setBackground vs setBackgroundDrawable (Android) - android

I want to set background drawable of a view. There are two methods for this (as far as I see): setBackground and setBackgroundDrawable.
When I use setBackground, it says it has been added in API level 16 but my project's min SDK version is 7. I assume it's not going to work on anything below 16, am I right? But when I use setBackgroundDrawable, it says it's deprecated.
What am I supposed to use?

It's deprecated but it still works so you could just use it. But if you want to be completly correct, just for the completeness of it... You'd do something like following:
int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
setBackgroundDrawable();
} else {
setBackground();
}
For this to work you need to set buildTarget api 16 and min build to 7 or something similar.

You can use setBackgroundResource() instead which is in API level 1.

seems that currently there is no difference between the 2 functions, as shown on the source code (credit to this post) :
public void setBackground(Drawable background) {
//noinspection deprecation
setBackgroundDrawable(background);
}
#Deprecated
public void setBackgroundDrawable(Drawable background) { ... }
so it's just a naming decision, similar to the one with fill-parent vs match-parent .

i know this is an old question but i have a similar situation ,and my solution was
button.setBackgroundResource( R.drawable.ic_button );
Drawable d = button.getBackground();
and then you can play with the "Drawable", applying color filters, etc

Use ViewCompat.setBackground(view, background);

you could use setBackgroundResource() instead i.e. relativeLayout.setBackgroundResource(R.drawable.back);
this works for me.

Using Android studio 1.5.1 i got the following warnings:
Call requires API level 16 (current min is 9): android.view.View#setBackground
and the complaints about deprecation
'setBackgroundDrawable(android.graphics.drawable.Drawable)' is deprecated
Using this format, i got rid of both:
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN) {
//noinspection deprecation
layout.setBackgroundDrawable(drawable);
} else {
layout.setBackground(drawable);
}

Now you can use either of those options. And it is going to work in any case.
Your color can be a HEX code, like this:
myView.setBackgroundResource(ContextCompat.getColor(context, Color.parseColor("#FFFFFF")));
A color resource, like this:
myView.setBackgroundResource(ContextCompat.getColor(context,R.color.blue_background));
Or a custom xml resource, like so:
myView.setBackgroundResource(R.drawable.my_custom_background);
Hope it helps!

This works for me: View view is your editText, spinner...etc. And int drawable is your drawable route example (R.drawable.yourDrawable)
public void verifyDrawable (View view, int drawable){
int sdk = Build.VERSION.SDK_INT;
if(sdk < Build.VERSION_CODES.JELLY_BEAN) {
view.setBackgroundDrawable(
ContextCompat.getDrawable(getContext(),drawable));
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
view.setBackground(getResources().getDrawable(drawable));
}
}

Use setBackgroundResource(R.drawable.xml/png)

I also had this problem, but I made a workaround using a ImageView.
Try using a RelativeLayout and add a ImageView inside it (width and height: fill_parent, scaleType: center).
Also make sure the imageview is the first element inside the RelativeLayout, so it will act as background.

You can also do this:
try {
myView.getClass().getMethod(android.os.Build.VERSION.SDK_INT >= 16 ? "setBackground" : "setBackgroundDrawable", Drawable.class).invoke(myView, myBackgroundDrawable);
} catch (Exception ex) {
// do nothing
}
EDIT: Just as pointed out by #BlazejCzapp it is preferable to avoid using reflection if you can manage to solve the problem without it. I had a use case where I was unable to solve without reflection but that is not case above. For more information please take a look at http://docs.oracle.com/javase/tutorial/reflect/index.html

Related

Button setTextAppearance is deprecated

Button setTextAppearance(Context context, int resid) is deprecated
and setTextAppearance(int resid) - only available for API level 23
What should I use instead?
Deprecated means that support will be dropped for it sometimes in the future, but it is still working as expected. On older APIs, there is no alternative, since the new setTextAppearance(int resid) got only released with API level 23.
If you want to be safe for a long time, you can use the following code:
if (Build.VERSION.SDK_INT < 23) {
yourButton.setTextAppearance(context, resid);
} else {
yourButton.setTextAppearance(resid);
}
This code prefers the new version on phones with API level 23 or higher, but uses the old one when the API level 23 one isn't available.
I am going to say the same this as #Daniel Zolnai. But do not make the check Build.VERSION>SDK_INT < 23 in all the places in your code. Put this in one place, so it will be easy for you to remove this in the future or make changes to it. So how to do it? I will do this for the yourButton case.
Never use Button or any other view provided by android just like that. I say this, because in the future you will need to tweak something and hence it's better to have your own MyButton or something of that sort. So create MyButton extends Button.
Inside MyButton, put the below code:
public void setTextAppearance(Context context, int resId) {
if (Build.VERSION.SDK_INT < 23) {
super.setTextAppearance(context, resId);
} else {
super.setTextAppearance(resId);
}
}
This way you can always use setTextAppearance without needing to worry about checking for BUILD versions. If in future, you plan to remove this whole thing, then you have to refactor in just one place. This is a bit of work, but in the long run, this will help you a lot and will reduce some maintanance nightmares.

setBackgroundDrawable() deprecated

So my sdk goes from 15 to 21 and when I call setBackgroundDrawable(), Android Studio tells me that it's deprecated.
I thought of going around it using:
int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
layout.setBackgroundDrawable(getResources().getDrawable(R.drawable.img_wstat_tstorm));
} else {
layout.setBackground(getResources().getDrawable(R.drawable.img_wstat_tstorm));
}
But then, I get an error at "setBackground()".
So, how would you deal with it?
It's an interesting topic. The way you are doing it is correct, apparently. It is actually just a naming decision change. As this answer points out, setBackground() just calls setBackgroundDrawable():
public void setBackground(Drawable background) {
//noinspection deprecation
setBackgroundDrawable(background);
}
#Deprecated
public void setBackgroundDrawable(Drawable background) { ... }
You can see this thread for more information about all of this.
maybe you can try the following:
setBackgroundResource(R.drawable.img_wstat_tstorm);
Correct as of 15th August 2018
Use the support libraries
Drawable drawable = ResourcesCompat.getDrawable(getResources(), drawableRes, null);
ViewCompat.setBackground(layout, drawable);
It's funny because that method is deprecated, but if you look at the Android Source Code you'll find this:
/**
* Set the background to a given Drawable, or remove the background. If the
* background has padding, this View's padding is set to the background's
* padding. However, when a background is removed, this View's padding isn't
* touched. If setting the padding is desired, please use
* {#link #setPadding(int, int, int, int)}.
*
* #param background The Drawable to use as the background, or null to remove the
* background
*/
public void setBackground(Drawable background) {
//noinspection deprecation
setBackgroundDrawable(background);
}
You are getting an error because getResources().getDrawable() takes an id (int) not a drawable as its argument. Try this:
layout.setBackground(getResources().getDrawable(R.id.img_wstat_tstorm));
//Java
view.setBackground(ActivityCompat.getDrawable(context, R.drawable.bg))
//Kotlin
view.background = ActivityCompat.getDrawable(context, R.drawable.bg)
Use this:
myView.background = ContextCompat.getDrawable(context, R.id.my_drawable)
This is correct in my case
Solve this problem
imageView.setBackgroundResource(images[productItem.getPosition()]);
Correct as of 23th November 2018
Kotlin:
view.background = resources.getDrawable(R.drawable.ic_image,theme)
If you include the Theme parameter.
I'm using a minSdkVersion 16 and targetSdkVersion 23
The following is working for me, it uses
ContextCompat.getDrawable(context, R.drawable.drawable);
Instead of using: layout.setBackground(getResources().getDrawable(R.drawable.img_wstat_tstorm));
Rather use:
layout.setBackground(ContextCompat.getDrawable(getActivity(), R.drawable.img_wstat_tstorm));
getActivity() is used in a fragment, if calling from a activity use this
BitmapDrawable background = new BitmapDrawable(BitmapFactory.decodeResource(getResources(), R.mipmap.Nome_imgem));
getSupportActionBar().setBackgroundDrawable(background);

