I have a custom Relative Layout and added a button to it
RelativeLayout rel_layout = new RelativeLayout(mcontext);
RelativeLayout.LayoutParams rel_param = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT);
rel.setLayoutParams(rel_param);
Button b = new Button(mcontext);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
b.setLayoutParams(params);
b.setText("Test");
rel_layout.addView(b);
Now, I want this Relative layout to be added to a View. My View Class looks like this is
public class CustomView extends View {
Context mcontext;
public CustomView(Context context) {
super(context);
this.mcontext = context;
}
}
and in the Main Activity I am calling this view in my setConentView()
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new CustomView(this));
}
}
So now on the Screen I should have the relative layout with the button in it. I should not use any XMl's.
I need help in how to add the dynamic relative created to be added to my CustomView class
Hope I have explained my problem clearly.
// try this
custom_view.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/relCustomView"
android:background="#android:color/darker_gray"
android:padding="5dp">
</RelativeLayout>
public class CustomView extends View{
private Context context;
public CustomView(Context context) {
super(context);
this.context=context;
}
public View getCustomView(){
View v = LayoutInflater.from(context).inflate(R.layout.custom_view,null,false);
RelativeLayout relCustomView = (RelativeLayout) v.findViewById(R.id.relCustomView);
Button b = new Button(context);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
b.setLayoutParams(params);
b.setText("Test");
relCustomView.addView(b);
return v;
}
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new CustomView(this).getCustomView());
}
You are not supposed to do that. RelativeLayout is a ViewGroup. ViewGroup is a View that can hold one or more Views as children. You should implement your own ViewGroup instead of View.
You can find a tutorial for implementing custom ViewGroup here:
https://developer.android.com/reference/android/view/ViewGroup.html
Also, I'd like to suggest that you might actually want to place RelativeLayout directly on your Activity and place some customized widgets on top of it along with the button you mentioned.
Your custom view has to extend a ViewGroup, not a View.
Related
I have a class that extend activity and that get its view in this way:
setContentView((View) viewClass);
viewClass is class that extends from view.
I need to implement some button and image view in this class. but how?
You need to extends your custom view from ViewGroup or kind of layout for example LinearLayout, this will help you to adding another views to your layout programmatically from activity like :
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout view = new LinearLayout(this);
setContentView(view);
TextView tv = new TextView(this);
tv.setText("asas");
view.addView(tv);
}
}
You can do something like below
let your main activity be as below
public class MainActivity extends Activity{
MyView view;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Context ctx = getApplicationContext();
view=new MyView(ctx);
setContentView(view);
}
}
and let your view class extend any container layout.
public class MyView extends RelativeLayout{
public MyView(Context context) {
super(context);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
this.setLayoutParams(layoutParams);
RelativeLayout.LayoutParams params1 = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
TextView tv = new TextView(context);
tv.setText("hello");
tv.setId(1);
Button b = new Button(context);
params1.addRule(RelativeLayout.BELOW, tv.getId());
b.setText("Hi");
b.setId(2);
this.addView(tv);
this.addView(b, params1);
}
}
I have a custom view extending RelativeLayout (could be any other viewgroup). In this view I have several framelayouts added with addView(). No XML exists for this view! The view constructer adds everything from code.
I want to use this custom view as any other content view for an activity.
I have this fragment activity:
MyView myview;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myview = new MyView(this);
myview.getSomeContainedFrameLayoutOfView().setId(12345);
setContentView(myview);
}
Then I do this in onResume
#Override
protected void onResume() {
super.onResume();
View u = findViewById(12345); // test, returns null
u = myview.findViewById(12345); // test, also null
SomeFragment f = new SomeFragment();
FragmentManager m = getSupportFragmentManager();
FragmentTransaction ft = m.beginTransaction();
ft.replace(12345, f); // ofcourse error (no view found for id)
ft.commit();
}
Why is findViewById null? If I change setContentView() line to
setContentView(R.layout.myframelayouts);
Everything works. So somehow I suspect
setId(12345)
does something different from:
android:id="#+id/someid"
What am I missing?
Is the view returned by getSomeContainedFrameLayoutOfView() actually contained in the RelativeLayout? That is, somewhere in MyView have you called AddView(theTargetView)?
