用片段布局替换活动布局

Question

I have an activity, in that mail layout I have button on click of that button I want to replace the entire activity layout with my fragment layout

how can I do this.?

Answer 1

Simplest way to replace your Activity layout is to create a Container Parent layout and set as the content to the Activity and then add the Fragment to the container Layout

 // create a frame layout
 FrameLayout fragmentLayout = new FrameLayout(this);
 // set the layout params to fill the activity 
 fragmentLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
 // set an id to the layout
 fragmentLayout.setId(1000); // some positive integer
 // set the layout as Activity content
 setContentView(fragmentLayout);
 // Finally , add the fragment
  getSupportFragmentManager()
        .beginTransaction()
        .add(1000,new TestFragment()).commit();  // 1000 - is the id set for the container layout

Answer 2

Using the reference of Libin's answer : His answer gives the following error: Expected Resource of type ID . Hence follow the following procedure

Create a resource file in values called ids

<resources>
    <item name="fragmentLayout" type="id"/>
</resources>

Use this id to reference the id of the layout.

// create a frame layout
FrameLayout fragmentLayout = new FrameLayout(this);
// set the layout params to fill the activity 
fragmentLayout.setLayoutParams(new  ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
// set an id to the layout
fragmentLayout.setId(R.id.fragmentLayout); // some positive integer
// set the layout as Activity content
setContentView(fragmentLayout);
// Finally , add the fragment
getSupportFragmentManager().beginTransaction().add(R.id.fragmentLayout,new TestFragment()).commit(); 

Another method to get id for a generated layout is fragmentLayout.setId(View.getGeneratedId()); . But it is problematic to access the id of the fragment outside the activity using this method. Hence, I would recommend the above method.

Answer 3

Assuming your Activity layout looks something like:

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</FrameLayout>

You can replace the contents of the FrameLayout with your Fragment :

getFragmentManager()
        .beginTransaction()
        .replace(R.id.container, fragment)
        .commit();

If you want to be able to press 'back' to remove the fragment, add addToBackStack(null) to the FragmentTransaction . See the docs for more details.