Develop Reference

Android Studio - issue with manipulating Layouts/Views programmatically

I have a few issues with setting LayoutParams and other parameters of my layouts/views programmatically. I cannot specify these in a XML layout file because whether they appear depends on the data held in the database.
The following is a function I use to create a new "Section" which consists of a FrameLayout with its children being View and TextView:
public FrameLayout createSection(long id, String name) {
FrameLayout frame = new FrameLayout(this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 100);
params.setMargins(15, 15, 15, 15);
frame.setLayoutParams(params);
View view = new View(this);
LayoutParams viewParams = new LayoutParams(LayoutParams.MATCH_PARENT, 100);
view.setLayoutParams(viewParams);
view.setId(toIntExact(id));
view.setBackgroundResource(R.color.colorButton);
frame.addView(view);
TextView text = new TextView(this);
LayoutParams textParams = new LayoutParams(LayoutParams.MATCH_PARENT, 100);
textParams.setMarginStart(15);
text.setGravity(Gravity.CENTER);
text.setTextAlignment(TextView.TEXT_ALIGNMENT_TEXT_START);
text.setTextColor(getResources().getColor(R.color.colorTextSecondary));
text.setText(name);
frame.addView(text);
return frame;
}
The parent of this newly created FrameLayout is LinearLayout and so based on the other similar questions on StackOverflow I figured setting parameters for FrameLayout should be done through LinearLayout.LayoutParams. However, this does not make a change. The initial XML page contains this:
Initial XML page
The first "SECTION" is created in the XML file, and the other two are created through 'createSection' function. This is the outcome: Design outcome
The issue is that the margins are not set properly and the TextView doesn't seem to care about the Gravity + TextAlignment combination that I'm using.
I would appreciate any help that I could get to resolve this issue.

I apologise for wasting anyone's time. The code seems to work and the margin sizes are different due to these being set in terms of pixels (px) rather than dp as it is in the XML file.
I also forgot to add text.setLayoutParams(textParams); to the TextView object.

How to change the position of edit text programmatically in android?

I'm creating a number of edit texts next to each other programmatically using RelativeLayout. The default width of each edit text is wrap_content, but when the edit text reaches the edge of the screen, it visually changes it's sizes. So how can I make it move to the next line when this happens?
private EditText createEditText(EditText editText1, EditText editText2, String word){
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
editText.getLayoutParams().width,
editText.getLayoutParams().height
);
layoutParams.addRule(RelativeLayout.RIGHT_OF, editText1.getId());
layoutParams.addRule(RelativeLayout.BELOW, textView.getId());
layoutParams.leftMargin += 60;
editText2.setHint("" + word);
editText2.setHintTextColor(editText.getSolidColor());
editText2.setBackgroundResource(R.drawable.rounded_edittext);
editText2.setLayoutParams(layoutParams);
editText2.setPadding(editText.getPaddingLeft(), editText.getPaddingTop(), editText.getPaddingRight(), editText.getPaddingBottom());
editText2.setId(View.generateViewId());
relativeLayout.addView(editText2);
return editText2;
}

Try FlowLayout in android and dynamiaclly inflate TextViews in it.
Rather than that you can use Linearlayout with fixed number of children in each row and if doing this the children must having same layout_weight.
But rather than going in such big disputes i will request you to simply replace RelativeLayout With FlowLayout in android

What you can try. Not sure, if it will work.
what you can do is calculate the width of screen on onCreate and make a check if the view exceeds that, make a new relative below the last one.
To be honest linear layout will be more easier to maintain using weight property.

Hindi kavita proper alignment/justification

I am developing an app related to hindi kavita(poems). I want the poems to be displayed in the way real poems are displayed like the image shown below
Now the problem is I dont know how to use a textview to show this kind of text

Use a linear layout with vertical orientation. Add a text view for each line, with layout_width="match_parent" and the appropriate gravity attribute.
https://developer.android.com/reference/android/widget/LinearLayout.html
EDIT:
If you have your poem as an arraylist of strings where each element is a line of your poem, you can do:
//Initialise your layout in your activity onCreate()
LinearLayout layout = (LinearLayout) findViewById(R.id.linear_layout);
layout.setOrientation(LinearLayout.VERTICAL);
//Start listening to your firebase data and put this somewhere in the callback:
// poemLines is a list of Strings you get from firebase
for(i=0; i<poemLines.size(); i++){
TextView view = new TextView(context);
view.setText(poemLines.get(i));
//set any other attributes to your textview that you want, width, height, font, etc
view.setGravity(i%2==0?END:START);
layout.add(view);
}

Android - textviews are not visible when dynamically created

I am trying to make an app that lets the user store and saves contacts. It can save, but it has problems listing.
I have a for loop that runs through the database and prints a set of data for each contact (each row), an image (actually its a string because it passes the path) and a string. It prints them in a scrollview with a linear layout for each contact (each contact has a linear layout of its own, so that i can let one contact occupy a row each). The images come out, however, the textviews are nowhere to be found.
Using log.d(textview.getText()); it confirms that the textviews are created and take up space.
http://chesnutcase.heliohost.org/derpbox/itv1.png
Two "contacts" with names, not printed out. The space inbetween is presumbly by the textview.
http://chesnutcase.heliohost.org/derpbox/itv2.png
Another two "contacts", but without names. The dont have a space between each other. Or at least, a significantly smaller space.
Code:
DatabaseHandler db = new DatabaseHandler(this);
int a = (int) (long) db.countRows();
LinearLayout theLayout = (LinearLayout)findViewById(R.id.contactsList);
for(int i = 0;i<a;i++){
ImageButton image = new ImageButton(this);
int density=getResources().getDisplayMetrics().densityDpi;
LinearLayout.LayoutParams vp = new LinearLayout.LayoutParams(density,density, 0.5f);
image.setLayoutParams(vp);
image.setScaleType(ImageView.ScaleType.FIT_END);
int b = a - i;
try {
image.setImageBitmap(decodeUri(Uri.parse(db.getContactData("photo_path")[i])));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
theLayout.addView(image);
TextView tv = new TextView(this);
tv.setText(db.getContactData("name")[i]);
Log.d("UserLog","name is " + db.getContactData("name")[i]);
Log.d("UserLog","textfield contains " + tv.getText());
LinearLayout.LayoutParams vp2 = new LinearLayout.LayoutParams(0,0,1f);
tv.setLayoutParams(vp2);
tv.setBackgroundColor(Color.RED);
theLayout.addView(tv);
}
Any solutions? Thanks in advance

Double check which orientation you've applied to the LinearLayout of your contacts list.
You are setting bad LayoutParams to your TextView. You're making your TextView 0px by 0px with a weight of 1.
LinearLayout.LayoutParams vp2 = new LinearLayout.LayoutParams(0,0,1f);
tv.setLayoutParams(vp2);
Try using one of the MATCH_PARENT or WRAP_CONTENT constants. They're listed here: http://developer.android.com/reference/android/view/ViewGroup.LayoutParams.html#MATCH_PARENT
If you want your TextView to take up the remaining width of the screen I would leave the weight as 1, the width as 0, but you need to set the height to a constant like WRAP_CONTENT.
You're also setting the size of your ImageView to the device screen density (which is a constant) instead of setting a scaling size based off your screen density.

You probably need to call requestLayout(); in order to update the current view layout.
theLayout.requestLayout();
Also it seems you are creating a view with 0 width and 0 height with that layout params:
LinearLayout.LayoutParams vp2 = new LinearLayout.LayoutParams(0,0,1f);

It is better to use ListView for such list.
You will need to write only one Adapter, that's represent logic for creating one row on list.

I would recommend using a CursorAdapter and a layout xml file, this way you can design it to look exactly how you want, and preview it. It is a lot easier than setting all those fiddly LayoutParams
If you have to create them dynamically you may find the text colour is the same as the background, try setting it to something visible like bright red for testing. If you still don't see the text it may be that it's visibility isn't set to View.VISIBLE finally the layout may not be the correct size, a handy tip for this is set the background to a suitably eye catching colour, even if there is no text you should see a shaded block.

Setting up RelativeLayout in java code

I'm having a hard time getting two text views to appear on top of each other in my java code. Here's the code I'm experimenting with:
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
layout = new RelativeLayout(this);
text1 = new TextView(this);
text1.setText("1");
text2 = new TextView(this);
text2.setText("2");
RelativeLayout.LayoutParams p = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
RelativeLayout.LayoutParams q = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
q.addRule(RelativeLayout.BELOW, layout.getId());
text1.setLayoutParams(q);
layout.addView(text1);
p.addRule(RelativeLayout.BELOW,text1.getId());
text2.setLayoutParams(p);
layout.addView(text2);
setContentView(layout);
}
This stacks the two text views on the same line, but I want TextView text2, to appear below TextView text1, so in my app I want the following to appear as the output:
1
2
I've tried all sort of things with the "addRule" method, I'm not sure why this isn't working. I want to know how to do this without XML because I plan to build a library of methods that can build up a layout that is easily adjustable through editing an array.

Your TextViews don't have an id (by default the id is -1)... put this after their initialization:
text1.setId(1111); // 1111 is just an example,
text2.setId(2222); // just make sure the id are unique

I don't think you are looking to layout the text1 view below the RelativeLayout since you added all your views to it as children, right? Try removing the first rule; that rule is asking the text view to be below the same view it is in.
EDIT: Also a help is explicitly setting the id of the view you are laying out relative to.
So here:
text1.setId(2);
p.addRule(RelativeLayout.BELOW,2);

you can use xml layout for this :
in relative layout
u set the first textview and assign it some id
fot the next text view we can assign parameter
android:layout_below="id of above text view"
in this way we get 2nd text view below 1st text view