Call requests min level of 16

I want to change the background of my framelayout (which holds all my pages!) by:
FrameLayout fl = (FrameLayout)findViewById(R.id.container);
fl.setBackground(getResources().getDrawable(R.drawable.juraquiz_app_background));
but apparently I cant. Is there a way to do it, so its compatible with APIs lower than 16?
for API's lower that 16 you can use setBackgroundDrawable
Use different methods for different APIs:
final Drawable drw = getResources().getDrawable(R.drawable.juraquiz_app_background);
if(android.os.Build.VERSION.SDK_INT < 16)
{
fl.setBackgroundDrawable(drw);
}
else
{
fl.setBackground(drw);
}
You will need to add an annotation to your method (or to your class, if you prefer) to get rid of Lint warnings:
#SuppressLint("NewApi")

how to set background xml file in drawable for a view?

how can I set an xml background file that placed in drawable for a view without using #SuppressLint("NewApi") ?
for example I created a drawable xml file for my textview
when I call TV.setBackground(getResources().getDrawable(R.drawable.tv_pic_back)); eclipse automatically add #SuppressLint("NewApi") at the first of my function.
how can I use that without #SuppressLint("NewApi") ?
I have a class where I put a lot of code to handle the different APIs, so that you use one line of code for one API, and another line of code for another API.
public static void setBackgroundDrawable(View view, Drawable drawable) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
view.setBackground(drawable);
}
else {
view.setBackgroundDrawable(drawable);
}
}
This will still give you a warning because setBackgroundDrawable is deprecated, but if you instead would use setBackground(drawable) for all versions then your application would crash on API levels lower than Jelly Bean (API 16).
However, in your case all you need to do is actually setBackgroundResource(R.drawable.tv_pic_back); because you don't need to get the drawable from the resource id yourself, Android will do that for you if you give it your resource id when you call the right method.
The Android developer reference will tell you which methods are deprecated and which methods are implemented in which API version.

How to turn off CalendarView in a DatePicker?

On my settings screen I have a date picker widget. In the designer in Eclipse, it shows as I want (3 spinners for D-M-Y) but when I test on my device, I get a rather odd view with a side spinner on the left and a calendar on the right. Never seen this before(!) but doing some research I think I'm seeing the "CalendarView".
I found that I should be able to set a "calendarViewShown" property to false- but my XML throws an error with this. I found another question on here that suggested the API level was to blame (my minSDKLevel is 7, but I'm targetting 11 so I can get the action bar button rather than the oldskool menu).
So I thought I'd try setting it in code:
int currentapiVersion = android.os.Build.VERSION.SDK_INT;
if (currentapiVersion >= 11)
minDateSelector.setCalendarViewShown = false;
But again, this fails- setCalendarViewShown isn't found. But the docs here say it should exist.
Any ideas?!
If you are targeting a later version of the API, you can use the following XML (no need to write Java code) in your <DatePicker>:
android:calendarViewShown="false"
The method in DatePicker
public void setCalendarViewShown (boolean shown)
exists starting with API 11. If you minSdkLevel = 7 the compiler does not recognize this as a valid method - the method does not exist on android 2.3 or 2.2. The best way is to solve this is using reflection. Something like this should work properly:
int currentapiVersion = android.os.Build.VERSION.SDK_INT;
if (currentapiVersion >= 11) {
try {
Method m = minDateSelector.getClass().getMethod("setCalendarViewShown", boolean.class);
m.invoke(minDateSelector, false);
}
catch (Exception e) {} // eat exception in our case
}
I made it work with the following XML configuration:
android:datePickerMode="spinner"
android:calendarViewShown="false"
Only the following configuration didn't work for me:
android:calendarViewShown="false"
In those cases I use
import android.os.Build;
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void someThing() {
[...]
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
minDateSelector.setCalendarViewShown(false);
}
}
I think the readability is better than using reflection and the style is better than catch and ignore exceptions. Of course the reflection thing is also working.
I had the same problem as you, I couldn't make the change appear via XML.
You are on the right track, try changing your last line to:
minDateSelector.setCalendarViewShown(false);

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