重写BaseAdapter的时候出现有关问题了

package com.example.baseadapter;

import android.R.raw;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.TextView;

public class mybadapter extends BaseAdapter {
	LayoutInflater inflate;
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return 10;
	}

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

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder holder=null;
		if (convertView == null) {
			convertView = inflate.inflate(R.layout.list, null);      //<--35行在这
			holder=new ViewHolder();
			holder.tView=(TextView) convertView.findViewById(R.id.tv);
			holder.editText=(EditText) convertView.findViewById(R.id.et);
			convertView.setTag(holder);
			holder.editText.setTag(position);
		} else {
			holder=(ViewHolder) convertView.getTag();
			convertView.setTag(holder);
		}
		holder.tView.setText("测试：" + position);
		holder.editText.setText("测试：" + position);
		return convertView;
	}
	final static class ViewHolder{
		TextView tView;
		EditText editText;
	}
}

03-25 08:39:43.351: E/Trace(8121): error opening trace file: No such file or directory (2)
03-25 08:39:45.818: E/AndroidRuntime(8121): FATAL EXCEPTION: main
03-25 08:39:45.818: E/AndroidRuntime(8121): java.lang.NullPointerException
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at com.example.baseadapter.mybadapter.getView(mybadapter.java:35)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.AbsListView.obtainView(AbsListView.java:2159)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.ListView.measureHeightOfChildren(ListView.java:1246)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.ListView.onMeasure(ListView.java:1158)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.View.measure(View.java:15518)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.View.measure(View.java:15518)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.View.measure(View.java:15518)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.View.measure(View.java:15518)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.View.measure(View.java:15518)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
03-25 08:39:45.818: E/AndroidRuntime(8121): 	at android.view.Choreographer.doCallbacks(Choreographer.java:562)