這是我從ArrayList中獲取數據的代碼:爲什麼我沒有從ArrayList獲取ListView數據?
getTables=new Runnable()
{
@Override
public void run()
{
db.open();
try
{
tables = db.showAllTable();
for(int i=0;i<db.showAllTable().size();i++)
{
System.out.println("=====>"+(i+1));
System.out.println("Table :"+tables.get(i).toString());
}
customAdapter=new ImageAdapter(ListofTests.this, R.layout.list_row,tables);
}
catch (Exception e)
{
e.printStackTrace();
}
//setListAdapter(customAdapter);
runOnUiThread(hideProgressBar);
db.close();
}
};
這裏是我ImageAdapter類:
class ImageAdapter extends ArrayAdapter<Object>
{
private ArrayList<Object> tables;
//ImageLoader imageLoader;
Context m_context;
public ImageAdapter(Context context, int textViewResourceId,ArrayList<Object> items)
{
super(context, textViewResourceId, items);
m_context=context;
//this.tables = tables;
}
public View getView(final int position, View convertView, ViewGroup parent)
{
View v = convertView;
ViewHolder holder = null;
if (v == null)
{
try
{
holder=new ViewHolder();
//imageLoader=new ImageLoader(CustomSearch.this);
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.list_row, null);
holder.table_name=(TextView) v.findViewById(R.id.table_name);
v.setTag(holder);
}
catch(Exception e)
{
System.out.println("Excption Caught"+e);
}
}
else
holder=(ViewHolder)v.getTag();
Object table = tables.get(position);
if(table!=null)
{
holder.table_name.setText("Hello");
}
return v;
}
}
現在我不知道我錯了。我無法看到列表視圖中的數據列表。 請幫我解決這個問題。 謝謝。
錯誤日誌:
09-02 14:14:13.654: ERROR/AndroidRuntime(771): FATAL EXCEPTION: main
09-02 14:14:13.654:ERROR/AndroidRuntime(771):顯示java.lang.NullPointerException 09-02 14:14:13.654:ERROR/AndroidRuntime(771 ):at com.quiz.spellingquiz.ListofTests $ ImageAdapter.getView(ListofTests.java:143) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.widget.AbsListView.obtainView(AbsListView.java :1315) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.widget.ListView.measureHeightOfChildren(ListView.java:1198) 09-02 14:14:13.654:ERROR/AndroidRuntime(771) ):在android.widget.ListView.onMeasure(Lis tView.java:1109) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.view.View.measure(View.java:8171) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):在android.widget.RelativeLayout.measureChild(RelativeLayout.java:563) 09-02 14:14:13.654:錯誤/ AndroidRuntime(771):在android.widget.RelativeLayout.onMeasure(RelativeLayout.java: 378) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.view.View.measure(View.java:8171) 09-02 14:14:13.654:ERROR/AndroidRuntime(771) :at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 09 -02 14:14:13.654:ERROR/AndroidRuntime(771):at android.widget.LinearLayout.measureVerti cal(LinearLayout.java:381) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 09-02 14:14:13.654: ERROR/AndroidRuntime(771):at android.view.View.measure(View.java:8171) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.view.ViewGroup.measureChildWithMargins(ViewGroup。 java:3132) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 09-02 14:14:13.654:ERROR/AndroidRuntime( 771):at android.view.View.measure(View.java:8171) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.widget.LinearLayout.measureVertical(LinearLayout.java:526) 09:02:14:13.654:錯誤/ AndroidRuntime(771):在android.widget.LinearLayout.onMeasure(LinearLayout.ja va:304) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.view.View.measure(View.java:8171) 09-02 14:14:13.654:ERROR/AndroidRuntime( 771):at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.view.View.measure(View.java:8171) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 09-02 14:14:13.654:錯誤/ AndroidRuntime(771):在android.os.Handler.dispatchMessage(Handler.java:99) 0 9-02 14:14:13.654:錯誤/ AndroidRuntime(771):在android.os.Looper.loop(Looper.java:123) 09-02 14:14:13。654:ERROR/AndroidRuntime(771):在android.app.ActivityThread.main(ActivityThread.java:4627) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):在java.lang.reflect.Method中。 invokeNative(本機方法) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):在java.lang.reflect.Method.invoke(Method.java:521) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):在com.android.internal .os.ZygoteInit.main(ZygoteInit.java:626) 09-02 14:14:13.654:ERROR/AndroidRuntime(771):在dalvik.system.NativeStart.main(本機方法)
你得到任何錯誤? –
是的,我更新了有問題的錯誤日誌。請看看它。 –