I would like to be able to add a view to an already existing xml layout in code:
LinearLayout ll = (LinearLayout) findViewById(R.layout.common_list);
TextView tv = new TextView(this);
tv.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
tv.setText("sample text");
ll.addView(tv);
setContentView(ll);
When creating a new LinearLayout in code it works, but when using a Resource like in the code above it doesn’t.
common_list.xml:
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="Quick List"/>
</LinearLayout>
Try to use LayoutInflater
LinearLayout ll = (LinearLayout) LayoutInflater.from(this).inflate(R.layout.common_list)
TextView tv = new TextView(this);
tv.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
tv.setText("sample text");
ll.addView(tv);
setContentView(ll);
If this won't work, please add error from Logcat.
Also, you should change properties from android:layout_width="fill_parent" to android:layout_width="wrap_content" in yout LinearLayout in common_list.xml and also do the same thing to your TextView in common_list.xml
Why? Because your layout is horizontal-oriented and it fills whole screen space. Your TextEdit fills as much space as your layout does (so in this case it's whole screen space). Now, when you add another TextView it is adding properly - to right of your first TextEdit, so it's like out of screen. To understand exactly what happens:
-----------------
||-------------||---------------
||| TextViev1 ||||addedTextView|
||-------------||---------------
|| ||
|| ||
|| ||
|| ||
|| ||
||LinearLayout ||
||-------------||
| screen |
----------------
I also had this problem many times. Usually if you add View to layout and you don't see it (and you get no errors) problem is with width/heigth or position (ex. when you use RelativeLayout).
Related
I need to add TextViews to a Layout (RelativeLayout or LinearLayout I don't care) programatically.
I want something like this:
After the textview 4 there is no more space on the right side so the next TextView will be placed in a new Line bellow.
This is what I have done:
Create a LinearLayout in the xml file:
<LinearLayout
android:id="#+id/my_linear_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
</LinearLayout>
In my code, I loop over a list of Objects and add a new TextView for each objekt:
LinearLayout myLinearLayout = (LinearLayout) itemView.findViewById(R.id.my_linear_layout);
for(MyObject object : myObjectList) {
final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
params.setMargins(20, 0, 20, 0); // llp.setMargins(left, top, right, bottom);
final TextView textView = new TextView(context);
textView.setText(object.getName());
textView.setLayoutParams(params);
myLinearLayout.addView(textView, params);
}
But this is the result I get:
I have thought adding LinearLayouts vertically instead of TextViews, but still my problem is that I don't know when I need to add the next the next one, I mean, when there is no more space on the right side.
I have also tried it with TableLayout but still the same problem, I don't know when I have to add the next row.
Any ideas? Maybe there is a View that already solves that problem and I don't know...
I am having trouble adding a view in the scrollview. The structure of my xml is
// xml_layout.xml
<ScrollView>
<LinearLayout
android:id="#+id/container"
>
<LinearLayout>
<ListView
...
/>
</LinearLayout>
******Here I am trying to add an item *********
</LinearLayout>
</ScrollView>
I am trying to add a textview at the bottom programmatically as follows.
TextView v = new TextView(getActivity());
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
v.setText("TEST View");
v.setLayoutParams(params);
LinearLayout container = (LinearLayout) LayoutInflater.from(getActivity()).inflate(R.layout.xml_layout, null).findViewById(R.id.container);
container.addView(v, 1);
The goal I am trying to achieve is making a tablelayout that contains two columns with the title and listview in the second column. Before I do this, I tried to display a simple textview so that I know I can add a widget. I have tried many different ways but did not work. Is there something wrong with my code??
you must first verify that your LinearLayout 'container' is 'vertical ' orientation, and...
LinearLayout container = (LinearLayout) findViewById(R.id.container);
container.addView(v);
I'm trying to add a TextView programmatically, and it has proved immensely difficult. I have found code that works here (added to onCreate):
LinearLayout thisLayout = new LinearLayout(this);
setContentView(thisLayout);
TextView dynamicTextView = new TextView(this);
dynamicTextView.setText("Dynamically Added TextView");
thisLayout.addView(dynamicTextView);
The problem is that this erases all of the views I had created in the XML. There is a popular question with a highly upvoted answer HERE. Based on that, I created this:
LinearLayout myLayout = findViewById(R.layout.activity_main);
TextView tv = new TextView(this);
tv.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.FILL_PARENT));
tv.setText("Trying Again");
myLayout.addView(tv);
But there is an error on this line:
LinearLayout myLayout = findViewById(R.layout.activity_main);
I try to cast it like this, which silences the error, but immediately crashes:
LinearLayout myLayout = (LinearLayout) findViewById(R.layout.activity_main);
I'm curious what I'm doing incorrectly. I realize that there are many similar questions out there, but none of them seem to work and many point to the answer I connected here. The problem I'm having is that the answer just doesn't work at all. Also, I'm in the process of familiarizing myself with the Android environment so if there's anything I'm doing that seems "off", please point it out.
Here's my XML:
<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="vertical"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="lowri.morepractice.app.MainActivity">
<EditText android:id="#+id/edit_message"
android:layout_weight="1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="#string/edit_message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/button_send"
android:onClick="sendMessage"/>
</LinearLayout>
For anyone else who comes here, I also had to change the layout params to this:
tv.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
You can't request the layout by id. It doesn't point to the LinearLayout.
To actually get the LinearLayout you have to add an id to it
<LinearLayout
android:id="#+id/edit_linearlayout"
....
and request that like:
LinearLayout myLayout = (LinearLayout) findViewById(R.id.edit_linearlayout);
To add the the TextView you have to set the LayoutParams like in the question you posted. Doesn't have to be FILL_PARENT of course:
TextView tv = new TextView(this);
tv.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.FILL_PARENT));
tv.setText("Trying Again");
myLayout.addView(tv);
The error is because you are looking for an XML file in your resources.
Try this,
In your code:
LinearLayout myLayout = (LinearLayout) findViewById(R.id.layout_main);
In your XML
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/layout_main"
android:layout_width="match_parent"
You are using the xml and the LinearLayout wrong.
1- call this to set your xml as content view
setContentView(R.layout.activity_main);
2- give an id to your linear layout
android:id="#+id/myLinearLayout"
3- find your linear layout like this
LinearLayout myLayout = (LinearLayout) findViewById(R.id.myLinearLayout);
4- then add your view
TextView tv = new TextView(this);
tv.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.FILL_PARENT,
LinearLayout.LayoutParams.FILL_PARENT));
tv.setText("Trying Again");
myLayout.addView(tv);
I didn't try but this should work.
The mistakes you're doing are
1- SetContentView method overrides all the views in the content view. so it'll remove everything when you call
LinearLayout thisLayout = new LinearLayout(this);
setContentView(thisLayout);
2- You need to use id of an item while trying to find it. Not the name of the layout file like you did here
// findViewById gets the id of the view that you want to find
LinearLayout myLayout = (LinearLayout) findViewById(R.layout.activity_main);
I am trying to add TextView into a view which extends LinearLayout. When I set its width of layoutparams to fill_parent or wrap_content, the text inside TextView will display vertically such like the following.
e.g.
T
E
X
T
However, when I set the width to some fixed number, it will display normally or as I expected.
e.g. TEXT
My question is why this happens and how to solve it, i.e. how I should set programmatically so that TextView can write text horizontally without setting a fixed width to it such as setting fill_parent or wrap_content?
