Floating button in Android

Floating button là một trong những control view khá thông dụng trong một số ứng dụng.

Step 1: Tạo layout màn hình chính như sau:

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginEnd="@dimen/fab_margin"
        android:layout_marginBottom="16dp"
        app:srcCompat="@android:drawable/ic_dialog_email" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

Step 2: Trong file code java như sau:

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private FloatingActionButton btnFloatingButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initialView();
    }

    private void initialView(){
        btnFloatingButton = findViewById(R.id.fab);
        btnFloatingButton.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.fab:
                Snackbar.make(v, "Replace with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show();
                break;
        }
    }
}

Step 3: Kết quả

   

Eng Sub: