Android 使用listview中的按钮出现奇怪的IndexOutException
我在使用包含按钮的listview的活动中遇到了一个非常奇怪的问题 这个错误似乎是随机出现的(虽然我们知道它并不存在),我的意思是说我不能得到一个定义的模式来重现这个错误。这种事经常发生 我试图弄清楚的一个大问题是logCat在我的代码中没有显示错误,只是在android用来确定点击来自何处的代码中(我相信)。请注意,错误中没有提到不属于android/java的包 日志:Android 使用listview中的按钮出现奇怪的IndexOutException,android,listview,Android,Listview,我在使用包含按钮的listview的活动中遇到了一个非常奇怪的问题 这个错误似乎是随机出现的(虽然我们知道它并不存在),我的意思是说我不能得到一个定义的模式来重现这个错误。这种事经常发生 我试图弄清楚的一个大问题是logCat在我的代码中没有显示错误,只是在android用来确定点击来自何处的代码中(我相信)。请注意,错误中没有提到不属于android/java的包 日志: 12-14 12:04:20.994: ERROR/AndroidRuntime(5619): FATAL EXCEPTI
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): FATAL EXCEPTION: main
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): java.lang.IndexOutOfBoundsException
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at java.util.Arrays$ArrayList.get(Arrays.java:77)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:298)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:351)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.Spinner.makeAndAddView(Spinner.java:189)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.Spinner.layout(Spinner.java:148)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.Spinner.onLayout(Spinner.java:112)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.View.layout(View.java:7032)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.View.layout(View.java:7032)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1238)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.onLayout(LinearLayout.java:1044)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.View.layout(View.java:7032)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.View.layout(View.java:7032)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.View.layout(View.java:7032)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.View.layout(View.java:7032)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.View.layout(View.java:7032)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.ViewRoot.performTraversals(ViewRoot.java:1055)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.view.ViewRoot.handleMessage(ViewRoot.java:1737)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.os.Handler.dispatchMessage(Handler.java:99)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.os.Looper.loop(Looper.java:123)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at java.lang.reflect.Method.invokeNative(Native Method)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at java.lang.reflect.Method.invoke(Method.java:521)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-14 12:04:20.994: ERROR/AndroidRuntime(5619): at dalvik.system.NativeStart.main(Native Method)
这是我的自定义ArrayAdapter代码,当我反复单击不同行中的各种“boton_modificar”时会发生错误,大多数情况下如果我快速单击它们
private class CustomAdapter extends ArrayAdapter<DataType> {
public CustomAdapter(Context context, int resource,List<DataType> objects) {
super(context, resource, objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
final int position2 = position;
if (row == null) {
LayoutInflater inflater = getLayoutInflater();
row = inflater.inflate(R.layout.row_layout,parent,false);
}
//Some more code here
ImageButton boton_modificar = (ImageButton) row.findViewById(R.id.modificar);
boton_modificar.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
DataT t = tr.get(position2);
((EditText) (findViewById(R.id.monto))).setText(Double.toString(t.m));
((Spinner) (findViewById(R.id.spinnerTipoB))).setSelection(t.posSTB);
((Spinner) (findViewById(R.id.spinnerB))).setSelection(t.posSB);
}
});
return (row);
}
}
新增代码:
spinnerTipoB.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3) {
int posId = tipoBIds[position];
if (posId == 0) {
spinnerB.setAdapter(arrayAdapterBP);
} else if (posId == 1) {
spinnerB.setAdapter(arrayAdapterBT);
} else if (posId == 2) {
spinnerB.setAdapter(arrayAdapterBO);
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// Do Nothing
}
});
我假设错误发生是因为
((微调器)(findviewbyd(R.id.spinnerB)).setSelection(t.posSB)在spinnerB.setAdapter(arrayAdapterNAME)
完成之前执行code>。此问题与ListView的
适配器无关,与Spinner
适配器有关
单击其中一个按钮时,可以在两个微调器上调用setSelection()
。如果您签入代码,您将看到它缓存了新选定项的整数索引,并调用requestLayout()
来重新绘制自身(稍后)
当UI线程处理布局消息时,它会在视图树中布局所有内容,但在布局微调器时会爆炸,因为它先前缓存的索引不再有效。适配器的列表已被更改。。。这一定是在响应UI事件(如Button onClick())时发生的,并且该事件在处理布局消息之前已得到处理
在O.p.中添加了评论讨论和代码之后添加。:
错误的假设是Spinner.setSelection()
会导致onItemSelectedListener
事件在返回之前运行。解决此特定问题的方法是从按钮onClick()设置微调器适配器,然后再设置选定的索引 任何地方都没有页眉和页脚tr
是一个数组列表,数据在那里,我没有得到NPE。我的代码甚至没有到达这些行,当它崩溃时,它会在进入clickListener之前到达这些行。通过将onClick
方法中的position2
记录到LogCat
来验证它是否为正确的整数值。看起来问题出在2setSelection
方法调用附近。我感觉position2
不是您想象的那样,因为它是在onClick
事件方法中被访问的,该方法在getView
方法中。我在自己的项目中解决了这个问题,如果您发现position2
不是您所期望的,请告诉我,这似乎很好,数字总是在范围内。是否“//Some more code”有处理列表的代码?顺便说一句,如果你的位置大于list.size(),你将不会得到NPE,你将得到“出界”。
spinnerTipoB.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3) {
int posId = tipoBIds[position];
if (posId == 0) {
spinnerB.setAdapter(arrayAdapterBP);
} else if (posId == 1) {
spinnerB.setAdapter(arrayAdapterBT);
} else if (posId == 2) {
spinnerB.setAdapter(arrayAdapterBO);
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// Do Nothing
}
});
arrayAdapterNAME = new ArrayAdapter<String>(this, R.layout.layoutspinner, DATA);