Using the following code:
public class CustomView extends RelativeLayout {
public CustomView(Context context) {
this(context, null, 0);
}
public CustomView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CustomView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView();
}
private void initView() {
inflate(getContext(), R.layout.custom_view, this);
}
}
The layout is simple:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/custom_view_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f00"/>
The hierarchyviewer shows the following:
The CustomView hierarchy is useless and I would like to remove it.
Is there a way to create a custom view extending a ViewGroup without adding that additional View?
If your CustomView is already a RelativeLayout in you XML layout you can just delete the RelativeLayout with "#+id/custom_view_id" and use as father the tag
That will merge the children with the CustomView without using an extra RelativeLayout.
The CustomView will setBackgroundColor
public class CustomView extends RelativeLayout {
public CustomView(Context context) {
this(context, null, 0);
}
public CustomView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CustomView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView();
}
private void initView() {
setBackgroundColor(Color.parseColor("#f00"));
inflate(getContext(), R.layout.custom_view, this);
}}
and the layout xml file will be:
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<!-- children here -->
</merge>
Related
i created simple widget as custom checkBox as this below code, in this code setting custom font work fine but i can't check or uncheck CheckBox
public class CustomFontCheckBox extends AppCompatCheckBox {
public CustomFontCheckBox(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setTypeface(FontManager.getInstance(getContext()).loadFont("fonts/my_font.ttf"));
}
public CustomFontCheckBox(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
#SuppressWarnings("unused")
private void internalInit(Context context, AttributeSet attrs) {
}
}
xml layout:
<com.myapp.test.Widgets.CustomFontCheckBox
android:id="#+id/ch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="#dimen/sickness_depth_marginRight"
android:button="#null"
android:buttonTint="#color/colorAccent"
android:drawableRight="?android:attr/listChoiceIndicatorMultiple"
android:text="#string/diabetes"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#color/body_text_color"/>
Well I think you are messing with its constructor and its style use it like this
public class CustomFontCheckBox extends AppCompatCheckBox {
public CustomFontCheckBox(Context context) {
super(context);
init();
}
public CustomFontCheckBox(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CustomFontCheckBox(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init(){
//set your typeface here.
// setTypeface("");
}
}
I created a custom view with the following code :
public class TestView extends LinearLayout {
public TestView(Context context) {
this(context, null);
}
public TestView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TestView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView(context);
}
private void initView(Context context) {
LayoutInflater.from(context).inflate(R.layout.layout_test, this);
setBackgroundResource(R.color.black);
}
}
layout_test.xml :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"/>
It works well, background is black.
But once I added background attribute to xml, setBackgroundResource
not work anymore(layout_test.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:background="#color/white"/>
activity_layout:
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TestView
android:id="#+id/testView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
github.com/MummyDing/TestView
try this.
public class TestView extends LinearLayout {
public TestView(Context context) {
this(context, null);
setBackgroundResource(R.color.black);
}
public TestView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TestView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView(context);
}
private void initView(Context context) {
LayoutInflater.from(context).inflate(R.layout.layout_test, this);
}
}
try to use with the help of context
LayoutInflater.from(context).inflate(R.layout.layout_test, this).
setBackgroundColor(context.getResources().getColor(R.color.colorAccent));
Try using an id like:
LinearLayout lLayout = (LinearLayout) findViewById(R.layout.my_linear_id);
lLayout.setBackgroundColor(context.getResources().getColor(R.color.green_color));
where my_linear_id is the id of you LinearLayout
What is correct way to extend EditText?
The problem is following:
I have empty application from template with two EditText:
<?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">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="one"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="two"/>
</LinearLayout>
It works fine:
Then I create my custom view from EditText:
public class CuteEditText extends EditText {
public CuteEditText(Context context) {
this(context, null);
}
public CuteEditText(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CuteEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
// some special initialization will be here
}
}
And when I change EditText to my CuteEditText, interface works incorrectly:
The problem is not only with view ot UI. If I type something in first EditText and than touch the second one, nohing happens: input will continue in first.
The same behaviour if I inherite CuteEditText from AppCompatEditText.
What is wrong?
Sources for experiment are available at https://github.com/tseglevskiy/EditTextExperiment
Your construtors are broken. This is how it should look:
public class CuteEditText extends EditText {
public CuteEditText(Context context) {
super(context);
}
public CuteEditText(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CuteEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
}
You don't need the third constructor overload. The first one is for creating the view programmatically and the second one is for creating the view from xml. Those two should be enough for most cases.
public class CuteEditText extends EditText {
public CuteEditText(Context context) {
this(context, null);
}
public CuteEditText(Context context, AttributeSet attrs) {
super(context, attrs);
}
}
I need every instance of a custom Button to use a FrameLayout as it's layout. How do I do this from my custom Button class, as to avoid having to wrap every xml defined CustomButton in a FrameLayout?
public CustomButton(Context context) {
super(context);
init(context);
}
public CustomButton(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public CustomButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
//this doesn't work...
FrameLayout layout = new FrameLayout(context);
inflate(context, R.layout.frame_layout, null);
}
just put your FrameLayout arount your Custom button in frame_layout and later in other xml you can put it in as and this view will be as it is in frame_layout
I'm trying something like this
public class CustomViewSubclass extends HorizontalScrollView{
private LinearLayout layout;
public CustomViewSubclass(Context context) {
this(context,null,0);
}
public CustomViewSubclass(Context context, AttributeSet attrs) {
this(context,attr,0);
}
public CustomViewSubclass(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
layout = new LinearLayout(context);
}
// This is called from the `Activity`
public void startAsyncTask() { // code }
// This method is called in the `onPostExecute()` of an `AsyncTask` subclass
public void doSomething(Context context) {
ImageView image = ImageView(context);
layout.addView(image); // NullPointerException here, layout seems to be null
}
but it seems that layout on doSomething() is null. How is that even possible? I'm initializing it on the constructor... and I never re-initialize it again;
I'm adding my custom view via XML
<com.mypackage.CustomViewSubclass
android:layout_width="wrap_content"
android:layout_width="match_parent" />
Ok I fixed it, it was an stupid mistake made by me:
I used super() on the 3 methods, instead of using this().
public CustomViewSubclass(Context context) {
super(context,null,0);
}
public CustomViewSubclass(Context context, AttributeSet attrs) {
super(context,attr,0);
}
public CustomViewSubclass(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
layout = new LinearLayout(context);
}
Solution:
public CustomViewSubclass(Context context) {
this(context,null,0);
}
public CustomViewSubclass(Context context, AttributeSet attrs) {
this(context,attr,0);
}
public CustomViewSubclass(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
layout = new LinearLayout(context);
}