我正面临使用GoogleMap的新问题。在安装了NavigationDrawer之后，我为GoogleMap创建了一个新的Fragment，它从Drawer菜单中调用。
我确实实现了KeyDown过程，使用音量按钮将Map视图类型从Hybrid切换到Normal，反之亦然。
因此，当我点击这些latters进行切换时，即使在我的智能手机上，应用程序也会崩溃。
你对这类问题有任何想法吗？
最好的问候。
logcat：
04-24 10:52:47.101: I/dalvikvm(627): threadid=3: reacting to signal 3
04-24 10:52:47.161: I/dalvikvm(627): Wrote stack traces to '/data/anr/traces.txt'
04-24 10:52:47.311: D/libEGL(627): loaded /system/lib/egl/libGLES_android.so
04-24 10:52:47.321: I/dalvikvm(627): threadid=3: reacting to signal 3
04-24 10:52:47.391: D/libEGL(627): loaded /system/lib/egl/libEGL_emulation.so
04-24 10:52:47.401: D/(627): HostConnection::get() New Host Connection established 0x13a9f8, tid 627
04-24 10:52:47.401: I/dalvikvm(627): Wrote stack traces to '/data/anr/traces.txt'
04-24 10:52:47.413: D/libEGL(627): loaded /system/lib/egl/libGLESv1_CM_emulation.so
04-24 10:52:47.413: D/libEGL(627): loaded /system/lib/egl/libGLESv2_emulation.so
04-24 10:52:47.642: W/EGL_emulation(627): eglSurfaceAttrib not implemented
04-24 10:52:47.661: D/OpenGLRenderer(627): Enabling debug mode 0
04-24 10:52:47.946: I/dalvikvm(627): threadid=3: reacting to signal 3
04-24 10:52:47.951: I/dalvikvm(627): Wrote stack traces to '/data/anr/traces.txt'
04-24 10:52:48.281: I/dalvikvm(627): threadid=3: reacting to signal 3
04-24 10:52:48.321: I/dalvikvm(627): Wrote stack traces to '/data/anr/traces.txt'
04-24 10:53:04.621: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.631: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.631: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.641: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.651: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.661: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.671: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.671: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.681: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.701: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.711: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.721: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.732: W/GooglePlayServicesUtil(627): Google Play services is missing.
04-24 10:53:04.732: W/System.err(627): java.lang.NullPointerException
04-24 10:53:04.741: W/System.err(627): at app.track.map.MainActivity$GoogleMapFragment.initilizeMap(MainActivity.java:258)
04-24 10:53:04.741: W/System.err(627): at app.track.map.MainActivity$GoogleMapFragment.onCreateView(MainActivity.java:241)
04-24 10:53:04.741: W/System.err(627): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:828)
04-24 10:53:04.741: W/System.err(627): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1032)
04-24 10:53:04.751: W/System.err(627): at android.app.BackStackRecord.run(BackStackRecord.java:622)
04-24 10:53:04.751: W/System.err(627): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1382)
04-24 10:53:04.751: W/System.err(627): at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)
04-24 10:53:04.751: W/System.err(627): at android.os.Handler.handleCallback(Handler.java:605)
04-24 10:53:04.751: W/System.err(627): at android.os.Handler.dispatchMessage(Handler.java:92)
04-24 10:53:04.751: W/System.err(627): at android.os.Looper.loop(Looper.java:137)
04-24 10:53:04.751: W/System.err(627): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-24 10:53:04.761: W/System.err(627): at java.lang.reflect.Method.invokeNative(Native Method)
04-24 10:53:04.761: W/System.err(627): at java.lang.reflect.Method.invoke(Method.java:511)
04-24 10:53:04.761: W/System.err(627): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-24 10:53:04.761: W/System.err(627): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-24 10:53:04.771: W/System.err(627): at dalvik.system.NativeStart.main(Native Method)
04-24 10:53:07.231: D/AndroidRuntime(627): Shutting down VM
04-24 10:53:07.231: W/dalvikvm(627): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
04-24 10:53:07.331: E/AndroidRuntime(627): FATAL EXCEPTION: main
04-24 10:53:07.331: E/AndroidRuntime(627): java.lang.NullPointerException
04-24 10:53:07.331: E/AndroidRuntime(627): at app.track.map.MainActivity.onKeyDown(MainActivity.java:219)
04-24 10:53:07.331: E/AndroidRuntime(627): at android.view.KeyEvent.dispatch(KeyEvent.java:2551)
04-24 10:53:07.331: E/AndroidRuntime(627): at android.app.Activity.dispatchKeyEvent(Activity.java:2329)
04-24 10:53:07.331: E/AndroidRuntime(627): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1806)
04-24 10:53:07.331: E/AndroidRuntime(627): at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3327)
04-24 10:53:07.331: E/AndroidRuntime(627): at android.view.ViewRootImpl.handleFinishedEvent(ViewRootImpl.java:3300)
04-24 10:53:07.331: E/AndroidRuntime(627): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2460)
04-24 10:53:07.331: E/AndroidRuntime(627): at android.os.Handler.dispatchMessage(Handler.java:99)
04-24 10:53:07.331: E/AndroidRuntime(627): at android.os.Looper.loop(Looper.java:137)
