I have a LinearLayout that contains a TextView, and always will. There will also always be at least one button located below the TextView, but there might be more than one under certain circumstances.
I can successfully create and add as many buttons as I need programmatically. I can also successfully set whatever appearance related parameters/options that I require for these buttons programmatically.
The problem is that I don't know how to tell a programmatically created button that it should use a XML resource file, which contains the appearance and layout parameters, instead of setting these parameters programmatically.
I've looked at similarly named questions and spent time messing with the API itself, to no avail.
Edit:
Here's an approximation of what I'm trying to do that will hopefully make explanations a bit clearer for me:
private TextView textView;
private SomeObject someObject;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View scrollView = inflater.inflate(R.layout.fragment_play_game, container, false);
textView = (TextView) scrollView.findViewById(R.id.game_data_text);
textView.setText(someObject.getTextForTextView());
LinearLayout layout = (LinearLayout) scrollView.findViewById(R.id.game_data_container);
for (String optionText : someObject.getTextForButtons()) {
layout.addView(createOptionButton(optionText, layout));
}
return scrollView;
}
private View createOptionButton(String optionText, LinearLayout layout) {
Button optionButton = new Button(this.getActivity());
// set button layout/options here, somehow??
optionButton.setText(optionText);
return optionButton;
}
My XML layout file for the fragment looks like this (It's this LinearLayout that I'm trying to add buttons to):
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/game_data_container"
etc... >
<TextView
android:id="#+id/game_data_text"
etc... />
</LinearLayout>
</ScrollView>
Also, if I'm to create an XML layout file for the button (lets call it custom_button.xml) should it look something like this?:
<?xml version="1.0" encoding="utf-8"?>
<Button xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/play_game_option_button"
etc... />
Update:
Just to expand a bit on what MrFox# is talking about, what I did to get it working was replace this line:
Button optionButton = new Button(this.getActivity());
with this one:
Button optionButton = (Button) inflater.inflate(R.layout.play_game_option_button, layout, false);
...which inflates an xml file containing only a Button layout (the button template). In this case, it returns the root view of that file, which is just the button because there's no parent above the button in the file.
However, if I had have set the last boolean value (attachToParent) to true, it would have returned the root container that the button will be in (which is just the 'layout' variable that was passed into the call).
I can now produce as many buttons as I want using this template.
Have you thought of making a layout that is just the button with the applied XML styles and then inflating it into your linear layout?
something like:
inflater.inflate(R.layout.StyledButton, MyLinearLayout, true);
xml for your button under /res/layout/my_button_layout.xml
<Button xmlns:android="http://schemas.android.com/apk/res/android"
... />
code in your activity
myButton = (Button)inflate.inflate(R.layout.my_button_layout, null);
myView.addView(myButton);
Related
I want to know, there is a linearlayout and use that with setContentView function. Also there is a spinner inside of linearlayout. What I want to do is, create a new layout inside of /res/layout folder and add it into layout that I set with setContentView.
Is there anyway or I need to do that programmatically?
EDIT:
I think I couldn't tell.
I have 2 two layouts(ready). I use the first layout with setContentView.For example, there is a buton and if user click that button, I want to add second layout bottom of first layout when application running.
Easiest you do that with include in the xml of your main layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<include layout="#layout/second" />
</LinearLayout>
It´s also possible to do it programmatically, but this way I think it is more clear.
Edit:
To do this programmatically, put this code in listener of the first button.
RelativeLayout view = (RelativeLayout) findViewById(R.id.RelativeLayout1);
Button b = new Button(getApplicationContext());
b.setText("Click me too!");
view.addView(b);
Instead of creating a button (or whatever you want) you can also inflate a premade layout.
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.second, null);
view.addView(v);
I don't think you can change the res folder programmatically. You need to add any layout programmatically only.
Edited:
Get the 2nd layout's instance using findViewById and use setVisibility method to control the layout's visibility.
I have an XML layout having a single TextView
Now I want to add 50 buttons which I want to add dynamically in my java file !.
