适配器一个微调使得nullPointerExeption [英] Adapter for a spinner makes nullPointerExeption

问题描述

我在价值的文件夹中的一种制成一个数组列表，现在，当我想从源文件检索以使其适应微调它说nullPointerExeption：

  =微调（微调）findViewById（R.id.spinner）;    ArrayAdapter适配器= ArrayAdapter.createFromResource（这一点，R.array.worker，android.R.layout.simple_list_item_1）;
    spinner.setAdapter（适配器）;
    spinner.setOnItemSelectedListener（本）;
 

在LogCat中消息：

 产生的原因：android.content.res.Resources $ NotFoundException：在COM在android.content.res.Resources.getStringArray（Resources.java:527）String数组资源ID＃0x7f090001 .example.hay.myapplication.UserCreatingActivity.onCreate（UserCreatingActivity的.java：46）在android.app.Activity.performCreate（Activity.java:5990）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1106）的机器人.app.ActivityThread.performLaunchActivity（ActivityThread.java:227
 

解决方案

试着翻动 createFromRessource 最后两个参数：

替换为：

  ArrayAdapter适配器= ArrayAdapter.createFromResource（这一点，R.array.worker，android.R.layout.simple_list_item_1）;
 

方式：

  ArrayAdapter＆LT;串GT;适配器= ArrayAdapter.createFromResource（这一点，android.R.layout.simple_list_item_1，R.array.worker）;
 

在您的code：

  =微调（微调）findViewById（R.id.spinner）;    ArrayAdapter＆LT;串GT;适配器= ArrayAdapter.createFromResource（这一点，android.R.layout.simple_list_item_1，R.array.worker）;
    spinner.setAdapter（适配器）;
    spinner.setOnItemSelectedListener（本）;
 

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 nullPointerExeption:

 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);

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

解决方案

Try to flip the two last parameters in createFromRessource:

Replace:

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

By:

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

In your code:

    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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