GridLayout approach the question of error in addView

Android GridLayout

Today, try to use a little GridLayout, but when they use addView reported a mistake
Who knows what the problem is look at the help, the code is very simple as

 
GridLayout gridLayout = null; 

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

gridLayout = (GridLayout) findViewById (R.layout.activity_main); 
View view = View.inflate (this, R.layout.item, null); 
ImageView image = (ImageView) view.findViewById (R.id.image); 
image.setBackgroundResource (R.drawable.ic_launcher); 

gridLayout.addView (view); 
} 

Configuration file as follows

 

xmlns: tools = "http://schemas.android.com/tools" 
android: id = "@ + id/GridLayout1" 
android: layout_width = "match_parent" 
android: layout_height = "match_parent" 
android: paddingBottom = "@ dimen / activity_vertical_margin" 
android: paddingLeft = "@ dimen / activity_horizontal_margin" 
android: paddingRight = "@ dimen / activity_horizontal_margin" 
android: paddingTop = "@ dimen / activity_vertical_margin" 
android: rowCount = "4" 
android: columnCount = "4" 
> 


 

Log information is as follows:

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Reply:
gridLayout = (GridLayout) findViewById (R.layout.activity_main);

= "

gridLayout = (GridLayout) findViewById (R.id.GridLayout1);
Reply:

cited a floor hjywyj reply:

gridLayout = (GridLayout) findViewById (R.layout.activity_main);

= "

gridLayout = (GridLayout) findViewById (R.id.GridLayout1);

Well, I 2, thank you