04-24 10:53:07.331: E/AndroidRuntime(627): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-24 10:53:07.331: E/AndroidRuntime(627): at java.lang.reflect.Method.invokeNative(Native Method)
04-24 10:53:07.331: E/AndroidRuntime(627): at java.lang.reflect.Method.invoke(Method.java:511)
04-24 10:53:07.331: E/AndroidRuntime(627): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-24 10:53:07.331: E/AndroidRuntime(627): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-24 10:53:07.331: E/AndroidRuntime(627): at dalvik.system.NativeStart.main(Native Method)
04-24 10:53:07.561: D/dalvikvm(627): GC_CONCURRENT freed 206K, 4% free 9300K/9607K, paused 4ms+6ms
04-24 10:53:07.982: I/dalvikvm(627): threadid=3: reacting to signal 3
04-24 10:53:08.011: I/dalvikvm(627): Wrote stack traces to '/data/anr/traces.txt'
04-24 10:53:09.441: I/Process(627): Sending signal. PID: 627 SIG: 9
MainActivity：
/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package app.track.map;
import java.util.Locale;
import com.google.android.gms.maps.CameraUpdateFactory;
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.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.SearchManager;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mPlanetTitles;
// Google Map
private GoogleMap googleMap;
private static String SelectedMenuPosition;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
mPlanetTitles = getResources().getStringArray(R.array.drawer_array);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mPlanetTitles));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// enable ActionBar app icon to behave as action to toggle nav drawer
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.map, menu);
return super.onCreateOptionsMenu(menu);
}
/* Called whenever we call invalidateOptionsMenu() */
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// If the nav drawer is open, hide action items related to the content view
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
// ActionBarDrawerToggle will take care of this.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action buttons
switch(item.getItemId()) {
case R.id.action_websearch:
// create intent to perform web search for this planet
Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);
intent.putExtra(SearchManager.QUERY, getActionBar().getTitle());
// catch event that there's no activity to handle intent
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(intent);
} else {
Toast.makeText(this, R.string.app_not_available, Toast.LENGTH_LONG).show();
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/* The click listner for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
}
private void selectItem(int position) {
SelectedMenuPosition = getResources().getStringArray(R.array.drawer_array)[position];
// update the main content by replacing fragments
if ( position == 2){
Fragment fragment = new GoogleMapFragment();
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mPlanetTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
else if( position == 3){
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mPlanetTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
else
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mPlanetTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
@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);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(SelectedMenuPosition.equals("Navigate")){
if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
return true;
}
else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
return true;
}
}
return super.onKeyDown(keyCode, event);
}
GoogleMapFragment
public static class GoogleMapFragment extends Fragment {
// Google Map
private GoogleMap googleMap;
public GoogleMapFragment() {
// Empty constructor required for fragment subclasses
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_map, container, false);
try {
// Loading map
initilizeMap();
} catch (Exception e) {
e.printStackTrace();
}
getActivity().setTitle(SelectedMenuPosition);
return rootView;
}
/**
* function to load map. If map is not created it will create it for you
* */
private void initilizeMap() {
if (googleMap == null) {
googleMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
googleMap.getUiSettings().setCompassEnabled(true);
googleMap.getUiSettings().setRotateGesturesEnabled(true);
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
googleMap.setMyLocationEnabled(true);
LatLng sydney = new LatLng(-33.867, 151.206);
googleMap.setMyLocationEnabled(true);
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 13));
googleMap.addMarker(new MarkerOptions()
.title("Sydney")
.snippet("The most populous city in Australia.")
.position(sydney));
// check if map is created successfully or not
if (googleMap == null) {
//Toast.makeText(getApplicationContext(),"Sorry! unable to create maps", Toast.LENGTH_SHORT).show();
}
}
}
}
}
答案 0 :(得分：0)
在清单
中添加此内容 <meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
答案 1 :(得分：0)
您尝试设置NullPointer类型的onKeyDown方法出现GoogleMap错误。而您忘记在GoogleMap方法中初始化onCreate()，这就是应用崩溃的原因。
只需在课堂上初始化GoogleMap googleMap即可。