We Keep Coding

Cannot find added elements in Tabbed Activity

I created a Tabbed Activity template project using Android Studio.
Then I created a LinearLayout with a nested TextView on it:
<LinearLayout
android:id="#+id/updateView"
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_marginTop="707dp"
android:orientation="vertical">
<TextView
android:id="#+id/updateTextView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="right"
android:text="TextView" />
</LinearLayout>
This view is shown on preview, but there's none of it in the built app.
When I try to get a reference to it from my code:
LinearLayout lastUpdate = findViewById(R.id.updateView)
I get null in runtime.
So, how can I modify the code?
Preview screenshot

I solved my problem by moving xml code of LinearLayout upper, than code of AppBarLayout, and modification of dynamic pixels (dp) of ViewPager and my textView

how to set android ImageView visibility inside an included layout?

We are using android API 17 in our application. I have defined a layout containing two images vies as below:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/image_container_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/image_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/image_1_resource"/>
<ImageView
android:id="#+id/image_2"
android:layout_marginTop="3dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/image_container_layout"
android:src="#drawable/image_2_resource"/>
This layout is included inside another layout as below:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
style="#style/wizard_content_style"
tools:context=".ui.Wizard"
android:orientation="vertical"
android:gravity="center_vertical"
android:layout_gravity="center_vertical"
>
<include layout="#layout/image_container_layout"
android:id="#+id/included_view"
/>
<TextView
style="#style/wizard_content_text_style_medium"
android:id="#+id/text_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/included_view"
android:layout_centerHorizontal="true"
android:gravity="center_horizontal"
android:layout_gravity="center_horizontal"
android:text="#string/instruction"
android:layout_marginBottom="15dp"/>
The reason that the layout is included is that we want to reuse it in two more layouts.
Now based on some condition I want to hide or show the image views inside image_container_layout.
The java code looks like this:
containerLayout = (ViewGroup) ((Activity) getAndroidContext()).getLayoutInflater().inflate(R.layout.image_container_layout, null);
image1 = (ImageView) containerLayout.findViewById(R.id.image_1);
image2 = (ImageView) containerLayout.findViewById(R.id.image_2);
switch (accuracy) {
case 1:
log().i(getClass().getSimpleName(), "case 1 chosen");
image1.setVisibility(View.VISIBLE);
image2.setVisibility(View.GONE);
log().i(getClass().getSimpleName(), "image 1 has been shown");
break;
case 2:
image1.setVisibility(View.GONE);
image2.setVisibility(View.VISIBLE);
break;
case 3:
image1.setVisibility(View.VISIBLE);
image2.setVisibility(View.VISIBLE);
break;
}
I am debugging this code and I am sure the code is running. The log messages are printed in Logcat as well, but nothing happens no change in the images. Also, both images are always shown.
I wonder if there is something that I have to do when working with the included layout?
Thanks for any help in advance.
Based on answers I got below, seems that inflating a view will create a new object and because of this, changes in the visibility are not shown on the user interface.
Then the question is that if we have a wizard and inside 3 different pages of the wizard I want to have an image and depending on some condition I want to show or hide the image, what is the best solution? I mean I want to reuse the code which is responsible for hiding and showing the image regardless which page of wizard is active.

Why are you complexing with so much code. If you include some layout in your xml then you can use those widgets also same as the xml have. There is no need to inflate.
ImageView image_2 = findViewById(R.id.image_2);
image_2.setVisbility(Visible.GONE);

You said at this comment the code not inside activity but wherever it is you inflated a new layout to your view currently displaying by this line:
containerLayout = (ViewGroup) ((Activity) getAndroidContext()).getLayoutInflater().inflate(R.layout.image_container_layout, null);
When you try to change visibility of those images actually it works, i think so. But if your activity or fragment layout contains image_container_layout maybe you see
those images.
And I wonder that what do you do with inflated view containerLayout. Do you add it to inside of any other view. If you dont it wont be visible for you.

you have to use it like this:
View included_view1 = findViewById(R.id.included_view1);
ImageView image_1 = included_view1.findViewById(R.id.image_1);
ImageView image_2 = included_view1.findViewById(R.id.image_2);
image_1.setVisibility(View.VISIBLE);
image_1.setVisibility(View.GONE);
image_2.setVisibility(View.VISIBLE)
image_2.setVisibility(View.GONE)
View included_view2 = findViewById(R.id.included_view2);
ImageView image_11 = included_view2.findViewById(R.id.image_1);
ImageView image_22 = included_view2.findViewById(R.id.image_2);
image_11.setVisibility(View.VISIBLE);
image_11.setVisibility(View.GONE);
image_22.setVisibility(View.VISIBLE)
image_22.setVisibility(View.GONE)
Above code will be helpful in the case of multiple time you want to use same layout.

findViewById Error cant find id in XML

I cant find out why my findViewById is not linking to the XML file and it is driving me nuts. The is is in the XML file but it is still not Finding it in the java MainActivity file.
here is my XML
<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"
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=".MainActivity" >
<EditText
android:id="#+id/editCentimeters"
android:layout_width="wrap_content"
android:layout_height="27sp"
android:layout_alignLeft="#+id/editInches"
android:layout_alignTop="#+id/textCentimeters"
android:ems="5" >
<Button
android:id="#+id/buttonConvert"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/editInches"
android:layout_centerHorizontal="true"
android:layout_marginTop="98dp"
android:text="#string/convert" />
And here is my Java
EditText etCentimeters = (EditText) findViewById(R.id.editCentimeters);
Button buttonConvert = (Button) findViewById(R.id.buttonConvert);

I was facing the same issue. Just comment out the line which is throwing the error & BUILD the project once. Intellisense (ctrl + space) then will show you the IDs.

You need to take care of 2 things here:-
EditText etCentimeters = (EditText) findViewById(R.id.editCentimeters);
Button buttonConvert = (Button) findViewById(R.id.buttonConvert);
Firstly, the above code should be present in the onCreate() method.
And next, you need to place that code snippet below this line in the onCreate() method, not before it.(I'm assuming that the setContentView is already present, if not, add that)
setContentView(R.layout.main);

use setContentView(R.layout.main); at the onCreate of your Activity

You can refresh project.
And also check ur setContentView(R.layout.YOURLAYOUT_NAME) in Your activity.
Make sure that u are using ur code in activity.

Just clean & build in order to find the ID.

Clean & build didn't work for me. I had to restart Android Studio.

TextView Not Accessible

I am new to Android.I am making a random generator program which on button click generates a number and display it on textview. I am unable to access textview when i type R.id. i don't get the name of the textview but i get the name of the other components. My layout code is:-
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="horizontal">
<EditText android:id="#+id/edit_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="#string/edit_message" />
<TextView android:id="#+id/txt02" android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send"
android:onClick="sendMessage" />
</LinearLayout>
Java code is:-
public void sendMessage(View view) {
// Do something in response to button
EditText editmessage = (EditText)findViewById(R.id.edit_message);
String message = editmessage.getText().toString();
Random r=new Random();
int i1=(r.nextInt(80) +65);
message += "\n " + i1;
// Create the text view
TextView textView = (TextView) findViewById(R.id.); // not able to access R.id.txt02
}

The problem most likely is that your R.java file hasn't been updated with the EditText you have added. In eclipse, you can force an update to do this. Try Project->Clean as mentioned by Michal Z. in the comments.
You can also set the option to build automatically in eclipse by checking the Project->Build Automatically option. This will ensure that eclipse will automatically build your project and update your R.java file every time you save your project.

If cleaning your project doesn't help, I'd check your source files to make sure there isn't a line saying "import android.R" in your imports because that will import the standard Android R object (which doesn't include any of your declared resources). Eclipse does this sometimes when you cut and paste code and it can be frustrating, but deleting the import and cleaning / building your project should fix it.

How can i use bangla font as a string value in android

how can i use bangla font in a android app as a string value in my string.xml file and also read in my UI.Advance thanks to answer

First open assets folder and create a new folder named font and then put Rupali.ttf in the fontfolder.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="#+id/DefaultFontText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:text="Here is some text." />
<TextView
android:id="#+id/CustomFontText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp"
android:text="ডিরেক্টর মমনক(!?) করতেছি অন্তত ঘড়িটা যেন বানাতে পারি আমি চেষ্টা করছি">
</TextView>
</LinearLayout>
And,
package com.amader;
import android.app.Activity;
import android.graphics.Typeface;
import android.os.Bundle;
import android.widget.TextView;
public class Fonts extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Typeface tf = Typeface.createFromAsset(getAssets(),
"font/Rupali.ttf");
TextView tv = (TextView) findViewById(R.id.CustomFontText);
tv.setTypeface(tf);
}
}
Shortcoming: All bangla combined words does not work properly. If anybody has the solution please let me know.

Please follow the process given below:
create folder named assets under app folder
create folder named fonts under assets folder
now put your desire bangla font file like durga.ttf or otf in fonts folder
Now go where you declare your textview and put this code:
yourTextView.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/Durga.ttf"));