无法恢复活动NULL POINTER EXCEPTION＆amp;膨胀类片段时出错？
你好我们有关于地图片段的问题，我已经将谷歌地图集成到一个由抽屉主要活动调用的片段
问题是，当我再次点击你显示地图片段的应用程序崩溃时，在下面的代码中你会找到主要活动主页片段，它是地图片段，xml布局和{{1任何帮助都非常感谢提前感谢
logcat：
MainActivityMapFragment：
package info.androidhive.slidingmenu;
import info.androidhive.slidingmenu.adapter.NavDrawerListAdapter;
import info.androidhive.slidingmenu.model.NavDrawerItem;
import java.util.ArrayList;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.PopupMenu;
import android.widget.Toast;
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private static int lastClicked = 0;
public static int filterListFunc = 1;
// nav drawer title
private CharSequence mDrawerTitle;
// static var to change filter functionality
public static int filterFunc;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons
.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons
.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons
.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons
.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons
.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons
.getResourceId(5, -1), true, "50+"));
// Recycle the typed array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and behaving it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, // nav menu toggle icon
R.string.app_name, // nav drawer open - description for
// accessibility
R.string.app_name // nav drawer close - description for
// accessibility
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected nav drawer item
if (lastClicked == position) {
lastClicked = position;
mDrawerLayout.closeDrawers();
}
displayView(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_normal:
HomeFragment.setMapType("normal");
return true;
case R.id.action_hyprid:
HomeFragment.setMapType("hyprid");
return true;
case R.id.action_satellite:
HomeFragment.setMapType("satellite");
return true;
case R.id.action_terrain:
HomeFragment.setMapType("terrain");
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* *
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_normal).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
/**
* Diplaying fragment view for selected nav drawer list item
* */
@SuppressLint("NewApi")
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
filterFunc = 1;
fragment = new HomeFragment();
mDrawerLayout.closeDrawers();
break;
case 1:
PopupMenu popup = new PopupMenu(getApplicationContext(),
mDrawerList.getChildAt(1), Gravity.RIGHT + Gravity.RIGHT);
// Inflating the Popup using xml file
popup.getMenuInflater()
.inflate(R.menu.poupup_menu, popup.getMenu());
// registering popup with OnMenuItemClickListener
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
if (filterFunc == 1) {
Toast.makeText(getApplicationContext(),
"You Clicked : " + item.getTitle(),
Toast.LENGTH_SHORT).show();
return true;
} else if (filterFunc == 2) {
if (item.getTitle().equals("Employees")) {
filterListFunc = 1;
Fragment fragment = new PhotosFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment)
.commit();
mDrawerLayout.closeDrawers();
return true;
} else if (item.getTitle().equals("Tickets")) {
filterListFunc = 2;
Fragment fragment = new PhotosFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment)
.commit();
mDrawerLayout.closeDrawers();
return true;
}
}
return false;
}
});
popup.show();// showing popup menu
mDrawerList.getChildAt(0).setClickable(false);
break;
case 2:
filterFunc = 2;
fragment = new PhotosFragment();
mDrawerLayout.closeDrawers();
break;
case 3:
filterFunc = 0;
fragment = new CommunityFragment();
mDrawerLayout.closeDrawers();
break;
case 4:
filterFunc = 0;
fragment = new PagesFragment();
mDrawerLayout.closeDrawers();
break;
case 5:
filterFunc = 0;
fragment = new WhatsHotFragment();
mDrawerLayout.closeDrawers();
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
} else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
XML：
package info.androidhive.slidingmenu;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnInfoWindowClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.internal.f;
import android.app.Fragment;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
public class HomeFragment extends Fragment {
// latitude and longitude of an employee just demonstration
