Android(安卓)stuido程序真机运行时闪退

public class MainActivity extends Activity implements OnClickListener  {    private Button textbtn, imgbtn, videobtn;    private ListView lv;    private Intent i;    private MyAdapter adapter;    private NotesDB notesDB;    private SQLiteDatabase dbReader;    private Cursor cursor;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        }    public void initView() {        lv = (ListView) findViewById(R.id.list);        textbtn = (Button) findViewById(R.id.text);        imgbtn = (Button) findViewById(R.id.img);        videobtn = (Button) findViewById(R.id.video);        textbtn.setOnClickListener(this);        imgbtn.setOnClickListener(this);        videobtn.setOnClickListener(this);        notesDB = new NotesDB(this);        dbReader = notesDB.getReadableDatabase();        lv.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view,                                    int position, long id) {                cursor.moveToPosition(position);                Intent i = new Intent(MainActivity.this, SelectAct.class);                i.putExtra(NotesDB.ID,                        cursor.getInt(cursor.getColumnIndex(NotesDB.ID)));                i.putExtra(NotesDB.CONTENT, cursor.getString(cursor                        .getColumnIndex(NotesDB.CONTENT)));                i.putExtra(NotesDB.TIME,                        cursor.getString(cursor.getColumnIndex(NotesDB.TIME)));                i.putExtra(NotesDB.PATH,                        cursor.getString(cursor.getColumnIndex(NotesDB.PATH)));                i.putExtra(NotesDB.VIDEO,                        cursor.getString(cursor.getColumnIndex(NotesDB.VIDEO)));                startActivity(i);            }        });    }    /** 点击添加数据 */    @Override    public void onClick(View v) {        i = new Intent(this, AddContent.class);        switch (v.getId()) {            case R.id.text:                i.putExtra("flag", "1");                startActivity(i);                break;            case R.id.img:                i.putExtra("flag", "2");                startActivity(i);                break;            case R.id.video:                i.putExtra("flag", "3");                startActivity(i);                break;        }    }    /** listview的数据源 */    public void selectDB() {        cursor = dbReader.query(NotesDB.TABLE_NAME, null, null, null, null, null, null);        adapter = new MyAdapter(this, cursor);        lv.setAdapter(adapter);    }    /** 在点击保存数据 回到主界面后调用 */    @Override    protected void onResume() {        super.onResume();        selectDB();    }}
看log是指针空了但是我不知道应该如何修改啊是在MyAdpter这个文件里面改嘛?新手上路求指导一下啊
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