我有一个扩展基础适配器的适配器，但我不知道为什么它总是返回空指针异常，我不知道为什么... 这是我的代码：
public class MembersAdapter extends BaseAdapter {
private static LayoutInflater inflater = null;
private Activity activity;
private ArrayList<UserInfoVO> data;
public MembersAdapter(Activity a, ArrayList<UserInfoVO> data) {
activity = a;
this.data = data;
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return data.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView,
final ViewGroup parent) {
View vi = convertView;
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.members_list_item, null);
holder = new ViewHolder();
holder.userImage = (CXRemoteImageView) convertView.findViewById(R.id.members_item_pic);
holder.title = (TextView) convertView.findViewById(R.id.members_item_title);
holder.small_text = (TextView) convertView.findViewById(R.id.members_item_small_text);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Log.v("mtag","The url ="+data.get(position).getPictureUrl());
holder.userImage.loadImmediate(data.get(position).getPictureUrl());
holder.title.setText(data.get(position).getName());
holder.small_text.setText(data.get(position).getAboutMe());
return vi;
}
static class ViewHolder {
public CXRemoteImageView userImage;
public TextView title;
public TextView small_text;
}
}
正如我在日志中看到的，所有数据都传递给适配器，但为什么我会遇到这个问题。
这也是我的logCat输出：
致命的例外：主要
java.lang.NullPointerException
at com.example.adapters.MembersAdapter.getView(MembersAdapter.java:69)
at android.widget.AbsListView.obtainView(AbsListView.java:2040)
at android.widget.ListView.makeAndAddView(ListView.java:1772)
at android.widget.ListView.fillDown(ListView.java:672)
at android.widget.ListView.fillFromTop(ListView.java:732)
at android.widget.ListView.layoutChildren(ListView.java:1625)
at android.widget.AbsListView.onLayout(AbsListView.java:1870)
at android.view.View.layout(View.java:11418)
at android.view.ViewGroup.layout(ViewGroup.java:4328)
at android.widget.FrameLayout.onLayout(FrameLayout.java:443)
at android.view.View.layout(View.java:11418)
at android.view.ViewGroup.layout(ViewGroup.java:4328)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1594)
at android.view.View.layout(View.java:11418)
at android.view.ViewGroup.layout(ViewGroup.java:4328)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:930)
at android.view.View.layout(View.java:11418)
at android.view.ViewGroup.layout(ViewGroup.java:4328)
at android.widget.FrameLayout.onLayout(FrameLayout.java:443)
at android.view.View.layout(View.java:11418)
at android.view.ViewGroup.layout(ViewGroup.java:4328)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1652)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1510)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1415)
at android.view.View.layout(View.java:11418)
at android.view.ViewGroup.layout(ViewGroup.java:4328)
at android.widget.FrameLayout.onLayout(FrameLayout.java:443)
at android.view.View.layout(View.java:11418)
at android.view.ViewGroup.layout(ViewGroup.java:4328)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1489)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4441)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
第69行就是这一行holder.userImage.loadImmediate(data.get(position).getPictureUrl());
注意：我看到它在设置图像源时返回nullPointerException，或者在textView上返回文本。
这是我的xml布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.clipix.clipix.views.CXRemoteImageView
android:id="@+id/community_clips_item_pic"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginRight="10dp"
android:src="@drawable/default_user_image" />
<TextView
android:id="@+id/community_clips_item_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/community_clips_item_pic"
android:layout_marginBottom="5dp"
android:layout_toEndOf="@+id/community_clips_item_pic"
android:layout_toRightOf="@+id/community_clips_item_pic"
android:text="New Text" />
<TextView
android:id="@+id/community_clips_item_small_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toEndOf="@+id/community_clips_item_pic"
android:text="Small Text"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textSize="12sp"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/community_clips_item_pic" />
</RelativeLayout>
答案 0 :(得分：1)
您的布局和代码中的视图ID不同。例如community_clips_item_pic与members_item_pic。因此findViewById()返回null，并使用空值初始化视图持有者。
此外，适配器getView()必须始终返回非空View。考虑返回convertView，而不是vi，可以将其初始化为null。
答案 1 :(得分：0)
您的观看者的xml不包含您正在使用的ID：
members_item_pic, members_item_small_text, members_item_title.
您正在使用
community_clips_item_small_text,community_clips_item_title,community_clips_item_pic
代替..
更改您的ID，您将解决问题