我在谷歌地图的 map 中显示 fragment 时遇到以下问题，我需要在 Android API 24 上工作，如果它工作的话，就像以前的版本一样。
错误在 Fragment MapRestaurante 行中:
getFmMain().getSupportFragmentManager().beginTransaction().add(R.id.activitymap, mMapFragment).commit()
如果我使用这条线同样的问题:
getChildFragmentManager().beginTransaction().add(R.id.activitymap, mMapFragment).commit();
Android 监视器
> FATAL EXCEPTION: main
Process: com.jungle, PID: 4356
java.lang.IllegalStateException: Fragment null must be a public static class to be properly recreated from instance state.
at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:435)
at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:420)
at com.jungle.MapRestaurant.onCreateView(MapRestaurant.java:72)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1638)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:679)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:166)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1240)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1088)
at android.support.v4.view.ViewPager.setAdapter(ViewPager.java:542)
at com.jungle.MainActivity.Setup(MainActivity.java:167)
at com.jungle.MainActivity.access$000(MainActivity.java:34)
at com.jungle.MainActivity$1.onClick(MainActivity.java:61)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
关闭 MainActivity
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
viewPager = (ViewPager) super.findViewById(R.id.viewpager);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
Button btnRestaurant = (Button) findViewById(R.id.btnRestaurant);
btnRestaurant.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Setup(1);
}
});
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
public void maphotel(View v){
//Intent intent = new Intent(this,MapRestaurant.class);
//startActivity(intent);
Setup(2);
}
public void mapthingsdo(View v){
//Intent intent = new Intent(this,MapRestaurant.class);
//startActivity(intent);
Setup(3);
}
public FrameLayout getFrameContainer(){
FrameLayout fm = (FrameLayout) findViewById(R.id.fragment_container);
return fm;
}
private void Setup(int id){
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
switch (id){
case 1:
if(adapter.getmFragmentTitleList().size() > 0) {
adapter.getmFragmentTitleList().clear();
}
adapter.addFragment(new MapRestaurant(this), null);
adapter.notifyDataSetChanged();
break;
case 2:
if(adapter.getmFragmentTitleList().size() > 0) {
adapter.getmFragmentTitleList().clear();
}
adapter.addFragment(new MapHotel(this), null);
adapter.notifyDataSetChanged();
break;
case 3:
if(adapter.getmFragmentTitleList().size() > 0) {
adapter.getmFragmentTitleList().clear();
}
adapter.addFragment(new MapThingstodo(this), null);
adapter.notifyDataSetChanged();
break;
}
viewPager.setAdapter(adapter);
}
//Clase para visualizar los fragmentos y los tabs en el viewpager
class ViewPagerAdapter extends FragmentStatePagerAdapter {
private List<Fragment> mFragmentList = new ArrayList<>();
private List<String> mFragmentTitleList = new ArrayList<>();
public List<String> getmFragmentTitleList() {
return mFragmentTitleList;
}
public List<Fragment> getmFragmentList() {
return mFragmentList;
}
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);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
//this is called when notifyDataSetChanged() is called
@Override
public int getItemPosition(Object object) {
// refresh all fragments when data set changed
return POSITION_NONE;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
if (position >= getCount()) {
FragmentManager manager = ((Fragment) object).getFragmentManager();
FragmentTransaction trans = manager.beginTransaction();
trans.remove((Fragment) object);
trans.commit();
}
}
}
}
Fragment MapRestaturant
public class MapRestaurant extends Fragment implements OnMapReadyCallback {
private GoogleMap mMap;
private SupportMapFragment mMapFragment;
static Context contexto;
private MainActivity fmMain;
@SuppressLint("ValidFragment")
public MapRestaurant(MainActivity fmMain) {
this.fmMain = fmMain;
}
public MainActivity getFmMain() {
return fmMain;
}
public void setFmMain(MainActivity fmMain) {
this.fmMain = fmMain;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_maps, container, false);
mMapFragment = new SupportMapFragment() {
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
};
contexto = v.getContext();
mMapFragment.getMapAsync(this);
//getChildFragmentManager().beginTransaction().add(R.id.activitymap, mMapFragment).commit();
getFmMain().getSupportFragmentManager().beginTransaction().add(R.id.activitymap, mMapFragment).commit();//aqui es donde me tira el error
return v;
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (ContextCompat.checkSelfPermission(contexto, Manifest.permission.ACCESS_COARSE_LOCATION)== PackageManager.PERMISSION_GRANTED) {
mMap.setMyLocationEnabled(true);
}
mMap.addMarker(new MarkerOptions().position(new LatLng( -25.598303, -54.575627)).title("Angelo Resto Bar Restaurant")).setIcon(BitmapDescriptorFactory.fromResource(R.drawable.restaurant));
mMap.addMarker(new MarkerOptions().position(new LatLng( -25.598265, -54.575681)).title("Restaurante II Frantello")).setIcon(BitmapDescriptorFactory.fromResource(R.drawable.restaurant));
mMap.addMarker(new MarkerOptions().position(new LatLng( -25.598806, -54.575069)).title("La Tata Restaurante")).setIcon(BitmapDescriptorFactory.fromResource(R.drawable.restaurant));
mMap.moveCamera(CameraUpdateFactory.newLatLng(new LatLng(-25.598806, -54.575069)));
mMap.moveCamera(CameraUpdateFactory.zoomTo(9));
mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
@Override
public void onInfoWindowClick(Marker marker) {
NotifPopUp firstFragment = new NotifPopUp();
fmMain.getSupportFragmentManager().beginTransaction().add(getFmMain().getFrameContainer().getId(), firstFragment).commit();
}
});
}
}
谢谢!!!
最佳答案
摆脱:
@SuppressLint("ValidFragment") public MapRestaurant(MainActivity fmMain) { this.fmMain = fmMain; } public MainActivity getFmMain() { return fmMain; } public void setFmMain(MainActivity fmMain) { this.fmMain = fmMain; }
Android 会为您保留该引用。使用 getActivity()检索主机 Activity .同样的事情适用于 contexto = v.getContext(); .
改变
getFmMain().getSupportFragmentManager()
与 getFragmentManager() .如果您确实导入了 Fragment来自支持库，在 Fragment 中的子类，getFragmentManager() , 返回 FragmentManager 的支持版本.不需要魔法
关于java - 非法状态异常 : Fragment null must be a public static class to be properly recreated from instance state，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39532999/