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我是Android開發新手。我正在嘗試製作一個應用程序，其中列出了各種廣告的數量。當一個人對項目的一個水龍頭第二種佈局中打開包含地圖和信息對該項目： 
Android地圖崩潰，無效點例外
我得到的名單和信息將在這裏讀一JSON我通過PHP腳本動態生成（無問題）。我也從json獲取該項目的地址，並嘗試從該地址對地點進行地理編碼。我生成沒有錯誤的第一個佈局，但是當我嘗試進入第二個佈局時，應用程序崩潰，看起來像是地圖的空點異常。該應用程序沒有地圖元素。 下面是一些代碼：
從主要活動：
@Override
protected void onPostExecute(final List<AdModels> s) {
super.onPostExecute(s);
dialog.dismiss();
if(s != null) {
AdAdapter adapter = new AdAdapter(getApplicationContext(), R.layout.row, s);
lvAds.setAdapter(adapter);
lvAds.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
AdModels admodel = s.get(position);
Intent intent = new Intent(MainActivity.this, MapsActivity.class);
intent.putExtra("adInfo", new Gson().toJson(admodel));
startActivity(intent);
}
});
} else {
Toast.makeText(getApplicationContext(), "Not able to fetch data from server, please check url.", Toast.LENGTH_SHORT);
}
}
這裏是MapsActivity
package dk.forsoegsperson.fp;
import android.location.Address;
import android.location.Geocoder;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.text.Html;
import android.view.MenuItem;
import android.webkit.WebView;
import android.widget.TextView;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.gson.Gson;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
import dk.forsoegsperson.fp.Models.AdModels;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private TextView overskrift;
private TextView navn;
private TextView tlf;
private TextView email;
private TextView intro;
private WebView annonce;
String forsoeg_address;
String forsoeg_over;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
// setting up text views and stuff
setUpUIViews();
Bundle bundle = getIntent().getExtras();
if(bundle != null){
String json = bundle.getString("adInfo");
AdModels admodel = new Gson().fromJson(json, AdModels.class);
forsoeg_address = admodel.getAddress();
forsoeg_over = admodel.getOverskrift();
String coded_ad = admodel.getAnnonce();
String decoded_ad = Html.fromHtml(coded_ad).toString();
overskrift.setText(admodel.getOverskrift());
intro.setText(admodel.getIntro());
navn.setText(admodel.getNavn());
email.setText(admodel.getEmail());
tlf.setText("Tlf: " + admodel.getTlf());
annonce.loadData(decoded_ad, "text/html; charset=UTF-8", null);
}
}
private void setUpUIViews() {
overskrift = (TextView)findViewById(R.id.dOverskrift);
navn = (TextView)findViewById(R.id.dNavn);
tlf = (TextView)findViewById(R.id.dTlf);
email = (TextView)findViewById(R.id.dEmail);
intro = (TextView)findViewById(R.id.dIntro);
annonce = (WebView)findViewById(R.id.dAnnonce);
}
@Override
public void onMapReady(GoogleMap googleMap) {
GoogleMap mMap = googleMap;
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
if (forsoeg_address != null && forsoeg_address != "") {
try {
List<Address> addressList = geocoder.getFromLocationName(forsoeg_address, 1);
if (addressList != null && addressList.size() > 0) {
Address addres_loc = addressList.get(0);
LatLng pt = new LatLng(addres_loc.getLatitude(), addres_loc.getLongitude());
mMap.addMarker(new MarkerOptions().position(pt).title(forsoeg_over));
mMap.moveCamera(CameraUpdateFactory.newLatLng(pt));;
}
} catch (IOException e) {
e.printStackTrace();
}
}
else {
LatLng pt = new LatLng(56.2639, 9.5018);
mMap.addMarker(new MarkerOptions().position(pt).title(forsoeg_over));
mMap.moveCamera(CameraUpdateFactory.newLatLng(pt));
}
}
@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();
if (id == android.R.id.home) {
finish();
}
return super.onOptionsItemSelected(item);
}
}
這裏是activity_detail在xml;
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="@+id/map"
xmlns:tools="http://schemas.android.com/tools"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="150dp"
tools:context="dk.forsoegsperson.fp.MapsActivity"/>
<TextView
android:textSize="18dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/dOverskrift"
android:layout_alignParentTop="true"
android:layout_marginTop="160dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:divider="@null"
android:dividerHeight="0dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/dIntro"
android:layout_below="@+id/dOverskrift"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:divider="@null"
android:dividerHeight="0dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/dNavn"
android:layout_below="@+id/dIntro"
android:layout_centerHorizontal="true"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:divider="@null"
android:dividerHeight="0dp"/>
<TextView
android:autoLink="email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/dEmail"
android:layout_below="@+id/dNavn"
android:layout_centerHorizontal="true"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:divider="@null"
android:dividerHeight="0dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/dTlf"
android:layout_below="@+id/dEmail"
android:layout_centerHorizontal="true"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:divider="@null"
android:dividerHeight="0dp"/>
<WebView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/dAnnonce"
android:layout_below="@+id/dTlf"
android:layout_centerHorizontal="true"
android:divider="@null"
android:dividerHeight="0dp"/>
</RelativeLayout>
</ScrollView>
這裏是清單：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="dk.forsoegsperson.fp">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".detail" />
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_detail"></activity>
</application>
</manifest>
錯誤日誌：
07-22 09:09:29.478 2789-2971/dk.forsoegsperson.fp E/Surface: getSlotFromBufferLocked: unknown buffer: 0xa073c340
07-22 09:09:36.693 2789-2789/dk.forsoegsperson.fp E/SysUtils: ApplicationContext is null in ApplicationStatus
07-22 09:09:36.892 2789-2789/dk.forsoegsperson.fp E/libEGL: validate_display:255 error 3008 (EGL_BAD_DISPLAY)
07-22 09:09:36.892 2789-2789/dk.forsoegsperson.fp E/libEGL: validate_display:255 error 3008 (EGL_BAD_DISPLAY)
07-22 09:09:37.071 2789-2789/dk.forsoegsperson.fp E/DataReductionProxySettingListener: No DRP key due to exception:java.lang.ClassNotFoundException: com.android.webview.chromium.Drp
07-22 09:09:37.352 2789-2789/dk.forsoegsperson.fp E/AndroidRuntime: FATAL EXCEPTION: main
Process: dk.forsoegsperson.fp, PID: 2789
java.lang.RuntimeException: Unable to start activity ComponentInfo{dk.forsoegsperson.fp/dk.forsoegsperson.fp.MapsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
at dk.forsoegsperson.fp.MapsActivity.onCreate(MapsActivity.java:51)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
我一直在尋找這個數天。爲什麼應用程序崩潰？請注意，我只在模擬器上運行此功能，併爲此包提供正確的Google API密鑰。
（編輯：添加錯誤日誌）
爲什麼downvote？ – user1378824
您能發佈完整的錯誤消息（日誌）嗎？ – Danieboy
發佈您的LogCat錯誤 – Aspicas