getContext().getSystemService error
So I'm just trying to currently inflate a view in my getView function and getContext() for some reason is saying it's undefined..
package com.MTSUAndroid;
import com.MTSUAndroid.Alarm_Settings.EfficientAdapter1.ViewHolder;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundl开发者_JS百科e;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.ImageView;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap;
public class Alarm_Settings extends ListActivity {
public static class EfficientAdapter1 extends BaseAdapter{
private LayoutInflater mInflater;
public EfficientAdapter1(Context context){
mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
int viewType = this.getItemViewType(position);
switch (viewType)
{
case 1:
holder = new ViewHolder();
View v = convertView;
if (v == null)
{
LayoutInflater vi = null;
//LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.alerts,parent,false);
holder.text1 = (TextView)v.findViewById(R.id.menu_Cancel);
v.setTag(holder);
}
else {
holder = (ViewHolder)v.getTag();
}
return v;
case 2:
ViewHolder holder1 = new ViewHolder();
View v1 = convertView;
if (v1 == null)
{
LayoutInflater vi = null;
//LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v1 = vi.inflate(R.layout.about, parent, false);
holder1.text1 = (TextView)v1.findViewById(R.id.menu_Cancel);
v1.setTag(holder1);
}
else {
holder1 = (ViewHolder)v1.getTag();
}
return v1;
}
return null;
}
static class ViewHolder{
TextView text1;
}
}
public void onCreate(Bundle SavedInstanceState)
{
super.onCreate(SavedInstanceState);
setListAdapter(new EfficientAdapter1(this));
ListView listview = getListView();
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent(Alarm_Settings.this, Alerts.class);
startActivity(intent);
}
});
}
}
This is the piece of code I'm having problems with. LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
getContext() isn't defined for the class and I don't understand why :(
You call it in the class EfficientAdapter1
which does not extend activity and has no such method.
Add a Context
field to the internal class and call getSystemService
on it:
/* snip */
public static class EfficientAdapter1 extends BaseAdapter{
private LayoutInflater mInflater;
private Context ctx;
public EfficientAdapter1(Context context){
mInflater = LayoutInflater.from(context);
ctx = context;
}
/* snip */
LayoutInflater vi = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
/* snip */
getContext() is not a method on BaseAdapter. Store the context given to you in the constructor in a member variable and just use that.
If you don't need to access your BaseAdapter from other Activities, you can replace getContext() with Alarm_Settings.this
You are using BaseAdapter
so you cannot use
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
In the case of ArrayAdapter
you can use it as follows:
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Pass Context
as a parameter in your inner class and then use it where you need it.
精彩评论