i'd appreciate any help with following.
i have created a custom component - MyButton class that extends Button. I can set attributes in the constructor but i don't want to do this. i would like to set attributes in xml layout file. how do i get the attributes into the constructor so that when i create a new button in an activity, the new button is created using the xml layout file?
i've tried using inflator but it does not work in class extending button. is there another way that does the same? - i've spent hours searching net but nothing satisfactory came up.
thanks in advance
clive
here's the code
public class CustomViewModify2Activity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MyButton myb = (MyButton)findViewById(R.id.mybutton1);
myb.setText("hello");
}
}
the class:
public class MyButton extends Button {
public MyButton(Context context) {
super(context);
this.setBackgroundColor(getResources().getColor(R.color.Red));
}
public MyButton(Context context, AttributeSet attrs) {
super(context, attrs);
this.setBackgroundColor(getResources().getColor(R.color.Yellow));
}
}
the main.xml`
<idig.za.net.MyButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/mybutton1"
/>
`
the button_layout.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent" android:id="#+id/my_button_layout">
<Button android:text="Button" android:id="#+id/button1"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:background="#color/Yellow" android:gravity="center"
android:width="100dp" android:textStyle="bold" android:textSize="24sp"
android:textColorLink="#color/Red"></Button>
I think in the xml you can specify
<packagename.MyButton
instead of
<Button
and you will be able to specify attributes as if it were a normal button. That's what i did in my app.
XmlPullParser parser = resources.getXml(myResouce);
AttributeSet attributes = Xml.asAttributeSet(parser);
and then call the second constructor.
See http://developer.android.com/reference/android/util/AttributeSet.html
Related
I've got a custom view for my app named AvatarView:
<?xml version="1.0" encoding="utf-8"?>
<com.ulouder.views.AdvancedRelativeLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_gravity="center_horizontal"
android:layout_margin="0dp"
android:padding="0dp"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CP"
android:id="#+id/initialsView"
android:layout_alignTop="#+id/avatarView"
android:layout_alignLeft="#+id/avatarView"
android:layout_alignBottom="#+id/avatarView"
android:layout_alignRight="#+id/avatarView"
android:background="#drawable/avatar_background"
android:textColor="#color/white"
android:gravity="center"
android:textStyle="bold"
android:textSize="8sp" />
<com.makeramen.roundedimageview.RoundedImageView
app:riv_corner_radius="20dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/avatarView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="4dp"
android:layout_marginLeft="4dp"
android:layout_marginBottom="4dp"
app:riv_border_color="#color/lightGray"
app:riv_border_width="0.2dp" />
</com.uLouder.views.AdvancedRelativeLayout>
AdvancedRelativeLayout is just a superclass of RelativeLayout with a small fix, nothing special there. Then, I've created a view that uses my custom view:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<com.ulouder.views.AvatarView
android:layout_width="50dp"
android:layout_height="50dp"/>
</LinearLayout>
Nothing fancy either. But in the designer view of the second layout XML, I'm getting this:
The editor displays my view hierarchy like it has a nested instance of itself, while clearly there isn't. If I delete either one, they both get deleted. If I declare attributes on one of them, other also gets it. They are clearly the same instance. The only exception is setting an ID. Then the problem disappears, and only single instance is displayed as expected.
I've rebuilt the project, restarted Android Studio, but it's still the same. What am I doing wrong?
UPDATE: Nope, now, after editing id, the problem still continues again.
UPDATE 2: It's not just a layout so I can't use <include> tag. It's a custom view which has custom logic inside.
UPDATE 3: Here is my custom view's (relevant) code:
public class AvatarView extends FrameLayout {
public AvatarView(Context context) {
super(context);
init();
}
TextView initialsView;
RoundedImageView imageView;
public AvatarView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
void init(){
inflate(getContext(), R.layout.view_avatar, this);
initialsView = (TextView) findViewById(R.id.innerInitialsView);
imageView = (RoundedImageView) findViewById(R.id.innerImageView);
}
#SuppressWarnings("SuspiciousNameCombination")
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, widthMeasureSpec); //always square
imageView.setCornerRadius(widthMeasureSpec / 2f);
initialsView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, widthMeasureSpec * 30f);
}
}
UPDATE 4: It appears that this happens wherever I put my custom AvatarView class, not just at one place.
I did not find any reason to inflate the same view inside your class constructor method after checking the custom views documentation. Try to remove the inflate inside your init method.
...
public AvatarView(Context context) {
super(context);
init();
}
...
public AvatarView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
void init(){
// inflate(getContext(), R.layout.view_avatar, this);
initialsView = (TextView) findViewById(R.id.innerInitialsView);
imageView = (RoundedImageView) findViewById(R.id.innerImageView);
}
...
I'm trying to create a re-usable control that I can just add whereever I like with already existing controls so I need no attributes, need nothing to add.
I just want the control to show up my Visual Editor when I drag the "Custom View" to the Layout.
