圓形進度條在兩個片段之間轉換

Question

我創建一個包含片段的導航抽屜，每個片段需要幾次加載。 所以我要像下面的Gmail應用程序在過渡期間實現了一圈進度條：screenshot gmail app

主要Activity.class

public boolean onNavigationItemSelected(MenuItem item) { 

    int id = item.getItemId(); 
    if (id == R.id.profil) { 

    } 
    else if (id == R.id.accueil) { 

     AccueilFragment fragment = new AccueilFragment(); 
     android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
     fragmentTransaction.replace(R.id.fragment1, fragment); 
     fragmentTransaction.commit(); 
     floatingActionButton.show(); 
     getSupportActionBar().setTitle("Accueil"); 


    } else if (id == R.id.categories) { 
     CategoriesFragment fragment = new CategoriesFragment(); 
     android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
     fragmentTransaction.replace(R.id.fragment1, fragment); 
     fragmentTransaction.commit(); 
     floatingActionButton.hide(); 
     getSupportActionBar().setTitle("Categories"); 


    } 
} 

Answer 1

private ProgressDialog mProgressDialog; 

mProgressDialog = new ProgressDialog(this); 

mProgressDialog.setMessage("Working ..."); 

private void doSomeWorkMethod() { 

    mProgressDialog.show(); 

    doSomeWork . . . 

    mProgressDialog.dismiss(); 

    Snackbar.make(v, "Work Complete.", Snackbar.LENGTH_LONG) 
     .setAction("Action", null).show(); 
}