两个片段之间过渡的圆形进度条

Question

我创建了一个包含片段的导航抽屉，每个片段需要几次加载。 所以我想在过渡期间实现一个圆形进度条，如下面的 gmail 应用程序：screenshot gmail app

Main 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();
}