Material-components-android: [TextInputLayout] [Exposed Dropdown Menu] Set a default selection

Created on 11 Feb 2020 · 13Comments · Source: material-components/material-components-android

Description: I am going to select default selection programmatically but its not working.

but none of them working.

Source code:
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">

<com.google.android.material.textfield.TextInputLayout
    style="@style/Widget.MaterialComponents.TextInputLayout.FilledBox.ExposedDropdownMenu"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="hint_text">

    <AutoCompleteTextView
        android:id="@+id/filled_exposed_dropdown"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</com.google.android.material.textfield.TextInputLayout>

     var eqList = ArrayList<String>()
      eqList.add(getString(R.string.linear_equation))
     eqList.add(getString(R.string.quad_equation))
      eqList.add(getString(R.string.cubic_equation))
      val eqAdapter = ArrayAdapter<String>(this,
            R.layout.row_spinner_item, eqList)
     eqAdapter.setDropDownViewResource(R.layout.row_spinner_dropdown_item)
     filled_exposed_dropdown.setAdapter(eqAdapter)
    filled_exposed_dropdown.listSelection = 0    // Not working
    filled_exposed_dropdown.setSelection(0)     // Not working

Material Library version: 1.2.0-alpha04

Device: All

bug

Source

Slake07

Most helpful comment

Hi, since the menu uses an AutoCompleteTextView, the way to set a default selection is by calling setText(CharSequence text, boolean filter), with the filter=false to have the filtering off. Will update the documentation with this info.

So you'd do something like:
filled_exposed_dropdown.setText(eqAdapter.getItem(0).toString(), false);

note that this won't survive configuration changes. after a configuration change the item is selected again, but with filtering. items not matching the filter aren't visible anymore.

wondering639 on 9 Mar 2020

👍3

All 13 comments

Hi, since the menu uses an AutoCompleteTextView, the way to set a default selection is by calling setText(CharSequence text, boolean filter), with the filter=false to have the filtering off. Will update the documentation with this info.

So you'd do something like:
filled_exposed_dropdown.setText(eqAdapter.getItem(0).toString(), false);

leticiarossi on 9 Mar 2020

👍2

Hi, since the menu uses an AutoCompleteTextView, the way to set a default selection is by calling setText(CharSequence text, boolean filter), with the filter=false to have the filtering off. Will update the documentation with this info.

So you'd do something like:
filled_exposed_dropdown.setText(eqAdapter.getItem(0).toString(), false);

note that this won't survive configuration changes. after a configuration change the item is selected again, but with filtering. items not matching the filter aren't visible anymore.

wondering639 on 9 Mar 2020

👍3

@wondering639 Anyway to the make filter visible on configuration change ? I am facing similar issue when I go back to the fragments with navigation components, the filter options are not visible anymore.

subashz on 11 May 2020

@blacpythoz I solved (workaround) it by creating a non filtering adapter as described in this article: https://medium.com/@rmirabelle/there-is-no-material-design-spinner-for-android-3261b7c77da8

wondering639 on 12 May 2020

👍1

@wondering639 is right. setting filtering to false doesn't survive configuration change. I doubt that this is intended behavior.

qrezet on 20 Jun 2020

Ref: #1464

philips77 on 31 Jul 2020

@qrezet @wondering639

filled_exposed_dropdown.setText(eqAdapter.getItem(0).toString(), false);

note that this won't survive configuration changes. after a configuration change the item is selected again, but with filtering. items not matching the filter aren't visible anymore.

You can use

filled_exposed_dropdown.setFreezesText(false);

The EditText sets the freezesText=true. Due to this value after the rotation the TextView#onRestoreInstanceState(Parcelable) calls autoCompleteTextView.setText(value,true) which applies a filter to the adapter values.

gabrielemariotti on 16 Aug 2020

@gabrielemariotti Thank you, but - without testing it - shouldn't it be autoCompleteTextView.setText(value,false) instead of autoCompleteTextView.setText(value,true)? Because we want _no_ filtering.

wondering639 on 16 Aug 2020

@wondering639 I try to explain better.

To select a default value you have to use:
autoCompleteTextView.setText(value, false);

After a rotation or a configuration change the value is still visible but with filtering. Items not matching the filter aren't visible anymore. It happens because the TextView#onRestoreInstanceState(Parcelable) calls autoCompleteTextView.setText(value,true) and you can't change it. You can only prevent this call using:

autoCompleteTextView.setFreezesText(false);

In this way the TextView#onRestoreInstanceState(Parcelable) doesn't call autoCompleteTextView.setText(value,true).

gabrielemariotti on 16 Aug 2020

@wondering639 I try to explain better.

To select a default value you have to use:
autoCompleteTextView.setText(value, false);

After a rotation or a configuration change the value is still visible but with filtering. Items not matching the filter aren't visible anymore. It happens because the TextView#onRestoreInstanceState(Parcelable) calls autoCompleteTextView.setText(value,true) and you can't change it. You can only prevent this call using:

autoCompleteTextView.setFreezesText(false);

In this way the TextView#onRestoreInstanceState(Parcelable) doesn't call autoCompleteTextView.setText(value,true).

got it, thanks 👍

wondering639 on 16 Aug 2020

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)
}

audiserg on 2 Oct 2020

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];
            }
        };

    }

}

ar-arvind on 5 Oct 2020

@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)