layoutparams

问题 I need to create a button in Java. Below is my code: Button b = new Button(MyClass.this); b.requestLayout(); LayoutParams lp = b.getLayoutParams(); lp.height = LayoutParams.WRAP_CONTENT; lp.width = LayoutParams.WRAP_CONTENT; b.setLayoutParams(lp); b.setText("bla"); b.setTextSize(16); b.setOnClickListener(myListener); I then add this button to the bottom of a ListView: getListView().addFooterView(b); However this crashes, because getLayoutParams returns null. Even if I create new LayoutParams

问题 Problem Using RelativeLayout.LayoutParams and marginTop before setLayoutParams( params ) . Works on all devices for half a second but some cases it bumps back to top. The view stays centered in the holding view on my Moto X 2014 running Lollipop but not on my Nexus 4 running Lollipop . Opening activity Opens activity The margin is fine and the SurfaceView is centered ~200ms delay The margin resets and its back to top (top of SurfaceView at the top of holder) Closing activity Back pressed

问题 I want to create system overlay view, which detect gestures without blocking other apps. How can i do it (apps like OmniSwipe, Easy Swipe detect gestures without blocking anything)? Below code, which blocking other apps cause of system overlay view. package com.carxsing.anglelockscreen.GestureDetector; public class GestureService extends Service implements GestureOverlayView.OnGesturePerformedListener{ private WindowManager windowManager; private GestureOverlayView GestureOverlay,

问题 I am trying to create a method where each time I click a button, I want the screen to display a Relative Layout box below one that is currently there or create one at the top if there isn't one there and I want it to keep creating them below from each button click. Currently using this method, nothing happens when the button is clicked. Here is the code that I have so far and can someone please help me see what I am doing wrong and what I can do to fix this issue: public void createNewLayout(

问题 I am trying to create a method where each time I click a button, I want the screen to display a Relative Layout box below one that is currently there or create one at the top if there isn't one there and I want it to keep creating them below from each button click. Currently using this method, nothing happens when the button is clicked. Here is the code that I have so far and can someone please help me see what I am doing wrong and what I can do to fix this issue: public void createNewLayout(

问题 Hi I am borrowing Seth's method found here to animate my viewGroups. It works great but in the wrong direction - This is my first time using/extending the Animation class and I cant figure how to decrease the size of my view -This expands it. Below is the class and how I use it. Any help will be greatly appreciated. public class ContainerAnim extends Animation { int targetWidth; View view; boolean opened; public ContainerAnim(View v, int targetWidth, boolean opened) { this.view = v; this

问题 When it comes to change the height of a layout dynamically, I usually set the desired dimensions using LayoutParams like: RelativeLayout myView = (RelativeLayout) v.findViewById(R.id.myView); RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.FILL_PARENT, screenHeight); myView.setLayoutParams(lp); But there is this shorter version as well: myView.getLayoutParams().height = screenHeight; Both are working in my case, I would prefer the second version

问题 When it comes to change the height of a layout dynamically, I usually set the desired dimensions using LayoutParams like: RelativeLayout myView = (RelativeLayout) v.findViewById(R.id.myView); RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.FILL_PARENT, screenHeight); myView.setLayoutParams(lp); But there is this shorter version as well: myView.getLayoutParams().height = screenHeight; Both are working in my case, I would prefer the second version

问题 I have some problems with setting margin! body_content = (LinearLayout) findViewById(R.id.body_content); int gSLength = 2; body_content.setPadding(10, 0, 10, 0); for (int i = 0; i < 1; i++){ FrameLayout fl = new FrameLayout(this); LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, 90); fl.setLayoutParams(params); LinearLayout ll1 = new LinearLayout(this); LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, 30); params1.setMargins(0, 60,

问题 I have a TableLayout and a row with a couple TextViews . I want to find the layout_weight of the TextView but I cant figure out how. I've tried the following: TableRow.LayoutParams lp = tv1.getLayoutParams(); and: ViewGroup.LayoutParams lp = tv1.getLayoutParams(); In the first case I get a type mismatch: "Cannot convert from ViewGroup.LayoutParams to TableRow.LayoutParams", and the second case works fine, however ViewGroup.LayoutParams doesn't have a weight field. All the different types of