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This view is not constrained, it only has designtime positions, so it will jump to (0,0) unless you add constraints.
The layout editor allows you to place widgets anywhere on the canvas, and it records the current position with designtime attributes (such as layout_editor_absoluteX.) These attributes are not applied at runtime, so if you push your layout on a device, the widgets may appear in a different location than shown in the editor. To fix this, make sure a widget has both horizontal and vertical constraints by dragging from the edge connections.
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To fix this, make sure a widget has both horizontal and vertical constraints by dragging from the edge connections.
To resolve this error, you need to add constraints to the Button view that fulfills the minimum requirement of the ConstraintLayout view. You can do this in two ways: Using the Infer Constraints option from the Design window's toolbar. Using the Constrain option from the View 's context menu.
Constraint errors Without constraints, the objects in your app would likely jump out of position when the app is loaded or the device is rotated. To automatically apply any missing constraints you can press the 'Infer Constraints' button at the top of the editor.
Instead of adding constraints to every view as you place them in the layout, you can move each view into the positions you desire, and then click Infer Constraints to automatically create constraints. Infer Constraints scans the layout to determine the most effective set of constraints for all views.
This may help someone. I am using Android Studio 3.1 and i faced same problem but i didn't find these options (Constraint Layout -> Infer Layout) as suggested in the above answer. Then after carefully checking i found "Infer Constraint" option above the layout window (refer to screenshot below in step 1)
Step 1: Click on "Infer Constraint". This may solve your problem, but if your widget still not visible (as in my case), then follow step 2.
Step 2: Click on "AppTheme" and select "NoTitleBar" theme as selected in the screenshot
This solved my problem.
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Right click on design layout in Android Studio, then select "Constrain Layout" and sub menu is open, then select "infer Layout" and compile your App.
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