设置Spinner后，我得到以下错误： java.lang.RuntimeException：无法启动活动ComponentInfo
我发现，当我注释掉这一行时：
spinner1.setOnItemSelectedListener（new Spinner1Listener（））;
它在MainActivity Class（第195行）中运行得很好但是我显然无法为微调器处理OnItemClicked事件。这是我的MainActivity Class
package school.joran.trainitknowit;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.GestureDetector;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Spinner;
import android.widget.Toast;
import school.joran.trainitknowit.fragments.FragmentDefault;
import school.joran.trainitknowit.fragments.FragmentSettings;
import school.joran.trainitknowit.menu.main.mainAdapter;
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
String navMenuTitles[];
int navnMenuIcons[] = {R.drawable.ic_plus_grey, R.drawable.ic_library_grey, R.drawable.ic_import_export_grey, R.drawable.ic_settings_grey, R.drawable.ic_help_grey};
SharedPreferences prefs;
SharedPreferences.Editor prefsEditor;
final String KEYUserLoggedIn = "keyUserLoggedIn";
final String KEYUsername = "keyUsername";
final String KEYUserProfilePic = "keyUserProfilePic";
public Boolean userLoggedIn;
String username;
int userProfilPic;
RecyclerView mRecyclerView; // Declaring RecyclerView
RecyclerView.Adapter mAdapter; // Declaring Adapter For Recycler View
RecyclerView.LayoutManager mLayoutManager; // Declaring Layout Manager as a linear layout manager
DrawerLayout Drawer; // Declaring DrawerLayout
ActionBarDrawerToggle mDrawerToggle; // Declaring Action Bar Drawer Toggle
public FragmentManager fragManager;
public FragmentTransaction fragTrans;
private Spinner spinner1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnSpinner1();
navMenuTitles = getResources().getStringArray(R.array.menu_main_item_names);
toolbar = (Toolbar) findViewById(R.id.toolbar); // Attaching the layout to the toolbar object
toolbar.setTitle(R.string.app_title);
setSupportActionBar(toolbar); // Setting toolbar as the ActionBar with setSupportActionBar() call
fragManager = getFragmentManager(); //Setting Fragment Manager
fragTrans = fragManager.beginTransaction(); //Beginning Transaction so the Fragment can be created
fragTrans.add(R.id.MainLayout, new FragmentDefault());
fragTrans.commit();
prefs = this.getSharedPreferences("mainPreferences", MODE_PRIVATE);
prefsEditor = prefs.edit();
userLoggedIn = prefs.getBoolean(KEYUserLoggedIn, false);
username = prefs.getString(KEYUsername, getString(R.string.no_user));
userProfilPic = prefs.getInt(KEYUserProfilePic, R.drawable.ic_user_template_white);
prefs.edit().apply();
mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView); // Assigning the RecyclerView Object to the xml View
mRecyclerView.setHasFixedSize(true); // Letting the system know that the list objects are of fixed size
mAdapter = new mainAdapter(navMenuTitles, navnMenuIcons, username, userProfilPic); // Creating the Adapter of MyAdapter class(which we are going to see in a bit)
// And passing the titles,icons,header view name, header view email,
// and header view profile picture
mRecyclerView.setAdapter(mAdapter); // Setting the adapter to RecyclerView
mLayoutManager = new LinearLayoutManager(this); // Creating a layout Manager
mRecyclerView.setLayoutManager(mLayoutManager); // Setting the layout Manager
final GestureDetector mGestureDetector = new GestureDetector(MainActivity.this, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
Drawer = (DrawerLayout) findViewById(R.id.DrawerLayout); // Drawer object Assigned to the view
mDrawerToggle = new ActionBarDrawerToggle(this, Drawer, toolbar, R.string.openDrawer, R.string.closeDrawer) {
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
// code here will execute once the drawer is opened( As I dont want anything happened when drawer is
// open I am not going to put anything here)
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
// Code here will execute once drawer is closed
}
};
Drawer.setDrawerListener(mDrawerToggle); // Drawer Listener set to the Drawer toggle
mDrawerToggle.syncState(); // Finally we set the drawer toggle sync State
mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
@Override
public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
View child = recyclerView.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
if (child != null && mGestureDetector.onTouchEvent(motionEvent)) {
Drawer.closeDrawers();
fragManager = getFragmentManager();
switch (recyclerView.getChildAdapterPosition(child)) {
case 0: {
Toast.makeText(MainActivity.this, R.string.nicht_verfügbar, Toast.LENGTH_SHORT).show();
break;
}
case 1: {
toolbar.setTitle(R.string.app_title);
fragTrans = fragManager.beginTransaction(); //Beginning Transaction so the Fragment can be created
fragTrans.replace(R.id.MainLayout, new FragmentDefault());
fragTrans.commit();
break;
}
case 2: {
toolbar.setTitle(navMenuTitles[1]);
fragTrans = fragManager.beginTransaction(); //Beginning Transaction so the Fragment can be created
fragTrans.replace(R.id.MainLayout, new FragmentDefault());
fragTrans.commit();
break;
}
case 3: {
toolbar.setTitle(navMenuTitles[2]);
fragTrans = fragManager.beginTransaction(); //Beginning Transaction so the Fragment can be created
fragTrans.replace(R.id.MainLayout, new FragmentDefault());
fragTrans.commit();
break;
}
case 4: {
toolbar.setTitle(navMenuTitles[3]);
fragTrans = fragManager.beginTransaction(); //Beginning Transaction so the Fragment can be created
fragTrans.replace(R.id.MainLayout, new FragmentSettings());
fragTrans.commit();
break;
}
case 5: {
toolbar.setTitle(navMenuTitles[4]);
fragTrans = fragManager.beginTransaction(); //Beginning Transaction so the Fragment can be created
fragTrans.replace(R.id.MainLayout, new FragmentDefault());
fragTrans.commit();
break;
}
}
return true;
}
return false;
}
@Override
public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
}
public void addListenerOnSpinner1() {
spinner1 = (Spinner) findViewById(R.id.spinnerBenachrichtigungenZeitintervalle);
spinner1.setOnItemSelectedListener(new Spinner1Listener());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
/*int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}*/
return super.onOptionsItemSelected(item);
}
}
当我尝试运行我的应用时，这是我的完整错误日志：
10-10 00:51:54.727 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ Zygote::ForkAndSpecialize : 0
10-10 00:51:54.727 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ zygote get new systemTid : 9565
10-10 00:51:54.727 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ Late-enabling CheckJNI
10-10 00:51:54.729 9565-9567/school.joran.trainitknowit D/dalvikvm﹕ threadid=2: interp stack at 0x5a64a000
10-10 00:51:54.731 9565-9569/school.joran.trainitknowit D/dalvikvm﹕ threadid=3: interp stack at 0x5a752000
10-10 00:51:54.732 9565-9569/school.joran.trainitknowit D/dalvikvm﹕ Elevating priority from 0 to -8
10-10 00:51:54.732 9565-9565/school.joran.trainitknowit D/jdwp﹕ prepping for JDWP over ADB
10-10 00:51:54.732 9565-9565/school.joran.trainitknowit D/jdwp﹕ ADB transport startup
10-10 00:51:54.739 9565-9571/school.joran.trainitknowit D/dalvikvm﹕ threadid=4: interp stack at 0x5a85a000
10-10 00:51:54.740 9565-9571/school.joran.trainitknowit D/jdwp﹕ JDWP: thread running
10-10 00:51:54.740 9565-9571/school.joran.trainitknowit D/jdwp﹕ acceptConnection
10-10 00:51:54.740 9565-9571/school.joran.trainitknowit D/jdwp﹕ trying to receive file descriptor from ADB
10-10 00:51:54.740 9565-9573/school.joran.trainitknowit D/dalvikvm﹕ threadid=5: interp stack at 0x5d15b000
10-10 00:51:54.740 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ zygote get thread init done
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ create interp thread : stack size=32KB
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ create new thread
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ new thread created
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ update thread list
10-10 00:51:54.741 9565-9574/school.joran.trainitknowit D/dalvikvm﹕ threadid=6: interp stack at 0x5d163000
10-10 00:51:54.741 9565-9574/school.joran.trainitknowit D/dalvikvm﹕ threadid=6: created from interp
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ start new thread
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ create interp thread : stack size=32KB
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ create new thread
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ new thread created
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ update thread list
10-10 00:51:54.741 9565-9574/school.joran.trainitknowit D/dalvikvm﹕ threadid=6: notify debugger
10-10 00:51:54.741 9565-9574/school.joran.trainitknowit D/dalvikvm﹕ threadid=6 (ReferenceQueueDaemon): calling run()
10-10 00:51:54.741 9565-9575/school.joran.trainitknowit D/dalvikvm﹕ threadid=7: interp stack at 0x5d26b000
10-10 00:51:54.741 9565-9575/school.joran.trainitknowit D/dalvikvm﹕ threadid=7: created from interp
10-10 00:51:54.741 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ start new thread
10-10 00:51:54.742 9565-9575/school.joran.trainitknowit D/dalvikvm﹕ threadid=7: notify debugger
