Develop Reference

How I can use java code for creating design on android

I am trying to put TextView into FrameLayout into Linear layout.
When I do it using XML it's OK, but using Java code there are problems.
So I can't move text view using layout_gravity in Java code. Also, I don't understand why text matching parent when I use a parameter wrap content. must be
XML code
<LinearLayout
android:id="#+id/chatBox"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_gravity="right"/>
</FrameLayout>
Java code
FrameLayout fl = new FrameLayout(this);
fl.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.MATCH_PARENT));
TextView tv = new TextView(this);
tv.setText(message);
LinearLayout.LayoutParams p = new
LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
p.gravity = Gravity.LEFT; tv.setLayoutParams(p);
fl.addView(tv);
LinearLayout chatbox = (LinearLayout) findViewById(R.id.chatBox);
chatbox.addView(fl, 0);

you are adding TextView tv to FrameLayout, so you should use FrameLayout.LayoutParams for this TextView
FrameLayout.LayoutParams p = new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT);
p.gravity = Gravity.LEFT;
tv.setLayoutParams(p);
fl.addView(tv);

You need to LayoutParams for your Textview not Linearlayout Params. That is causing the problem. You can create it like;
tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT))

How to Left Align TableRow objects?

They currently appear on the center.
Android Java Code
public void populateTable() {
for(DoctorBean post: beanPostArrayList){
String result = "";
TableRow row = new TableRow(getActivity());
row.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
ImageView docImageView = new ImageView(getActivity());
docImageView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
docImageView.setPadding(5, 5, 5, 5);
docImageView.setImageResource(R.drawable.ic_doctor);
TextView textView = new TextView(getActivity());
textView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
textView.setPadding(5, 5, 5, 5);
result += "\n" + post.getHeroName();
textView.setGravity(Gravity.LEFT);
docImageView.setForegroundGravity(Gravity.LEFT);
row.setGravity(Gravity.LEFT);
textView.setText(result);
row.addView(docImageView);
row.addView(textView);
tableLayout.addView(row);
}
}
Layout Code
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.gms.maps.MapView
android:id="#+id/mapView"
android:layout_width="match_parent"
android:layout_height="229dp"
class="com.google.android.gms.maps.SupportMapFragment" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TableLayout
android:id="#+id/tableLayout1"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:padding="10dp"
android:shrinkColumns="*"
android:stretchColumns="*">
</TableLayout>
</ScrollView></LinearLayout>
So there I want to align the ImageView and the TextView to the left.

An alternative approach should solve your issue
You don't need to add explicit scroll for a TableView
TableView can be directly added to your main LinearLayout. As you have already specified the height of MapView
Suggested Modified xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/mainLL"
android:orientation="vertical">
<com.google.android.gms.maps.MapView
android:id="#+id/mapView"
android:layout_width="match_parent"
android:layout_height="229dp"
class="com.google.android.gms.maps.SupportMapFragment" />
<TableLayout
android:id="#+id/tableLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</TableLayout>
</LinearLayout>
Corresponding code change
LinearLayout linearLayout=(LinearLayout)view.findViewById(R.id.mainLL);
//Table Layout parameters
TableRow.LayoutParams textViewParam = new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT,1.0f);
TableLayout tableLayout = (TableLayout) view.findViewById(R.id.tableLayout);
TableRow trHead = new TableRow(context);
LayoutParams tableRowParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
trHead.setLayoutParams(tableRowParams);
TextView nameHead = new TextView(context);
nameHead.setText("Content left");
nameHead.setLayoutParams(textViewParam);
nameHead.setGravity(Gravity.LEFT);//or Gravity.CENTER according to your requirement
trHead.addView(nameHead);
TextView detailHead = new TextView(context);
detailHead.setText("Content right");
detailHead.setGravity(Gravity.RIGHT);//or Gravity.CENTER according to your requirement
detailHead.setLayoutParams(textViewParam);
trHead.addView(detailHead);
tableLayout.addView(trHead);
//add table layout to linear layout
linearLayout.add(tableLayout);
NOTE:
Many values have been referred from resource files, You can either
neglect/replicate those. I have added two textviews. You may need to
change according to your requirement

Android Add Layout View to another Layout programatically

I have a LinearLayout with Vertical orientation and I would like to add another horizontal LinearLayout with two childs.
Here is my xml layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/Gray_background"
android:orientation="vertical" >
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="10dp"
android:background="#color/GrayStroke" />
<LinearLayout
android:id="#+id/contacts_tab_menulist"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/White"
android:orientation="vertical" >
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#color/GrayStroke" /> </LinearLayout>
Here is the code which should do the job:
View rootView = inflater.inflate(R.layout.contacts_tab,
container, false);
contacts_tab_menulist = (LinearLayout) getActivity().findViewById(R.id.contacts_tab_menulist);
// add LayoutParams
LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 35);
LinearLayout listItem = new LinearLayout(getActivity());
listItem.setLayoutParams(lparams);
listItem.setOrientation(LinearLayout.HORIZONTAL);
AspectRatioImageView icon = new AspectRatioImageView(getActivity());
LinearLayout.LayoutParams ic_params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 25);
icon.setImageResource(R.drawable.contacts_add_contact);
icon.setLayoutParams(ic_params);
listItem.addView(icon);
TextView title = new TextView(getActivity());
LinearLayout.LayoutParams t_params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
title.setText("Add Contact");
title.setId(0);
title.setLayoutParams(t_params);
listItem.addView(title);
contacts_tab_menulist.addView(listItem);
return rootView;
I get a nullPointerException on contacts_tab_menulist.addView(listItem). What am I doing wrong?

Try replacing
contacts_tab_menulist = (LinearLayout) getActivity().findViewById(R.id.contacts_tab_menulist);
with
contacts_tab_menulist = (LinearLayout) rootView.findViewById(R.id.contacts_tab_menulist);

Get the view from your inflated view, since inflating the View does not mean its the current activities view:
contacts_tab_menulist = (LinearLayout) rootView.findViewById(R.id.contacts_tab_menulist);

Textview layout center vertical and horizontal in ScrollView by programmatically

Application has scrollview in XML layout.
<ScrollView
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="5dp"
>
</ScrollView>
I want to one textView into this scrollView center.
I tried This code, set horizontal center, but vertical top.. I want both centered.
LinearLayout l1 = new LinearLayout(getActivity());
l1.setOrientation(LinearLayout.VERTICAL);
l1.setGravity(Gravity.CENTER);
l1.setBackgroundColor(Color.WHITE);
TextView errorView = new TextView(getActivity());
LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(
new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
errorView.setText("TextView");
errorView.setTextColor(Color.BLACK);
errorView.setLayoutParams(params);
errorView.setGravity(Gravity.CENTER);
l1.addView(errorView);
scrollViewCon.addView(l1, lparams);
Why is this happening?

Change your xml as shown below -
Add fillViewport as true.
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="5dp"
android:fillViewport="true"
>
Removed the relative layout addition part as it is not required.

How to add a view programmatically to RelativeLayout?

Can you give me a very simple example of adding child view programmatically to RelativeLayout at a given position?
For example, to reflect the following XML:
<?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">
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="107dp"
android:layout_marginTop="103dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
I don't understand how to create an appropriate RelativeLayout.LayoutParams instance.

Heres an example to get you started, fill in the rest as applicable:
TextView tv = new TextView(mContext);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
params.leftMargin = 107
...
mRelativeLayout.addView(tv, params);
The docs for RelativeLayout.LayoutParams and the constructors are here

Firstly, you should give an id to your RelativeLayout let say relativeLayout1.
RelativeLayout mainLayout = (RelativeLayout) findViewById(R.id.relativeLayout1);
TextView mTextView = new TextView(context);
mTextView.setText("Dynamic TextView");
mTextView.setId(111);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
params.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
mainLayout.addView(mTextView, params);