Android “tools” namespace in layout xml documentation
We’ve just added support for designtime attributes like this in Android Studio 0.2.11. See http://tools.android.com/tips/layout-designtime-attributes for more.
android-layout
How to create android app with app widget in single application
Create and configure widget To register a widget you create a BroadcastReceiver with an intent filter for the android.appwidget.action.APPWIDGET_UPDATE action. <receiver android:icon=”@drawable/icon” android:label=”Example Widget” android:name=”MyWidgetProvider” > <intent-filter > <action android:name=”android.appwidget.action.APPWIDGET_UPDATE” /> </intent-filter> <meta-data android:name=”android.appwidget.provider” android:resource=”@xml/widget_info” /> </receiver> You also specify the meta-data for the widget via the android:name=”android.appwidget.provider attribute. The configuration file referred by this … Read more
Define list view with static elements on android in xml?
Unfortunately, list view definition via xml is forbidden. Mess with adapters is required instead.
How to add scroll bar to the Relative Layout?
hi see the following sample code of xml file. <ScrollView xmlns:android=”http://schemas.android.com/apk/res/android” android:id=”@+id/ScrollView01″ android:layout_width=”fill_parent” android:layout_height=”fill_parent” > <RelativeLayout android:id=”@+id/RelativeLayout01″ android:layout_width=”fill_parent” android:layout_height=”fill_parent” > <LinearLayout android:id=”@+id/LinearLayout01″ android:layout_width=”fill_parent” android:layout_height=”fill_parent” android:orientation=”vertical” > <TextView android:id=”@+id/TextView01″ android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:layout_margin=”20dip” android:text=”@+id/TextView01″ > </TextView> <TextView android:id=”@+id/TextView01″ android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:layout_margin=”20dip” android:text=”@+id/TextView01″ > </TextView> <TextView android:id=”@+id/TextView01″ android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:layout_margin=”20dip” android:text=”@+id/TextView01″ > </TextView> <TextView android:id=”@+id/TextView01″ android:layout_width=”wrap_content” android:layout_height=”wrap_content” android:layout_margin=”20dip” … Read more
Can’t form a chain between two views/widgets in Android Studio
I was trying to figure this out too. I’ve discovered that one way to do it is to select both views, then right click and select Center Horizontally. This creates the chain, but then you have to adjust any other constraints accordingly. I’m new to Android, so I’m sure there will be other ways….
Android getMeasuredHeight returns wrong values !
You’re calling measure incorrectly. measure takes MeasureSpec values which are specially packed by MeasureSpec.makeMeasureSpec. measure ignores LayoutParams. The parent doing the measuring is expected to create a MeasureSpec based on its own measurement and layout strategy and the child’s LayoutParams. If you want to measure the way that WRAP_CONTENT usually works in most layouts, call … Read more
How to stretch three images across the screen preserving aspect ratio?
Got it working! But as I said above, you need to create your own class. But it is pretty small. I created it with the help of this Bob Lee’s answer in this post: Android: How to stretch an image to the screen width while maintaining aspect ratio? package com.yourpackage.widgets; import android.content.Context; import android.util.AttributeSet; import … Read more
android meaning of @null in xml attribute
If I remember correctly, omitting the background attribute sets a default background. However, explicitly setting background to “@null” removes the background, causing whatever is below the element to be shown. In particular, if you for instance set the background of a Button to null, the border of the button will also be gone (and the … Read more
This view is not constrained vertically. At runtime it will jump to the left unless you add a vertical constraint
From Android Studio v3 and up, Infer Constraint was removed from the dropdown. Use the magic wand icon in the toolbar menu above the design preview; there is the “Infer Constraints” button. Click on this button, this will automatically add some lines in the text field and the red line will be removed.