Here is setting of XML code of the parent ilGallery which extends LinearLayout:
<?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:orientation="vertical" >
<com.illib.ilgallery.view.ILGallery
android:id="#+id/galleryLayout"
android:layout_height="fill_parent"
android:layout_width="fill_parent"/>
</LinearLayout>
The following is the code how i initialize the children inside it:
ilViewPager = new ILViewPager(context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT);
ilViewPager.setLayoutParams(params);
ilgallery = this;
//initialize default header and footer view
LinearLayout.LayoutParams params2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
headerView = new TextView(context);
headerView.setLayoutParams(params2);
((TextView)headerView).setTextSize(TypedValue.COMPLEX_UNIT_PX,40);
((TextView)headerView).setText("hello");
footerView = new TextView(context);
footerView.setLayoutParams(params2);
((TextView)footerView).setTextSize(TypedValue.COMPLEX_UNIT_PX,40);
((TextView)footerView).setText("hello2");
There appears to be only a single item inside your LinearLayout. Please set the orientation of the LinearLayout to "horizontal", like this:
android:orientation="horizontal"
Also, whenever possible instead of creating new LayoutParams objects from scratch, you should get the LayoutParams from the current layout and modify that, like this:
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)ilViewPager.getLayoutParams();
lp.<change-any-values>;
ilViewPager.setLayoutParams(lp);
Context: I have a TableLayout (created using XML), which has one TableRow, which has one TextView. The code:
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:fillViewport="true"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TableLayout
android:id="#+id/mytable"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="1"
>
<TableRow>
<TextView
android:id="#+id/add_alarm"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:gravity="center"
android:text="New\nItem"
android:textSize="30sp"
/>
</TableRow>
</TableLayout>
</ScrollView>
In my Activity's onCreate() method, I am trying to add another View to the TableRow dynamically. Here is the code:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LayoutInflater inflater = LayoutInflater.from(this);
View mainLayout = inflater.inflate(R.layout.main, null);
TableLayout tl = (TableLayout) mainLayout.findViewById(R.id.mytable);
TableRow tr = (TableRow) tl.getChildAt(0);
Log.d(TAG, "tr class = " + tr.getClass().getName() + " | width = " + tr.getWidth() + "\n");
final RelativeLayout rl = (RelativeLayout) inflater.inflate(R.layout.alarm_widget, null);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1);
tr.addView(rl, lp);
tl.invalidate();
setContentView(mainLayout);
}
Question: This code is not having the intended effect of displaying both the Views (the one in the XML layout already & the other added dynamically) in a columns of equal width.
With the code given above, the dynamically added View has a width of '0' and is therefore invisible.
If I change the code to tr.addView(rl) (i.e. without reference to LayoutParams), the dynamically added view is visible, but the columns are not equal in width.
How can I achieve this?
Edit: I changed the code based on the comments to the following. It still doesn't work as expected:
TableLayout.LayoutParams lp = new TableLayout.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT,
TableLayout.LayoutParams.WRAP_CONTENT, 1f);
tr.addView(rl, lp);
The problem is this behavior defined for TableRow:
The children of a TableRow do not need to specify the layout_width and layout_height attributes in the XML file. TableRow always enforces those values to be respectively MATCH_PARENT and WRAP_CONTENT.
Rather than add your text views directly to the TableRow, have the TableRow hold a horizontal LinearLayout and add the second view to that holder.
(Also, using LinearLayout.LayoutParams for something that's going into a TableRow is wrong. You should have been using TableRow.LayoutParams. But that wouldn't be the way to get equal-width TextViews. Use a LinearLayout holder.)
I think it's not a good idea to dynamically add an item to a TableRow - it defeats the purpose of using a table. Imagine if you add an item to the first row of the table, but not on the second, meaning the first row has more elements. It wouldn't look much like a table.
But if you insist,
From developer guide:
The children of a TableRow do not need to specify the layout_width and layout_height attributes in the XML file. TableRow always enforces those values to be respectively MATCH_PARENT and WRAP_CONTENT.
You may need to start looking on the layout_weight of each element. Try adding layout_weight=1 on the row's static elements, and then setting your dynamic RelativeLayout's weight to 1 before adding it to the row.
rl.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT, 1f));
The last parameter is weight.
Set height like this to the layout containing the ScrollView.
It solved my own problem where tablelayout does not show last lines.
android:layout_height="0dp"