android：从字符串填充微调器.xml

android java

2022-09-03 16:36:05

我在用星期几填充微调器时遇到问题。

布局 xml：

<Spinner 
    android:id="@+id/week_spinner"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:drawSelectorOnTop="true"/>

字符串.xml

<resources>
  <string-array name="days_of_week">
    <item>Monday</item>
    <item>Tuesday</item>
    <item>Wednesday</item>
    <item>Thursday</item>
    <item>Friday</item>
  </string-array>
</resources>

爪哇岛：

public class AddModule extends Activity {
    Spinner day;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        day = (Spinner)findViewById(R.id.week_spinner);

        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.days_of_week, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        day.setAdapter(adapter);
        setContentView(R.layout.activity_add_module);
    }
}

这是导致应用程序崩溃的setAdapter线。我收到以下错误

11-05 21:24:31.235: W/dalvikvm(867): threadid=1: thread exiting with uncaught exception (group=0x40a9a228) 
11-05 21:24:31.245: E/AndroidRuntime(867): FATAL EXCEPTION: main 
11-05 21:24:31.245: E/AndroidRuntime(867): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cathal.timetable/com.cathal.timetable.AddModule}: java.lang.NullPointerException 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2202) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2237) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.app.ActivityThread.access$600(ActivityThread.java:139) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.os.Handler.dispatchMessage(Handler.java:99) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.os.Looper.loop(Looper.java:154) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.app.ActivityThread.main(ActivityThread.java:4974) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at java.lang.reflect.Method.invoke(Method.java:511) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at dalvik.system.NativeStart.main(Native Method) 11-05 21:24:31.245: E/AndroidRuntime(867): Caused by: java.lang.NullPointerException 11-05 21:24:31.245: E/AndroidRuntime(867):    at com.cathal.timetable.AddModule.onCreate(AddModule.java:18) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.app.Activity.performCreate(Activity.java:4538) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071) 
11-05 21:24:31.245: E/AndroidRuntime(867):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2158) 
11-05 21:24:31.245: E/AndroidRuntime(867):  ... 11 more

昨天工作正常。我不知道我是否可能改变了什么，或者我是否有日食问题。

答案 1

Nambari解释了为什么您会收到NullPointerException以及如何正确使用。findViewById()

我想指出一种更简单的方法来设置使用默认设置的微调器，只需将其添加到您的XML中即可：

android:entries="@array/days_of_week"

您可以在中删除对适配器的所有引用。onCreate()

答案 2

super.onCreate(savedInstanceState);
setContentView(yourView);
day = (Spinner)findViewById(R.id.week_spinner);

在从 xml 获取微调器之前，您忘记设置视图。如果未设置视图，则返回。findViewByIdnull

对引用的任何操作都会导致 .nullNullPointerException