After testing my app on Android 5.0, I noticed that image.setAlpha() is not working on this Android version.
I tried with image.setImagealpha() function, but it returns this error:
"The method setImageAlpha(int) is undefined for the type Drawable"
The API level that I´m using on my app is 8
What can I do?
Update 2019:
With kotlin now we can do it like this:
imageView.post {imageView.alpha = 1.0f}
I have used View.post so that it get updated on immediate next UI updation cycle.
Without posting on UI thread sometimes setting alpha of TextViews doesn't reflect on UI as discussed here
ImageView has the method setAlpha(float) after API 11. Before API 11 it uses setAlpha(int). Since you want to support API 8 and above, you have to specify the different states. So to resolve this, use the following code:
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB){
//For API 11 and above use a float such as 0.54.(54% transparency)
imageView.setAlpha(float);
}
else
//For API Below 11 use an int such as 54.
imageView.setAlpha(int);
Related
Using the newest version of the MPAndroidChart. Android Studio 3.6, sdk 29.
Legend legend = lineChart.getLegend();
legend.setPosition() // this is red, no such method. obviously would have a LegendPosition in it
Every other method for Legend works, just not setPosition. What am I doing wrong?
I found one user saying it was deprecated but he links to a thread from 2016, and .setPosition is in the wiki updated in Nov 2018, so I'm not sure if that's the case or not.
Edit: Using the method described by that user, I was able to get the same effect. Still curious about the state of .setPosition(), is it deprecated?
legend.setPosition is deprecated.
you should use below piece code
legend.setVerticalAlignment(Legend.LegendVerticalAlignment.BOTTOM);
legend.setHorizontalAlignment(Legend.LegendHorizontalAlignment.CENTER);
legend.setOrientation(Legend.LegendOrientation.HORIZONTAL);
legend.setDrawInside(false);
Previously, I'm using SherlockActionBar library. The following code will work, across Android 2.3 till Android 5.
this.searchMenuItem.collapseActionView();
However, after migrating to AppCompat, we need to migrate to the following code
MenuItemCompat.collapseActionView(JStockFragmentActivity.this.searchMenuItem);
When I look at the documentation http://developer.android.com/guide/topics/ui/actionbar.html#ActionView, it states that
On API level 11 or higher
Get the action view by calling getActionView() on the corresponding
MenuItem:
menu.findItem(R.id.action_search).getActionView()
I was wondering, is it necessary that I need to write my migrated code in the following way?
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
this.searchMenuItem.collapseActionView();
} else {
MenuItemCompat.collapseActionView(this.searchMenuItem);
}
I have a button that I want to set the background of using a png file from internal storage. For android api 16 and up, this works fine:
filePath = getActivity().getFileStreamPath(colorCodes.get(i-1));
temp.setBackground(Drawable.createFromPath(filePath.toString()));
When running on an android tablet with 4.0.4, this part crashes the app with a nosuchmethod error (setBackground). After a little research, I see that setBackground is only available for api 16+. After looking around on SO and a few other places, it looks like I need to use setBackgroundDrawable (deprecated) or setBackgroundResource. I tried this:
filePath = getActivity().getFileStreamPath(colorCodes.get(i-1));
if (android.os.Build.VERSION.SDK_INT < 16) {
temp.setBackgroundDrawable(Drawable.createFromPath(filePath.toString()));
} else {
temp.setBackground(Drawable.createFromPath(filePath.toString()));
}
When logging it out, it shows that setBackgroundDrawable is running and not setBackground, but I get the same nosuchmethod error (setBackground).
The other option is setBackgroundResource, but it accepts an int and not a drawable. Can I convert from drawable to int for this purpose?
What can I do here to set the background of the button to a file in internal storage for APIs < 16?
Thanks.
***EDIT - ok, this is working. just missed a little part elsewhere in the code that had the same problem. However, is using a deprecated method really the only way?
Deprecation is a status applied to a computer software feature,
characteristic, or practice indicating it should be avoided, typically
because of it being superseded. The term is also sometimes used for a
feature, design, or practice that is permitted but no longer
recommended in other areas, such as hardware design or compliance to
building codes. (source link)
Now we can answer your question.
Before API level 16 there is a method named setBackgroundDrawable. After API Level 16 google decided to write a new method setBackground for same purpose and recommend us to use new method. (Reason of this may be found by googling.)
You can use setBackgroundDrawable method for all api levels. There aren't any constraint for this. But using new method setBackground is recommended after API Level 16.
But you can only use setBackground method for devices which is running on API Level 16 or higher. So if you only implement setBackground method in your code, you are going to get MethodNotFoundException for devices which run below API Level 16.
To sum up; it is a best practice(for me it is a must) to use new methods then deprecated ones with supportted api version check such as;
if (android.os.Build.VERSION.SDK_INT < 16) {
temp.setBackgroundDrawable(Drawable.createFromPath(filePath.toString()));
} else {
temp.setBackground(Drawable.createFromPath(filePath.toString()));
}
I am not quite sure whether it is the only way to achieve this but in my opinion it is the correct one. Because the annotation #Deprecated defines the method to be superseded (in most cases) it automatically implies you can (I would even say should) use it to address older versions which are the targeted versions of this method.
In an Activity I have a code that shows this error, but only if you press save.
Call requires API level 11 (current min is 8): android.widget.SearchView#setSearchableInfo
If I change the android:minSdkVersion to 7, it works, but when I save the code again, the same error is thrown. The minSdk must then be changed back to 8,...
What is wrong?
SearchView is available since API lvl 11.
Since your minimum sdk is 8 (lower than 11), Lint will give an error when using SearchView.
You can remove that error by using #TargetApi annotation before your method or class.
But you have to make sure you use a conditional statement before using SearchView to check if it is available, and provide an alternative for earlier versions.
Here's what your code should look like:
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
void yourMethod(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
// use SearchView
} else {
// use some other backward compatible custom view
}
}
The SearchView exists in Android from the version 11 ant more.
So, if you would like to use the SearchView in your code, you have to put the minSdkVersion in your manifest to be 11. In the case you put a number smaller than 11, you will get an error, which is normal beause you are giving access to your app to some android versions which will not support your app.
This can be seen (thanks to #JesseJ) here: http://developer.android.com/reference/android/widget/SearchView.html
Added in API level 11
I want to get current alpha of textview i am using the following code but i am getting an error that
java.lang.NoSuchMethodError: android.widget.TextView.getAlpha
Please guide me.
This method since API Level 11. Check your API version.
View.getAlpha() only exists since API level 11. You are trying to running your code on a too-old version of Android.
If you absolutely require this functionality, then update your app's minSdkVersion in AndroidManifest.xml to prevent it running on older Android versions. If you can live without it, do a runtime check to see if the API level is high enough.
you can use Alpha method like below
Textview tv_password;
tv_password =(TextView) findviewById(R.id.tv1);
tv_password.getBackground().setAlpha(50);
you can't use getAlpha() method with Textview
View.getAlpha() available from API level 11.But if you want to use this on older api then you may use NineOldAndroids library available for using the Honeycomb (Android 3.0) animation API on all versions of the platform back to 1.0!
So use need to change for e.g.
mAlpha = mView.getAlpha();
to
mAlpha = ViewHelper.getAlpha(mView);
where mView is your view.
Note : Don't forget to import com.nineoldandroids.view.ViewHelper;