Develop Reference

TextView is gone and Button is visible

Textview items are not visible. The Button below them is.
Tried changing the LinearLayout with RelativeLayout, changed the match_parent and content with 0dp. None of them worked. Only the button shows in the right spot as though the TextViews are there but invisible. These views are called in the onCreate() of the Activity.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="wrap_content"
android:orientation="vertical"
tools:context=".EnterData">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tvDateIn"
android:layout_marginStart="15dp"
android:layout_marginTop="15dp"
tools:text="Date"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tvDescIn"
android:layout_marginTop="15dp"
android:layout_marginStart="15dp"
tools:text="Description"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tvAmountIn"
tools:text="California"
android:layout_marginTop="15dp"
android:layout_marginStart="15dp"
android:textColor="#000"
android:textSize="17sp"/>
<Button
android:id="#+id/btnSendData"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="30dp"
android:text="Send Data"/>
</LinearLayout>

You try to use android:text instead of tools:text. tools:textonly visible in the Android Studio.
Or you should use yourTextView.setText("yourText") if you are using tools:text.

Instead of using tool:text in xml use android:text="abc" in textView.
As tool:text is used for android studio layout preview . It does not show text when you run your application .
While android:text is used to set text to textview, button etc.

Yep, it was all working and just placing android:text showed it.
Thank you very much.

TextView/EditText Explain only 1 line

I have created this, with 1 webview and 1 textview (tried also edittext) and a scrollview, but in the preview it explains all lines, when i launch it explain only 1 line. i tried to rmeove scrollview, webview...nothing...how can i do? Thank you
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
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="wrap_content"
android:orientation="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".ActivityMappa"
tools:showIn="#layout/activity_mappa"
>
<WebView
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_marginTop="50dp"
android:layout_marginRight="15dp"
android:layout_marginLeft="15dp"
android:layout_marginBottom="20dp"
android:id="#+id/webview" />
<EditText
android:id="#+id/testo"
android:layout_width="match_parent"
android:layout_height="126dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:background="#android:color/transparent"
android:clickable="false"
android:focusable="false"
android:inputType="textMultiLine"
android:lines="10"
android:scrollbars="vertical"
android:text="#string/testonavi_spawn"
android:textSize="15sp" />
</LinearLayout>
</ScrollView>
Preview on Android Studio
Preview on my Phone/Emulator

In strings.xml you must escape all ' of testonavi_spawnby \', for example: ...all\'Avamposto...
Take a look into the documentation for String resources.

Edittext height is given as 126dp. You'll not be able to see 30 lines in it. so make the layout_heigh of the edittext as "wrap_content". This will make the edittext dynamic. As the total content is in scrollview, you'll still be able to scroll and see the complete content

Did you try using
android:minLines=10
where 10 is the number of lines you want it to appear.
Since you have set the android:width="match_parent" maybe its going beyond the view change it to android:layout_width="wrap_parent".
Change the code to:
<TextView
android:id="#+id/testo"
android:layout_width="wrap_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:minLines="10"
android:text="#string/testonavi_spawn"
android:textSize="15sp" />
NOTE: Always use a TextView to display the text and EditText to edit any texts.

cant type in an EditText android

I have this xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/horizontalPadding"
android:paddingRight="#dimen/horizontalPadding"
android:paddingTop="#dimen/verticalPadding"
android:paddingBottom="#dimen/verticalPadding">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_vertical"
android:padding="#dimen/padding" >
<TextView
android:text="#string/training_exercise_set_weight"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/training_exercise_set_weight"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:inputType="numberDecimal"
android:ems="10" />
</LinearLayout>
</LinearLayout>
When my app is running the keyboard is visible and clickable, but the value of editText doesn't change. how can i resolve it?

If someone is interesed, i resolved using the EditText.requestFocus()

Try to replace android:ems="10" with android:maxEms="10" or android:maxLength="10", I'm not sure, what you want to achieve with this parameter
Hope, this will solve you issue

android:ems="10" is all about width of the view, however you are overriding this setting by layout_width property setting to match_parent.
It looks like you would want two EditTexts to be stretch equally and fill that LinearLayout, so here you wouldn't need ems at all. You would need maxLength instead.
Also note that to stretch those EditTexts you should set their widths to 0dp and set their weight to 1 (or something else. They should be equal).
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_vertical"
android:padding="#dimen/padding" >
<TextView
android:text="#string/training_exercise_set_weight"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/training_exercise_set_weight"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:inputType="numberDecimal"
android:maxLength="10" />
</LinearLayout>

For me, the problem was, I didn't let my PopupWindow be focused. Then I found out that my PopupWindow focusable was by default set to false. So, I try to add 1 new parameter that explicitly tells the PopupWindow is focusable. You can see it in my screenshot below. Previously I didn't pass the false value, only the first three values.
Now, I can type anything in the EditText. This one took a whole day to be resolved. 🤣

Textview is not truncating the text

Following is my .xml file
<?xml version="1.0" encoding="utf-8"?>
<TableRow xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center_vertical" >
...
<TextView
android:id="#+id/tvAlternateRoad"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="#dimen/fancy_dashboard_max_speed_circle_strock_size"
android:gravity="start"
android:text="Via A11"
android:lines="1"
android:textColor="#808080"
android:textSize="#dimen/fancy_dashboard_lable_size" />
</TableRow>
I am calling the above .xml file in my main view .xml as following,
<RelativeLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.85"
android:gravity="end"
android:orientation="horizontal" >
<TableLayout
android:id="#+id/layAlternateRoute"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_margin="#dimen/fancy_dashboard_max_speed_circle_strock_size"
android:background="#drawable/bg_round_rect_alternate_route" />
</RelativeLayout>
http://i.stack.imgur.com/a0KRs.png
I am displaying a view on the screen which has above TableRow element. I am setting this Textview tvAlternateRoad's text value at run time. Sometimes when Text is large then it is moving outside the view. I tried to truncate it using android:ellipsize="end" from some S.O. posts but it seems it is not working now a days.
Can somebody help me on this?

