ViewParents in general can’t remove views, but ViewGroups can. You need to cast your parent to a ViewGroup (if it is a ViewGroup) to accomplish what you want. For example: View namebar = View.findViewById(R.id.namebar); ((ViewGroup) namebar.getParent()).removeView(namebar); Note that all Layouts are ViewGroups.
Use the ViewTreeObserver on the View to wait for the first layout. Only after the first layout will getWidth()/getHeight()/getMeasuredWidth()/getMeasuredHeight() work. ViewTreeObserver viewTreeObserver = view.getViewTreeObserver(); if (viewTreeObserver.isAlive()) { viewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { view.getViewTreeObserver().removeOnGlobalLayoutListener(this); viewWidth = view.getWidth(); viewHeight = view.getHeight(); } }); }
To better understand answers provided by François BOURLIEUX and Dalvik I suggest you take a look at this awesome view lifecycle diagram by Arpit Mathur:
To set constraints of image view to: app:layout_constraintRight_toRightOf=”@+id/check_answer1″ app:layout_constraintTop_toTopOf=”@+id/check_answer1″ use: ConstraintLayout constraintLayout = findViewById(R.id.parent_layout); ConstraintSet constraintSet = new ConstraintSet(); constraintSet.clone(constraintLayout); constraintSet.connect(R.id.imageView,ConstraintSet.RIGHT,R.id.check_answer1,ConstraintSet.RIGHT,0); constraintSet.connect(R.id.imageView,ConstraintSet.TOP,R.id.check_answer1,ConstraintSet.TOP,0); constraintSet.applyTo(constraintLayout); To set constraints of image view to: app:layout_constraintRight_toRightOf=”@+id/check_answer2″ app:layout_constraintTop_toTopOf=”@+id/check_answer2″ use: ConstraintLayout constraintLayout = findViewById(R.id.parent_layout); ConstraintSet constraintSet = new ConstraintSet(); constraintSet.clone(constraintLayout); constraintSet.connect(R.id.imageView,ConstraintSet.RIGHT,R.id.check_answer2,ConstraintSet.RIGHT,0); constraintSet.connect(R.id.imageView,ConstraintSet.TOP,R.id.check_answer2,ConstraintSet.TOP,0); constraintSet.applyTo(constraintLayout);
Android id overview An Android id is an integer commonly used to identify views; this id can be assigned via XML (when possible) and via code (programmatically.) The id is most useful for getting references for XML-defined Views generated by an Inflater (such as by using setContentView.) Assign id via XML Add an attribute of … Read more
Use this : public View getViewByPosition(int pos, ListView listView) { final int firstListItemPosition = listView.getFirstVisiblePosition(); final int lastListItemPosition = firstListItemPosition + listView.getChildCount() – 1; if (pos < firstListItemPosition || pos > lastListItemPosition ) { return listView.getAdapter().getView(pos, null, listView); } else { final int childIndex = pos – firstListItemPosition; return listView.getChildAt(childIndex); } }
From what I’ve been able to piece together, you have to add the view using LayoutParams. LinearLayout linearLayout = new LinearLayout(this); RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams( LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); relativeParams.addRule(RelativeLayout.ALIGN_PARENT_TOP); parentView.addView(linearLayout, relativeParams); All credit to sechastain, to relatively position your items programmatically you have to assign ids to them. TextView tv1 = new TextView(this); tv1.setId(1); TextView … Read more
You have to call setContentView(…) BEFORE you attempt to find any of the UI components. You’re trying to find the TextView before you’ve called it. Change your code to this… super.onCreate(savedInstanceState); setContentView(R.layout.other_activity); TextView textView = (TextView)findViewById(R.id.txt02);
I was having this problem also and found this answer: v.setDrawingCacheEnabled(true); // this is the important code 🙂 // Without it the view will have a dimension of 0,0 and the bitmap will be null v.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight()); v.buildDrawingCache(true); Bitmap b = Bitmap.createBitmap(v.getDrawingCache()); v.setDrawingCacheEnabled(false); // clear drawing cache
In android 2.2 you could do the following. Create an xml drawable such as /res/drawable/textlines.xml and assign this as a TextView’s background property. <TextView android:text=”My text with lines above and below” android:background=”@drawable/textlines” /> /res/drawable/textlines.xml <?xml version=”1.0″ encoding=”utf-8″?> <layer-list xmlns:android=”http://schemas.android.com/apk/res/android” > <item> <shape android:shape=”rectangle”> <stroke android:width=”1dp” android:color=”#FF000000″ /> <solid android:color=”#FFDDDDDD” /> </shape> </item> <item android:top=”1dp” android:bottom=”1dp”> … Read more