10-10 00:51:54.742 9565-9575/school.joran.trainitknowit D/dalvikvm﹕ threadid=7 (FinalizerDaemon): calling run()
10-10 00:51:54.742 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ create interp thread : stack size=32KB
10-10 00:51:54.742 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ create new thread
10-10 00:51:54.742 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ new thread created
10-10 00:51:54.742 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ update thread list
10-10 00:51:54.744 9565-9576/school.joran.trainitknowit D/dalvikvm﹕ threadid=8: interp stack at 0x5d373000
10-10 00:51:54.744 9565-9576/school.joran.trainitknowit D/dalvikvm﹕ threadid=8: created from interp
10-10 00:51:54.744 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ start new thread
10-10 00:51:54.746 9565-9576/school.joran.trainitknowit D/dalvikvm﹕ threadid=8: notify debugger
10-10 00:51:54.746 9565-9576/school.joran.trainitknowit D/dalvikvm﹕ threadid=8 (FinalizerWatchdogDaemon): calling run()
10-10 00:51:54.754 9565-9577/school.joran.trainitknowit D/dalvikvm﹕ threadid=9: interp stack at 0x5d779000
10-10 00:51:54.754 9565-9578/school.joran.trainitknowit D/dalvikvm﹕ threadid=10: interp stack at 0x5d881000
10-10 00:51:54.800 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ open_cached_dex_file : /data/app/school.joran.trainitknowit-2.apk /data/dalvik-cache/data@app@school.joran.trainitknowit-2.apk@classes.dex
10-10 00:51:54.813 9565-9565/school.joran.trainitknowit W/dalvikvm﹕ VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
10-10 00:51:54.814 9565-9565/school.joran.trainitknowit I/dalvikvm﹕ Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onSearchRequested
10-10 00:51:54.814 9565-9565/school.joran.trainitknowit W/dalvikvm﹕ VFY: unable to resolve interface method 17267: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
10-10 00:51:54.814 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ VFY: replacing opcode 0x72 at 0x0002
10-10 00:51:54.814 9565-9565/school.joran.trainitknowit I/dalvikvm﹕ Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onWindowStartingActionMode
10-10 00:51:54.814 9565-9565/school.joran.trainitknowit W/dalvikvm﹕ VFY: unable to resolve interface method 17271: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
10-10 00:51:54.814 9565-9565/school.joran.trainitknowit D/dalvikvm﹕ VFY: replacing opcode 0x72 at 0x0002
10-10 00:51:54.824 9565-9571/school.joran.trainitknowit D/jdwp﹕ received file descriptor 48 from ADB
10-10 00:51:54.827 9565-9571/school.joran.trainitknowit D/jdwp﹕ processIncoming
10-10 00:51:54.830 9565-9571/school.joran.trainitknowit D/jdwp﹕ processIncoming
10-10 00:51:54.830 9565-9571/school.joran.trainitknowit D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x13, id=0x4000B066, flags=0x0, dataLen=0x8
10-10 00:51:54.839 9565-9571/school.joran.trainitknowit D/jdwp﹕ processIncoming
10-10 00:51:54.839 9565-9571/school.joran.trainitknowit D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x17, id=0x4000B067, flags=0x0, dataLen=0xC
10-10 00:51:54.839 9565-9571/school.joran.trainitknowit D/jdwp﹕ processIncoming
10-10 00:51:54.839 9565-9571/school.joran.trainitknowit D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x13, id=0x4000B068, flags=0x0, dataLen=0x8
10-10 00:51:54.840 9565-9571/school.joran.trainitknowit D/jdwp﹕ processIncoming
10-10 00:51:54.840 9565-9571/school.joran.trainitknowit D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x13, id=0x4000B069, flags=0x0, dataLen=0x8
10-10 00:51:54.840 9565-9571/school.joran.trainitknowit D/jdwp﹕ processIncoming
10-10 00:51:54.842 9565-9571/school.joran.trainitknowit D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x14, id=0x4000B06A, flags=0x0, dataLen=0x9
10-10 00:51:54.868 9565-9571/? D/jdwp﹕ processIncoming
10-10 00:51:54.869 9565-9571/? D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x14, id=0x4000B06C, flags=0x0, dataLen=0x9
10-10 00:51:54.871 9565-9565/? I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
10-10 00:51:54.871 9565-9565/? W/dalvikvm﹕ VFY: unable to resolve virtual method 426: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
10-10 00:51:54.871 9565-9565/? D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
10-10 00:51:54.872 9565-9571/? D/jdwp﹕ processIncoming
10-10 00:51:54.872 9565-9571/? D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x14, id=0x4000B06E, flags=0x0, dataLen=0x9
10-10 00:51:54.873 9565-9565/? I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