I have a simple view_textseek.xml as example Layout that I don't want to recreate everytime I want "Text and a Seekbar" in case I use it on 3 different places (for example: a colorpicker later). Or just a control with both a "TextView" and a "SeekBar"
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/view_textseek_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:paddingLeft="15dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:text="#string/view_textseek_text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<RelativeLayout
android:id="#+id/view_textseek_container_seekbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/view_textseek_text"
android:paddingLeft="10dp"
android:paddingTop="10dp"
android:paddingRight="10dp"
android:paddingBottom="5dp" >
<SeekBar
android:id="#+id/view_textseek_seekbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:max="255"
android:progress="0" />
</RelativeLayout>
</RelativeLayout>
and this is basically my class:
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.RelativeLayout;
public class TextSeekView extends RelativeLayout
{
public TextSeekView(Context context) { super(context); init(context); }
public TextSeekView(Context context, AttributeSet attrs) { super(context, attrs); init(context); }
public TextSeekView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context); }
protected void init(Context context)
{
if (!isInEditMode())
{
LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
layoutInflater.inflate(R.layout.view_textseek, this, true);
}
}
}
As you can see, I just want to "collect" multiple already existing controls and have one "View" or "Control" to handle these. It does not show up in the editor.
Or is this due to the some old type of idiotic bug that you have to restart your environment for "custom" Views to be loaded correctly?
And I need no special attributes on my other views, nothing at all and I just want to be able to show this layout again and again when adding it, or any other layout.
Like C#, add 3 textboxes to a control just cause you use 3 textboxes each time. Then, drag that control out on the Form whenever you want 3 textboxes - nothing more to it!
Change this code:
protected void init(Context context) {
LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
layoutInflater.inflate(R.layout.view_textseek, this, true);
if (!isInEditMode()) {
// isInEditMode returns true when you show a view on graphical editor. Returns false while showing on running app.
}
}
Sorry if this redundant with the ton of questions/answers on inflate, but I could not get a solution to my problem.
I have a compound view (LinearLayout) that has a fixed part defined in XML and additional functionalities in code. I want to dynamically add views to it.
Here is the XML part (compound.xml):
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/compoundView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView android:id="#+id/myTextView"
android:layout_width="110dp"
android:layout_height="wrap_content"
android:text="000" />
</LinearLayout>
I have defined in code a LinearLayout to refer to the XML:
public class CompoundControlClass extends LinearLayout {
public CompoundControlClass (Context context) {
super(context);
LayoutInflater li;
li = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
li.inflate(R.layout.compound_xml,*ROOT*, *ATTACH*);
}
public void addAView(){
Button dynBut = new Button();
// buttoin def+layout info stripped for brevity
addView(dynBut);
}
}
I tried to programmatically add a view with addAView.
If ROOT is null and ATTACH is false, I have the following hierarchy (per HierarchyViewer):
CompoundControlClass>dynBut
The original TextView in the XML is gone.
If ROOT is this and ATTACH is true, I have the following hierarchy:
CompoundControlClass>compoundView>myTextView
CompoundControlClass>dynBut
I would like to have
CompoundControlClass>myTextView
CompoundControlClass>dynBut
where basically the code and XML are only one unique View.
What have I grossly missed?
ANSWER BASED on feedback from D Yao ----------------------
The trick is to INCLUDE the compound component in the main layout instead of referencing it directly.
activity_main.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">
<include layout="#layout/comound"
android:id="#+id/compoundView"
android:layout_alignParentBottom="true"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>
mainActivity.java
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CompoundControlClass c = (CompoundControlClass) this.findViewById(R.id.compoundView);
c.addAView(this);
}
}
CompoundControlClass.java
public class CompoundControlClass extends LinearLayout {
public CompoundControlClass(Context context) {
super(context);
}
public CompoundControlClass(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CompoundControlClass(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void addAView(Context context){
ImageView iv = new ImageView(context);
iv.setImageResource(R.drawable.airhorn);
addView(iv);
}
}
compound.xml
<com.sounddisplaymodule.CompoundControlClass xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/compoundView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="110dp"
android:layout_height="wrap_content"
android:gravity="right"
android:textSize="40sp"
android:textStyle="bold"
android:text="0:00" />
</com.sounddisplaymodule.CompoundControlClass>
Why not just call addView on the linearlayout? I don't see the need for CompoundControlClass based on the needs you have listed.
LinearLayout v = (LinearLayout)findViewById(R.id.compoundView);
v.addView(dynBut);
In this case, v will contain myTextView, then dynBut.
if you wish to have other functions added and thus really feel a need for creating the compound control class, just leave the constructor as super(etc) and remove the rest
Then your xml would look like this:
<com.yourpackage.CompoundControlClass xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/compoundView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView android:id="#+id/myTextView"
android:layout_width="110dp"
android:layout_height="wrap_content"
android:text="000" />
</com.yourpackage.CompoundControlClass>
you will also have to ensure your CompoundControlClass.java contains the appropriate Constructor which takes both a Context and an attribute set.
