Question

我正在尝试使用Android支持库将新的Google Maps Android API v2合并到一个应用程序中。我经历了很多迭代，试图去某个地方工作，现在我放弃了，并且认为我应该在这里问。

我访问了API控制台，创建了一个项目，为Android启用了Google Maps API v2，根据需要创建了调试KEY并将其粘贴到清单上。没有身份验证问题或类似的事情。很确定我这样做了。

在我的项目的libs文件夹中，我放了android-support-v4.jar（通过项目右键单击 - ＆gt; Android-＆gt;添加支持库...）。在Eclipse中，我将File-＆gt; Import-＆gt; Android-＆gt;现有Android代码导入工作区，并导入最新的（rev 3）android-sdk / google / google_play_services / libproject / google-play-services_lib。然后我将它作为依赖库添加到我的项目中（项目右键单击 - ＆gt;属性 - ＆gt; Android-＆gt;将其添加为底部的库依赖项。

在我的清单中我有：

<manifest xmlns:android="http://schemas.android.com/apk/res/android" ...>
    <permission
      android:name="myapp.permission.MAPS_RECEIVE"
      android:protectionLevel="signature"/>

    <All the uses-permission required like INTERNET, ACCESS_NETWORK_STATE, WRITE_EXTERNAL_STORAGE, FINE AND COARSE LOCATION, etc>
    <uses-permission android:name="myapp.permission.MAPS_RECEIVE"/>
    <uses-feature android:glEsVersion="0x00020000" android:required="true"/>
    <application ...>
        ...
        <uses-library android:name="com.google.android.maps" />
        <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="AI..."/>
    </application>

在我的mainview.xml中，我有：

<fragment
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/map"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   class="com.google.android.gms.maps.SupportMapFragment" />

现在在MainView.java上我有：

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;

public class MainView extends FragmentActivity ... {
    private GoogleMap mMap;

    @Override
    protected void onResume() {
        ...
        Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.map);
        SupportMapFragment mapFragment = (SupportMapFragment)fragment;
        mMap = mapFragment.getMap();
        //PROBLEM: mMap is null here even though mapFragment is not
    }
}

然后我想我可能需要初始化片段，所以我在设置内容视图后添加到onCreate中：

//Fragments
FragmentManager manager = getSupportFragmentManager(); 
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.map, SupportMapFragment.newInstance());
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
transaction.commit();

然后我说，也许它不是SupportMapFragment但我实际上应该引用实际的片段，并且在我的onResume中我做了：

Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.map);
SupportMapFragment mapFragment = (SupportMapFragment)fragment;

//Fragments
FragmentManager manager = getSupportFragmentManager(); 
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.map, mapFragment);
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
transaction.commit();

mMap = mapFragment.getMap();

在此之后

mMap再次为空。

然后我看到有一个MapsInitializer课，所以我想也许我应该先打电话。

所以我在上面代码中获取片段之前添加了代码：

try {
    MapsInitializer.initialize(this);
} catch (GooglePlayServicesNotAvailableException e) {
    e.printStackTrace();
}

使用此Logcat报告警告（第313行是MapsInitializer.initialize(this)）：

com.google.android.gms.common.GooglePlayServicesNotAvailableException
    at com.google.android.gms.internal.n.c(Unknown Source)
    at com.google.android.gms.internal.n.a(Unknown Source)
    at com.google.android.gms.maps.MapsInitializer.initialize(Unknown Source)
    at myapp.activities.MainView.inflateSelectedViewAndSetData(MainView.java:313)
    at myapp.activities.MainView.onClick(MainView.java:642)
    at android.view.View.performClick(View.java:3153)
    at android.view.View$PerformClick.run(View.java:12148)
    at android.os.Handler.handleCallback(Handler.java:587)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:152)
    at android.app.ActivityThread.main(ActivityThread.java:4615)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:491)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
    at dalvik.system.NativeStart.main(Native Method)

