每当我点击Receive消息时，它就会转到ReceivedFragment，它可以工作，但问题是Mainactivity与ReceivedFragment重叠，正如您在下面的图像中看到的，我已经尝试删除framelayout中的所有视图，但结果总是一样，有人能帮我吗？ 我是安卓新手，下面是我现在的代码，谢谢

MainActivty.java

           @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            switch (i) {
                case 0:
                    break;

                case 1:
                    ReceivedFragment dashfragment = new ReceivedFragment();
                    FrameLayout fl = (FrameLayout) findViewById(R.id.frame_layout);
                    fl.removeAllViews();
                    FragmentTransaction transaction1 =getSupportFragmentManager().beginTransaction();
                    transaction1.add(R.id.frame_layout, dashfragment);
                    transaction1.commit();
                    break;
                    //case - so on and so on

我的Activity.xml

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

<ListView
    android:id="@+id/listView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/frame_layout" />
</RelativeLayout >