java-EAndroidRuntime：致命异常：main

概述在测试我的应用时,我在AndroidStudio-Consol中收到以下错误：08-2113:56:28.0599637-9637et.dominik.genpushE/AndroidRuntime﹕FATALEXCEPTION:mainProcess:net.dominik.genpush,PID:9637java.lang.RuntimeException:UnabletoinstantiateactivityComponentInf

在测试我的应用时,我在Android Studio-Consol中收到以下错误：

08-21 13:56:28.059    9637-9637/net.dominik.genpush E/AndroIDRuntime﹕ FATAL EXCEPTION: mainProcess: net.dominik.genpush, PID: 9637java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{net.dominik.genpush/net.dominik.genpush.settings}: java.lang.NullPointerException        at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2110)        at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)        at androID.app.ActivityThread.access0(ActivityThread.java:135)        at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)        at androID.os.Handler.dispatchMessage(Handler.java:102)        at androID.os.Looper.loop(Looper.java:136)        at androID.app.ActivityThread.main(ActivityThread.java:5001)        at java.lang.reflect.Method.invokeNative(Native Method)        at java.lang.reflect.Method.invoke(Method.java:515)        at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)        at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:601)        at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException        at androID.app.Activity.findVIEwByID(Activity.java:1884)        at net.dominik.genpush.settings.<init>(settings.java:23)        at java.lang.class.newInstanceImpl(Native Method)        at java.lang.class.newInstance(Class.java:1208)        at androID.app.Instrumentation.newActivity(Instrumentation.java:1061)        at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2101)            at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)            at androID.app.ActivityThread.access0(ActivityThread.java:135)            at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)            at androID.os.Handler.dispatchMessage(Handler.java:102)            at androID.os.Looper.loop(Looper.java:136)            at androID.app.ActivityThread.main(ActivityThread.java:5001)            at java.lang.reflect.Method.invokeNative(Native Method)            at java.lang.reflect.Method.invoke(Method.java:515)            at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)            at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:601)            at dalvik.system.NativeStart.main(Native Method)

这是一段代码：

public CheckBox checkBox_push;    public TextVIEw textVIEw_appby;    public button button_Feedback;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_settings);        checkBox_push = (CheckBox) findVIEwByID(R.ID.checkBox_push);        textVIEw_appby = (TextVIEw) findVIEwByID(R.ID.textVIEw_appby);        button_Feedback = (button) findVIEwByID(R.ID.button_Feedback);    }    public voID onTextClickAppBy(VIEw x)    {        Intent intent = new Intent();        intent.setAction(Intent.ACTION_VIEW);        intent.addcategory(Intent.category_broWSABLE);        intent.setData(Uri.parse("http://www.dominiktv.net"));        startActivity(intent);    }    //button Status Speichern    @OverrIDe    public voID onPause() {        super.onPause();        save(checkBox_push.isChecked());    }    @OverrIDe    public voID onResume() {        super.onResume();        checkBox_push.setChecked(load());    }    private voID save(final boolean isChecked) {        SharedPreferences sharedPreferences = getPreferences(Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sharedPreferences.edit();        editor.putBoolean("check", isChecked);        editor.commit();    }    private boolean load() {        SharedPreferences sharedPreferences = getPreferences(Context.MODE_PRIVATE);        return sharedPreferences.getBoolean("check", true);    }    public voID onCheckBoxPush(VIEw b)    {        if (checkBox_push.isChecked())        {            //PB            Pushbots.getInstance().setNotifyStatus(true);            //PB E            Toast.makeText(getApplicationContext(), "Push-Benachrichtigungen aktivIErt",                    Toast.LENGTH_SHORT).show();        }        else        {            //PB            Pushbots.getInstance().setNotifyStatus(false);            //PB E            Toast.makeText(getApplicationContext(), "Push-Benachrichtigungen deaktivIErt",                    Toast.LENGTH_SHORT).show();        }    }

该应用程序也可以处理该错误,但是在一个应用程序中出现错误并不是很好.
我已经用Google搜索了很多,但是我的Java技能还远远不够,这是我第一个自行创建的应用

解决方法:

Caused by: java.lang.NullPointerException    at androID.app.Activity.findVIEwByID(Activity.java:1884)    at net.dominik.genpush.settings.<init>(settings.java:23)

初始化活动设置对象(可能是成员变量)时,您太早调用findVIEwByID()了.您发布的代码没有显示该代码.

您实际上只能在onCreate()或更高版本中调用活动函数.

还要将findVIEwByID()放在setContentVIEw()之后,以便它实际上可以返回非null的值.

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