Develop Reference

How to put the TextView at the Center?

The following is the code of main.xml, which i have used to create a row adapter for JSON
<?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:padding="4dp"
android:orientation="vertical"
android:weightSum="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_weight="0.88"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="pumpName"
android:id="#+id/tvPump" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Time"
android:id="#+id/tvTime"
android:gravity="center_vertical" />
</LinearLayout>
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/ivIcon"
android:src="#drawable/yes" />
</FrameLayout>
</LinearLayout>
</LinearLayout>
The above code produces no error but the Time TextView does not come at the center.
I have tried android:gravity="center" but it did not work.
This is the image of my android studio

Relative Layout could come in handy here like so:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="4dp">
<TextView
android:id="#+id/tvPump"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="pumpName"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/tvTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:gravity="center"
android:text="Time"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ImageView
android:layout_width="wrap_content"
android:id="#+id/ivIcon"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_height="wrap_content"
android:src="#drawable/yes" />
</RelativeLayout>

button not displaying right side of the layout in android

Hi in this Layout i have two button's named as back and home same names i mentioned as id's for both.Now left side i want to display back button and right side corner i want to display home.But home button not displaying at the right corner.Now if i mention margin left it's not showing properly.Can any one please help me
xml
<?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" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:background="#FF0000"
android:orientation="horizontal">
<Button
android:id="#+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/back"
/>
<TextView
android:id="#+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textStyle="bold"
/>
<Button
android:id="#+id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/home"
android:layout_marginLeft="60dp"
/>
</LinearLayout>
</LinearLayout>

Try this,
<?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" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:background="#FF0000"
android:orientation="horizontal"
android:weightSum="100" >
<Button
android:id="#+id/back"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_weight="20"
android:background="#drawable/back" />
<TextView
android:id="#+id/tv"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="60"
android:gravity="center"
android:text="Hello"
android:textStyle="bold" />
<Button
android:id="#+id/home"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_marginLeft="60dp"
android:layout_weight="20"
android:background="#drawable/home" />
</LinearLayout>
</LinearLayout>

Try below code xml file:
<?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" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:background="#FF0000"
android:orientation="horizontal">
<Button
android:id="#+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:background="#drawable/back"
/>
<TextView
android:id="#+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center"
android:textStyle="bold"
/>
<Button
android:id="#+id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/home"
android:layout_alignParentRight="true"
android:layout_marginLeft="60dp"
/>
</RelativeLayout>
</LinearLayout>

Try this way,hope this will help you to solve your problem.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="30dp"
android:background="#FF0000"
android:orientation="horizontal"
android:gravity="center">
<Button
android:id="#+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/back"/>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center">
<TextView
android:id="#+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textStyle="bold"/>
</LinearLayout>
<Button
android:id="#+id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/home"/>
</LinearLayout>

why don't you use relative layout for that, see that
<?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" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:background="#FF0000"
android:orientation="horizontal" >
<Button
android:id="#+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/account_settings" />
<TextView
android:id="#+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:textStyle="bold" />
<Button
android:id="#+id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="#drawable/account_settings"
android:gravity="center_horizontal" />
</RelativeLayout>
</LinearLayout>
if you want to do this with linear layout use weight sum
<LinearLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:background="#FF0000"
android:weightSum="3"
android:orientation="horizontal" >
<Button
android:id="#+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#drawable/account_settings" />
<TextView
android:id="#+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="1"
android:textStyle="bold" />
<Button
android:id="#+id/home"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:layout_weight="1"
android:background="#drawable/account_settings" />
</LinearLayout>
</LinearLayout>

How to Stack two Android elements in the center of the screen

I want the editText and the button to be stacked on top of each other in the center of the screen. There's obviously an incredibly simple method I'm missing. Here they stick to the top left of the screen. Any help would be appreciated. I tried relative layout as well but then they're on top of each other in the Z-axis.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center_vertical"
>
<EditText
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
/>
<Button
android:text="Go >"
android:layout_width="200dp"
android:layout_height="wrap_content"
/>

Use a relative layout and put your elements on top of each others :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical">
<EditText
android:id="#+id/tv_main"
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_centerHorizontal="true"/>
<Button
android:id="#+id/button_main"
android:text="Go >"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="#id/tv_main"
android:layout_centerHorizontal="true"/>
</RelativeLayout>

Try the following data
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
>
<EditText
android:text="#string/hello_world"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center"
/>
<Button
android:text="Go >"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center"
/>
</LinearLayout>

You can wrap the edit text and Button in a vertical layout:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center"
android:orientation="vertical" >
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="#string/hello_world" />
<Button
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="Go >" />
</LinearLayout>

I would recommend to use RelativeLayout.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
</RelativeLayout>

Just use android:gravity="center" in your layout, it'll do the job for you.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center">
<EditText
android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"/>
<Button
android:text="Go Went Gone"
android:layout_width="200dp"
android:layout_height="wrap_content"/>
</LinearLayout>

Place textview left and right above a button

I have following relative layout:
<?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:gravity="center"
android:orientation="vertical">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_alignLeft="#id/button1"/>
<TextView
android:id="#+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_alignRight="#id/button1" />
</RelativeLayout>
<Button
android:id="#+id/button1"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
But this is not giving me the result I expected
I want to achieve the following:
tv1--------------tv2
|------Button------|
So, I want textview1 to start at the left corner of the button and textview2 to end at the right edge of the button.
How can I achieve this ?

<?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:gravity="center"
android:orientation="vertical">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_alignLeft="#+id/button1"/>
<TextView
android:id="#+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_alignRight="#+id/button1" />
<Button
android:id="#+id/button1"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="Button"
android:layout_below="#+id/tv1" />
</RelativeLayout>
</LinearLayout>

try this
<?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:gravity="center"
android:orientation="vertical">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_alignParentLeft="true"/>
<TextView
android:id="#+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_alignParentRight="true"/>
</RelativeLayout>
<Button
android:id="#+id/button1"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>

Put the button inside your relative layout. And then add this to the button xml properties -
android:layout_below="#+id/tv1"
For tv1 textview, add -
android:layout_alignLeft="button1"
for tv2 textview, add -
android:layout_alignRight="button1"

try this
<?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:gravity="center"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_alignParentRight="true"/>
<TextView
android:id="#+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="#id/tv2"/>
</RelativeLayout>
<Button
android:id="#+id/button1"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="Button" />
</LinearLayout>
you need to set either android:layout_toLeftOf="#id/tv2" for tv1 or android:layout_toRightOf="#id/tv1" for tv2 to stop overlapping each other.

How to make fill parent for element in left side

How to make spinner to fill empty place in left side?
android:layout_width="fill_parent" does not help.
XML layout:
<Spinner
android:id="#+id/spn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Text1" />
<TextView
android:id="#+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Text2" />
</LinearLayout>

I would make use of a Relative Layout and Linear Layout combination to achieve 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" >
<Spinner
android:id="#+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/lin_layout" />
<LinearLayout
android:id="#+id/lin_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="asd" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="fgdas" />
</LinearLayout>
</RelativeLayout>
The Output,

Andro solution's above is perfect as per your need .....
but if data in text view is dynamic and may be too long then can try android:weightSum="1" here
<?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"
android:weightSum="1"
>
<Spinner
android:id="#+id/spinner"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".8" />
<LinearLayout
android:id="#+id/lin_layout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight=".2" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="text1" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="text2" />
</LinearLayout>
</LinearLayout>