At the moment everything is done through the java code. I'm creating a relative layout then adding my GL surface view and some text views to it. the problem is I cant align one text view to the top left and the other to the top right. Whats wrong with my code. Also is there a more efficient way of doing this such as doing this through XML instead. Cause I've tried this and it didn't work.
r1 = new RelativeLayout(this);
view = new MyGLSurfaceView(this);
view.setKeepScreenOn(true);//keeps activity from going to sleep
r1.addView(view);
TextView text1 = new TextView(this);
TextView text2 = new TextView(this);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 50);
RelativeLayout.LayoutParams rp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 200);
lp.addRule(RelativeLayout.ALIGN_RIGHT);
text1.setLayoutParams(lp);
text1.setText("3 Star");
text1.setBackgroundColor(0x4060ff70);
rp.addRule(RelativeLayout.ALIGN_LEFT);
text2.setLayoutParams(rp);
text2.setText("4 Star");
text1.setTextSize(30);
text2.setTextSize(30);
//text2.setBackgroundColor(0x4060ff70);
r1.addView(text1);
r1.addView(text2);
setContentView(r1);
This can be done in XML like so:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Left" />
<TextView
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Right" />
</RelativeLayout>
Related
I have been looking these past two days on questions regarding setting the weight of a layout or a group of layouts programmatically.
all the answers i found are almost the same so that means i know what code no to use but i do not seem to understand how to assign the float attribute. in the following code.
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT,
1.0f
);
YOUR_VIEW.setLayoutParams(param);
would someone please give me an example of how to assign the weights of two TextView with a weight sum of 3???
It depends on your view if you want to split the view horizontally between them you can use something like this.
TextView secondTV = findViewById(R.id.secondTextView);
TextView firstTV = findViewById(R.id.firstTextView);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(0, ViewGroup.LayoutParams.MATCH_PARENT, 3);
LinearLayout.LayoutParams layoutParams1 = new LinearLayout.LayoutParams(0, ViewGroup.LayoutParams.MATCH_PARENT, 1);
firstTV.setLayoutParams(layoutParams);
secondTV.setLayoutParams(layoutParams1);
And your layout looks like this
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="#+id/firstTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hello" />
<TextView
android:id="#+id/secondTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/icon"
android:text="Hello" />
</LinearLayout>
but if you want to split the view vertically you can use something like this.
TextView secondTV = findViewById(R.id.secondTextView);
TextView firstTV = findViewById(R.id.firstTextView);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0, 3);
LinearLayout.LayoutParams layoutParams1 = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0, 1);
firstTV.setLayoutParams(layoutParams);
secondTV.setLayoutParams(layoutParams1);
And your layout looks like this
<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/firstTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hello" />
<TextView
android:id="#+id/secondTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/icon"
android:text="Hello" />
</LinearLayout>
I want to create a scroll view list which would show "boxes" or more accurately custom made layouts (I'm using a custom class that extends a RelativeLayout - basically shows different pieces of information, some are static like places' working hours and some change dynamically and will be pulled from a server).
Though I encountered a problem - I (for the sake of seeing if my solution works) created 5 boxes and added them to the scroll view list but it seems like they are stacked upon each other. What's the proper way to make them appear one under another without manually tweaking their position coordinates? I was using addView() for that purpose but it doesn't work as intended for me or I use it poorly. If you know the answer, please briefly describe how this should be done.
Thanks in advance!
EDIT, here goes the code:
public class RestaurantBox extends RelativeLayout {
RestaurantBox (Context context){
super(context);
this.setBackgroundColor(context.getResources().getColor(R.color.colorAccent));
TextView restaurantName = new TextView(context);
restaurantName.setText("Test Restaurant");
RelativeLayout.LayoutParams restNameParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
this.addView(restaurantName, restNameParams);
restaurantName.setTypeface(null, Typeface.BOLD);
TextView freeSpots = new TextView(context);
freeSpots.setText("15/20");
RelativeLayout.LayoutParams freeSpotParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
freeSpotParams.topMargin = restNameParams.bottomMargin + 50;
this.addView(freeSpots, freeSpotParams);
TextView book = new TextView(this.getContext());
RelativeLayout.LayoutParams bookParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
book.setText("Book");
bookParams.setMargins(0,freeSpotParams.bottomMargin + 100,0,0);
this.addView(book, bookParams);
}
}
public class BrowseRestaurants extends AppCompatActivity {
int restaurantCount;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_browse_restaurants);
Intent intent = getIntent();
String login = intent.getStringExtra("LOGIN");
TextView text = (TextView) findViewById(R.id.txtWelcomeUser);
text.setText("Welcome, " + login);
RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.relLayoutRestaurants);
RestaurantBox initRBox = new RestaurantBox(this);
initRBox.setTop(0);
initRBox.setBottom(300);
relativeLayout.addView(initRBox);
for(int i=1;i<5;i++){
final View view = relativeLayout.getChildAt(i-1);
RestaurantBox restaurantBox = new RestaurantBox(this);
restaurantBox.setTop(view.getBottom() + 50);
restaurantBox.setBottom(restaurantBox.getTop() + 300);
relativeLayout.addView(restaurantBox);
}
}
}
<!-- activity_browse_restaurants.xml-->
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="match_parent"
android:fillViewport="true"
android:orientation="vertical"
tools:context="com.konrad.rezerwacje1.BrowseRestaurants">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/scrollViewRestaurants"
android:layout_below="#+id/txtWelcomeUser"
android:layout_alignParentStart="true">
<RelativeLayout
android:id="#+id/relLayoutRestaurants"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="65dp"
android:orientation="vertical">
</RelativeLayout>
</ScrollView>
<TextView
android:id="#+id/txtLogout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/Logout"
android:textColor="#android:color/holo_red_dark"
android:textSize="18sp"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true" />
<TextView
android:id="#+id/txtWelcomeUser"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="#style/TextAppearance.AppCompat.Display1"
android:textColor="#android:color/holo_blue_dark"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="9dp" />
</RelativeLayout
>
you are adding view in RelativeLayout so view stacking on each other so change it to LinearLayout in activity_browse_restaurants.xml
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/scrollViewRestaurants"
android:layout_below="#+id/txtWelcomeUser"
android:layout_alignParentStart="true">
<LinearLayout
android:id="#+id/relLayoutRestaurants"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="65dp"
android:orientation="vertical">
</LinearLayout>
</ScrollView>
now make changes according to in BrowseRestaurants.class
replace
RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.relLayoutRestaurants);
with
LinearLayout relativeLayout = (LinearLayout) findViewById(R.id.relLayoutRestaurants);
else will be fine if you want to change variable name its up to u, let me know if any problem
I have Vertical ScrollView where I am going to add some Views after a buttonClick. Here is the xml of the scroll view
<ScrollView
android:background = "#drawable/border"
android:layout_weight="31"
android:id="#+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="0dp" >
<LinearLayout
android:id="#+id/layoutScroll"
android:padding = "10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/layoutContainer"
android:padding="5dp"
android:orientation="vertical"
android:background="#drawable/border_2"
android:layout_width="fill_parent"
android:layout_height = "wrap_content">
<RelativeLayout
android:id="#+id/relativeLayout"
android:layout_height = "wrap_content"
android:layout_width = "fill_parent">
<TextView
android:id="#+id/textWord"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/word"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/textNumber"
android:background = "#drawable/border_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text=" 1 "
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
<EditText
android:id="#+id/editWord"
android:layout_marginTop="3dp"
android:layout_gravity="left"
android:inputType="text"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:lines="1"
android:scrollbars="horizontal"/>
<TextView
android:id="#+id/textDefinition"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text = "#string/definition" />
<EditText
android:id="#+id/editDefinition"
android:gravity="top|left"
android:inputType="textMultiLine"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:lines="3"
android:maxLines="3"
android:scrollbars="vertical"/>
</LinearLayout>
<TextView
android:id="#+id/textEmpty"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:lines="1"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
</ScrollView>
In this function I create the same objects for adding them to the LinearLayout
private void initInterface (){
layoutScroll = (LinearLayout) findViewById (R.id.layoutScroll);
layoutContainer = new LinearLayout(getApplicationContext());
relativeLayout = new RelativeLayout(getApplicationContext());
textWord = new TextView(getApplicationContext());
textDefinition= new TextView(getApplicationContext());
textNumber = new TextView(getApplicationContext());
textEmpty = new TextView(getApplicationContext());
editWord = new EditText(getApplicationContext());
editDefinition = new EditText(getApplicationContext());
layoutContainer.setPadding(5, 5, 5, 5);
layoutContainer.setOrientation(LinearLayout.VERTICAL);
layoutContainer.setBackgroundResource(R.drawable.border_2);
LinearLayout.LayoutParams param1 =
new LayoutParams(LayoutParams.MATCH_PARENT , LayoutParams.WRAP_CONTENT );
layoutContainer.setLayoutParams(param1);
RelativeLayout.LayoutParams param2 =
new RelativeLayout.LayoutParams (RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
relativeLayout.setLayoutParams(param2);
textWord.setLayoutParams(param2);
textWord.setTextAppearance(this,android.R.style.TextAppearance_Medium);
textWord.setText("Word:");
RelativeLayout.LayoutParams param3=
new RelativeLayout.LayoutParams
(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
param3.addRule(RelativeLayout.ALIGN_PARENT_TOP);
param3.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
textNumber.setBackgroundResource(R.drawable.border_1);
textNumber.setTextAppearance(this,android.R.style.TextAppearance_Medium);
textNumber.setLayoutParams(param3);
relativeLayout.addView(textWord);
relativeLayout.addView(textNumber);
LinearLayout.LayoutParams param4 = param1;
param4.setMargins(0, 3, 0, 0);
editWord.setGravity(Gravity.LEFT);
editWord.setTextAppearance(this,android.R.style.TextAppearance_Medium);
editWord.setLines(1);
editWord.setHorizontallyScrolling(true);
editWord.setLayoutParams(param4);
textDefinition.setLayoutParams(param1);
textDefinition.setTextAppearance(this,android.R.style.TextAppearance_Medium);
textDefinition.setText("Definition:");
editDefinition.setGravity(Gravity.TOP | Gravity.LEFT);
editDefinition.setSingleLine(false);
editDefinition.setLayoutParams(param1);
editDefinition.setMaxLines(3);
editDefinition.setLines(3);
editDefinition.setVerticalScrollBarEnabled(true);
editDefinition.setImeOptions(EditorInfo.IME_FLAG_NO_ENTER_ACTION);
textEmpty.setTextAppearance(this,android.R.style.TextAppearance_Medium);
textEmpty.setLines(1);
textEmpty.setLayoutParams(param1);
layoutContainer.addView(relativeLayout);
layoutContainer.addView(editWord);
layoutContainer.addView(textDefinition);
layoutContainer.addView(editDefinition);
}
And then I add them to the Layout like this.
public void onCLick_Add(View v){
layoutScroll.addView(layoutContainer);
layoutScroll.addView(textEmpty);
}
The problem is that It only workd once . When I click the button for the second time the app crashes.
Thank you in advance.
Your log says:
Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
You are trying to add same layoutContainer and textEmpty multiple times when clicking multiple times. This fails because they are already added and therefore already have a parent. (You cannot add same View to more then one parent)
Solution
I guess you want to create a new View every time you press the button and add this to your layoutScroll. You should call your init-method again for every click:
public void onCLick_Add(View v){
initInterface();
layoutScroll.addView(layoutContainer);
layoutScroll.addView(textEmpty);
}
I would also suggest to divide initInterface() into:
private View createLayoutContainer();
private View createTextEmpty();
Make sure you take initialization of scrollView outside (e.g. onCreate) and you declare views like layoutContainer localy in the createLayoutContainer() instead of globally.
Here a snippet how it would look:
private View createLayoutContainer(){
LinearLayout layoutContainer = new LinearLayout(getApplicationContext());
RelativeLayout relativeLayout = new RelativeLayout(getApplicationContext());
TextView textWord = new TextView(getApplicationContext());
...
return layoutContainer;
}
public void onCLick_Add(View v){
layoutScroll.addView(createLayoutContainer());
layoutScroll.addView(createTextEmptyView());
}
The problem occurs due to the fact that a ScrollView can only have on child View. In other words, a ScrollView can have a LinearLayout or a RelativeLayout or a TextView etc. Update your code such that new views inside are added inside LinearLayout (layoutScroll) instead of ScrollView.
As I pointed out in the comment, the bug is this : Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
Checklist for these kind of bugs.
As pointed out in this post the specified child already has a parent
Double check all your addView calls.
Make sure not to add any view more then once. When a View is allready
used (e.g., you got it with findViewById, don't use addView on it.
When you want to add a view, use addView with a NEW view. You can add
several of these new views to one view, but you cannot add that one
view multiple times.
You can't re-use a view simply by changing some
stuff. You CAN re-use a variable, but you need to make a new view if
you want to re-add it using addView.
In my android app, I want to create a linear layout of 1 row and 3 columns. Then in each cell, add a new linear layout with 1 column and 2 rows.
Currently it does that, but the width of each of the three cells are wrapping the content, so the overall width of the main linear layout is smaller than the screen width. I want it to match the screen width and then horizontally center the contents of the content of each of the three cells.
Does anyone know how to fix this?
Thanks
This is the code I have
LinearLayout layout = new LinearLayout(this);
layout.setWeightSum(1);
layout.setOrientation(LinearLayout.HORIZONTAL);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
layout.setLayoutParams(params);
LayoutParams lparams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
// ---------
LinearLayout Celllayout = new LinearLayout(this);
Celllayout.setOrientation(LinearLayout.VERTICAL);
Celllayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
TextView titleView = new TextView(this);
titleView.setLayoutParams(lparams);
titleView.setText("Use This");
RadioButton useMapRadio = new RadioButton(this);
Celllayout.addView(titleView);
Celllayout.addView(useMapRadio);
layout.addView(Celllayout);
// ---------
Celllayout = new LinearLayout(this);
Celllayout.setOrientation(LinearLayout.VERTICAL);
Celllayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
titleView = new TextView(this);
titleView.setLayoutParams(lparams);
titleView.setText(date);
ImageButton imagebutton = new ImageButton(this);
imagebutton.setImageResource(R.drawable.calendar);
imagebutton.setBackgroundResource(0);
Celllayout.addView(titleView);
Celllayout.addView(imagebutton);
layout.addView(Celllayout);
// ---------
Celllayout = new LinearLayout(this);
Celllayout.setOrientation(LinearLayout.VERTICAL);
Celllayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
titleView = new TextView(this);
titleView.setLayoutParams(lparams);
titleView.setText("Delete");
imagebutton = new ImageButton(this);
imagebutton.setImageResource(R.drawable.x);
imagebutton.setBackgroundResource(0);
Celllayout.addView(titleView);
Celllayout.addView(imagebutton);
layout.addView(Celllayout);
// ---------
linearlayout.addView(layout);
This is 3 textView in horizontal layout, the main idea is : width of all items in
row must be ==0, and weigth for all items must be the same
<TextView
android:id="#+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="#string/start_training"
android:textColor="#84d9f4"
android:textSize="18sp"
android:textStyle="bold" />
<TextView
android:id="#+id/textView4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:text="#string/upd_params"
android:textColor="#84d9f4"
android:textSize="18sp"
android:textStyle="bold" />
<TextView
android:id="#+id/textView5"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="df"
/>
</LinearLayout>
Use Styles, it works like CSS :: Styles in Android
And yeah, it would be better to make layout's in XML
I want to add EditText to canvas in specific coordinates.
Something like this :
I tried to use code :
LinearLayout layout = new LinearLayout(context);
EditText textView = new EditText(context);
textView.setVisibility(View.VISIBLE);
textView.setText("Hello world");
layout.addView(textView);
layout.measure(canvas.getWidth(), canvas.getHeight());
layout.layout(0, 0, canvas.getWidth(), canvas.getHeight());
layout.setGravity(Gravity.BOTTOM);
layout.draw(canvas);
But this EditText wasn't show keyboard on click. Can you help me?
Assuming you really need to draw it on a canvas...
Create a new canvaslayout.xml inside your res/layout folder.
<?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:orientation="vertical" >
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:ems="5" >
<requestFocus />
</EditText>
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/editText1"
android:layout_toRightOf="#+id/editText1"
android:text="Edit Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
Change code too
LinearLayout layout = findViewById(R.layout.canvaslayout);
//LinearLayout layout = youractivity.findViewById(R.layout.canvasLayout);
layout.draw(canvas);
Programmaticly:
If you don't want to use XML (I don't see why not) you can use this method. You change the linear layout to a relative layout and use something like this to put views to the right off another view.
RelativeLayout.LayoutParams relativeLayoutParams=
new RelativeLayout.LayoutParams((RelativeLayout.LayoutParams.WRAP_CONTENT),(RelativeLayout.LayoutParams.WRAP_CONTENT));//create params for new textview
relativeLayoutParams.addRule(RelativeLayout.RIGHT_OF, textView.getId());//to align the textview side by side