Question

我一直在尝试扩展FragmentActivity。如果我将MainActivity类扩展为Activity并导入正常Activity的必要包，则相同的应用程序可用。

基本需求是我无法在正常活动中访问地图。它需要扩展FragmentActivity以运行以下行。

googleMap= ((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map)).getMap();

这是Java代码

package com.dacoders.locationtodo;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;

public class MainActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

这是布局XML

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

这是AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.dacoders.locationtodo"
    android:versionCode="1"
    android:versionName="1.0" >
    <permission
        android:name="com.dacoders.locationtodo.permission.MAPS_RECEIVE"
        android:protectionLevel="signature"/>
<uses-permission android:name="com.dacoders.locationtodo.permission.MAPS_RECEIVE"/>

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="17" />
        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
        <!-- The following two permissions are not required to use
             Google Maps Android API v2, but are recommended. -->
        <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

        <uses-feature
                android:glEsVersion="0x00020000"
                android:required="true"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.dacoders.locationtodo.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>
        <meta-data
    android:name="com.google.android.maps.v2.API_KEY"
    android:value="API_KEY_HERE"/>
    </application>

</manifest>

这是LOG

0622 21:01:25.911: D/dalvikvm(13621): Lateenabling CheckJNI
 0622 21:01:25.991: D/AndroidRuntime(13621): Shutting down VM
 0622 21:01:25.991: W/dalvikvm(13621): threadid=1: thread exiting with uncaught exception (group=0x41629930)
 0622 21:01:26.001: E/AndroidRuntime(13621): FATAL EXCEPTION: main
 0622 21:01:26.001: E/AndroidRuntime(13621): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dacoders.locationtodo/com.dacoders.locationtodo.MainActivity}: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.os.Handler.dispatchMessage(Handler.java:99)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.os.Looper.loop(Looper.java:137)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.ActivityThread.main(ActivityThread.java:5041)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at java.lang.reflect.Method.invokeNative(Native Method)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at java.lang.reflect.Method.invoke(Method.java:511)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at dalvik.system.NativeStart.main(Native Method)
 0622 21:01:26.001: E/AndroidRuntime(13621): Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.Activity.setContentView(Activity.java:1881)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at com.dacoders.locationtodo.MainActivity.onCreate(MainActivity.java:12)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.Activity.performCreate(Activity.java:5104)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
 0622 21:01:26.001: E/AndroidRuntime(13621):    ... 11 more
 0622 21:01:26.001: E/AndroidRuntime(13621): Caused by: java.lang.ClassCastException: com.google.android.gms.maps.MapFragment cannot be cast to android.support.v4.app.Fragment
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.support.v4.app.Fragment.instantiate(Fragment.java:369)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
 0622 21:01:26.001: E/AndroidRuntime(13621):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
 0622 21:01:26.001: E/AndroidRuntime(13621):    ... 20 more

Answer 1

你的min sdk是11.我猜你可以使它成为12并使用MapFragment。

要知道检查链接http://developer.android.com/about/dashboards/index.html的原因。

在这种情况下（minsdk为12或以上），你可以扩展Activity

  GoogleMap mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
                                .getMap();

还导入

  import com.google.android.gms.maps.MapFragment;

                   Or

您应该使用Support Fragment。

<fragment
class="com.google.android.gms.maps.SupportMapFragment"
android:id="@+id/map"  
android:layout_width="match_parent"
android:layout_height="match_parent"/>

您的活动必须延长FragmentActivity

SupportMapFragment fm = (SupportMapFragment)  getSupportFragmentManager().findFragmentById(R.id.map);
GoogleMap mMap = fm.getMap();

确保您已添加支持库

同时确保导入以下内容

import android.support.v4.app.FragmentActivity;  
import com.google.android.gms.maps.SupportMapFragment;

Answer 2

这是布局XML

<fragment

我不确定你是否可以将片段作为布局的根目录，因为片段应该是放在另一个布局中并交换的片段。

您是否尝试将片段放入FrameLayout并查看它是否仍然崩溃？

如果我扩展FragmentActivity，应用程序崩溃

2 个答案: