i use this a s surface view in my application and now i want to add text view to this programmatically. How can i do that.
"<com.csfcse.udrawer.UdrawerDrawingSurface
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/drawingSurface"
android:layout_gravity="left" />"
Thanks......
An option may be to have a FrameLayout with two children, first the SurfaceView, then whatever you want to overlay on the SurfaceView. In the sample below, the second View in the FrameLayout is a horozontil LinearLayout with a Button and a TextView. The FrameLayout displays all its children as piled in Z order with the first child at the bottom and all children positioned at the upper left corner. In this case the LinearLayout has Gravity.CENTER_VERTICAL (I think you could do the same thing with padding on the LinearLayout.
I have never found much (good) documentation about how SurfaceViews (or any of the screen drawing) works. There may be a problem with flickering or refresh, but I don't see much problem on my Froyo Evo. (This test app draws 'twirling' lines on the SurfaceView below the Button and TextView.
If the question is simply: How do you programmatically add a TextView to a Layout that was created by a XML inflated Layout, then, get a reference to the Layout instance and call addView() to it.
Layout lay = parentLayo.findViewById(R.id.drawingSurfaceParent);
TextView tv = new TextView(this);
tv.setText("New textview");
lay.addView(tv);
You'll need to use the Canvas and a corresponding text draw method:
drawText(String text, int index, int count, float x, float y, Paint paint).
This is not possible, a SurfaceView cannot contain other Views.
Related
I've been making all of my views dynamically, and now I've come to the point where I want to add an EditText for people to write in.
I've been able to accomplish this for the most part, but it doesn't look right. I have a linear layout that I'm adding a relative layout to. I'm making the relative layout have a white background, then adding the EditText. Problem is, it always adds it to the direct center of the relative layout, and options to align it vertically to the top have so far failed.
I also need to be able to pull the text from it later when a separate button was pressed (I know how to make the button work, it's the pulling text from it part I'm a bit iffy on). Here's my code so far:
public void addEditText(LinearLayout L){
EditText myEditText = new EditText(c);
myEditText.setSingleLine(false);
RelativeLayout l1 = new RelativeLayout(c);
LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(scWidth1, 300);
lp.gravity=Gravity.CENTER;
l1.setLayoutParams(lp);
l1.setBackgroundColor(Color.WHITE);
l1.setGravity(Gravity.CENTER_VERTICAL);
l1.addView(myEditText);
L.addView(l1);
}
l1.setGravity(Gravity.CENTER_VERTICAL); places the EditText in center vertical of the parent container i.e RelativeLayout, remove that line.
I'm working with TextViews progammatically and I need to dynamically add new views and set their left/top position in the RelativeLayout parent.
What I'm doing is something like this:
RelativeLayout global=(RelativeLayout)findViewById(R.id.global);
TextView view=(TextView)findViewById(R.id.root);
RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
final TextView childView=new TextView(view.getContext());
lp.addRule(RelativeLayout.ABOVE, view.getId());
childView.setLayoutParams(lp);
childView.setId(childView.getId()+1);
childView.setText("TRY STRING");
childView.setTextSize(view.getTextSize());
childView.setWidth(view.getWidth());
childView.setLeft(view.getLeft()+interval);
global.addView(childView);
Basically, I have a textview in a certain position (which is called view) and I'm trying to create a new textview above the existing one and on the same left position.
Although the getLeft() method correctly returns the left position of view, childView happens to have the left field set to zero, and appears at the left end of the screen when i add it to the RelativeLayout.
It looks like it's completely ignoring the setLeft method!
Can anyone explain why?
Thank you very much in advance!
public final void setLeft (int left)
Added in API level 11
Sets the left position of this view relative to its parent. This method is meant to be called by the layout system and should not generally be called otherwise, because the property may be changed at any time by the layout.
Parameters
left The bottom of this view, in pixels.
most likely the left value is being set by the layout every time it is drawn and overrides the value that you are setting on your view.
android layouts are very XML ish even when doing it programmatically.
try using
lp.setMargins(int left, int top, int right, int bottom);
..or some other method that won't be undone when the layout is drawn
How can I retain attributes of the children in a RelativeLayout when dynamically adding ImageViews?
I have a custom ImageView I want to add at runtime to an empty RelativeLayout (nothing inside in XML), I can add the first, then move, scale and rotate them, it works fine.
When I add another ImageView all previously added instances loose their position and their size, but when I touch them they get back just their size, not the position.
In my ImageView I'm overriding onDraw and onTouch, do I need to override something else?
Maybe I have to write my own RelativeLayout implementation? I wouldn't!
This is the pseudocode for adding new ImageView:
create new instance of ImageView
set bitmap
set scaletype
add imageview to the RelativeLayout container
I even tried to set a standard layout parameter for the brand new added ImageView with the same result.
I tried to get the margins for every children, based on its position, and the re set the layout with ImgeView.setLayout(l, t, r, b);
no success...
Here's the XML RelativeLayout container, pretty simple, maybe too much?
<RelativeLayout
android:id="#+id/face_container"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</RelativeLayout>
Do you need more details to help me? Please ask, I can post the code too, but I have to clean it up a bit before, I can do it tomorrow, in the meantime please give me some advice.
In a RelativeLayout all view positions are related to the others views. So, as you do in xml, you should provide for each view the relative parameters.
Before add imageView to the RelativeLayout call setLayoutParams(layoutParams):
// Create a new RelativeLayout.LayoutParams instance
RelativeLayout.LayoutParams layoutParams =
new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
// add roules
layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
layoutParams.addRule(.........
layoutParams.addRule(.........
//add params to view
imageView.setLayoutParams(layoutParams);
//add imageview to the RelativeLayout container
yourRelativeLayout.addView(imageView);
Look here for all rules.
hi I have 2 layout inside a framelayout and i want one linearlayout at top and another at bottom where i will specify height for both the layouts
and how to set this parameter for the linearLayout "layout_gravity " by code not by XML
Use a surfaceView , the SurfaceView allows you to stack in the Z order.
Docs
make sure your surfaceView is under the views of the views you want to stack.
Hope this helps
first fetch the layout from id.
LinearLayout layout = (LinearLayout)findViewById(R.id.IDOFLAYOUT);
//the set the gravity by this method
layout.setGravity(Gravity.CENTER);
I have a TextView that I created in the main.xml. In my app.java I am dynamically positioning that TextView based on where the user taps the screen. The problem I am having is that when I call myTextView.setPadding(100,100,0,0), it moves the actual Text of the TextView, but does not move the Colored Background of the TextView.
Ideas?
The padding only affect the contents of the View, you could embed your View inside a LinearLayout and change the padding of the LinearLayout to move the TextView.
If you want to move the entire contents you might want to use margins instead.
You may use animation to move a view.
Animation a = new TranslateAnimation((oldPos),
newPos, 0.0f, 0.0f);
a.setDuration(300);
a.setStartOffset(100);
a.setRepeatMode(Animation.ABSOLUTE);
a.setFillAfter(true);
a.setInterpolator(AnimationUtils.loadInterpolator(this.getContext(),
android.R.anim.accelerate_decelerate_interpolator));
View.startAnimation(a);