Stop EditText from gaining focus at Activity start

2018-12-31 01:33发布

I have an Activity in Android, with two elements:

  1. EditText
  2. ListView

When my Activity starts, the EditText immediately has input focus (flashing cursor). I don't want any control to have input focus at startup. I tried:

EditText.setSelected(false);

No luck. How can I convince the EditText to not select itself when the Activity starts?

30条回答
长期被迫恋爱
2楼-- · 2018-12-31 01:56

The following will stop edittext from taking focus when created, but grab it when you touch them.

<EditText
    android:id="@+id/et_bonus_custom"
    android:focusable="false" />

So you set focusable to false in the xml, but the key is in the java, which you add the following listener:

etBonus.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        v.setFocusable(true);
        v.setFocusableInTouchMode(true);
        return false;
    }
});

Because you are returning false, i.e. not consuming the event, the focusing behavior will proceed like normal.

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琉璃瓶的回忆
3楼-- · 2018-12-31 01:59

Excellent answers from Luc and Mark however a good code sample is missing. Adding the tag android:focusableInTouchMode="true" to <LinearLayout> like the following example will fix the problem.

<!-- Dummy item to prevent AutoCompleteTextView from receiving focus -->
<LinearLayout
    android:focusable="true" 
    android:focusableInTouchMode="true"
    android:layout_width="0px" 
    android:layout_height="0px"/>

<!-- :nextFocusUp and :nextFocusLeft have been set to the id of this component
to prevent the dummy from receiving focus again -->
<AutoCompleteTextView android:id="@+id/autotext"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:nextFocusUp="@id/autotext" 
    android:nextFocusLeft="@id/autotext"/>
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伤终究还是伤i
4楼-- · 2018-12-31 02:02

Being that I don't like to pollute the XML with something that is related to functionality, I created this method that "transparently" steals the focus from the first focusable view and then makes sure to remove itself when necessary!

public static View preventInitialFocus(final Activity activity)
{
    final ViewGroup content = (ViewGroup)activity.findViewById(android.R.id.content);
    final View root = content.getChildAt(0);
    if (root == null) return null;
    final View focusDummy = new View(activity);
    final View.OnFocusChangeListener onFocusChangeListener = new View.OnFocusChangeListener()
    {
        @Override
        public void onFocusChange(View view, boolean b)
        {
            view.setOnFocusChangeListener(null);
            content.removeView(focusDummy);
        }
    };
    focusDummy.setFocusable(true);
    focusDummy.setFocusableInTouchMode(true);
    content.addView(focusDummy, 0, new LinearLayout.LayoutParams(0, 0));
    if (root instanceof ViewGroup)
    {
        final ViewGroup _root = (ViewGroup)root;
        for (int i = 1, children = _root.getChildCount(); i < children; i++)
        {
            final View child = _root.getChildAt(i);
            if (child.isFocusable() || child.isFocusableInTouchMode())
            {
                child.setOnFocusChangeListener(onFocusChangeListener);
                break;
            }
        }
    }
    else if (root.isFocusable() || root.isFocusableInTouchMode())
        root.setOnFocusChangeListener(onFocusChangeListener);

    return focusDummy;
}
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公子世无双
5楼-- · 2018-12-31 02:02

For me, what worked on all devices is this:

    <!-- fake first focusable view, to allow stealing the focus to itself when clearing the focus from others -->

    <View
    android:layout_width="0px"
    android:layout_height="0px"
    android:focusable="true"
    android:focusableInTouchMode="true" />

Just put this as a view before the problematic focused view, and that's it.

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不再属于我。
6楼-- · 2018-12-31 02:03

I needed to clear focus from all fields programmatically. I just added the following two statements to my main layout definition.

myLayout.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
myLayout.setFocusableInTouchMode(true);

That's it. Fixed my problem instantly. Thanks, Silver, for pointing me in the right direction.

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春风洒进眼中
7楼-- · 2018-12-31 02:05

A simpler solution exists. Set these attributes in your parent layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainLayout"
    android:descendantFocusability="beforeDescendants"
    android:focusableInTouchMode="true" >

And now, when the activity starts this main layout will get focus by default.

Also, we can remove focus from child views at runtime (e.g., after finishing child editing) by giving the focus to the main layout again, like this:

findViewById(R.id.mainLayout).requestFocus();

Good comment from Guillaume Perrot:

android:descendantFocusability="beforeDescendants" seems to be the default (integer value is 0). It works just by adding android:focusableInTouchMode="true".

Really, we can see that the beforeDescendants set as default in the ViewGroup.initViewGroup() method (Android 2.2.2). But not equal to 0. ViewGroup.FOCUS_BEFORE_DESCENDANTS = 0x20000;

Thanks to Guillaume.

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