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When is the Activity root view inflated?

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4

The docs for the setContentView() method in the Activity class state that the view is added to the activity window AND inflated. However, the width and height of the root view are both zero after setContentView() is called.

Example below:

Activity class

public class MainActivity extends AppCompatActivity 

 private static final String TAG = "myTag";

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

 View root = ((ViewGroup) this.findViewById(android.R.id.content)).getChildAt(0);
 // Here I expect the root view to have been inflated and have a width and height
 Log.i(TAG, "Root view width:" + root.getWidth() + " height:" + root.getHeight());
 

Layout XML

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
 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">

 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"
 android:layout_gravity="center_horizontal|center_vertical" />

</FrameLayout>

My problem is I need to create a bitmap image of the root view upon the launch of the activity and I'm not sure when I should do this that guarantees the root view has been inflated.

android android-view

share|improve this question

edited Mar 22 at 18:53

Onik

11.8k104264

asked Mar 22 at 16:35

chipschips

888

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Why does calling getWidth() on a View in onResume() return 0?
  
  – Onik
  Mar 22 at 17:34
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Why does calling getWidth() on a View in onResume() return 0?
  
  – Taslim Oseni
  Mar 22 at 18:47
  

  
  
  
  

add a comment | 

4

The docs for the setContentView() method in the Activity class state that the view is added to the activity window AND inflated. However, the width and height of the root view are both zero after setContentView() is called.

Example below:

Activity class

public class MainActivity extends AppCompatActivity 

 private static final String TAG = "myTag";

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

 View root = ((ViewGroup) this.findViewById(android.R.id.content)).getChildAt(0);
 // Here I expect the root view to have been inflated and have a width and height
 Log.i(TAG, "Root view width:" + root.getWidth() + " height:" + root.getHeight());
 

Layout XML

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
 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">

 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"
 android:layout_gravity="center_horizontal|center_vertical" />

</FrameLayout>

My problem is I need to create a bitmap image of the root view upon the launch of the activity and I'm not sure when I should do this that guarantees the root view has been inflated.

android android-view

share|improve this question

edited Mar 22 at 18:53

Onik

11.8k104264

asked Mar 22 at 16:35

chipschips

888

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Why does calling getWidth() on a View in onResume() return 0?
  
  – Onik
  Mar 22 at 17:34
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Why does calling getWidth() on a View in onResume() return 0?
  
  – Taslim Oseni
  Mar 22 at 18:47
  

  
  
  
  

add a comment | 

The docs for the setContentView() method in the Activity class state that the view is added to the activity window AND inflated. However, the width and height of the root view are both zero after setContentView() is called.

Example below:

Activity class

public class MainActivity extends AppCompatActivity 

 private static final String TAG = "myTag";

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

 View root = ((ViewGroup) this.findViewById(android.R.id.content)).getChildAt(0);
 // Here I expect the root view to have been inflated and have a width and height
 Log.i(TAG, "Root view width:" + root.getWidth() + " height:" + root.getHeight());
 

Layout XML

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
 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">

 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"
 android:layout_gravity="center_horizontal|center_vertical" />

</FrameLayout>

My problem is I need to create a bitmap image of the root view upon the launch of the activity and I'm not sure when I should do this that guarantees the root view has been inflated.

android android-view

share|improve this question

edited Mar 22 at 18:53

Onik

11.8k104264

asked Mar 22 at 16:35

chipschips

888

public class MainActivity extends AppCompatActivity 

 private static final String TAG = "myTag";

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

 View root = ((ViewGroup) this.findViewById(android.R.id.content)).getChildAt(0);
 // Here I expect the root view to have been inflated and have a width and height
 Log.i(TAG, "Root view width:" + root.getWidth() + " height:" + root.getHeight());
 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
 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">

 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Hello World!"
 android:layout_gravity="center_horizontal|center_vertical" />

</FrameLayout>

android android-view

android android-view

share|improve this question

edited Mar 22 at 18:53

Onik

11.8k104264

asked Mar 22 at 16:35

chipschips

888

share|improve this question

edited Mar 22 at 18:53

Onik

11.8k104264

asked Mar 22 at 16:35

chipschips

888

edited Mar 22 at 18:53

Onik

11.8k104264

edited Mar 22 at 18:53

Onik

11.8k104264

asked Mar 22 at 16:35

chipschips

888

asked Mar 22 at 16:35

chipschips

888

1 Answer
1

active

oldest

votes

3

As @Onik correctly commented, he has already answered my question here Why does calling getWidth() on a View in onResume() return 0?

I would add that you could also attach an addOnLayoutChangeListener to your view and remove it in onLayoutChange(). It's ugly, but seems to be the only way;

share|improve this answer

edited Mar 22 at 18:53

Onik

11.8k104264

answered Mar 22 at 18:10

chipschips

888

add a comment | 

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3

As @Onik correctly commented, he has already answered my question here Why does calling getWidth() on a View in onResume() return 0?

I would add that you could also attach an addOnLayoutChangeListener to your view and remove it in onLayoutChange(). It's ugly, but seems to be the only way;

share|improve this answer

edited Mar 22 at 18:53

Onik

11.8k104264

answered Mar 22 at 18:10

chipschips

888

add a comment | 

3

As @Onik correctly commented, he has already answered my question here Why does calling getWidth() on a View in onResume() return 0?

I would add that you could also attach an addOnLayoutChangeListener to your view and remove it in onLayoutChange(). It's ugly, but seems to be the only way;

share|improve this answer

edited Mar 22 at 18:53

Onik

11.8k104264

answered Mar 22 at 18:10

chipschips

888

add a comment | 

As @Onik correctly commented, he has already answered my question here Why does calling getWidth() on a View in onResume() return 0?

I would add that you could also attach an addOnLayoutChangeListener to your view and remove it in onLayoutChange(). It's ugly, but seems to be the only way;

share|improve this answer

edited Mar 22 at 18:53

Onik

11.8k104264

answered Mar 22 at 18:10

chipschips

888

share|improve this answer

edited Mar 22 at 18:53

Onik

11.8k104264

answered Mar 22 at 18:10

chipschips

888

edited Mar 22 at 18:53

Onik

11.8k104264

edited Mar 22 at 18:53

Onik

11.8k104264

answered Mar 22 at 18:10

chipschips

888

answered Mar 22 at 18:10

chipschips

888