Then, in your java, after you've called setContentView, you can do the following:
CompoundControlClass c = (CompoundControlClass)findViewById(R.id.compoundView);
Button b = new Button(context);
//setup b here or inflate your button with inflater
c.addView(b);
this would give you your desired heirarchy.
The documentation about this is really confusing. I simply need to add rectangels to a View I defined in my main.xml layout file. It will be a small part of the layout.
What I want to achieve is, I want to add shelves to a room but since the room shape and shelves change, I need to add them programmatically.
Below is a little part of my main.xml file, you can see the View I defined:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="#+id/relativeLayout2"
android:layout_width="600dp"
android:layout_height="650dp"
android:layout_marginTop="70dp"
android:layout_marginLeft="30dp"
android:layout_toRightOf="#+id/relativeLayout1" >
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="#string/getDirections"
android:textSize="20dp"
android:textStyle="bold" />
<View
android:id="#+id/roomplan"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/textView3"
android:layout_marginTop="40dp"
android:background="#android:color/white" />
</RelativeLayout>
This is the custom View class I created to handle dynamic changes:
public class CustomView extends View {
ShapeDrawable roomFrame;
ArrayList<ShapeDrawable> shelfFrames;
public CustomView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
#Override
protected void onDraw(Canvas canvas){
super.onDraw(canvas);
roomFrame.draw(canvas);
for (ShapeDrawable shelfFrame : shelfFrames){
shelfFrame.draw(canvas);
}
}
public void setRoom(Stage stage){
roomFrame = new ShapeDrawable(new RectShape());
roomFrame.getPaint().setColor(0xff74AC23);
roomFrame.setBounds(10, 10, stage.getWidth(), stage.getHeight());
}
public void setShelves(ArrayList<Shelf> shelves){
shelfFrames = new ArrayList<ShapeDrawable>();
for(int i = 0; i<shelves.size(); i++){
ShapeDrawable shelfFrame = new ShapeDrawable(new RectShape());
shelfFrame.getPaint().setColor(0xff74AC23);
shelfFrame.setBounds(shelves.get(i).getXPosition(), shelves.get(i).getYPosition(), shelves.get(i).getWidth(), shelves.get(i).getHeight());
shelfFrames.add(shelfFrame);
}
}
}
Now simply, when a new room plan is asked I am trying to assign this class to the View object in the xml layout:
public void loadRoomPlan(Room room, ArrayList<Shelf> shelves){
CustomView asdsView = (CustomView)findViewById(R.id.roomplan);
asdsView.setRoom(room);
asdsView.setShelves(shelves);
asdsView.invalidate();
}
I always get
Caused by: java.lang.ClassCastException: android.view.View cannot be cast to org.example.myproject.CustomView
error.
Probably I am doing this very very wrong, am I not?
The error seems to be in this line:
CustomView asdsView = (CustomView)findViewById(R.id.shopplan);
What is shopplan? In case it is a mistake and you meant R.id.roomplan try to subtitute the View in your layout for your Custom view:
<org.example.myproject.CustomView
android:id="#+id/roomplan"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/textView3"
android:layout_marginTop="40dp"
android:background="#android:color/white" />
UPDATE:
Try adding the other two constructors to your CustomView class:
public CustomView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
When you use a custom view in an xml layout, your view has to deal with the layout attributes (the constructor AttributeSet param).
I am learning to create a compound control in android.
For starters i tried an edit text with an attached button to clear it.
The problem is even though i can see the compound control in the graphical view of the
main.xml, there is an error message : "Custom view ClearableEditText is not using the 2- or 3-argument View constructors; XML attributes will not work"
This is not visible in project explorer under errors only in the xml graphical view
i am able to compile and run but get a force close.
XML : COMPOUND CONTROL clearable_edit_text.xml
<?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"
>
<EditText android:id="#+id/editText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button android:id="#+id/clearButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="CLEAR"
/>
</LinearLayout>
CLASS
public class ClearableEditText extends LinearLayout
{
EditText et;
Button btn;
public ClearableEditText(Context context)
{
super(context);
LayoutInflater li=(LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
li.inflate(R.layout.clearable_edit_text,this,true);
et=(EditText)findViewById(R.id.editText);
btn=(Button)findViewById(R.id.clearButton);
hookupButton();
}
private void hookupButton()
{
btn.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View v)
{
et.setText("");
}
});
}
}
main.xml
<?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"
>
<com.commsware.android.merge.ClearableEditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<com.commsware.android.merge.ClearableEditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
Your class extends LinearLayout but you never add any views to it. You need to call addView(...) and pass your inflated view as the parameter.
Also, to define your view in XML you need to override the 2 and 3 argument constructors for a LinearLayout. Add this to your code:
public ClearableEditText(Context context, AttributeSet attrs) {
super( context, attrs );
}
public ClearableEditText(Context context, AttributeSet attrs, int defStyle) {
super( context, attrs, defStyle );
}
To get all 3 constructors to use the same initialization code, move your code from the single argument constructor to the 3 argument constructor, then in the other 2 constructors call this(context, null, 0) and this(context, attrs, 0) respectively.