我试图在视图寻呼机中显示图像，并将该寻呼机视为列表视图中的行。当我运行应用程序时，我的模拟器崩溃并收到错误。请在此处查看我的日志猫。
java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 1, found: 4 Pager id: com.example.tazeen.classnkk:id/pagerMyPics Pager class: class android.support.v4.view.ViewPager Problematic adapter: class com.example.AdapterClasses.ViewPagerAdapter
at android.support.v4.view.ViewPager.populate(ViewPager.java:999)
at android.support.v4.view.ViewPager.populate(ViewPager.java:951)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1473)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1083)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:615)
at android.view.View.measure(View.java:17547)
at android.widget.GridLayout.measureChildWithMargins2(GridLayout.java:1004)
at android.widget.GridLayout.measureChildrenWithMargins(GridLayout.java:1014)
at android.widget.GridLayout.onMeasure(GridLayout.java:1055)
at android.view.View.measure(View.java:17547)
at android.widget.ListView.setupChild(ListView.java:1944)
at android.widget.ListView.makeAndAddView(ListView.java:1857)
at android.widget.ListView.fillSpecific(ListView.java:1344)
at android.widget.ListView.layoutChildren(ListView.java:1684)
at android.widget.AbsListView.onLayout(AbsListView.java:2151)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:562)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15671)
at android.view.ViewGroup.layout(ViewGroup.java:5038)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2114)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1843)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
我不明白我的代码出错了。我在此imageArray中获取所有行图像并将此imageArray传递给holder.view_pager。
if (!(vp_adapter == null))
{
vp_adapter.notifyDataSetChanged();
holder.view_pager.invalidate();
vp_adapter = new ViewPagerAdapter(context, imageArray);
holder.view_pager.setAdapter(vp_adapter);
holder.view_pager.setCurrentItem(1);
}
else
{
vp_adapter = new ViewPagerAdapter(context, imageArray);
holder.view_pager.setAdapter(vp_adapter);
holder.view_pager.setCurrentItem(1);
}
这是ViewPager适配器类
public class ViewPagerAdapter extends PagerAdapter {
// Declare Variables
Context context;
String png_Pattern = ".png";
String jpg_pattern = ".jpg";
String bmp_pattern = ".bmp";
String gif_pattern = ".gif";
String jpeg_pattern = ".jpeg";
String mp3_Pattern = ".mp3";
ArrayList<String> imgArray = new ArrayList<String>();
LayoutInflater inflater;
public ViewPagerAdapter(Context context, ArrayList<String> imgArray) {
this.context = context;
this.imgArray = imgArray;
}
@Override
public int getCount() {
return imgArray.size();
}
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position)
{
ImageView imageView;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.horizontalitem , container,false);
imageView = (ImageView) itemView.findViewById(R.id.image_AllPost);
String strImage = imgArray.get(position);
if (strImage.endsWith(mp3_Pattern))
{
imageView.setImageResource(R.drawable.audio_placeholder);
}
if (strImage.endsWith(png_Pattern) || strImage.endsWith(jpg_pattern) || strImage.endsWith(bmp_pattern) || strImage.endsWith(gif_pattern) || strImage.endsWith(jpeg_pattern))
{
imageView.setImageResource(R.drawable.img_placeholder);
}
((ViewPager) container).addView(itemView);
return itemView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// Remove viewpager_item.xml from ViewPager
((ViewPager) container).removeView((RelativeLayout) object);
}
}
有人可以帮我解决如何使用notifyDataSetChange解决此问题。
这是我的ListAdapter代码
class MyListAdapter extends ArrayAdapter<All_Post> {
Context context;
int layoutResourceId;
ArrayList<All_Post> data = new ArrayList<All_Post>();
private DisplayImageOptions options;
public MyListAdapter(Context context, int layoutResourceId, ArrayList<All_Post> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
dbhelper = new MyDbHelper(context);
dbhelper.onOpen(db);
}
@Override
public int getCount() {