在整个尝试过程中，Logcat会报告以下警告：

Google Play services out of date.  Requires 2010100 but found 1013

这可能是罪魁祸首，但我没有找到解决办法。

此时我没有想法。我读了几个帖子here，here，here，但没有一条建议解决了这个问题。对于后者，他们建议不要包括项目依赖项，只包括jar文件。好吧，使用google-play-services.jar文件夹中的google-play-services_lib/libs或从该项目导出我自己的jar都无效。

顺便说一下，我在实际设备上运行（2.3.5和3.2的平板电脑），而不是模拟器。

任何帮助全心全意地赞赏。：）

更新

解决方案在下面是量子比特。

到目前为止导出库依赖项，一个不必处理它的简洁方法（处理存储库时很痛苦）是使用FatJar并导出google_play_services_lib项目（我DID NOT不创建本地副本，因为当它更新时我不想重新导入），并在项目中包含tha输出fat jar文件作为另一个jar文件。注意：当选择要包含在胖罐中的jar文件时，我必须排除annotations.jar文件，因为它已经预先包含并导致重复错误。现在，我所要做的就是将google_play_services_rev_3.jar包含在我项目的libs文件夹中，我很高兴。

Answer 1

如该链接底部所述; http://developer.android.com/google/play-services/setup.html

以及适当处理此示例的示例代码;

int checkGooglePlayServices =    GooglePlayServicesUtil.isGooglePlayServicesAvailable(mContext);
    if (checkGooglePlayServices != ConnectionResult.SUCCESS) {
    // google play services is missing!!!!
    /* Returns status code indicating whether there was an error. 
    Can be one of following in ConnectionResult: SUCCESS, SERVICE_MISSING, SERVICE_VERSION_UPDATE_REQUIRED, SERVICE_DISABLED, SERVICE_INVALID.
    */
       GooglePlayServicesUtil.getErrorDialog(checkGooglePlayServices, mActivity, 1122).show();
    }

Answer 2

我的项目遇到了同样的问题。解决方案非常简单，只需处理((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();可以返回null的可能性。如果您将处理null，则可以使用SupportMapFragment处理Google Play services out of date.错误，并向您显示地图本地化消息和用于更新Google Play服务的按钮，就像这样@qubz是在示例项目中讲述。

示例代码：

@Override
protected void onResume() {
    super.onResume();
    setUpMapIfNeeded();
}

/**
 * Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
 * installed) and the map has not already been instantiated.. This will ensure that we only ever
 * call {@link #setUpMap()} once when {@link #mMap} is not null.
 * <p>
 * If it isn't installed {@link SupportMapFragment} (and
 * {@link com.google.android.gms.maps.MapView MapView}) will show a prompt for the user to
 * install/update the Google Play services APK on their device.
 * <p>
 * A user can return to this FragmentActivity after following the prompt and correctly
 * installing/updating/enabling the Google Play services. Since the FragmentActivity may not have been
 * completely destroyed during this process (it is likely that it would only be stopped or
 * paused), {@link #onCreate(Bundle)} may not be called again so we should call this method in
 * {@link #onResume()} to guarantee that it will be called.
 */
private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();
        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            setUpMap();
        }
    }
}

/**
 * This is where we can add markers or lines, add listeners or move the camera. In this case, we
 * just add a marker near Africa.
 * <p>
 * This should only be called once and when we are sure that {@link #mMap} is not null.
 */
private void setUpMap() {
    mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}

结果：

enter image description here

记录悲伤

只有在加载基础地图系统并且片段中的基础视图存在时，才能使用getMap（）获取GoogleMap。该类自动初始化地图系统和视图;但是，当它准备就绪时，您无法保证，因为这取决于Google Play服务APK的可用性。如果GoogleMap不可用，则getMap（）将返回null。 SupportMapFragment

Answer 3

从Play商店下载并安装最新的Google Play services。出于某种原因，我无法通过搜索找到它。通过从文件夹/extras/google/google_play_services/samples/maps中的SDK运行示例应用程序，我被提示安装升级并被带到Play商店执行此操作。

谷歌地图Android API v2抛出GooglePlayServicesNotAvailableException，过时，SupportMapFragment.getMap（）返回null

3 个答案: