小弟超级新人 正在写一个类似通讯录的东西  现在遇到的问题是不知道如何修改已经添加了的item的内容

如图所示 我想在点开item时出现图二内容（目前用图二只能添加item） 编辑后就可以修改item的内容 但不知如何操作 求大神指条明路

以下是简陋的代码
mainactivity.java

public class MainActivity extends Activity implements View.OnClickListener {
    private SimpleAdapter simpleAdapter;
    private ArrayList<HashMap<String,String>> arrayList=new ArrayList<HashMap<String, String>>();
    private ListView listView;
    public TextView textView2;
    public TextView textView3;
    private Button button;
    public boolean haha=false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button=(Button)findViewById(R.id.add);
        button.setOnClickListener(this);
        textView2=(TextView)findViewById(R.id.textView2);
        textView3=(TextView)findViewById(R.id.textView3);
        listView=(ListView)findViewById(R.id.listView);
        HashMap<String,String> map=new HashMap<String,String>();
        map.put(“name”,”name”);
        map.put(“numble”,”numble”);
        arrayList.add(map);
        simpleAdapter=new SimpleAdapter(this,arrayList,R.layout.item,new String[]{“name”,”numble”},new int[]{R.id.textView2,R.id.textView3});
        listView.setAdapter(simpleAdapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Intent intent=new Intent(MainActivity.this,Tiaozhuan.class);

                startActivityForResult(intent, 100);

            }
        });

    }

    @Override
    public void onClick(View v) {
        Intent intent=new Intent(MainActivity.this,Tiaozhuan.class);
        startActivityForResult(intent,100);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(20==resultCode)
        {
            String name=data.getExtras().getString(“name”);
            String numble=data.getExtras().getString(“numble”);

            HashMap<String,String> map=new HashMap<String,String>();
            map.put(“name”,name);
            map.put(“numble”,numble);
            arrayList.add(map);
            simpleAdapter.notifyDataSetChanged();

        }
    }
}

tiaozhuan.java

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tiaozhuan);
        back=(Button)findViewById(R.id.back);
        name=(EditText)findViewById(R.id.editText);
        numble=(EditText)findViewById(R.id.editText2);

        back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String sname=name.getText().toString();
                String snumble=numble.getText().toString();

                Intent data=new Intent();

                if((!sname.equals(“”))&&(!snumble.equals(“”)))
                {
                    data.putExtra(“name”, sname);
                    data.putExtra(“numble”,snumble);
                    setResult(20, data);
                }
                 finish();

            }
        });
    }
}