Well, I'm making a game that uses a class that extends from SurfaceView to represent the game screen, but it works with buttons, so I'm defining the "buttons panel" on xml and then adding the "GameView" to the LinearLayout, that contains all the stuff, programatically and bringing the "buttons panel" to front, just like this:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LinearLayout rl1 = (LinearLayout)findViewById(R.id.rl1);
rl1.addView(new GameView(this));
SquareLayout sq1 = (SquareLayout)findViewById(R.id.square);
//the control buttons are in another custom layout called "SquareLayout"
sq1.bringToFront();
}
The problem here is that i want the layout that contains the game buttons(the SquareLayout) to fill the half of the height of the RelativeLayout(the activity is set to landscape), i get this morphing the RelativeLayout to a vertical LinearLayout, adding another SquareLayout, and setting both weight's properties to 1, and it's like this:
The problem now is that "bringToFront();" method does not work on LinearLayout, so I can't modify the z of the buttons panel after adding the gameview, so my question is if there's a way to make the buttons panel just like is on the image on a RelativeLayout or a similar method like "bringToFront()" that works on LinearLayout.
Try to invoke the method bringChildToFront(View) on your LinearLayout http://developer.android.com/reference/android/view/ViewGroup.html#bringChildToFront(android.view.View). The parameter will be the view you want to display on top of its siblings.
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.
Let say that I have an layout in res/values named layout1.xml.
In this layout I have only one linear layout (the black one on the picture)
The thing I want to do is to add an array of linear layouts just like on the picture.
The red ones are linearlayout with horizontal orientation that contains 5 other linear layouts.
I want to do everything in code and I want to set an onclick listener to each of the layouts so when one is clicked I want to hide it. Everything needs to be putted in a function that will return a Layout and the this method should take prams for the rows and cols
public LinearLayout getLayout(int rows,int cols){
return the_layout;
}
You make a LinearLayout with the constructor new LinearLayout(context)
You add layouts with parentLayout.addView(childLayout).
You should be able to do the rest.
I am preparing to do an android demonstration of sorts and one of the first apps that i would like to write would be a screen filled with different widgets(which of course are views) but would like to put them on the screen without any layout built to hold them. is this possible or do you have to use a layout to put more than one view(widget) on the screen at once?
So right now i can do something like:
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
TextView view1 = new TextView(this);
view1.setText("I am view one");
setContentView(view1);
}
}
In this case i really havent specified a layout but there doesnt seem to be a way to position multiple widgets on the screen without setting a layout. The purpose of this would be to show why you would want to use layouts. perhaps there is a way to display widgets on the screen without having to call the setContentView method.
You can only add multiple widgets/views to something called a ViewGroup. If you take a look at the documentation you'll see - not surprisingly - that basically all layouts extend this class. Similarly, if you look up the documentation on e.g. a TextView, you'll find that it doesn't extend ViewGroup (it does inherit from View, just like ViewGroup, which means it's on a different branch in the hierarchy tree).
In other words: you will need some sort of a layout in order to display more than a single widget/view at a time. You will also always need an explicit call to setContentView(), unless you use something like a ListActivity or ListFragment that by default creates a layout with a ListView as root.
That being said, your example is actually just a programmatical way of setting the following layout on the activity:
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="I am view one" />
You can do it like this:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FrameLayout frameLayout = new FrameLayout(this);
TextView view1 = new TextView(this);
view1.setText("I am view one");
frameLayout.addView(view1);
// add more widgets into ViewGroup as you want
// then set the viewgroup as content view
setContentView(frameLayout);
}
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);
want to make an Android app that starts with a main layout and when you push a button (called stateButton) that is in this layout the layout changes to a main2 layout containing another button (called boton2), and when you push this one you get back to the first main.
I want to do this in the same activity without creating or starting another one.
Here I show you part of the code:
public class NuevoshActivity extends Activity
implements SensorEventListener, OnClickListener {
private Button stateButton;
private Button boton2;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.stateButton = (Button) this.findViewById(R.id.boton);
this.boton2 = (Button) this.findViewById(R.id.boton2);
stateButton.setOnClickListener(this);
boton2.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if(v==stateButton) {
setContentView(R.layout.main2);
}
else if(v==boton2) {
setContentView(R.layout.main);
}
}
}
The mains only have some images, text views and the buttons.
But I've some troubles. Can't it just be as simple as that or what am I missing or what is wrong?
When you use findViewById, you are actually trying to find a view inside the layout you specified by the setContentView. So using setContentView again and again might bring problems when you are trying to check for buttons.
Instead of using a setContentView, I would add the 2 layouts for the screen as child's for a view-flipper which only shows one child at a time. And you can specify the index of which child to show. The benefit of using a view flipper is that you can easily specify a 'in' and 'out' animation for the view if you need an animation when you switch between views. This is a lot cleaner method then recalling setContentView again and again.
The FrameLayout handles this wonderfully... Use this with the <include... contstruct to load multiple other layouts, then you can switch back and forth between them by using setvisibility(View.VISIBLE); and setVisibility(View.INVISIBLE); on the individual layouts.
For example:
Main XML including two other layouts:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout android:id="#+id/frameLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">
<include android:id="#+id/buildinvoice_step1_layout" layout="#layout/buildinvoice_step1" android:layout_width="fill_parent" android:layout_height="fill_parent"></include>
<include android:id="#+id/buildinvoice_step2_layout" android:layout_width="fill_parent" layout="#layout/buildinvoice_step2" android:layout_height="fill_parent"></include>
</FrameLayout>
Code to switch between layouts:
findViewById(R.id.buildinvoice_step1_layout).setVisibility(View.VISIBLE);
findViewById(R.id.buildinvoice_step2_layout).setVisibility(View.INVISIBLE);
You will also need to set the visibility of the individual layouts when the activity starts (or in XML) otherwise you will see them both - one on top of the other.
Your boton2 button will be NULL because the definition of the button is in main2.xml.
The only views you will be able to find are the views which are defined in main.xml.
Thanks!!! All the info was usefull to understand a lot of things and as C0deAttack commented I've got troubles with the button on the main2. What I've done is to set View.VISIBLE and View.GONE to the TextViews and Buttons that I wanted in each layout. Thank you very much.