// static var get byte image changes into image adapter
public static byte[] iconEmp;
public static Bitmap bitmapfree;
public static Bitmap bitmapBusy;
public static byte[] bitMapData;
public static byte[] bitMapData2;
// Google Map
static GoogleMap googleMap;
public HomeFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container,
false);
// MainActivity e = new MainActivity();
try {
// Loading map
initilizeMap();
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
} catch (Exception ee) {
ee.printStackTrace();
}
return rootView;
}
@Override
public void onResume() {
super.onResume();
initilizeMap();
}
/**
* function to load map If map is not created it will create it for you
* */
void initilizeMap() {
googleMap = ((MapFragment) getFragmentManager().findFragmentById(
R.id.map)).getMap();
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getActivity(), "Sorry! unable to create maps",
Toast.LENGTH_SHORT).show();
}
// ///----------------------------------Zooming camera to position
// user-----------------
LocationManager locationManager = (LocationManager) getActivity()
.getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
Location location = locationManager
.getLastKnownLocation(locationManager.getBestProvider(criteria,
false));
if (location != null) {
googleMap
.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location
.getLongitude()), 13));
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(location.getLatitude(), location
.getLongitude())) // Sets the center of the map to
// location user
.zoom(14) // Sets the zoom
.bearing(90) // Sets the orientation of the camera to east
.tilt(40) // Sets the tilt of the camera to 30 degrees
.build(); // Creates a CameraPosition from the builder
googleMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
}
// -------------------Zooming camera to position
// user-----------------
googleMap.setMyLocationEnabled(true);
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
// def employee marker depending on a certain location
// def tickets marker in a certain location
Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.free);
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
bitMapData = stream.toByteArray();
Drawable drawable2 = res.getDrawable(R.drawable.buzy);
Bitmap bitmap2 = ((BitmapDrawable) drawable2).getBitmap();
ByteArrayOutputStream stream2 = new ByteArrayOutputStream();
bitmap2.compress(Bitmap.CompressFormat.JPEG, 100, stream2);
bitMapData2 = stream2.toByteArray();
// fill employee data
Employee emp = new Employee("1", "noor ahmad", "Routine", "0796548755",
"Free", 31.0000, 35.0000, "123");
Employee emp1 = new Employee("2", "ahmad mohammed", "Repair",
"0796556457", "NotFree", 31.9869, 35.8715, "123");
Employee emp2 = new Employee("3", "thaer abdullah",
"Preventive Maintenance", "0785461444", "NotFree", 31.9885,
35.8481, "123");
ArrayList<Employee> e = new ArrayList<Employee>();
e.add(emp);
e.add(emp1);
e.add(emp2);
// def ticket's images
Drawable drawableFixed = res.getDrawable(R.drawable.fixed);
Bitmap bitmapFixed = ((BitmapDrawable) drawableFixed).getBitmap();
Drawable drawableunFixed = res.getDrawable(R.drawable.unfixed);
Bitmap bitmapunFixed = ((BitmapDrawable) drawableunFixed).getBitmap();
Drawable drawableUnderM = res.getDrawable(R.drawable.underm);
Bitmap bitmapUnderM = ((BitmapDrawable) drawableUnderM).getBitmap();
// fill tickets data
Tickets tic = new Tickets(1, 1, 1, "Preventive_Maintenance", "",
31.9935, 35.8532, "5/2/2015", "fixed");
Tickets tic1 = new Tickets(2, 2, 2, "Repair", "not working", 31.9920,
35.8540, "5/2/2015", "unfixed");
Tickets tic2 = new Tickets(3, 3, 3, "Preventive_Maintenance", "",
31.9923, 35.8459, "5/2/2015", "under maintainance");
ArrayList<Tickets> t = new ArrayList<Tickets>();
t.add(tic);
t.add(tic1);
t.add(tic2);
// loop around employees and insert markers into the map
for (Employee e1 : e) {
MarkerOptions markerT = new MarkerOptions().position(
new LatLng(e1.getEmpLatitude(), e1.getEmpLongitude()))
.title(e1.getEmpName());
// Changing marker icon
bitmapfree = BitmapFactory.decodeByteArray(bitMapData, 0,
bitMapData.length);
bitmapBusy = BitmapFactory.decodeByteArray(bitMapData2, 0,
bitMapData2.length);
bitmapfree = eraseColor(bitmap, -16777216);