If the target view is simply a member of MyView, then the RelativeLayout, which implements findViewById unless you override it, doesn't know about the target view.
I have something like this:
public class MojLayout extends LinearLayout {
private FrameLayout lijeviFrame;
private FrameLayout glavniFrame;
private int layoutWidth;
private int panel;
private boolean glavniFrameFullScreen = false;
public MojLayout(final Context context, final float leftWeight) {
super(context);
lijeviFrame = new FrameLayout(context);
glavniFrame = new FrameLayout(context);
post(new Runnable() {
#Override
public void run() {
layoutWidth = getWidth();
panel = (int) (layoutWidth / leftWeight);
init(context);
}
});
}
private void init(Context context) {
lijeviFrame.setId(R.id.lijeviFrame); //defined in /res/values/ids.xml
glavniFrame.setId(R.id.glavniFrame);
LinearLayout container = new LinearLayout(context);
container.setOrientation(HORIZONTAL);
....
container.addView(lijeviFrame);
container.addView(glavniFrame);
addView(container);
}
In onCreate() method I tried myView.findViewbyId(R.id.lijeviFrame) -> null, without myView, same.
I don't get it
I already have an XML layout with some buttons in it, and now i want to add a textview to the same layout, but in my Java class. I don't get any errors until the "addView" line. I would also appreciate it if someone could tell me a better way to add onto a pre-existing XML layout in Java.
public class MyActivity extends Activity{
TextView textview;
RelativeLayout layout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
layout=(RelativeLayout)findViewById(R.id.mylayout);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParam(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);
textview=new TextView(this);
textview.setId(16);
textview.setText("Help");
layout.addView(textview, params);
setContentView(layout);
}
Your code should be like this, since you already have xml layout, you should first setContent to xml layout and then add new view to the Relativelayout.
public class MyActivity extends Activity{
TextView textview;
RelativeLayout layout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.file_name);
layout=(RelativeLayout)findViewById(R.id.mylayout);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParam(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, RelativeLayout.TRUE);
textview=new TextView(this);
textview.setId(16);
textview.setText("Help");
layout.addView(textview, params);
}
I have the following class
public class GameActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View gameView = new GameView(this);
setContentView(gameView);
}
}
and now I'd like to add a Button to my class GameView.
public GameView(Context context) {
super(context);
// Code ...
}
I need this button during my game, so it should be alywas in front of all the other canvas' I'm drawing. How can I do that?
Do you want to create a new button?
Button b = new Button(context);
b.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
gameView.addView(b);
Use ViewGroup as GameView parent insted of simple View
ViewGroup gameView = new GameView(this);
public class GameView extends ViewGroup { //...
View gameView = new GameView(this);
replace the above line by below line::
View gameView = new GameView(this).createView();
and now in the Game view createview with button and etc.
public class GameView extends View {
private Activity _activity;
public GameView (Activity _activity) {
super(_activity);
// TODO Auto-generated constructor stub
this._activity = _activity;
}
public View createView(){
LinearLayout l = new LinearLayout(_activity);
l.setOrientation(LinearLayout.VERTICAL);
Button btn = new Button(_activity);
btn.setId(1);
btn.setText("btn"+(i+1));
l.addView(btn);
return l;
}
}
try this working code:::
I am trying to add Views to a custom ViewGroup. The ViewGroup gets drawn, but no Views that were added to it are visible. LineView's (which extends a View) onDraw() method does not get called. What am I doing wrong?
public class TestActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ShapeView shapeView = new ShapeView(this);
shapeView.setBackgroundColor(Color.RED);
drawContainer = (RelativeLayout)findViewById(R.id.draw_container);
drawContainer.addView(shapeView);
}
}
public class ShapeView extends ViewGroup {
private LineView mLineView;
public ShapeView (Context context) {
super(context);
RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(200, 200);
this.setLayoutParams(p);
mLineView = new LineView(context);
this.addView(mLineView);
}
}
I maybe wrong but should you not be adding the shapeView to your layout "main"? What is drawContainer? I can't see it being instantiated and not in the docs. I assume main contains a relative/linear layout.
Access it by:
RelativeLayout rel = (RelativeLayout) findViewById(R.id.container);
(where the id is changed to match your id)
then:
rel.addView(shapeView);