如何填充微調框

Question

我想填充微調框，但出現錯誤。這裏是我的代碼...

private ArrayList<String> ctRatioList = new ArrayList<String>(); 
private ArrayList<String> rVoltsList = new ArrayList<String>(); 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.parameters); 

    ctRatioList.add("800:5"); 
    ctRatioList.add("1200:5"); 
    ctRatioList.add("1600:5"); 
    ctRatioList.add("2000:5"); 
    ctRatioList.add("2500:5"); 
    ctRatioList.add("3000:5"); 
    ctRatioList.add("3500:5"); 
    ctRatioList.add("4000:5"); 
    ctRatioList.add("4500:5");   
    Spinner ctRatioSpinner = (Spinner) findViewById(R.id.ctRatioSpinner); 
    ArrayAdapter<String> ctRatioAdapter = new ArrayAdapter<String>(this, R.layout.parameters, ctRatioList); 
    ctRatioSpinner.setAdapter(ctRatioAdapter); 


    for(double i = 0; i < 10 ; i+=0.1) { 
     rVoltsList.add(Double.toString(i)); 
    } 
    Spinner rVoltsSpinner = (Spinner) findViewById(R.id.recloseVoltsSpinner); 
    ArrayAdapter<String> rVoltsAdapter = new ArrayAdapter<String>(this, R.layout.parameters, rVoltsList); 
    rVoltsSpinner.setAdapter(rVoltsAdapter); 
} 

這是我的logcat ...

06-26 09:39:30.235: W/dalvikvm(7711): threadid=1: thread exiting with uncaught exception (group=0x40015560) 
06-26 09:39:30.259: E/AndroidRuntime(7711): FATAL EXCEPTION: main 
06-26 09:39:30.259: E/AndroidRuntime(7711): java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:347) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:192) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.View.measure(View.java:8313) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.TableRow.getColumnsWidths(TableRow.java:308) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.TableLayout.findLargestCells(TableLayout.java:500) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.TableLayout.measureVertical(TableLayout.java:465) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.TableLayout.onMeasure(TableLayout.java:431) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.View.measure(View.java:8313) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1074) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.ScrollView.onMeasure(ScrollView.java:296) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.View.measure(View.java:8313) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.View.measure(View.java:8313) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.View.measure(View.java:8313) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:531) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.View.measure(View.java:8313) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.View.measure(View.java:8313) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.ViewRoot.performTraversals(ViewRoot.java:839) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1859) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.os.Handler.dispatchMessage(Handler.java:99) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.os.Looper.loop(Looper.java:130) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at java.lang.reflect.Method.invoke(Method.java:507) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at dalvik.system.NativeStart.main(Native Method) 
06-26 09:39:30.259: E/AndroidRuntime(7711): Caused by: java.lang.ClassCastException: android.widget.LinearLayout 
06-26 09:39:30.259: E/AndroidRuntime(7711):  at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:340) 
06-26 09:39:30.259: E/AndroidRuntime(7711):  ... 36 more 

Answer 1

異常說「ArrayAdapter需要的資源ID是一個TextView」

在這撥打資源R.layout.parameters不是文本視圖，它是一個完整的佈局：

ArrayAdapter<String> ctRatioAdapter = new ArrayAdapter<String>(this, R.layout.parameters, ctRatioList); 

你應該使用類似android.R.layout.simple_spinner_item。請參閱Android文檔中的Spinner Tutorial。

Answer 2

在此佈局R.layout.parameters did't包含任何TextView檢查一次您的適配器充氣佈局。