Is it possible to add attributes to an XML file via java code ??
Or can an activity have 2 layouts at a time ??
for eg,
public class Options extends Activity
{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.options);
Button but=new Button(this);
but.setText("Wassup");
// How do I add this button to the layout ?
}
}
Is it possible to add attributes to an XML file via java code ??
No, but you can add properties to Views and Layouts as you are doing with setText(). resource files themselves cannot be changed after compiled.
Or can an activity have 2 layouts at a time ??
The simple answer is no but you can inflate another layout and add it to the current layout.
Example of what you can do to add a Button
Inflate your root layout and add the Buttons to it with addView(). Something like
Layoutinflater inflater = (LayoutInflater) getSystemService
(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout ll = (LinearLayout) inflater.inflate(R.layout.layout_file);
Button but=new Button(this);
but.setText("Wassup");
// How do I add this button to the layout ?
ll.addView(but);
LayoutInflater
Or if you want to add it to a layout in the current file you can just use findViewById() and use addView() on that to add your Buttons to.
Considering you have an xml layout as below:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#id/mainlayout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</TextView>
</LinearLayout>
In your java code after setContentView(R.layout.options); you can do the following:
LinearLayout linearLayout=(LinearLayout)findViewById(R.id.mainlayout);
Button button=new Button(this);
linearLayout.addView(button);
Now you can add as many buttons you like into the linear layout as seen above.
Yes it is possible. After setContentView(R.layout.options); get your buttons container with findViewById(). You will have a reference to a LinearLayout, RelativeLayout or something else. After that use Layout inflater and programmatically you can add other layouts or components.
Hope it helps!
just use layout.addView() where layout is a ViewGroup that you get by calling findViewById(R.id.layoutId)
I have a problem button visibility. I have 2 button from titlebar.One of them edit, one of them done. First I want to see just edit button and when i clicked edit button, edit button visibility will be false and done button visibility true.
I get their id from xml and when i click one of them i want to change visibility but edit.setVisibility(); it doesnt work.What is wrong?I can see edit button.I want to change buton visibility programmatically.
Can anybody have any idea?
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final boolean customTitle = requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.main);
edit=(Button)findViewById(R.id.edit);
done=(Button)findViewById(R.id.done);
edit.setVisibility(View.INVISIBLE);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.main);
if ( customTitle ) {
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.main);
}
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button android:id="#+id/edit"
android:layout_width="57px"
android:layout_height="wrap_content"
android:text="edit"/>
<Button android:id="#+id/done"
android:layout_width="57px"
android:layout_height="wrap_content"
android:text="done"/>
</LinearLayout>
First, you're missing the android:orientation parameter in your LinearLayout.
Second, if you want to change between edit and done you can do this:
edit.setVisibility(View.GONE);
done.setVisibiluty(View.VISIBLE);
and the opposite to change to edit button again.. With View.INVISIBLE the button will not show but still use the space where it was.
The problem is that setFeatureInt just sets the resource ID for the title, which will cause a new inflation of the layout resource, which will be placed in a system FrameLayout called id/title_container. This can be inspected using the Hierarchy Viewer in eclipse.
Essentially, you end up with two instances of the main layout. One set as the content view (below the title) and the other set as the title. When you call findViewById, it will only look in the content view for any views matching the ID. This means that the edit and done buttons you retrieve are the ones in the content view.
If you want to access the buttons in the title area, you can use
View v = getWindow().getDecorView();
edit=(Button)v.findViewById(R.id.edit);
done=(Button)v.findViewById(R.id.done);
edit.setVisibility(View.INVISIBLE);
This will search through the whole view structure of the window, not just the content view, thus solving your problem.
I have a program where I want to add two views in one activity, like
public class AnimationActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new GraphicsViewForBitmap(this));
setContentView(new GraphicsView(this));
}
}
where GraphicsViewForBitmap & GraphicsView are two classes extends view.
so I want at a time two views should set to an activity.
Is it possible?
Plz give me answer.
