Question

我得到了一个＆gt;非常＆lt;简单的程序，当我尝试更改活动时崩溃。在我的fragment_app_launch.xml上只有一个Button（id：question_cat_button_1）：

AppLaunch.java

public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_app_launch,
                container, false);

        Button b = (Button)rootView.findViewById(R.id.question_cat_button_1);

        b.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                Intent intent = new Intent("com.pthuermer.juraQuiz.QuizActivity");
                startActivity(intent);

            }

        });

        return rootView;
    }

AndroidManifest：

<activity
        android:name="com.pthuermer.juraquiz.QuizActivity"
        android:label="@string/title_activity_quiz" >
</activity>

logcat的误差：

03-13 21:09:54.602: E/AndroidRuntime(13753): FATAL EXCEPTION: main
03-13 21:09:54.602: E/AndroidRuntime(13753): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.pthuermer.juraQuiz.QuizActivity }
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1671)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.app.Instrumentation.execStartActivity(Instrumentation.java:1441)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.app.Activity.startActivityForResult(Activity.java:3464)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.app.Activity.startActivityForResult(Activity.java:3425)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.support.v4.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java:848)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.support.v4.app.Fragment.startActivity(Fragment.java:878)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at com.pthuermer.juraquiz.AppLaunch$PlaceholderFragment$1.onClick(AppLaunch.java:75)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.view.View.performClick(View.java:4475)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.view.View$PerformClick.run(View.java:18786)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.os.Handler.handleCallback(Handler.java:730)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.os.Handler.dispatchMessage(Handler.java:92)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.os.Looper.loop(Looper.java:137)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at android.app.ActivityThread.main(ActivityThread.java:5419)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at java.lang.reflect.Method.invokeNative(Native Method)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at java.lang.reflect.Method.invoke(Method.java:525)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
03-13 21:09:54.602: E/AndroidRuntime(13753):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

更改

Intent intent = new Intent("com.pthuermer.juraQuiz.QuizActivity");

到

Intent intent = new Intent("com.pthuermer.juraquiz.QuizActivity");

小＆＃34; q＆＃34;

Differences in implicit and explicit Intents

您可以通过搜索Google轻松找到很多关于隐式Intents的内容，但通常是在您自己的应用内启动Activity，您可以使用明确的Intent更容易获得它起作用。

Answer 2

Java区分大小写，因此com.pthuermer.juraquiz.QuizActivity和com.pthuermer.juraQuiz.QuizActivity不一样，这就是您获得ActivityNotFoundException的原因。它应该是：

 Intent intent = new Intent("com.pthuermer.juraQuiz.QuizActivity");
 startActivity(intent);

Answer 3

您将意图的操作设置为"com.pthuermer.juraQuiz.QuizActivity"。我想你想使用http://developer.android.com/reference/android/content/Intent.html#setClassName(java.lang.String，java.lang.String）。

Answer 4

嘿，改变你对此的意图

Intent intent = new Intent(getApplicationContext(),com.pthuermer.juraquiz.QuizActivity.class);

使用Intent时应用程序崩溃

4 个答案: