Android: Toolbar Back Button Is Transparent

Question

I Added a back button to a activity's toolbar but it looks transparent for some reason.

toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setDisplayShowHomeEnabled(true);
    toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_toolbar_back));
    toolbar.getNavigationIcon().setColorFilter(getResources().getColor(R.color.colorTitleText), PorterDuff.Mode.SRC_ATOP);
    toolbar.setNavigationOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            finish();
        }
    });

Notes: Language is Java.

android.support.v7.widget.Toolbar

android.support.v7.app.AppCompatActivity

Answer 1

Try using ContextCompat() to get color like this below code.

 toolbar.navigationIcon?.setColorFilter(ContextCompat.getColor(this, R.color.white),
                PorterDuff.Mode.SRC_ATOP)

Answer 2

I found out that the problem was not caused by my code, it was caused by Android Studio's weird Image Asset creation. While creating a image asset type toolbar icon Android Studio changes the image's alpha.

My solution is using this site and adding assets manualy.