动态更改微调器字符串数组资源

我在使用微调器和字符串数组时遇到问题。我要根据条件（在我而言模式）微调项改变动态更改微调器字符串数组资源

下面

是我做的代码：

public class MainActivity extends Activity { 

    . 
    . 
    . 

    ArrayAdapter<CharSequence> aaParam1; 
    ArrayAdapter<CharSequence> aaParam2; 
    ArrayAdapter<CharSequence> aaParam3; 
    . 
    . 
    . 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    . 
      . 
      . 

    ReSpin(1); 
      . 
      . 
      . 
    } 

    public void ReSpin(int mode){ 
      int stepval = Integer.parseInt(setting.getString("steps", "1")); 

      switch(mode){ 
      case 1: 
       aaParam1 = ArrayAdapter.createFromResource(this, R.array.mode1param1, android.R.layout.simple_spinner_dropdown_item); 
       aaParam2 = ArrayAdapter.createFromResource(this, R.array.mode1param2, android.R.layout.simple_spinner_dropdown_item); 
       aaParam3 = ArrayAdapter.createFromResource(this, R.array.mode1param3, android.R.layout.simple_spinner_dropdown_item); 
       break; 
      case 2: 
       aaParam1 = ArrayAdapter.createFromResource(this, R.array.mode2param1, android.R.layout.simple_spinner_dropdown_item); 
       aaParam2 = ArrayAdapter.createFromResource(this, R.array.mode2param2, android.R.layout.simple_spinner_dropdown_item); 
       aaParam3 = ArrayAdapter.createFromResource(this, R.array.mode2param3, android.R.layout.simple_spinner_dropdown_item); 
       break; 
      case 3: 
       aaParam1 = ArrayAdapter.createFromResource(this, R.array.mode3param1, android.R.layout.simple_spinner_dropdown_item); 
       aaParam2 = ArrayAdapter.createFromResource(this, R.array.mode3param2, android.R.layout.simple_spinner_dropdown_item); 
       aaParam3 = ArrayAdapter.createFromResource(this, R.array.mode3param3, android.R.layout.simple_spinner_dropdown_item); 
       break; 
      } 

      aaParam1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
      aaParam2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
      aaParam3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

      spinParam1.setAdapter(aaParam1); 
      spinParam2.setAdapter(aaParam2); 
      spinParam3.setAdapter(aaParam3); 

    } 

}

上面的代码总是崩溃/退出时再旋转（）函数是OnCreate中调用（）

01-05 17:02:04.151: W/dalvikvm(22040): threadid=1: thread exiting with uncaught exception (group=0x41cc0930) 
01-05 17:02:04.183: E/AndroidRuntime(22040): FATAL EXCEPTION: main 
01-05 17:02:04.183: E/AndroidRuntime(22040): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.micom.testspin/com.micom.testspin.MainActivity}: java.lang.NullPointerException 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.app.ActivityThread.access$600(ActivityThread.java:141) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.os.Looper.loop(Looper.java:137) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.app.ActivityThread.main(ActivityThread.java:5039) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at java.lang.reflect.Method.invokeNative(Native Method) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at java.lang.reflect.Method.invoke(Method.java:511) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at dalvik.system.NativeStart.main(Native Method) 
01-05 17:02:04.183: E/AndroidRuntime(22040): Caused by: java.lang.NullPointerException 
01-05 17:02:04.183: E/AndroidRuntime(22040): at com.micom.testspin.MainActivity.ReSpin(MainActivity.java:273) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at com.micom.testspin.MainActivity.onCreate(MainActivity.java:67) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.app.Activity.performCreate(Activity.java:5104) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 
01-05 17:02:04.183: E/AndroidRuntime(22040): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 
01-05 17:02:04.183: E/AndroidRuntime(22040): ... 11 more 
01-05 17:02:04.206: W/ActivityManager(390): Force finishing activity com.micom.testspin/.MainActivity

来源

2013-01-05 FerryHtw

如果你想得到帮助，你需要发布堆栈跟踪，你从Logcat获得的异常。没有人不能帮助只是*上面的代码总是崩溃/退出时，ReSpin（）函数是从OnCreate（）*调用。 – Luksprog

谢谢，我忘了包括这些。 – FerryHtw

检查'settings'或任何'Spiners'为空。 – Luksprog

基于堆栈跟踪，你有MainActivity.java 273线空指针异常。看那里，看看哪些变量可能没有被初始化。

来源

2013-01-06 03:53:43 mkasberg

动态更改微调器字符串数组资源

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