Thanks
setContentView() will display only the view that you have set . If you want to display more than one view then you can add both the view in your layout XML file inside any Layout like LinearLayout,RelativeLayout etc. Then you can use setContentView(R.layout.yourXML).
Here is how you can do it in your XML...
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.yourpkg.GraphicsView
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
<com.yourpkg.GraphicsViewForBitmap
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
Yes but first you have to put them inside a ViewGroup, for example a LinearLayout, and then set that ViewGroup with setContentView. Because with the existing code you're not just appending the second view with the first, but you are setting another content.
Add the second view to the first view.
LinearLayout childLayout = new LinearLayout(this);
childLayout.setOrientation(LinearLayout.HORIZONTAL);
childLayout.addView(graphicsView);
parentLayout.add(childLayout);
Another way is to create a 2nd layout XML, say main2.xml (the 1st being main.xml). Then you can swap from one to another via, e.g. an ActionBar button, etc. as follows:
setContentView(R.layout.main2); // Pass from layout #1 to layout #2
setContentView(R.layout.main); // Pass from layout #2 back to layout #1
(You can create as many views as you like ...)
My issue is that I have a main screen, and I would like to dynamically spawn a view under it with a button click, then slide the main view off the screen revealing the view below it. I've accomplished this, but I feel like there's got to be a better way. The way I've done it is very limited in that you can't just spawn views over and over again under the main.
My main XML file looks like this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<RelativeLayout
android:id="#+id/subpage"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
</RelativeLayout>
<RelativeLayout
android:id="#+id/homescreen"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/homebg"
>
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
I've deleted some unnecessary stuff. This is what's important. Notice the first child of the main layout is a relative layout with the id "subpage." As it is I use java to inflate another layout into the subpage layout when a button is clicked then I animate the "homescreen" layout off the screen. It seems like I shouldn't have to have the subpage declared in advance though. I guess my question is, is there a way to dynamically declare a new child layout underneath an existing layout?
=======================================================================
Edit: Part 2 of question
I'm trying to use addView and the app crashes. This is the code I use to try to add a view and inflate my xml into it. In the code below subview is a ViewGroup because as I understand it you can only inflate into ViewGroups, not regular views. Also 'activity' is defined at the top of the class as 'private Activity activity = this'. Any ideas what could be causing the crash?
btnHelp.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
subView = (ViewGroup)new View(getApplicationContext());
mainScreen.addView(subView,1);
LayoutInflater inflater = activity.getLayoutInflater();
inflater.inflate(R.layout.help, subView);
}
});
=======================================================================
Edit: Part 3 of question
So one more issue. Everything works great as far as inflating and sliding off. However, the view that is inflated has a button in it. I'm trying to assign a listener to that button, but it doesn't seem to work. I'm doing it by adding the listener to the button after the layout inflater is called in the btnHelp I've been working on. Here's the code:
btnHelp.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
LayoutInflater inflater = activity.getLayoutInflater();
mainScreen.addView(inflater.inflate(R.layout.help, null),0);
homeScrn.startAnimation(slideLeftOut);
btnBackHome = (ImageView)findViewById(R.id.backMenuBtn);
btnBackHome.setOnClickListener(goHome);
}
});
goHome is a handler I've defined below this as such:
private OnClickListener goHome = new OnClickListener(){
public void onClick(View v) {
Log.d("ClickEvent: ","btnBackHome Clicked");
homeScrn.startAnimation(slideRightIn);
}
};
When I click the button referenced by btnBackHome it doesn't do anything. I'm just not sure if it's because the listener isn't actually being assigned, something is keeping the button from actually being clicked, or something else.
Call addView() on the RelativeLayout to add children to it, where the children are either inflated (getLayoutInflater().inflate()) or constructed directly in Java.
Also, you might consider using a ViewFlipper, considering that it does what you're seeking (animated transition from child to child, with only one child visible at a time in the steady state), perhaps with less code.
The default animation when starting a new Activity is a sliding animation.. why not just separate your "homescreen" and "subpage" into 2 different XML files and 2 Activities?