This switches the component to match constraint mode causing the widget to resize based on the constraints applied to it: With the ListView still selected, set the layout_width and layout_height properties to 0dp. Repeat these steps to attach the left and right-hand edges of the ListView to the corresponding sides of the parent, and to attach the bottom edge of the ListView to the top of the EditText widget. This will establish a constraint from the top of the ListView to the top of the parent ConstraintLayout. With the ListView component selected in the layout, use the Properties tool window to change the ID to dataListView.Ĭlick and drag from the constraint anchor located in the center of the top edge of the ListView to the top edge of the parent container and release. Begin by dragging, dropping, positioning and sizing the widgets on the layout canvas so that the layout resembles that shown in Figure 25-1: The completed layout for the user interface is going to consist of a ListView, a Plain Text EditText and three Button views. Before adding any components to the view, turn off Autoconnect mode. Begin by selecting and deleting the default “Hello World!” TextView widget so that the layout canvas is blank. Once Android Studio has finished creating the new project, locate the activity_realtime_dblist.xml layout file and load it into the layout editor.
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