Problème avec startactivity

Bonjour;
j'ai un probleme avec listview et startactivity quand je lance l'app et que je clique sur un item l'app s'arrete (unfortunately soh1 has stopped);pourtant tout me semble correct?voici mon code
Code:
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import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.GridLayout;
import android.widget.ListView;
 
import java.util.ArrayList;
 
 
public class Soh1Activity extends Activity implements AdapterView.OnItemClickListener{
    Soh1adapter adapter;
    Context c;
    Button b1,b2;
    ArrayList<Mydatas4> ald, onerow;
    ArrayList<ArrayList>allrows;
    GridLayout gr;
    int g=0;
    Myarray mya;
    Mydatas4 myd;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_soh1);
        myd = new Mydatas4("", "ffffff", g);
        c = getApplicationContext();
        mya = new Myarray(c);
        mya.gettingal(true);
 
 
        ald=mya.al2;
       allrows=mya.allrows;
        b1 = (Button) findViewById(R.id.button);
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mya.gettingal(true);
                ald = mya.al2;
          //      setallrows();
            }
        });
        b2 = (Button) findViewById(R.id.button2);
        b2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mya.gettingal(false);
                ald = mya.al2;
          //      setallrows();
            }
        });
        final ListView list = (ListView) findViewById(R.id.listView);
        adapter = new Soh1adapter(this,allrows);
        list.setAdapter(adapter);
        list.setOnItemClickListener(this);
 
    }
 
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        ArrayList row=    adapter.getItem(position);
        View nv=view;
        Intent i=new Intent(getApplicationContext(),Detail.class);
        i.putExtra("detail", row);
        if(i!=null) {
            startActivity(i);
        }
    }
 
/*
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_soh1, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
 
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
 
        return super.onOptionsItemSelected(item);
    }
    */
}