10-10 00:51:54.873 9565-9565/? W/dalvikvm﹕ VFY: unable to resolve virtual method 448: Landroid/content/res/TypedArray;.getType (I)I
10-10 00:51:54.873 9565-9565/? D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
10-10 00:51:54.877 9565-9565/? D/skia﹕ Flag is not 10
10-10 00:51:54.899 9565-9565/? D/AndroidRuntime﹕ Shutting down VM
10-10 00:51:54.899 9565-9565/? W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x4109b9a8)
10-10 00:51:54.901 9565-9565/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{school.joran.trainitknowit/school.joran.trainitknowit.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2377)
at android.app.ActivityThread.access$600(ActivityThread.java:167)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5341)
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:929)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at school.joran.trainitknowit.MainActivity.addListenerOnSpinner1(MainActivity.java:195)
at school.joran.trainitknowit.MainActivity.onCreate(MainActivity.java:60)
at android.app.Activity.performCreate(Activity.java:5125)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2289)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2377)
at android.app.ActivityThread.access$600(ActivityThread.java:167)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5341)
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:929)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
at dalvik.system.NativeStart.main(Native Method)
10-10 00:51:55.406 9565-9571/? D/jdwp﹕ processIncoming
10-10 00:51:55.406 9565-9571/? D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x14, id=0x4000B06F, flags=0x0, dataLen=0x9
10-10 00:51:55.406 9565-9571/? D/jdwp﹕ sendBufferedRequest : len=0x34
10-10 00:51:55.903 9565-9571/? D/jdwp﹕ processIncoming
10-10 00:51:55.904 9565-9571/? D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x14, id=0x4000B070, flags=0x0, dataLen=0x9
10-10 00:51:55.904 9565-9571/? D/jdwp﹕ sendBufferedRequest : len=0x34
10-10 00:51:56.403 9565-9571/? D/jdwp﹕ processIncoming
10-10 00:51:56.403 9565-9571/? D/jdwp﹕ handlePacket : cmd=0x1, cmdSet=0xC7, len=0x14, id=0x4000B071, flags=0x0, dataLen=0x9
10-10 00:51:56.403 9565-9571/? D/jdwp﹕ sendBufferedRequest : len=0x34
10-10 00:51:56.550 9565-9565/? I/Process﹕ Sending signal. PID: 9565 SIG: 9
其他重要代码：
FragmentSetting.java
package school.joran.trainitknowit.fragments;
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import school.joran.trainitknowit.R;
public class FragmentSettings extends Fragment {
View myView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
myView = inflater.inflate(R.layout.fragment_settings, container, false);
return myView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
fragment_setting.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollViewSettings"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/textGlobaleEinstellungen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="3dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="20dp"
android:text="@string/GlobaleEinstellungen"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="bold" />
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="@color/divider" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:focusable="false"
android:orientation="horizontal">
<Switch
android:id="@+id/switchBenachrichtigen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:switchMinWidth="80dp"
android:text="@string/regelmBenachrichtigen"
android:textOff="@string/aus"
android:textOn="@string/ein"
android:thumb="@drawable/switch_thumb"
android:track="@drawable/switch_track" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/divider" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_margin="10dp"
android:orientation="horizontal">
<Spinner
android:id="@+id/spinnerBenachrichtigungenZeitintervalle"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:entries="@array/benachrichtigungenZeitintervalle" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/divider" />
</LinearLayout>
</ScrollView>
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="school.joran.trainitknowit" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="school.joran.trainitknowit.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>
</application>
</manifest>
请帮帮我！我在互联网上搜索了几个小时，但找不到解决方案。
答案 0 :(得分：0)
您的微调器是片段布局的一部分，但您在活动中调用了addListenerOnSpinner()。活动的布局没有这个微调器，所以当你执行
spinner1 = (Spinner) findViewById(R.id.spinnerBenachrichtigungenZeitintervalle);
spinner1为空，因此下一行会抛出NullPointerException。
如果微调器位于片段布局中，则需要将Spinner代码放入片段中，而不是活动中。