xml – android image button tooltip-ThrowExceptions

Exception or error:

I’m trying to build an app with image buttons that work like the action bar but i can’t get them to show a tooltip on long press.

   <ImageButton
        android:id="@+id/editUrgent"
        style="?android:attr/borderlessButtonStyle"
        android:layout_width="48dp"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_toLeftOf="@+id/editImportant"
        android:hint="@string/hint_urgent"
        android:contentDescription="@string/hint_urgent"
        android:text="@string/hint_urgent"
        android:src="@drawable/clock_light" />

android:contentDescription works for hovering(s-pen) but long press still does nothing.

How to solve:

With api level 26 you can use the built-in TooltipText:
Via XML:

android:toolTipText="yourText"

ViewCompatDocs

If your minSdk is below 26, use ToolTipCompat, for example:

TooltipCompat.setTooltipText(yourView, "your String");

Unfortunately, there’s is no way to do this in your XML-File.

###

This is the code that Support Library v7 uses to show “cheat sheet”s for action menu items:

public boolean onLongClick(View v) {
    if (hasText()) {
        // Don't show the cheat sheet for items that already show text.
        return false;
    }

    final int[] screenPos = new int[2];
    final Rect displayFrame = new Rect();
    getLocationOnScreen(screenPos);
    getWindowVisibleDisplayFrame(displayFrame);

    final Context context = getContext();
    final int width = getWidth();
    final int height = getHeight();
    final int midy = screenPos[1] + height / 2;
    int referenceX = screenPos[0] + width / 2;
    if (ViewCompat.getLayoutDirection(v) == ViewCompat.LAYOUT_DIRECTION_LTR) {
        final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
        referenceX = screenWidth - referenceX; // mirror
    }
    Toast cheatSheet = Toast.makeText(context, mItemData.getTitle(), Toast.LENGTH_SHORT);
    if (midy < displayFrame.height()) {
        // Show along the top; follow action buttons
        cheatSheet.setGravity(Gravity.TOP | GravityCompat.END, referenceX, height);
    } else {
        // Show along the bottom center
        cheatSheet.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, height);
    }
    cheatSheet.show();
    return true;
}

###

Not exactly what you are looking for but it does something very similar.

1) Insure your view is android:longClickable="true" (should be by default) and has a defined content description android:contentDescription="@string/myText":

<ImageButton android:id="@+id/button_edit"
     android:contentDescription="@string/myText"
     android:src="@drawable/ic_action_edit"
     android:onClick="onEdit"
     android:longClickable="true"/>

2) Register a callback to be invoked when the view is long pressed. Handler will display the content description as a toast message.

findViewById(R.id.button_edit).setOnLongClickListener(new View.OnLongClickListener() {

            @Override
            public boolean onLongClick(View view) {
                Toast.makeText(context,view.getContentDescription(), Toast.LENGTH_SHORT).show();
                return true;
            }
        });

Leave a Reply

Your email address will not be published. Required fields are marked *