由SQLite数据库间接调用NullPointerException？

当我尝试调用MyCursorAdapter.bindView时，我的Android应用程序崩溃。这里是logcat的日志：由SQLite数据库间接调用NullPointerException？

08-10 15:22:57.269: ERROR/AndroidRuntime(463): FATAL EXCEPTION: main 
08-10 15:22:57.269: ERROR/AndroidRuntime(463): java.lang.NullPointerException 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at com.mohit.gtodo.TasksCursorAdapter.bindView(TasksCursorAdapter.java:28) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.CursorAdapter.getView(CursorAdapter.java:186) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.AbsListView.obtainView(AbsListView.java:1315) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1198) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.ListView.onMeasure(ListView.java:1109) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.View.measure(View.java:8171) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:381) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.View.measure(View.java:8171) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.View.measure(View.java:8171) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:526) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.View.measure(View.java:8171) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.View.measure(View.java:8171) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.os.Handler.dispatchMessage(Handler.java:99) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.os.Looper.loop(Looper.java:123) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at java.lang.reflect.Method.invoke(Method.java:521) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
08-10 15:22:57.269: ERROR/AndroidRuntime(463):  at dalvik.system.NativeStart.main(Native Method)

这里是bindView方法在我的CursorAdapter：

TextView title = (TextView) view.findViewById(R.id.title); 
    EditText body = (EditText) view.findViewById(R.id.body); 
    TextView created = (TextView) view.findViewById(R.id.created); 

    title.setText(cursor.getString(cursor.getColumnIndex(TasksDBAdapter.KEY_TITLE))); 
    title.setSelected(cursor.getInt(cursor.getColumnIndex(TasksDBAdapter.KEY_COMPLETED)) > 0); 
    body.setText(cursor.getString(cursor.getColumnIndex(TasksDBAdapter.KEY_BODY))); 
    created.setText(((Long)cursor.getLong(cursor.getColumnIndex(TasksDBAdapter.KEY_CREATED))).toString());

线28开始与body.setText(cursor.getString(cursor.getColumnIndex(TasksDBAdapter.Key_BODY))); 需要任何其他信息？

UPDATE：

EditText body = (EditText) view.findViewById(R.id.body);

好像是空？这里是小部件：

<EditText android:id="@+id/body" android:layout_below="@+id/body_txt" android:text="" android:layout_width="fill_parent" android:layout_height="wrap_content" android:minLines="10"></EditText>

来源

2010-08-10 Mohit Deshpande

你有很多方法可以相互转换。您是否尝试过调试以查看哪个部分为空？ – Sephy 2010-08-10 15:52:58

检查更新。 – 2010-08-10 18:23:18

“视图”在哪里/如何实例化？ – Aurora 2010-08-10 20:44:25

您必须从另一个视图中获取您的引用，该视图参数在bindView方法中。视图只是行布局而不是整个布局。这就是为什么当你做view.findViewById时，它会返回null，因为Android在这个视图中不知道这个ID。

来源

2010-08-12 03:25:38 fedj

由SQLite数据库间接调用NullPointerException？

回答

相关问题