[Exposed Dropdown Menu] Filtering incorrectly applied after rotation

Description: It seems that in some cases filtering is incorrectly applied to AutocompleteTextView after rotating the device which causes that all options except for the selected one disappear from Dropdown Menu.

Steps to reproduce:

Open Material Catalog app
Go to TextField -> Exposed Dropdown Menu Demo
Tap on 4th TextField from the top and select any value from the dropdown menu.
Rotate the device to landscape and back to portrait
Try to select a value from any of the 4 TextFields

The result is that those Dropdowns are now showing only 1 value instead of all of them.

Expected behavior: All TextField Dropdown Menus should show all values after device rotations

Android API version: Tested on Android 10 and Android 11 Beta

Material Library version: Checked on 1.3.0-alpha01 and 1.2.0-beta01

Device: Google Pixel 3 and Emulator

Hi, you'll want to include a small project that reproduces the issue.

@consp1racy

@consp1racy it's reproducible using Material Catalog sample app.

This is because getFreezesText() returns always true for EditText. After rotation setText(CharSequence) is called in TextView#onRestoreInstanceState(Parcelable), which by default does the filtering.

I workaround it by overriding getFreezesText() and returning false, but then I have to set the value manually.

public class ExposedDropdownMenu extends MaterialAutoCompleteTextView {

	public ExposedDropDown(@NonNull final Context context, @Nullable final AttributeSet attributeSet) {
		super(context, attributeSet);
	}

	@Override
	public boolean getFreezesText() {
		return false;
	}
}

same problem here, hoping for a fix in the next version 👍

I have a same bug when i back via navigation component on my fragment where i allready select some item in dropdown
autoCompleteTextView.setFreezesText(false) - This not help me
i am avoid bug by next trick:
override fun onPause() {
super.onPause()
etSelectDropdown.setText("",false)
}

FIX: All the values will be visible after the device rotation and also the selected value will be displayed.

public class TextInputDropDownMenu extends AppCompatAutoCompleteTextView {

    public TextInputDropDownMenu(@NonNull Context context) {
        super(context);
    }

    public TextInputDropDownMenu(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public TextInputDropDownMenu(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    {
        setInputType(InputType.TYPE_NULL);
    }

    @Override
    public boolean getFreezesText() {
        return false;
    }

    @Override
    public Parcelable onSaveInstanceState() {
        Parcelable parcelable = super.onSaveInstanceState();
        if (TextUtils.isEmpty(getText())) {
            return parcelable;
        }

        CustomSavedState customSavedState = new CustomSavedState(parcelable);
        customSavedState.text = getText().toString();
        return customSavedState;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        if (!(state instanceof CustomSavedState)) {
            super.onRestoreInstanceState(state);
            return;
        }

        CustomSavedState customSavedState = (CustomSavedState) state;
        setText(customSavedState.text, false);
        super.onRestoreInstanceState(customSavedState.getSuperState());
    }

    private static final class CustomSavedState extends BaseSavedState {

        private String text;

        public CustomSavedState(Parcelable superState) {
            super(superState);
        }

        public CustomSavedState(Parcel source) {
            super(source);
            text = source.readString();
        }

        @Override
        public void writeToParcel(Parcel out, int flags) {
            super.writeToParcel(out, flags);
            out.writeString(text);
        }

        private static final Creator<CustomSavedState> CREATOR = new Creator<CustomSavedState>() {
            @Override
            public CustomSavedState createFromParcel(Parcel source) {
                return new CustomSavedState(source);
            }

            @Override
            public CustomSavedState[] newArray(int size) {
                return new CustomSavedState[size];
            }
        };

    }

}

Thanks , It helps me a lot.

@ar-arvind
Your solution produces a crash while testing it agains the process death scenario (Terminate Application button in android studio, for example):

2020-10-21 11:32:30.553 14482-14482/com.example.sample E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.sample, PID: 14482
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sample.MainActivity}: java.lang.RuntimeException: Parcel android.os.Parcel@aae25dd: Unmarshalling unknown type code 7209033 at offset 2716
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
        at android.app.ActivityThread.-wrap12(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
     Caused by: java.lang.RuntimeException: Parcel android.os.Parcel@aae25dd: Unmarshalling unknown type code 7209033 at offset 2716
        at android.os.Parcel.readValue(Parcel.java:2444)
        at android.os.Parcel.readSparseArrayInternal(Parcel.java:2813)
        at android.os.Parcel.readSparseArray(Parcel.java:2068)
        at android.os.Parcel.readValue(Parcel.java:2422)
        at android.os.Parcel.readArrayMapInternal(Parcel.java:2732)
        at android.os.BaseBundle.unparcel(BaseBundle.java:269)
        at android.os.Bundle.getSparseParcelableArray(Bundle.java:934)
        at androidx.fragment.app.FragmentStateManager.restoreState(FragmentStateManager.java:236)
        at androidx.fragment.app.FragmentManager.restoreSaveState(FragmentManager.java:2473)
        at androidx.fragment.app.FragmentController.restoreSaveState(FragmentController.java:196)
        at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:287)
        at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:115)
        at com.example.sample.MainActivity.onCreate(MainActivity.kt:12)
        at android.app.Activity.performCreate(Activity.java:6679)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6119) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

