Android首次设置警告变成错误

Question

So i wanted to dive into some android development but i seem to be running into a problem that google doesn't seem to have answers too.

First up here is the Hello World tutorial i'm following. ( https://developer.android.com/training/basics/firstapp/ )

So i managed to send the default package to my phone with the Hello World MainActivity but once i try to add some UI elements (and contain them) I get 1 error and 1 warning when i try to compile it. WARNING: ABIs [arm64-v8a,armeabi-v7a,armeabi] set by android.injected.build.abi gradle flag contained 'ARMEABI' not targeted by this project.

After messing around with the packages, uninstalling all my other coding software and restarting my PC a few times i noticed when i would start a new project i would have a warning straight away, With my MainActivity.java

L20 TextView tv = (TextView) findViewById(R.id.sample_text);

Warning: Cannot resolve symbol 'sample_text' / Casting 'findViewById(R.id.sample_text)' to 'TextView' is redundant.

I've tried reinstalling the SDK and installing all the packages but i'm not to sure and am almost ready to give up sadly so any help will be GREATLY appreciated.

Answer 1

Hello i have found two helpful links to your answer for The first question ie

WARNING: ABIs [arm64-v8a,armeabi-v7a,armeabi] set by 'android.injected.build.abi' gradle flag contained 'ARMEABI' not targeted by this project. here is most helpful link WARNING: ABIs [armeabi-v7a,armeabi] set by 'android.injected.build.abi' gradle flag contained 'ARMEABI' not targeted by this project

for the second one TextView tv = (TextView) findViewById(R.id.sample_text); Warning: Cannot resolve symbol 'sample_text' / Casting 'findViewById(R.id.sample_text)' to 'TextView' is redundant.

one is warning of casting TextView ie (TextView) this doesn't have any problem on compilation and its not finding text view by id of sample_text so check id of your textview field from xml file. If its there the problem is its not compiling and it will be solved when you take over the warning.

Answer 2

enter code like this the warning will disappear enter code here

TextView tv = findViewById(R.id.sample_text);