Android onKey Operation Method

In the Android operating system, if you want to perform specific operations on a control, You Need To trigger the corresponding event. For example, the Android onKey event is triggered. Here we will give you a detailed introduction to some related operation skills of Android onKey.

Added a GridView to the Activity subclass Gstock,

 
 

  
  
setContentView(R.layout.gstock);   
  
  
GridView gridview = (GridView) findViewById(R.id.gridviewMain);  
 
 

And set

 
 

  
  
gridview.setOnItemClickListener(new GstockGridViewItemClickListener(this)); 
 
 

Click "select" and then reset Gstock.

 
 

  
  
setContentView(new MyStock(this.g));  
 
 

In this case, MyStock extends SurfaceView implements SurfaceHolder. Callback and OnKeyListener

 
 

  
  
Public MyStock (Context context ){
  
  
Super (context );
  
  
Holder = this. getHolder ();
  
  
Holder. addCallback (this );
  
  
This. setFocusable (true );
  
  
This. setOnKeyListener (this); // listens to the onKey event
  
  
}
 
 

From the screen of the GridView to MyStock, sometimes the Android onKey event cannot be triggered, which is very strange. It can be triggered sometimes. It is a simulator problem ????

Unable to listen: When the GridView has a focus, that is, when the screen above the point simulator has a background.

When the mouse clicks the GridView, there is no focus, and there is no background after it is clicked.

The specific operations of Android onKey are described here.