are there any updates on this issue?
additionally, i get a "mini-bug" (not sure if this is expected behavior) that the autocomplete menu pops up when i change the configuration and the autocomplete textview is selected.

Is there any update on this issue?

Is there any update on this issue ?

For a simple pick list the following seems to work -- define a new ArrayAdapter.

In Korlin it is used as follows:

        val arrayAdapterFilterControl = ArrayAdapterFilterControl(
            requireContext(), R.layout.spinner_list_item, fvm.mimeTypeList
        )
        arrayAdapterFilterControl.setNeverFilter(true)

It also allows you to skip the false parameter setting in ```setText("Choice") and not truncate your selection list:

        ui.mimeTypeMenu.setText(fvm.mimeType.value)

The never filter adapter is a trivial extension to ArrayAdapter

package com.hanafey.android.weedkiller;

import android.content.Context;
import android.widget.ArrayAdapter;
import android.widget.Filter;

import androidx.annotation.NonNull;

import java.util.List;

public class ArrayAdapterFilterControl<T> extends ArrayAdapter<T> {
   // ...
    public ArrayAdapterFilterControl(@NonNull Context context, int resource, @NonNull T[] objects) {
        super(context, resource, objects);
    }
   // ...
    private Boolean neverFilter = false;

    public void setNeverFilter(Boolean state) {
        neverFilter = state;
    }

    @NonNull
    @Override
    public Filter getFilter() {
        if (!neverFilter) {
            return super.getFilter();
        } else {
            return new NeverFilter();
        }
    }

    private class NeverFilter extends Filter {
        protected FilterResults performFiltering(CharSequence prefix) {
            final FilterResults results = new FilterResults();
            return results;
        }

        protected void publishResults(CharSequence constraint, FilterResults results) {
            if (ArrayAdapterFilterControl.this.getCount() > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    }
}

import android.content.Context
import android.os.Parcelable
import android.util.AttributeSet
import com.google.android.material.textfield.MaterialAutoCompleteTextView

class MaterialAutoCompleteTextViewPatch @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = com.google.android.material.R.attr.autoCompleteTextViewStyle
) : MaterialAutoCompleteTextView(context, attrs, defStyleAttr) {

    override fun onRestoreInstanceState(state: Parcelable) {
        val threshold = getThreshold()
        // Make filter invalid temporarily
        setThreshold(Integer.MAX_VALUE)
        super.onRestoreInstanceState(state)
        setThreshold(threshold)
    }

}

can be simplified:

import android.content.Context
import android.os.Parcelable
import android.util.AttributeSet
import com.google.android.material.textfield.MaterialAutoCompleteTextView

class MaterialAutoCompleteTextViewPatch @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = androidx.appcompat.R.attr.autoCompleteTextViewStyle
) : MaterialAutoCompleteTextView(context, attrs, defStyleAttr) {
    override fun onRestoreInstanceState(state: Parcelable) {
        val tmp = threshold
        // Make filter invalid temporarily
        threshold = Integer.MAX_VALUE
        super.onRestoreInstanceState(state)
        threshold = tmp
    }
}

[Catalog] workaround for material-components#1464 ([Exposed Dropdown …

[TextField] Fix the issue that menu items gets filtered after recreation

76dce73

76dce73

Why was this fix reverted in 1.13.0-alpha11? This issue still persists and 1.13.0-alpha10 is the only version that works properly.

@drchen

76dce73

Why was this fix reverted in 1.13.0-alpha11? This issue still persists and 1.13.0-alpha10 is the only version that works properly.

I don't know.
@drchen, do you know?

The fix broke some apps who are implementing their own saved state logic. We need to figure out a better solution unfortunately.

I also reported this to the Issue Tracker: https://issuetracker.google.com/issues/322066510

Status: Assigned -> Won't Fix (Obsolete)

The fix broke some apps who are implementing their own saved state logic. We need to figure out a better solution unfortunately.

Can you provide "a minimal sample app that reproduces the issue"?

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[Exposed Dropdown Menu] Filtering incorrectly applied after rotation #1464

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[Exposed Dropdown Menu] Filtering incorrectly applied after rotation #1464

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consp1racy commented on Jul 5, 2020

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