Question

我尝试使用Google Settings | Android Developers中的指南为我的应用设置设置。但每当我尝试打开设置时，它就说不幸已经停止了。

MainActivity.java

...
Intent startSettings;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
    setContentView(R.layout.main);
    startSettings = new Intent(this, SettingsActivity.class);
}
public void openSettings() {
    startActivity(startSettings);
}
...

SettingsActivity.java

...
public class SettingsActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Display the fragment as the main content.
        getFragmentManager().beginTransaction()
                .replace(android.R.id.content, new SettingsFragment())
                .commit();
    }
}

SettingsFragment.java

public class SettingsFragment extends PreferenceFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {

        // Load preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences);
    }
}

的preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <PreferenceCategory
        android:title="@string/main_settings_title"
        android:key="pref_key_main_settings">
        <SwitchPreference
            android:key="pref_key_enable_service"
            android:summary="@string/pref_summary_enable_service"
            android:title="@string/pref_title_enable_service"
            android:defaultValue="false" />
    </PreferenceCategory>
</PreferenceScreen>

Logcat错误

07-09 11:37:24.355  26218-26218/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ilolabs.ctdn/com.ilolabs.ctdn.SettingsActivity}: java.lang.RuntimeException: This should be called after super.onCreate.
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2072)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2097)
    at android.app.ActivityThread.access$600(ActivityThread.java:137)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1203)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4863)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
    at dalvik.system.NativeStart.main(Native Method)
    Caused by: java.lang.RuntimeException: This should be called after super.onCreate.
    at android.preference.PreferenceFragment.requirePreferenceManager(PreferenceFragment.java:318)
    at android.preference.PreferenceFragment.addPreferencesFromResource(PreferenceFragment.java:283)
    at com.ilolabs.ctdn.SettingsFragment.onCreate(SettingsFragment.java:14)
    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:796)
    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)
    at android.app.BackStackRecord.run(BackStackRecord.java:635)
    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)
    at android.app.Activity.performStart(Activity.java:5249)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2045)
                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2097)
                at android.app.ActivityThread.access$600(ActivityThread.java:137)
                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1203)
                at android.os.Handler.dispatchMessage(Handler.java:99)
                at android.os.Looper.loop(Looper.java:137)
                at android.app.ActivityThread.main(ActivityThread.java:4863)
                at java.lang.reflect.Method.invokeNative(Native Method)
                at java.lang.reflect.Method.invoke(Method.java:511)
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
                at dalvik.system.NativeStart.main(Native Method)

我试着阅读这个logcat并搜索我的代码中的错误，但我找不到对我有意义的代码崩溃的原因。我还没有太多经验，我是新手。请指出我哪里做错了？我完全按照上面链接的谷歌指南向我解释了。

Answer 1

您忘记在SettingsFragment的onCreate方法中致电arr = ['next_release()', 'last_release("com_disagg")'] class t(object): def head(self): print "inside head" return "head printed" def next_release(): print "nr" return t() def last_release(var): print var return t() for i in arr: eval(i) for i in arr: print eval(i+".head()") for i in arr: print eval(i).head()。看看最后一个＆＃34;引起的＆＃34;异常堆栈跟踪中的行。

Answer 2

请看这个 -

    @Override
        public void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
       // Load preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences);
        }

不幸的是，在使用片段构建设置时，app已停止

2 个答案: