mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mProgressBar.setVisibility(View.GONE);
                iv.setVisibility(View.VISIBLE);
            }
        }, 2500);

public class MainActivity extends AppCompatActivity {

    private Handler mHandler = new Handler();
    private SplashFragment splashFragment;
    private ViewStub viewStub;

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

        splashFragment = new SplashFragment();
        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.frame, splashFragment);
        transaction.commit();

        /**
         *這么寫不好判斷視圖有沒有加載完
         */
        //      mHandler.postDelayed(new Runnable() {
//          @Override
//          public void run() {
//              mProgressBar.setVisibility(View.GONE);
//              iv.setVisibility(View.VISIBLE);
//          }
//      }, 2500);

        viewStub = (ViewStub) findViewById(R.id.content_viewstub);

        //1.判斷當(dāng)窗體加載完畢的時候,立馬再加載真正的布局進(jìn)來
        getWindow().getDecorView().post(new Runnable() {

            @Override
            public void run() {
                // 開啟延遲加載
                mHandler.post(new Runnable() {

                    @Override
                    public void run() {
                        //將viewstub加載進(jìn)來
                        viewStub.inflate();
                    }
                });
            }
        });

        //2.判斷當(dāng)窗體加載完畢的時候執(zhí)行,延遲一段時間做動畫。
        getWindow().getDecorView().post(new Runnable() {
            @Override
            public void run() {
                // 開啟延遲加載,也可以不用延遲可以立馬執(zhí)行（我這里延遲是為了實現(xiàn)fragment里面的動畫效果的耗時）
                mHandler.postDelayed(new DelayRunnable(MainActivity.this, splashFragment), 2000);
            }
        });

    //3.同時進(jìn)行異步加載數(shù)據(jù)
        //......
    }
    

    static class DelayRunnable implements Runnable {

        private WeakReference<Context> contextWeakReference;
        private WeakReference<SplashFragment> splashFragmentWeakReference;

        public DelayRunnable(Context context, SplashFragment f) {
            contextWeakReference = new WeakReference<Context>(context);
            splashFragmentWeakReference = new WeakReference<SplashFragment>(f);
        }

        @Override
        public void run() {
            //移除Fragment
            if (contextWeakReference != null) {
                SplashFragment splashFragment = splashFragmentWeakReference.get();
                if (splashFragment == null) {
                    return;
                }
                FragmentActivity activity = (FragmentActivity) contextWeakReference.get();
                FragmentTransaction transaction = activity.getSupportFragmentManager().beginTransaction();
                transaction.remove(splashFragment);
                transaction.commit();
            }

        }
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   >

    <ViewStub 
        android:id="@+id/content_viewstub"
        android:layout="@layout/activity_main_viewstub"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <FrameLayout
        android:id="@+id/frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>

</RelativeLayout>