Debug wrong (and how to find fault in from LogCat) based on a simple application Gcridview of

debug encoding

Gridview.xml
one, built himself res / layout under

  
android: layout_width = "fill_parent" 
android: layout_height = "fill_parent" 
android: orientation = "vertical" 
> 

android: id = "@ + id / gridview_id" 
android: layout_width = "fill_parent" 
android: layout_height = "wrap_content" 
android: columnWidth = "60dp" 
android: numColumns = "auto_fit" 
android: horizontalSpacing = "1dp" 
android: verticalSpacing = "10dp" 
android: stretchMode = "columnWidth" 
android: gravity = "center"> 
 
 

Two activity.java

 package com.example.gridview; 

import android.os.Bundle; 
import android.app.Activity; 
import android.content.Context; 
import android.support.v4.view.ViewPager.LayoutParams; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.BaseAdapter; 
import android.widget.GridView; 
import android.widget.ImageView; 
import android.widget.Toast; 

public class MainActivity extends Activity implements OnItemClickListener {
private GridView gridview; 
private int [] imageIDs = {
R.drawable.p1, R.drawable.p2, 
R.drawable.p3, R.drawable.p4, 
R.drawable.p5, R.drawable.p6, 
R.drawable.p7, R.drawable.p8, 
R.drawable.p9 
}; 
@ Override 
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 
setContentView (R.layout.gridview); 
gridview = (GridView) findViewById (R.id.gridview_id); 
gridview.setAdapter (new ImageAdapter (this)); 
gridview.setOnItemClickListener (this); 


} 

public class ImageAdapter extends BaseAdapter {

private Context context; 
public ImageAdapter (Context c) {
context = c; 

} 
public int getCount () {
/ / TODO Auto-generated method stub 
return imageIDs.length; 
} 

@ Override 
public Object getItem (int position) {
/ / TODO Auto-generated method stub 
return imageIDs [position]; 
} 

@ Override 
public long getItemId (int position) {
/ / TODO Auto-generated method stub 
return position; 
} 

@ Override 
public View getView (int position, View convertView, ViewGroup parent) {
ImageView imageview; 
if (convertView == null) {
imageview = new ImageView (context); 
imageview.setLayoutParams (new android.view.ViewGroup.LayoutParams (LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
imageview.setScaleType (ImageView.ScaleType.CENTER); 
imageview.setPadding (8, 8, 8, 8); 
} 
else {
imageview = (ImageView) convertView; 
} 
imageview.setImageResource (imageIDs [position]); 
return imageview; 
} 
} 
public void onItemClick (AdapterView  parent, View view, int position, long id) {
/ / TODO Auto-generated method stub 
Toast.makeText (this, "first" + position + "pictures", Toast.LENGTH_SHORT) show ();. 

} 
} 

Error message
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Reply:
Used in the GridView control, in addition to writing an xml file (item_gridview.xml), then convertView = LayoutInflater.from (context) inflate (R.layout.item_gridview, null).;
Reply:
No use ah. . . . .
Reply:
In fact, sometimes I have a such a wonderful mistake, then I put a change of control id,,, not out of this error, and still do not know what the reason is,