return data.size();
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View row, ViewGroup parent) {
final Holder holder;
if (row == null) {
LayoutInflater vi;
vi = LayoutInflater.from(getContext());
row = vi.inflate(R.layout.allpostlist, parent, false);
holder = new Holder();
holder.text_ActivityId = (TextView) row.findViewById(R.id.textActivityId);
holder.text_InspectorName = (TextView) row.findViewById(R.id.textInspectorName);
holder.text_SpChar = (TextView) row.findViewById(R.id.textSpChar);
holder.text_Notation = (TextView) row.findViewById(R.id.textNotation);
holder.txtViewDate = (TextView) row.findViewById(R.id.txt_Date);
holder.txtInitialLetter = (TextView) row.findViewById(R.id.txt_InitialLetter);
holder.txtRemark = (TextView) row.findViewById(R.id.textRemark);
holder.txtFollowUpCount = (TextView) row.findViewById(R.id.count_txtFollowUp);
holder.txtCameraCount = (TextView) row.findViewById(R.id.count_txtImages);
holder.txtAudioCount = (TextView) row.findViewById(R.id.count_txtAudio);
holder.imgBtn_FollowUp = (ImageView) row.findViewById(R.id.imgButton_FoloowUp);
holder.imgBtn_RateEquipMent = (ImageView) row.findViewById(R.id.imgButtonRateEquipment);
holder.imgBtn_Camera = (ImageView) row.findViewById(R.id.imgButton_Camera);
holder.imgBtn_Audio = (ImageView) row.findViewById(R.id.imgButton_RecordAudio);
// holder.gallery = (Gallery)row.findViewById(R.id.gallery1);
holder.view_pager = (ViewPager)row.findViewById(R.id.pagerMyPics);
//holder.horizontalScrollView = (HorizontalScrollView) row.findViewById(R.id.hlist);
//holder.lLinearLayout = (LinearLayout) row.findViewById(R.id.innerlay);
row.setTag(holder);
} else {
holder = (Holder) row.getTag();
}
final All_Post all_Post = data.get(position);
holder.text_ActivityId.setText(all_Post.getStrActivityId());
holder.text_InspectorName.setText(all_Post.getStringInspectorname());
strListItem_ActivityId = all_Post.getStrActivityId();
/*******************************************************Start******************************************************************/
db = dbhelper.getReadableDatabase();
Cursor cursor = db.rawQuery("select * from ActivityObjectList where activityId ='" + strListItem_ActivityId + "'", null);
imageArray.clear();
audioCount.clear();
imageCount.clear();
try {
if (cursor.moveToFirst()) {
count = cursor.getCount();
do {
String imagePath = cursor.getString(cursor.getColumnIndex("imageaudioPath"));
if (imagePath.endsWith(mp3_Pattern))
{
String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String path = baseDir + "/classnkk_audio/" + imagePath;
File file = new File(path);
long length = file.length();
length = length / 1024;
if (length > 0)
{
Log.e("", "");
imageArray.add(imagePath);
audioCount.add(imagePath);
}}
if (imagePath.endsWith(png_Pattern) || imagePath.endsWith(jpg_pattern) || imagePath.endsWith(bmp_pattern) || imagePath.endsWith(gif_pattern) || imagePath.endsWith(jpeg_pattern))
{
String strBaseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String filepath = strBaseDir + "/classnkk_images/" + imagePath;
File file = new File(filepath);
long length = file.length();
length = length / 1024;
if (length > 0)
{ imageArray.add(imagePath);
imageCount.add(imagePath);}
}
}
while (cursor.moveToNext());
}
} finally {
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
if (!(vp_adapter == null))
{
vp_adapter.notifyDataSetChanged();
holder.view_pager.invalidate();
vp_adapter = new ViewPagerAdapter(context, imageArray);
holder.view_pager.setAdapter(vp_adapter);
holder.view_pager.setCurrentItem(1);
}
else
{
vp_adapter = new ViewPagerAdapter(context, imageArray);
holder.view_pager.setAdapter(vp_adapter);
holder.view_pager.setCurrentItem(1);
}
return row;
}
}
答案 0 :(得分：0)
异常只是意味着getCount（）发生了变化而你没有发送NotifyDataSetChanged。适配器会经常检查它，如果您读取数据库并且每次修改集合时都不通知适配器，那么您就不会收到此异常。
为了解决问题，在读取db之前实例化新列表。把它读到你的清单。 1.将新列表设置为适配器（使用通知适配器调用）或2.创建新适配器。