Develop Reference

Android - Wrap buttons within view

I am trying to make buttons wrap in a LinearLayout in Android, but they are just continuing off to the right of the view (the word shown in the screenshot should be "HELLO", so I want the "O" to drop down to the next line).
I am adding the buttons programmatically, but even if I code them into the XML layout file, they still don't wrap. Here is the layout file with the LinearLayout container into which I am dynamically adding the buttons:
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constrainedWidth="true"
tools:context=".LetterTileView">
<LinearLayout
android:id="#+id/TilesContainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constrainedWidth="true"
android:orientation="horizontal">
</LinearLayout>
And here is the code I am using to create and add the tile buttons:
Context context = this;
LinearLayout layout = (LinearLayout) findViewById(R.id.TilesContainer);
LayoutParams params = new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT );
params.setMargins(50, 50, 0, 0);
for (int i=0;i<wordLength;i++) {
Button tileButton = new Button(this);
tileButton.setLayoutParams(params);
tileButton.setText(wordStringtoLetters[i]);
tileButton.setId(i);
tileButton.setBackgroundResource(R.drawable.tile_button);
tileButton.setTextSize(TypedValue.COMPLEX_UNIT_SP, 36);
layout.addView(tileButton);
}
Any advice would be appreciated. Thanks!

I ended up using FlexboxLayout, which works great for this. Thanks to those who offered suggestions!

First of all, there is no need to use a ConstraintLayout you can use your LinearLayout as the parent layout.
Then for the purpose of displaying all buttons in one line, you have to set weight for the LinearLayout in XML and set weight for the views you add to it.
The xml file should look like:
<LinearLayout
android:id="#+id/TilesContainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:weightSum="5"
app:layout_constrainedWidth="true"
android:orientation="horizontal">
</LinearLayout>
And in code you should set weight for each view you by adding ,1.0f to LayoutParam :
Context context = this;
LinearLayout layout = (LinearLayout) findViewById(R.id.TilesContainer);
LayoutParams params = new LayoutParams( LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT,1.0f );
params.setMargins(50, 50, 0, 0);
for (int i=0;i<wordLength;i++) {
Button tileButton = new Button(this);
tileButton.setLayoutParams(params);
tileButton.setText(wordStringtoLetters[i]);
tileButton.setId(i);
tileButton.setBackgroundResource(R.drawable.tile_button);
tileButton.setTextSize(TypedValue.COMPLEX_UNIT_SP, 36);
layout.addView(tileButton);
}

How to set Linear Layout Margin Programmatically (Xamarin)

I have a linear layout in my layout xml:
<LinearLayout
android:id="#+id/loginForm_LinearLayout" `
android:orientation="vertical"
android:layout_width="220dp"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true">
...some item...
</LinearLayout> `
But when program run, i have to change Margin top of this Linear Layout. How can do that in xamarin?

Try this
LinearLayout.LayoutParams ll = new LinearLayout.LayoutParams (ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.FillParent);
ll.SetMargins (0,0,0,10);
mainPanel.LayoutParameters = ll
OR
var mainPanel = FindViewById<LinearLayout>(Resource.Id.mainasdf);
var linearLayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FillParent,
ViewGroup.LayoutParams.FillParent);
linearLayoutParams.SetMargins(0, 0, 0, 0);
mainPanel.LayoutParameters = linearLayoutParams

Linear layout not using all lines

I want to build an app that will generate several textview which will all fit in the designated layout.
but once the line is full instead of continue in new line it not show the rest of the textviews
my MainActivity.java:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<String> urls=new ArrayList<String>(); //to read each line
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.sell);
// Add textview 1
for (int i=0;i<10;i++){
LinearLayout.LayoutParams layoutParams1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams1.setMargins(10, 10, 10, 10);
TextView textView1 = new TextView(this);
textView1.setLayoutParams(layoutParams1);
textView1.setText("TextView1\n2");
textView1.setBackgroundColor(0xFF3EB427); // hex color 0xAARRGGBB
textView1.setPadding(10, 10, 10, 10);// in pixels (left, top, right, bottom)
linearLayout.addView(textView1);
}
LinearLayout linearLayout2 = (LinearLayout) findViewById(R.id.buy);
LinearLayout.LayoutParams layoutParams2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
for (int i=0;i<2;i++){
layoutParams2.setMargins(10, 10, 10, 10);
TextView textView1 = new TextView(this);
textView1.setLayoutParams(layoutParams2);
textView1.setText("TextView2");
textView1.setBackgroundColor(0xFFB60612); // hex color 0xAARRGGBB
textView1.setPadding(20, 20, 20, 20);// in pixels (left, top, right, bottom)
linearLayout2.addView(textView1);
}
}
}
my xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:background="#ffffff"
android:layout_height="match_parent"
android:id="#+id/mymain"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.ohad.tradertracker.MainActivity"
android:weightSum="1">
<LinearLayout
android:id="#+id/stats"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="101dp">
</LinearLayout>
<LinearLayout
android:id="#+id/sell"
android:layout_weight=".5"
android:fillViewport="true"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
</LinearLayout>
and it looks like :
How can i generate unknown amount of textview and use all layout size???

