notifyDataSetChanged错误

Question

我在通知数据集更改了一个错误，我添加了通知数据集更改，甚至我得到了一个错误。

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;
        }
    }
}

错误是

致命异常:主进程: com.jamol.contacts，PID: 20086 java.lang.IllegalStateException:适配器的内容已经更改，但是ListView没有收到通知。确保适配器的内容不是从后台线程修改的，而是从UI线程修改的。确保适配器在其内容更改时调用notifyDataSetChanged()。在ListView(2131492978 )android.widget.ListView.layoutChildren(ListView.java:1584) at android.widget.AbsListView.onLayout(AbsListView.的适配器(类com.jamol.contacts.SelectUserAdapter)java:2645)在android.view.ViewGroup.layout(ViewGroup.java:5409)的android.view.View.layout(View.java:16939)在android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077) at android.view.View.layout(View.java:16939)在android.view.ViewGroup.layout(ViewGroup.java:5409) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579) at android.widget.FrameLayout。android.view.ViewGroup.layout(ViewGroup.java:5409) onLayout(FrameLayout.java:514) at android.view.View.layout(View.java:16939)在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1702) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1556)在android.widget.LinearLayout.onLayout(LinearLayout.java:1465) at android.view.View.layout(View.java:16939)的安卓。android.widget.FrameLayout.layoutChildren(FrameLayout.java:579) at android.widget.FrameLayout.onLayout(FrameLayout.java:514)的view.ViewGroup.layout(ViewGroup.java:5409)在android.view.ViewGroup.layout(ViewGroup.java:5409)的android.view.View.layout(View.java:16939)在android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2464) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2167)在android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1301) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7016) at android.view.Choreographer$CallbackRecord.run(Choreographer.java：777)在android.view.Choreographer.doCallbacks(Choreographer.java:590) at android.view.Choreographer.doFrame(Choreographer.java:560)在android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763) at android.os.Handler.handleCallback(Handler.java:739)在android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:145) at android.app.ActivityThread.main(ActivityThread.java:6946) at java.lang.reflect.Method.invoke(原生方法) at java.lang.reflect.Method.invoke在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)上，com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199) 02-04 16:52:56.033 20086-20086/com.jamol.Contact 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

您正在从后台线程调用filter(String str)，该线程正在调用notifyDataSetChanged()。确保主UI线程上调用了notifyDataSetChanged()。

Answer 2

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

Answer 3

您正在调用"notifyDataSetChanged();“在SelectUserAdapter中，删除它。在列表notifyDataSetChanged()更改/修改后，可以使用“selectUsers ()”。像这样调用“notifyDataSetChanged()”

 adapter.notifyDataSetChanged();

注意:在将适配器设置为listView (listView.setAdapter(适配器)；)之后，应该将其称为“listView.setAdapter()；”