Question

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：

MainActivity

MapFragment：

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： enter image description here

我得到的另一个错误：当我点击你两次时会发生这种情况 enter image description here

Answer 1

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();

}

来自Map Fragment的

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

无法恢复活动NULL POINTER EXCEPTION＆amp;膨胀类片段时出错？

1 个答案: