files/";
try {
copyfile(getActivity());
} catch (IOException e) {
e.printStackTrace();
}
File f = new File(FilePath + FIleName);
Log.d("FileName:",f.getName());
Prescription_img= (ImageView) getActivity().findViewById(R.id.prescription);
ClearFragmentStack();
fav_GetAddress(rootView);
return rootView;
}
private void ClearFragmentStack() {
FragmentManager fm = getActivity().getSupportFragmentManager();
for(int i = 0; i < fm.getBackStackEntryCount(); ++i) {
fm.popBackStack();
}
}
private void Change_MarkerImage(final View rootView) {
IV_marker = (ImageView) rootView.findViewById(R.id.confirm_address_map_custom_marker);
IV_title = (ImageView) rootView.findViewById(R.id.Image_title);
IV_marker.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
IV_marker.setImageResource(R.drawable.ic_new_mark_icon);
IV_title.setVisibility(View.VISIBLE);
}
});
IV_title.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getActivity(),"Clicked well",Toast.LENGTH_LONG).show();
/* checksCameraPermission(view);*/
IV_title.setVisibility(View.GONE);
TakeImage();
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 100) {
if (resultCode == -1) {
Bundle args=new Bundle();
// I'll assume this is a Context and bitmap is a Bitmap
File fileUrl=new File(file.getPath());
args.putString("image",fileUrl.getAbsolutePath());
_step2_fragmentconfirm_pic confirmPicFragment=new _step2_fragmentconfirm_pic();
confirmPicFragment.setArguments(args);
Toast.makeText(getActivity(),"getting image ready",Toast.LENGTH_LONG).show();
FragmentTransaction transaction=getFragmentManager().beginTransaction();
transaction.replace(R.id.root_menu_fragment,confirmPicFragment);
transaction.addToBackStack("mapView");
transaction.commit();
Toast.makeText(getActivity(), "Everything is ok but frag error is the case", Toast.LENGTH_SHORT).show();
}
}
}
public void copyfile(Context context) throws IOException {
Log.d("File Path:",FilePath);
InputStream myInput=context.getAssets().open(FIleName);
String outFileName=FilePath+FIleName;
OutputStream myOutPut=new FileOutputStream(outFileName);
byte[] buffer=new byte[1024];
int length;
while ((length=myInput.read(buffer))>0)
{
myOutPut.write(buffer,0,length);
}
myOutPut.flush();
myOutPut.close();
myInput.close();
}
private void TakeImage() {
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(), new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
}
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
file = Uri.fromFile(ImagePicker.getTempFile(getActivity()));
} catch (Exception e) {
e.printStackTrace();
}
intent.putExtra(MediaStore.EXTRA_OUTPUT, file);
startActivityForResult(intent, 100);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == 0) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
&& grantResults[1] == PackageManager.PERMISSION_GRANTED) {
TakeImage();
}
}
}
@Override
public void onResume() {
super.onResume();
Stop_searcLocation=true;
mMapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
private void Control_Map(Bundle savedInstanceState, View rootView) {
mMapView = (MapView) rootView.findViewById(R.id.mapView);
mMapView.onCreate(savedInstanceState);
mMapView.onResume(); // needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
mMapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap mMap) {
googleMap = mMap;
googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
}
});
googleMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
@Override
public void onCameraChange(CameraPosition cameraPosition) {
UIHelper.Latitude=cameraPosition.target.latitude;
UIHelper.Logitude=cameraPosition.target.longitude;
GeocodeAsyncTask AddressTask=new GeocodeAsyncTask(cameraPosition.target.latitude,
cameraPosition.target.longitude);
AddressTask.execute();
}
});
// For showing a move to my location button
if(ContextCompat.checkSelfPermission(getActivity(),
android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION)==
PackageManager.PERMISSION_GRANTED){