bitmapBusy = eraseColor(bitmap2, -16777216);
if (e1.getEmpWorkState().equals("NotFree")) {
iconEmp = bitMapData2;
markerT.icon(BitmapDescriptorFactory.fromBitmap(bitmapBusy));
} else if (e1.getEmpWorkState().equals("Free")) {
iconEmp = bitMapData;
markerT.icon(BitmapDescriptorFactory.fromBitmap(bitmapfree));
}
// adding employee marker to the map
googleMap.addMarker(markerT);
}
// loop around tickets and insert markers into the map
for (Tickets t1 : t) {
MarkerOptions markerT = new MarkerOptions()
.position(
new LatLng(t1.getTicketLatitude(), t1
.getTicketlongitude())).title(
t1.getTicketCategory());
// Changing marker icon
if (t1.getTicketState().equals("fixed")) {
markerT.icon(BitmapDescriptorFactory.fromBitmap(bitmapFixed));
} else if (t1.getTicketState().equals("unfixed")) {
markerT.icon(BitmapDescriptorFactory.fromBitmap(bitmapunFixed));
} else if (t1.getTicketState().equals("under maintainance")) {
markerT.icon(BitmapDescriptorFactory.fromBitmap(bitmapUnderM));
}
// adding employee marker to the map
googleMap.addMarker(markerT);
}
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
}
@Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
Fragment fragment = (getFragmentManager().findFragmentById(R.id.map));
android.app.FragmentTransaction ft = getActivity().getFragmentManager()
.beginTransaction();
ft.remove(fragment);
ft.commit();
}
@Override
public void onDestroyView() {
super.onDestroyView();
Fragment fragment = (getFragmentManager().findFragmentById(R.id.map));
android.app.FragmentTransaction ft = getActivity().getFragmentManager()
.beginTransaction();
ft.remove(fragment);
ft.commit();
}
public static void setMapType(String n) {
if (n == "normal") {
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
} else if (n == "hyprid") {
googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
} else if (n == "satellite") {
googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
} else if (n == "terrain") {
googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
}
}
// erase bitmap background black
public static Bitmap eraseColor(Bitmap src, int color) {
int width = src.getWidth();
int height = src.getHeight();
Bitmap b = src.copy(Config.ARGB_8888, true);
b.setHasAlpha(true);
int[] pixels = new int[width * height];
src.getPixels(pixels, 0, width, 0, 0, width, height);
for (int i = 0; i < width * height; i++) {
if (pixels[i] == color) {
pixels[i] = 0;
}
}
b.setPixels(pixels, 0, width, 0, 0, width, height);
return b;
}
}
logcat的：
我得到的另一个错误：当我点击你两次时会发生这种情况
1 个答案:
答案 0 :(得分：0)
我找到了这两个问题的解决方案，所以第一个： 1-null指针异常无法恢复活动，当我将手机方向从横向更改为纵向时，解决方案是：删除 -
@Override
public void onPause() {
// TODO Auto-generated method stub
super.onPause();
Fragment fragment = (getFragmentManager().findFragmentById(R.id.map));
android.app.FragmentTransaction ft = getActivity().getFragmentManager()
.beginTransaction();
ft.remove(fragment);
ft.commit();
}
@Override
public void onDestroyView() {
super.onDestroyView();
Fragment fragment = (getFragmentManager().findFragmentById(R.id.map));
android.app.FragmentTransaction ft = getActivity().getFragmentManager()
.beginTransaction();
ft.remove(fragment);
ft.commit();
}
2 - 第二个是错误膨胀类片段，它导致重复“调用地图片段两次并加载两次”，我找到的解决方案是创建一个if语句来控制加载过程：
if(HomeFragment.googleMap != null){
LocationManager locationManager = (LocationManager)getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
Location location = locationManager
.getLastKnownLocation(locationManager.getBestProvider(criteria,
false));
if (location != null) {
HomeFragment.googleMap
.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(), location
.getLongitude()), 13));
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(location.getLatitude(), location
.getLongitude())) // Sets the center of the map to
// location user
.zoom(14) // Sets the zoom
.bearing(0) // Sets the orientation of the camera to east
.tilt(40) // Sets the tilt of the camera to 30 degrees
.build(); // Creates a CameraPosition from the builder
HomeFragment.googleMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
}
}else{
fragment = new HomeFragment();}
mDrawerLayout.closeDrawers();
break;
在其他情况下我添加了
HomeFragment.googleMap = null;
如果案件导致另一个片段，如果不是，我只是让它。 希望这会有助于他人。 谢谢
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