error at notifyDataSetChanged

Question

我在notifydataset更改时收到错误，我添加了notifydata更改，即使我收到错误

public SelectUserAdapter(List<SelectUser> selectUsers, Context context) {
_data = selectUsers;
_c = context;
this.arraylist = new ArrayList<>();
this.arraylist.addAll(_data);
}
@Override
public int getCount() {
return _data.size();
}
@Override
public Object getItem(int i) {
return _data.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@SuppressLint("InflateParams")
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public View getView(int i, View convertView, ViewGroup viewGroup) {
View view = convertView;
if (view == null) {
LayoutInflater li = (LayoutInflater) _c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = li.inflate(com.jamol.contacts.R.layout.contact_info, null);
} else {
view = convertView;
}
ViewHolder v = new ViewHolder();
v.title = (TextView) view.findViewById(com.jamol.contacts.R.id.name);
v.check = (CheckBox) view.findViewById(com.jamol.contacts.R.id.check);
v.setPhone((TextView) view.findViewById(com.jamol.contacts.R.id.no));
v.imageView = (ImageView) view.findViewById(com.jamol.contacts.R.id.pic);
final SelectUser data = _data.get(i);
v.title.setText(data.getName());
v.check.setChecked(data.getCheckedBox());
v.getPhone().setText(data.getPhone());
try {
if (data.getThumb() != null) {
v.imageView.setImageBitmap(data.getThumb());
} else {
v.imageView.setImageResource(com.jamol.contacts.R.drawable.ic_user);
}
} catch (OutOfMemoryError e) {
v.imageView.setImageDrawable(this._c.getDrawable(com.jamol.contacts.R.drawable.ic_user));
e.printStackTrace();
}
view.setTag(data);
return view;
}

public void filter(String charText) {
if (charText != null) {
charText = charText.toLowerCase(Locale.getDefault());
_data.clear();
if (charText.length() == 0) {
_data.addAll(arraylist);
} else {
for (SelectUser wp : arraylist)
if (wp.getName().toLowerCase(Locale.getDefault())
.contains(charText)) {
_data.add(wp);
}
}
}
notifyDataSetChanged();
}
static class ViewHolder {
ImageView imageView;
TextView title;
CheckBox check;

private TextView phone;
public TextView getPhone() {
return phone;
}
public void setPhone(TextView phone) {
this.phone = phone;
}
}
}

错误为

致命异常：main进程：com.jamol.contacts，PID:20086java.lang.IollegalStateException：适配器的内容具有已更改，但ListView未收到通知。确保适配器的内容不是从后台线程修改的，但是仅来自UI线程。确保您的适配器调用notifyDataSetChanged()的内容发生更改时。[英寸ListView(2131492978，类android.widget.ListView)和Adapter(类com.jamol.contacts.SelectUserAdapter)]在android.widget.ListView.layoutChildren(ListView.java：1584)在android.widget.AbsListView.onLayout(AbsListView.java:2645)在android.view.view.layout(view.java：16939)在android.view.ViewGroup.layout(ViewGroup.java：5409)在android.widget.RelativeLayout.onLayout(RelativeLayout.java：1077)在android.view.view.layout(view.java：16939)在android.view.ViewGroup.layout(ViewGroup.java：5409)在android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)在android.widget.FrameLayout.onLayout(FrameLayout.java:514)在android.view.view.layout(view.java：16939)在android.view.ViewGroup.layout(ViewGroup.java：5409)在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1702)在android.widget.LinearLayout.layoutVertical(LinearLayout.java:1556)在android.widget.LinearLayout.onLayout(LinearLayout.java:1465)在android.view.view.layout(view.java：16939)在android.view.ViewGroup.layout(ViewGroup.java：5409)在android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)在android.widget.FrameLayout.onLayout(FrameLayout.java:514)在android.view.view.layout(view.java：16939)在android.view.ViewGroup.layout(ViewGroup.java：5409)在android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2464)在android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2167)在android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1301)在android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7016)在android.view.Cchoreographer$CallbackRecord.run(Choreographer.java:777)在android.view.Cchoreographer.doCallbacks(Choreographer.java:590)位于android.view.Cchoreographer.doFrame(Choreographer.java:560)在android.view.Cchoreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)在android.os.Handler.handleCallback(Handler.java:739)在android.os.Handler.dispatchMessage(Handler.java:95)在android.os.Looper.loop(Looper.java:145)在android.app.ActivityThread.main(ActivityThreads.java:6946)位于java.lang.reflect.Method.ioke(本机方法)位于java.lang.reflect.Method.ioke(Method.java:372)在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java：1404)网址：com.android.internal.os.ZygoteInit.main(ZygoteNit.java:1199)02-0416:52:56.033 20086-20086/com.jamol.contacts I/Process:发送信号。PID：20086 SIG:9

