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這是一個android項目。我正在使用一個數組來構建一個微調器，它可以正常工作。不過，我現在正試圖將一條記錄添加到數組的開頭，以便在頁面加載時不選擇任何選項。Java - 添加單個字符串來啓動數組
我試圖只需使用一個myarray.add("---")類型的事情，但它與下面的錯誤倒下：
11-05 10:50:36.995: D/AndroidRuntime(16763): Shutting down VM
11-05 10:50:36.995: W/dalvikvm(16763): threadid=1: thread exiting with uncaught exception (group=0x412b42a0)
11-05 10:50:37.000: E/AndroidRuntime(16763): FATAL EXCEPTION: main
11-05 10:50:37.000: E/AndroidRuntime(16763): java.lang.NullPointerException
11-05 10:50:37.000: E/AndroidRuntime(16763): at com.directenquiries.assessment.tool.AddAsset.updateLocalDesc(AddAsset.java:461)
11-05 10:50:37.000: E/AndroidRuntime(16763): at com.directenquiries.assessment.tool.AddAsset$3.onItemSelected(AddAsset.java:262)
11-05 10:50:37.000: E/AndroidRuntime(16763): at android.widget.AdapterView.fireOnSelected(AdapterView.java:892)
11-05 10:50:37.000: E/AndroidRuntime(16763): at android.widget.AdapterView.access$200(AdapterView.java:49)
11-05 10:50:37.000: E/AndroidRuntime(16763): at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:860)
11-05 10:50:37.000: E/AndroidRuntime(16763): at android.os.Handler.handleCallback(Handler.java:615)
11-05 10:50:37.000: E/AndroidRuntime(16763): at android.os.Handler.dispatchMessage(Handler.java:92)
11-05 10:50:37.000: E/AndroidRuntime(16763): at android.os.Looper.loop(Looper.java:137)
11-05 10:50:37.000: E/AndroidRuntime(16763): at android.app.ActivityThread.main(ActivityThread.java:4898)
11-05 10:50:37.000: E/AndroidRuntime(16763): at java.lang.reflect.Method.invokeNative(Native Method)
11-05 10:50:37.000: E/AndroidRuntime(16763): at java.lang.reflect.Method.invoke(Method.java:511)
11-05 10:50:37.000: E/AndroidRuntime(16763): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
11-05 10:50:37.000: E/AndroidRuntime(16763): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
11-05 10:50:37.000: E/AndroidRuntime(16763): at dalvik.system.NativeStart.main(Native Method)
11-05 10:50:37.020: D/dalvikvm(16763): GC_CONCURRENT freed 243K, 7% free 12989K/13831K, paused 1ms+3ms, total 25ms
我的代碼是：
public void setupAssetType(Boolean beenSet){
Log.e("CamDebug", "Loading asset type");
Cursor c = db.rawQuery("select * from AssetTypes", null);
Log.e("Error Tracking", "Loading AssetTypes");
if(c.getCount() != 0) {
c.moveToFirst();
final ArrayList<String> mAssetType = new ArrayList<String>();
final ArrayList<String> mTypeID= new ArrayList<String>();
c.moveToFirst();
mAssetType.add("TEST");
mTypeID.add("TEST");
while(!c.isAfterLast()) {
mAssetType.add(c.getString(c.getColumnIndex("AssetType")));
mTypeID.add(c.getString(c.getColumnIndex("AssetTypeID")));
c.moveToNext();
}
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, mAssetType);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spnAssetType.setAdapter(spinnerArrayAdapter);
int count = 0;
if(beenSet == true) {
for (String mID : mTypeID) {
Log.e("Set asset type", mID);
if(mID.equals(orAssetTypeID)){
spnAssetType.setSelection(count);
Log.e("Set asset type FOUND", mID);
break;
}
count++;
}
}
c.close();
spnAssetType.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
Log.e("CamDebug", "Selected asset type");
if(mAssetType.size() > 0){
setupGroup(mTypeID.get(position), false);
AssetType = mTypeID.get(position);
updateLocalDesc();
Log.e("Error Tracking", "Before Asset Type set");
if(mTypeID.get(position) != null) {
AssetTypeID = mTypeID.get(position);
} else {
AssetTypeID = "";
}
Log.e("Error Tracking", "After As");
}
}
@Override
public void onNothingSelected(AdapterView<?> parentView) {
}
});
}
}
正如你可以看到我已經加入：
mAssetType.add("TEST");
mTypeID.add("TEST");
來測試。但它不起作用。任何想法將不勝感激。
編輯：行461：AssetGroup = spnAssetGroup.getSelectedItem().toString();
EDIT 2 - 請不用說爲什麼不downvote。這不是生產什麼那麼
編輯3這似乎是個錯誤即將在此區塊包括像461和用於創建文本紡紗文字一行：
public void updateLocalDesc(){
AssetType = spnAssetType.getSelectedItem().toString();
AssetGroup = spnAssetGroup.getSelectedItem().toString();
if(spnAssetSubGroup.getSelectedItem() != null && !spnAssetSubGroup.getSelectedItem().toString().equals("")){
AssetSubGroup = spnAssetSubGroup.getSelectedItem().toString();
tbLongDescription.setText(AssetType + "-" + AssetGroup + "-" + AssetSubGroup);
} else
{
tbLongDescription.setText(AssetType + "-" + AssetGroup);
}
}
你的代碼中哪一行是第461行？ –
其中是方法updateLocalDesc（）。什麼是Assets類中的第461行。 – jeet
刪除兩個ArrayList的最後，並使兩個級別變量 –