I think there is a problem in your xml layout. Do it like this and tell me if it works.
You can do two things :
Just remove the weightSum from the main layout and do it like this and mention the layout_weight in your both linear layout.
Or you can mention the weightSum as 2 . and in both the layout ensure that you have mentioned the layout_weight as 1.

The content of a LinearLayout isn't visible

I tried to add some GUI elements like an ImageView or a TextView to a LinearLayout programmatically. But the elements aren't displayed.
To see if a element is drawn or not, I set a different background color for each element. The result was that I can only see the background color of the LinearLayout. But why?
public class MyLinearLayout extends LinearLayout {
public MyLinearLayout(Context context) {
super(context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
setLayoutParams(params);
setBackgroundColor(Color.RED);
imageView = new ImageView(context);
params = new LinearLayout.LayoutParams(100, 100);
imageView.setLayoutParams(params);
imageView.setBackgroundColor(Color.BLUE);
addView(imageView);
}
}
The strange thing is that I can see the red background color of the LinearLayout but in the size of the ImageView. If I add some other GUI elements like a TextView, I can see how the LinearLayout grows. But I can not see the TextView.
I'm really confused, because this not the first time I do something like this. Can u tell me what I'm doing wrong?
This is a snippet of the layout.xml file:
<LinearLayout android:layout_width="match_parent"
android:layout_height="45dp"
android:id="#+id/bottom_bar"
android:layout_alignParentBottom="true"
android:gravity="bottom">
<FrameLayout android:id="#+id/block_edit_delete_layout"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:background="#drawable/block_edit_delete_selector">
<ImageView android:layout_height="match_parent"
android:layout_width="wrap_content"
android:src="#drawable/block_edit_delete"
android:scaleType="fitXY"
android:contentDescription="#string/delete"/>
</FrameLayout>
<LinearLayout
android:id="#+id/block_edit_progress"
android:layout_height="match_parent"
android:layout_width="0dp"
android:layout_weight="1"
android:gravity="center"
android:orientation="horizontal"/>
<FrameLayout android:id="#+id/block_edit_random_layout"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:background="#drawable/block_edit_delete_selector">
<ImageView android:layout_height="match_parent"
android:layout_width="wrap_content"
android:src="#drawable/block_edit_random"
android:scaleType="fitXY"
android:contentDescription="#string/random_numbers"/>
</FrameLayout>
</LinearLayout>
The LinearLayout with the ID block_edit_progress is the container layout of multiple instances of the class MyLinearLayout. The instances are added in the code:
for(int i = 0; i < numberOfMyLinearLayouts; i++) {
MyLinearLayout v = new MyLinearLayout(getContext());
addView(v);
}
I hope this helps.

If i convert your code to xml, it would be something like:
<LinearLayout layout_width=wrap_content, layout_height = wrap_content>
<LinearLayout id= MyLinearLayout>//just an idea, syntax may be wrong
<LinearLayout layout_width= 100, layout_width=100>
<ImageView color=BLUE>
</ImageView>
</LinearLayout>
</LinearLayout>
</LinearLayout>
Whenever you call setLayoutParams on a View, parameter params you give should be parent element.
Try something like if you want linearlayout to be the parent of your linearlayout, use MATCH_PARENT for width, height if you want your view to span the width, height of view's parent
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
setLayoutParams(lp);//lp is parent view
Also try this, just in case views are getting added to right of your views, and you are not able to see them on screen
yourview.setOrientation(LinearLayout.VERTICAL);

Change the width and height of linear layout to match_parent and see how it changes. wrap_content will only show the content of the linear layout, which seems to be your problem.

I solved the problem. (Or found a workaround)
I moved the complete initialization stuff out of the constructor of the MyLinearLayout. If I then adding a View after the layout has been completely generated, everything works.
Like this:
MyLinearLayout ll = new MyLinearLayout(getContext());
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(100, 100);
ll.setLayoutParams(params);
ll.setBackgroundColor(Color.RED);
ImageView v = new ImageView(getContext());
params = new LinearLayout.LayoutParams(50, 50);
v.setLayoutParams(params);
v.setBackgroundColor(Color.GREEN);
ll.addView(v);
addView(ll);
I don't know why the other way doesn't work. Thanks for the fast answers!

Android set dynamically elements in RelativeLayout

Hi I got a problem with the RelativeLayout. The idea is to define a title bar in the XML code on top of the screen and then add a textview element BELOW this bar on the left side but when I add this TextView in the java code it is always displayed in the top left corner of the display (means it is set over the title bar). Anyone know what I'm doing wrong?
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/main">
<Button
android:id="#+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</RelativeLayout>
</ScrollView>
RelativeLayout rl = (RelativeLayout) this.findViewById(R.id.main);
for (int i=0; i<=5; i++) {
TextView tv = new TextView(this);
tv.setId(i);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT );
if (i == 0)
params.addRule(RelativeLayout.BELOW, R.id.title);
else
params.addRule(RelativeLayout.BELOW, i-1);
rl.addView(tv, params);
}

I think you have to add an ID to the textview as well, even though you won't have to reference it. Also you can addView and set parameters in one call:
tv.setId(123);
params.addRule(RelativeLayout.BELOW, R.id.title);
rl.addView(tv, params);