MainActivity是

private class LoadContact extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Nullable
@Override
protected Void doInBackground(Void... voids) {
if (phones != null) {
Log.e("count", "" + phones.getCount());
if (phones.getCount() == 0) {
Log.d("No Contacts", "No Contacts");
}
while (phones.moveToNext()) {
AtomicReference<Bitmap> bit_thumb = new AtomicReference<>(null);
String name = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
String image_thumb = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.PHOTO_URI));
try {
if (image_thumb != null) {
bit_thumb.set(MediaStore.Images.Media.getBitmap(resolver, Uri.parse(image_thumb)));
} else {
Log.d("dont show any images", "dont show any images");
//bit_thumb = MediaStore.Images.Media.getBitmap(resolver, Uri.parse(image_thumb));
}
} catch (IOException e) {
e.printStackTrace();
}
SelectUser selectUser = new SelectUser();
selectUser.setThumb(bit_thumb.get());
selectUser.setName(name);
selectUser.setPhone(phoneNumber);
selectUser.setCheckedBox();
if (selectUsers == null) throw new AssertionError();
selectUsers.add(selectUser);

}
} else {
Log.e("Cursor close 1", "----------------");
}
//phones.close();
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
adapter = new SelectUserAdapter(selectUsers, MainActivity.this);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
synchronized (MainActivity.this) {
if (firstClickTime == 0) {
firstClickTime = SystemClock.elapsedRealtime();
nonDoubleClick = true;
} else {
long deltaTime = SystemClock.elapsedRealtime() - firstClickTime;
firstClickTime = 0;
if (deltaTime < DOUBLE_CLICK_TIMEOUT) {
nonDoubleClick = false;
this.onItemDoubleClick(adapterView, view, position, l);
return;
}
}
view.postDelayed(new Runnable() {
@Override
public void run() {
if (nonDoubleClick) {
Log.d("Single click", "single click");
}
}
}, DOUBLE_CLICK_TIMEOUT);
}
}
public void onItemDoubleClick(AdapterView<?> parent, View view, int position, long id) {
String selected = ((TextView) view.findViewById(com.jamol.contacts.R.id.no)).getText().toString();
try {
mediaPlayer = MediaPlayer.create(MainActivity.this, R.raw.call);
mediaPlayer.setVolume(1.0f, 1.0f);
mediaPlayer.setLooping(false);
mediaPlayer.start();
Vibrator v = (Vibrator) MainActivity.this.getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(500);
Intent in = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + selected));
startActivity(in);
} catch (SecurityException e) {
Log.e("PERMISSION_EXCEPTION", "PERMISSION_NOT_GRANTED");
}
}
}
);
listView.setFastScrollEnabled(true);
}
}

Answer 1

尝试在onPostExecute()方法中的listView.setAdapter(adapter);之后添加notifyDataSetChanged()

Answer 2

您正在从调用notifyDataSetChanged()的后台线程调用filter(String str)。确保在主UI线程上调用了notifyDataSetChanged()。

Answer 3

您正在SelectUserAdapter内部调用"notifyDataSetChanged()；"，请删除它。您可以在List selectUsers被更改/修改后使用"notifyDataSetChanged()"。像这样调用"notifyDataSetChanged()；">

adapter.notifyDataSetChanged();

注意：在将adapter设置为listView(listView.setAdapter(adapter)；)之后，应该调用此"adapter.notifyDataSetChanged()；">