Give paddingRight to text view. Also, text view has width wrap content and no relation with any other view. So your text view width can exceed the rounded corner background image as per text length. So either give some maxWidth value or relate it to some other views.
Edit
I just made this 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" >
<TextView
android:id="#+id/textview_Statu"
style="#style/text_view_login_style"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/more_txt3_margin_t"
android:background="#android:color/white"
android:ellipsize="end"
android:singleLine="true"
android:text="1234567890qwertyuiopasdfghjklzxcvbnm"
android:textColor="#color/blue_end" />
</LinearLayout>
In graphical view, It looks like this
Its working fine.

I have noticed that TextView will do different things with respect to wrapping and truncating depending on the container it's in. Try having the TableRow cell be, for instance, a FrameLayout. Then put your TextView inside the FrameLayout and see what happens.

Just use:
android:singleLine="true" and android:ellipsize="end"
and set a fixed width for your textview like "match_parent" or something in dp like "180dp" etc.
singleLine="true" needs your textview to have a fixed width which is not provided by "wrap_content".
A textview will only show ellipses at the end of its view's bounds and since you have set "wrap_content" your textview does not have any fixed bounds.

try this
tablelayout should be
<TableLayout
android:id="#+id/tbl"
android:layout_height="wrap_content"
android:layout_width="match_parent"
>
the remaining part should be
<TableRow
android:layout_height="wrap_content"
android:layout_width="match_parent"
>
<TextView
android:id="#+id/tvAlternateRoad"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:ellipsize="end"
android:maxLines="1"
android:minLines="1"
android:layout_marginRight="#dimen/fancy_dashboard_max_speed_circle_strock_size"
android:gravity="start"
android:text="Via A11"
android:layout_weight="1"
android:textColor="#808080"
android:textSize="#dimen/fancy_dashboard_lable_size" />

Ok, after long effort I have solve the issue my self.
Logic:
fetch the screen size programmatically
int screen_width = context.getResources().getDisplayMetrics().widthPixels;
then I used 42% of the screen_width as maxwidth of textView
((TextView)alternate.findViewById(R.id.tvAlternateRoad)).setMaxWidth((int)(screen_width*0.42));
I have also set below values in xml
android:ellipsize="marquee"
android:maxLines="1"

Wrap Text - Android TextView

Before someone says that I should google this, I want to point out that I did and then i tried all the different methods to see what would work and nothing did for me. So, now that ugly business is out of the way on with my questions.... :)
I cannot seem to get a text view to wrap for me. Dont know why. Here is my XML code for the layout. It is a table layout that will be used for a listview in another xml layout.
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/ot_color_priority"
android:layout_height="fill_parent"
android:layout_width="20dp"
android:gravity="center_vertical"/>
<RelativeLayout>
<TextView
android:id="#+id/ot_ticket_number"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center"
android:textStyle="bold"/>
<TextView
android:id="#+id/ot_ticket_details"
android:layout_alignParentBottom="#id/ot_ticket_number"
android:layout_height="wrap_content"
android:layout_width="300dp"
android:layout_marginTop="15dp"
android:scrollHorizontally="false"
android:ellipsize="none"
android:maxLines="10"
android:text="This is a long dang string that never wants to freaking wrap worth a crap!"/>
</RelativeLayout>
</TableRow>
</TableLayout>
The data that is in the textview just continues to write off the screen to the right. I cannot get it to wrap. The only way I can seem to get it to work is if I set a DP value to the layout_width. I dont want to do that because it will be used on different devices screen resolutions and I am afraid that may cause some problems later on.
So please someone help me :(

You should set android:shrinkColumns="1" to your TableLayout.
It will shrink the second column which is occupied by RelativeLayout.

It's probably your RelativeLayout which does not have any width specified, so it is defaulting to "WRAP_CONTENT" :
http://developer.android.com/reference/android/widget/RelativeLayout.html#generateDefaultLayoutParams()
I should also point out that inside that TextView you have a child with a "match_parent" width, but the relative layout will sit next to an element with a "20dp" width.
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/ot_color_priority"
android:layout_height="fill_parent"
android:layout_width="20dp"
android:gravity="center_vertical"/>
<!-- this is the problem, the layout has no parameters set -->
<RelativeLayout>
<TextView
android:id="#+id/ot_ticket_number"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:gravity="center"
android:textStyle="bold"/>
<TextView
android:id="#+id/ot_ticket_details"
android:layout_alignParentBottom="#id/ot_ticket_number"
android:layout_height="wrap_content"
android:layout_width="300dp"
android:layout_marginTop="15dp"
android:scrollHorizontally="false"
android:ellipsize="none"
android:maxLines="10"
android:text="This is a long dang string that never wants to freaking wrap worth a crap!"/>
</RelativeLayout>
</TableRow>
</TableLayout>