android-layoutparams | 易学教程

How to set background of collapsing toolbar with custom behavior to fit whole screen

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问题 I'm following nice repo which shows how to make custom behavior of collapsing toolbar WhatsApp-ProfileCollapsingToolbar. What I don't like is when picture below toolbar (toolbar's font is white) is white then toolbar is not visible. So I'm trying to set background of toolbar to some color. First I added to widget_header_view.xml android:background="@android:color/holo_red_light" and now I have it like: <?xml version="1.0" encoding="utf-8"?> <com.anton46.whatsapp_profile.HeaderView xmlns

How to add and remove layout behavior programmatically to LinearLayout

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问题 You can add the app:layout_behavior="@string/appbar_scrolling_view_behavior" behavior to a LinearLayout in the XML declaration but I haven't found a way to do the same in code. With a CoordinatorLayout you can call CoordinatorLayout.LayoutParams.setBehavior() but this method isn't available on LinearLayout.LayoutParams . Is there a way to do something similar for LinearLayout ? 回答1: You're misunderstanding LayoutParams concept a bit. LayoutParams object is related to the enclosing ViewGroup ,

How to add and remove layout behavior programmatically to LinearLayout

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How to change width and height of existing layout params

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问题 Please consider ImageView inside RelativeLayout it has some specific layout params for RelativeLayout . I need to change the width and height of my ImageView programatically according to the screen size. How can I save all layout parameters but only change width and height Following code creates empty layout params but I need to save my old params and change only height and width. imageViewArticleImage.setLayoutParams(new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,

WindowManager.addView ontop(overlay) of soft key OR nav bar

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问题 I saw an app that overlays whole screen including nav bar (or soft-key that has back, home, etc.) today. it's CF.Lumen(requires android 4.4+) by chainfire. I just remembered this is NOT POSSIBLE on general approach and many SO answers told me. So I looked down smali codes from Lumens apk(sorry chainfire), found 0x7d6 as type specifier, which is TYPE_SYSTEM_OVERLAY . In general, this makes a view overlays on top of lock screen. It looks good however it won't overlays nav bar area. even on lock

Cannot resize linear layout children in android react native module

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问题 Full code here Video of correct behavior in java and incorrect in react native here I have modified a linear layout to respond to touch by resizing the left child while the right child takes up the rest of the space, simulating a horizontal scroll that can be 'opened' or 'closed' using the following code LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) leftView.getLayoutParams(); //Log.d("ll","width " + newWidth); lp.width=newWidth; leftView.setLayoutParams(lp); In react native,

Android: permission denied for window type 2038 using TYPE_APPLICATION_OVERLAY

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问题 I trying to create a view that is above other applications: WindowManager.LayoutParams paramsDirectorView = new WindowManager.LayoutParams( WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT); I have looked in other responses and found the following things for "drawing over applications": I have android.permission.SYSTEM_ALERT_WINDOW in the

Setting margin programmatically to CardView

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问题 I have a CardView in my XML layout and I need to set margins to it programmatically (This is because I don't need margin at all times. Based on few conditions, I either set or remove the margin). Here's how I did it: CardView.LayoutParams layoutParams = (CardView.LayoutParams) myCardView.getLayoutParams(); layoutParams.setMargins(0, 0, SystemHelper.dpToPx(2), 0); myCardView.setLayoutParams(layoutParams); This worked fine. It put 2dp margin at the bottom of my CardView . However, I get this in

Android Windows: When and how are they created?

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问题 I have read the standard Windows-related documentation and pawed through a bunch of the source code in an attempt to understand how and when Android Windows are created. I believe I have my arms around it and would like to have it verified or corrected. To my knowledge, there are only two ways to get a handle to a Window object. 1. Activity's getWindow. 2. Dialog's getWindow method. In both of the above cases, you can get a handle to the Window using getWindow and then manipulate the Window

How to set background of collapsing toolbar with custom behavior to fit whole screen

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I'm following nice repo which shows how to make custom behavior of collapsing toolbar WhatsApp-ProfileCollapsingToolbar . What I don't like is when picture below toolbar (toolbar's font is white) is white then toolbar is not visible. So I'm trying to set background of toolbar to some color. First I added to widget_header_view.xml android:background="@android:color/holo_red_light" and now I have it like: <?xml version="1.0" encoding="utf-8"?> <com.anton46.whatsapp_profile.HeaderView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout