从另一个 Activity 使用 MapFragment 启动 Activity

Question

我开发了一个应用程序，我需要使用一个简单的按钮从我的菜单中启动一个新活动。我做了几个测试，发现如果我将包含 MapFragment 的 Activity 的 intent-filter 设置如下：

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

这工作正常，没有任何崩溃。 如果改为修改意图过滤器，以便在您打开应用程序时不立即启动 Activity，尤其是如下编辑：

 <action android:name="com.hpdev.maps.MYMAP" />

 <category android:name="android.intent.category.DEFAULT" />

Activity 未启动，应用崩溃。我该如何修复这个错误？ 我将代码包含在我的 activity.java 中：

public class MyMap extends Activity {

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

}}

我的堆栈跟踪：

04-03 20:49:57.637: E/AndroidRuntime(28889): FATAL EXCEPTION: main
04-03 20:49:57.637: E/AndroidRuntime(28889): Process: com.fziviello.altamuragroup, PID: 28889
04-03 20:49:57.637: E/AndroidRuntime(28889): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fziviello.altamuragroup/com.fziviello.altamuragroup.DoveSono}: android.view.InflateException: Binary XML file line #9: Error inflating class fragment
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2227)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2277)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.ActivityThread.access$800(ActivityThread.java:145)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1206)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.os.Handler.dispatchMessage(Handler.java:102)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.os.Looper.loop(Looper.java:136)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.ActivityThread.main(ActivityThread.java:5088)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at java.lang.reflect.Method.invokeNative(Native Method)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at java.lang.reflect.Method.invoke(Method.java:515)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:126)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at dalvik.system.NativeStart.main(Native Method)
04-03 20:49:57.637: E/AndroidRuntime(28889): Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class fragment
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at de.robv.android.xposed.XposedBridge.invokeOriginalMethodNative(Native Method)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at de.robv.android.xposed.XposedBridge.handleHookedMethod(XposedBridge.java:547)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.view.LayoutInflater.inflate(Native Method)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:344)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.Activity.setContentView(Activity.java:1952)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at com.fziviello.altamuragroup.DoveSono.onCreate(DoveSono.java:37)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.Activity.performCreate(Activity.java:5434)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2181)
04-03 20:49:57.637: E/AndroidRuntime(28889):    ... 12 more
04-03 20:49:57.637: E/AndroidRuntime(28889): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.google.android.gms.maps.MapFragment: make sure class name exists, is public, and has an empty constructor that is public
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.Fragment.instantiate(Fragment.java:597)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.Fragment.instantiate(Fragment.java:561)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.Activity.onCreateView(Activity.java:4816)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
04-03 20:49:57.637: E/AndroidRuntime(28889):    ... 25 more
04-03 20:49:57.637: E/AndroidRuntime(28889): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.maps.MapFragment" on path: DexPathList[[zip file "/data/app/com.fziviello.altamuragroup-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.fziviello.altamuragroup-1, /vendor/lib, /system/lib]]
04-03 20:49:57.637: E/AndroidRuntime(28889):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
04-03 20:49:57.637: E/AndroidRuntime(28889):    at android.app.Fragment.instantiate(Fragment.java:583)
04-03 20:49:57.637: E/AndroidRuntime(28889):    ... 28 more

Answer 1

如果您只需要从一个按钮开始一个新的Activity，只需在按钮的onClickListener 中创建一个明确指向Activity 的Intent。下面是在Fragment 的按钮中定义的 onClickListener：

mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(getActivity(), MapActivity.class);
            startActivity(intent);
        }
    });

您需要确保所有Activity 都在AndroidManifest.xml 中注册，但它们并不都需要意图过滤器。您将需要 Activity 中的 Main/Launcher 意图过滤器，您希望启动器图标打开，但其他 Activities 不需要意图过滤器，因为您可以像我在上面的代码中那样明确引用它们。