If you want to see more algorithm questions, you can scan the QR code above to follow my WeChat official account " Data Structure and Algorithms ". Up to now, I have updated more than 500 algorithm questions in the official account , some of which have been sorted into pdf documents. , As of now, there are more than 800 pages in total (and will continue to increase), you can reply to the keyword "pdf" in the official account to download.
Button has a default height in Android, if you want to remove it, you can add the following line of code
android:minHeight="0dp"