googleMap.setMyLocationEnabled(true);
} else
{
ActivityCompat.requestPermissions(getActivity(),new String[]{
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
},1);
}
// For dropping a marker at a point on the Map
googleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location location) {
{
Stop_searcLocation=false;
GetCurrentLocation = new LatLng(location.getLatitude(), location.getLongitude());
Toast.makeText(getActivity(), "Set Location", Toast.LENGTH_SHORT).show();
CameraPosition cameraPosition = new CameraPosition.Builder().target(GetCurrentLocation).zoom(18).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
}
});
}
});
}
class GeocodeAsyncTask extends AsyncTask<Void, Void, Address> {
double strLatitude;
double strLongitude;
public GeocodeAsyncTask(double strLatitude, double strLongitude){
this.strLatitude=strLatitude;
this.strLongitude=strLongitude;
}
String errorMessage = "";
@Override
protected void onPreExecute() {
}
@Override
protected Address doInBackground(Void ... none) {
Log.i("Started","start one");
Locale.setDefault(new Locale("fa"));
Geocoder geocoder = new Geocoder(getActivity(), Locale.getDefault());
List<Address> addresses = null;
double latitude = strLatitude;
double longitude = strLongitude;
try {
addresses = geocoder.getFromLocation(latitude, longitude, 1);
} catch (IOException ioException) {
errorMessage = "Service Not Available";
} catch (IllegalArgumentException illegalArgumentException) {
errorMessage = "Invalid Latitude or Longitude Used";
}
if(addresses != null && addresses.size() > 0) {
Log.i("Started", "start two");
return addresses.get(0);
}
return null;
}
protected void onPostExecute(Address address) {
Locale.setDefault(new Locale("fa"));
Log.i("Started","start three");
if(address == null) {
}
else {
Log.i("Started","start four");
String addressName = "";
for(int i = 0; i < address.getMaxAddressLineIndex(); i++) {
if(i==0)
addressName += address.getAddressLine(i);
else
addressName += "،" + address.getAddressLine(i);
}
Log.i("Started", String.valueOf(address.getMaxAddressLineIndex()));
Locale.setDefault(new Locale("fa"));
UIHelper.setTvText(getActivity(), R.id.google_header_address, addressName);
}
}
}
public void fav_GetAddress(View view){
final Dialog dialog = new Dialog(getActivity());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.alert_dialog_custom);
dialog.getWindow().setBackgroundDrawableResource(R.drawable.draw_radius_cost_info);
// set the custom dialog components - text, image and button
TextView dialogButton = (TextView) dialog.findViewById(R.id.dialogOK);
// if button is clicked, close the custom dialog
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
LinearLayout imageView=(LinearLayout)view.findViewById(R.id.fav_GetAddress);
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.show();
}
});
// custom dialog
}
一种更简单的方法是使用 EventBus 。这允许 publish-subscribe-style 组件之间的通信，而不需要组件显式地相互注册（从而相互了解）。它专为使用显式注册取代传统的 Java in-process 事件分发而设计。为了在 Android 中使用 EventBus，请在 gradle（应用级别）中添加：
compile 'org.greenrobot:eventbus:3.0.0'
现在您需要创建一个 Event 。一个事件只是一个对象，它是从总线上的发送者 post 发送的，并将传递给任何订阅相同事件类型的接收者 class。而已！。因此，为此我们将创建一个示例 Event class:
public class HelloWorldEvent {
private final String message;
public HelloWorldEvent(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
}
现在下一步是创建一个 Sender 。这允许您从整个 Android 应用程序的任何部分 post 任何事件。因此，在您的情况下，您可以从 Fragments、viewpager 等发送。这就是你的做法：
EventBus.getDefault().post(new HelloWorldEvent("Hello EventBus!”);
所以这会发送一个新的 event，但是为了接收它，您需要有人接收它。因此，为了从任何 activity 中收听，从您的 activity class 中说，首先您需要注册它：
EventBus.getDefault().register(this);
然后在class里面定义一个新方法：
// This method will be called when a HelloWorldEvent is posted
@Subscribe
public void onEvent(HelloWorldEvent event){
// your implementation
Toast.makeText(getActivity(), event.getMessage(), Toast.LENGTH_SHORT).show();
}
因此，无论何时发送 Event，都会被 receiver 接收。因此，您可以创建一个 Event 并向其添加多个侦听器。它会正常工作，如下图所示：
有关 EventBus 库的更多信息可在此处获取：
此处提供了有关 EventBus 的更简单的教程：