Question

我有一个onItemClickListener列表。在列表中是日期和地点。我想将这个地方（点击时）传递给数据库处理程序，然后在新活动中获取具有相同位置的所有数据。

我在Android方面不太好，所以我问这是否有可能做到这一点？以及如何将带有地名的变量传递给dbHandler？

这是我的onItemClickListener

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_listview);

    mainListView = (ListView) findViewById(R.id.ListViewItem);

    dbHandler = new LogsDBHandler(this);
    ArrayList<Logs> logsList = dbHandler.getAllLogsGroupedByPlace();
    listAdapter = new LogsByPlaceAdapter(logsList);
    mainListView.setAdapter(listAdapter);

    mainListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Intent intent = new Intent(DisplayLogsByPlace.this, LogsList.class);
            startActivity(intent);
        }
    });
}

private class LogsByPlaceAdapter extends BaseAdapter {
    private LayoutInflater inflater;
    private List<Logs> logsList;

    public LogsByPlaceAdapter(List<Logs> logsList) {
        inflater = LayoutInflater.from(DisplayLogsByPlace.this);
        this.logsList = logsList;
    }

    @Override
    public int getCount() {
        return logsList.size();
    }

    @Override
    public Object getItem(int position) {
        return logsList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return logsList.get(position).getId();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.activity_display_logs_by_place, parent, false);
        }

        Logs log = logsList.get(position);
        ((TextView) convertView.findViewById(R.id.textShowDate)).setText(log.getCreatedAt().toString());
        ((TextView) convertView.findViewById(R.id.textShowPlace)).setText(log.getPlace());
        return convertView;
    }
}

这是我的dbHandler，我将其称为此变量

public ArrayList<Logs> getAllLogsWithSamePlace(String place) {
        ArrayList<Logs> logPlaceList = new ArrayList<Logs>();
        String selectQuery = "SELECT * FROM " + TABLE_LOGS + " WHERE " + KEY_PLACE + "=" + place;

        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        if (cursor.moveToFirst()) {
           ...
        }
        return  logPlaceList;
    }

Answer 1

mainListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,        long id) {

    // if your method is static
    ArrayList<String> array = dbHandler.getAllLogsWithSamePlace(place);
    // if not you shoud initialize the dbhandler

    Intent intent = new Intent(DisplayLogsByPlace.this, LogsList.class);

    intent.putArrayListExtra("sameplaceArray", array);

    startActivity(intent);
    }
});


    public ArrayList<Logs> getAllLogsWithSamePlace(String place) {
    ArrayList<Logs> logPlaceList = new ArrayList<Logs>();
    String selectQuery = "SELECT * FROM " + TABLE_LOGS + " WHERE " +    KEY_PLACE + "=" + place;


    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    if (cursor.moveToFirst()) {
       ...
    }
    return  logPlaceList;
}
}

Answer 2

mainListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
   Intent intent = new Intent(DisplayLogsByPlace.this, LogsList.class);
   intent.putExtra("keyword","PlaceValue");
   startActivity(intent);
   }
});

之后在SecondActivity获得这样的意图值

String place=getIntent().getExtra().getString("keyword");

然后调用dbHandler函数获取数据

如何将变量从onClicListener传递给dbHandler

2 个答案: