微调器的适配器使NullPointerException [英] Adapter for a spinner makes NullPointerException

问题描述

我在值的一个文件夹中创建了一个数组列表，现在，当我想通过从源文件夹中检索它并显示为NullPointerException的方式使它适应微调器时:

I made an array list in one of my value's folder, now when i want to adapt it to the spinner by retrieving it from the source folder it says NullPointerException:

 spinner = (Spinner) findViewById(R.id.spinner);

    ArrayAdapter adapter = ArrayAdapter.createFromResource(this,R.array.worker,android.R.layout.simple_list_item_1);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);

LogCat中的消息:

Messages in LogCat:

 Caused by: android.content.res.Resources$NotFoundException: String array resource ID #0x7f090001 at android.content.res.Resources.getStringArray(Resources.java:527) at com.example.hay.myapplication.UserCreatingActivity.onCreate(UserCreatingActivity‌​.java:46) at android.app.Activity.performCreate(Activity.java:5990) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:227

推荐答案

尝试翻转createFromRessource中的最后两个参数:

Try to flip the two last parameters in createFromRessource:

替换:

ArrayAdapter adapter = ArrayAdapter.createFromResource(this,R.array.worker,android.R.layout.simple_list_item_1);

通过:

ArrayAdapter<String> adapter = ArrayAdapter.createFromResource(this, android.R.layout.simple_list_item_1, R.array.worker);

在您的代码中:

    spinner = (Spinner) findViewById(R.id.spinner);

    ArrayAdapter<String> adapter = ArrayAdapter.createFromResource(this, android.R.layout.simple_list_item_1, R.array.worker);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);

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