如何在 Android 中设置有限的适配器列表
How to set limited adapter list in Android
在我的应用程序中，我使用 ArrayAdapter，我只想显示 6 项。
我在 adapter 中写了下面的代码：
@Override
public int getCount() {
return 6;
}
但是当转到页面并且如果项目大小为 0 时显示此错误：
FATAL EXCEPTION: main
Process: com.app.test, PID: 7264
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.get(ArrayList.java:411)
at com.app.test.Adapters.AuctionDetailBidListAdapter.getView(AuctionDetailBidListAdapter.java:46)
at android.widget.AbsListView.obtainView(AbsListView.java:3170)
at android.widget.ListView.makeAndAddView(ListView.java:2140)
at android.widget.ListView.fillDown(ListView.java:762)
at android.widget.ListView.fillFromTop(ListView.java:826)
at android.widget.ListView.layoutChildren(ListView.java:1893)
at android.widget.AbsListView.onLayout(AbsListView.java:2942)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1766)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1766)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:934)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
01-02 15:37:05.687 7264-7264/com.app.test E/AndroidRuntime: at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2684)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2400)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1537)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7183)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:959)
at android.view.Choreographer.doCallbacks(Choreographer.java:734)
at android.view.Choreographer.doFrame(Choreographer.java:670)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:945)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
我该如何解决？
适配器代码：
public class AuctionDetailBidListAdapter extends BaseAdapter {
private TextView edtUserName, time, price;
private ImageView User, line1;
public AuctionDetailBidListAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull ArrayList<Bid> objects) {
super(context, resource, objects);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View v = View.inflate(context, layout, null);
Bid model = (Bid) datas.get(position);
edtUserName = v.findViewById(R.id.edtUserName);
line1 = v.findViewById(R.id.line1);
time = v.findViewById(R.id.time);
price = v.findViewById(R.id.price);
edtUserName.setText(model.getName());
time.setText(getDateCurrentTimeZone(model.getEnd()) + "");
DecimalFormat df = new DecimalFormat(",###.##");
price.setText(df.format(Integer.parseInt(model.getCurrentPrice())) + "تومان");
User = v.findViewById(R.id.User);
Glide.with(context)
.load(Constants.SERVER + model.getAvatar())
.placeholder(R.mipmap.ic_launcher)
.signature(new StringSignature(String.valueOf(System.currentTimeMillis())))
.into(User);
if (position == 0) {
line1.setBackgroundColor(ContextCompat.getColor(context, R.color.winner_1));
} else {
line1.setBackgroundColor(ContextCompat.getColor(context, R.color.winner_2));
}
commonAction(v);
return v;
}
@Override
public int getCount() {
return 6;
}
您的数组中有零个项目 java.lang.IndexOutOfBoundsException: Index: 0,Size: 0，
构建一个只有 6 个项目的数组。
如果你能写下更多关于你的代码的细节
更新：
首先，您应该将 datas 列表声明为成员变量：
private ArrayList<Bid> datas = null;
然后在构造函数中使用构造函数参数初始化您的 datas 数组，如下所示：
datas = objects;
然后在getCount方法中做如下：
public int getCount() {
return datas.size() <= 6 ? datas.size : 6;
}
即：如果数组列表的大小小于或等于 6，它将 return 大小，否则始终为 6。试试这个
当您的 ArrayList objects（或数据少于 6 个成员）或数据 IndexOutOfBound 中没有元素时，将发生异常
试试这个
@Override
public int getCount() {
if(objects.size() < 6){
return objects.size();
}
else{
return 6;
}
}
更新
声明：
private ArrayList<Bid> objects = null;
在构造函数中
this.objects = objects
在我的应用程序中，我使用 ArrayAdapter，我只想显示 6 项。
我在 adapter 中写了下面的代码：
@Override
public int getCount() {
return 6;
}
但是当转到页面并且如果项目大小为 0 时显示此错误：
FATAL EXCEPTION: main
Process: com.app.test, PID: 7264
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.get(ArrayList.java:411)
at com.app.test.Adapters.AuctionDetailBidListAdapter.getView(AuctionDetailBidListAdapter.java:46)
at android.widget.AbsListView.obtainView(AbsListView.java:3170)
at android.widget.ListView.makeAndAddView(ListView.java:2140)
at android.widget.ListView.fillDown(ListView.java:762)
at android.widget.ListView.fillFromTop(ListView.java:826)
at android.widget.ListView.layoutChildren(ListView.java:1893)
at android.widget.AbsListView.onLayout(AbsListView.java:2942)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1766)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1766)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:934)
at android.view.View.layout(View.java:18878)
at android.view.ViewGroup.layout(ViewGroup.java:5953)
01-02 15:37:05.687 7264-7264/com.app.test E/AndroidRuntime: at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2684)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2400)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1537)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7183)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:959)
at android.view.Choreographer.doCallbacks(Choreographer.java:734)
at android.view.Choreographer.doFrame(Choreographer.java:670)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:945)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
我该如何解决？
适配器代码：
public class AuctionDetailBidListAdapter extends BaseAdapter {
private TextView edtUserName, time, price;
private ImageView User, line1;
public AuctionDetailBidListAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull ArrayList<Bid> objects) {
super(context, resource, objects);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View v = View.inflate(context, layout, null);
Bid model = (Bid) datas.get(position);
edtUserName = v.findViewById(R.id.edtUserName);
line1 = v.findViewById(R.id.line1);
time = v.findViewById(R.id.time);
price = v.findViewById(R.id.price);
edtUserName.setText(model.getName());
time.setText(getDateCurrentTimeZone(model.getEnd()) + "");
DecimalFormat df = new DecimalFormat(",###.##");
price.setText(df.format(Integer.parseInt(model.getCurrentPrice())) + "تومان");
User = v.findViewById(R.id.User);
Glide.with(context)
.load(Constants.SERVER + model.getAvatar())
.placeholder(R.mipmap.ic_launcher)
.signature(new StringSignature(String.valueOf(System.currentTimeMillis())))
.into(User);
if (position == 0) {
line1.setBackgroundColor(ContextCompat.getColor(context, R.color.winner_1));
} else {
line1.setBackgroundColor(ContextCompat.getColor(context, R.color.winner_2));
}
commonAction(v);
return v;
}
@Override
public int getCount() {
return 6;
}
您的数组中有零个项目 java.lang.IndexOutOfBoundsException: Index: 0,Size: 0，
构建一个只有 6 个项目的数组。
如果你能写下更多关于你的代码的细节
更新：
首先，您应该将 datas 列表声明为成员变量：
private ArrayList<Bid> datas = null;
然后在构造函数中使用构造函数参数初始化您的 datas 数组，如下所示：
datas = objects;
然后在getCount方法中做如下：
public int getCount() {
return datas.size() <= 6 ? datas.size : 6;
}
即：如果数组列表的大小小于或等于 6，它将 return 大小，否则始终为 6。试试这个
当您的 ArrayList objects（或数据少于 6 个成员）或数据 IndexOutOfBound 中没有元素时，将发生异常
试试这个
@Override
public int getCount() {
if(objects.size() < 6){
return objects.size();
}
else{
return 6;
}
}
更新
声明：
private ArrayList<Bid> objects = null;
在构造函数中
this.objects = objects