java - 将 sqLite DB 中的数据显示到不同的 TextView 中

Question

现在我有一个工作的 sqLite 数据库，一个工作 ListView 上的工作数据库搜索，显示搜索到的数据。

但我不知道如何将数据库结果中的数据显示到不同的 TextView 中。

我有 3 个关于数据库的 Activity :

搜索 Activity -> ListView Activity -> 详细信息 Activity

如何将 ListView 中的选定项目放入新 Activity 中，并使用数据库中的数据填充 TextView？

希望你能明白我的意思。用英语写作不是我最好的技能；)

代码如下:

ShowStations.java

package san.tal.tfapp.Bahnhoefe;


import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;


import san.tal.tfapp.R;

public class ShowStations extends ActionBarActivity {


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_show_stations2);


    //TextViews werden eingebunden
    TextView station_ckanal = (TextView) findViewById(R.id.tv_show_ckanal);
    TextView station_fdl = (TextView) findViewById(R.id.tv_show_fdl);
    TextView station_lastrecke = (TextView) findViewById(R.id.tv_show_laStrecke);
    TextView station_linie = (TextView) findViewById(R.id.tv_show_linie);
    TextView station_art = (TextView) findViewById(R.id.tv_art);

    }




@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_show_stations, 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);
}

}

ShowStationList.java

  package san.tal.tfapp.Bahnhoefe;

  import android.content.Intent;
  import android.support.v7.app.ActionBarActivity;
  import android.os.Bundle;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.widget.AdapterView;
  import android.widget.ArrayAdapter;
  import android.widget.ListView;
  import android.widget.Toast;

  import java.io.IOException;
  import java.util.List;

  import san.tal.tfapp.Database.DatabaseSourceStations;
  import san.tal.tfapp.Models.Station;
  import san.tal.tfapp.R;
  import san.tal.tfapp.showPhoneNumbers;

  public class ShowStationList extends ActionBarActivity {

  public static final String KEY_SEARCH_STRING = "key_search_string";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_show_station_list);

    final ListView stationsListView = (ListView) findViewById(R.id.listView);
    stationsListView.setEmptyView(findViewById(android.R.id.empty));

    Intent intent = getIntent();
    String searchString = intent.getStringExtra(KEY_SEARCH_STRING);
    if (searchString != null) {

        final List<Station> stations = queryList(searchString);
        String[] namesArray = Station.getNamesArray(stations);
        stationsListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, namesArray));

        stationsListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                stations.get(position).getId();
            }
        });
    } else {
        Toast.makeText(this, "Kein Suchbegriff eingegeben", Toast.LENGTH_LONG).show();
    }


}

private List<Station> queryList(String searchString) {

    DatabaseSourceStations databaseSourceStations = new DatabaseSourceStations(this);
    try {
        databaseSourceStations.open();
    } catch (IOException e) {
        e.printStackTrace();
        Toast.makeText(this, "Datenbank konnte nicht kopiert werden!", Toast.LENGTH_LONG);
    }
    List<Station> stationList = databaseSourceStations.searchStation(searchString);
    databaseSourceStations.close();

    return stationList;
}

@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_show_station_list, 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);
    }
 }

DatabaseSourceStations.java

package san.tal.tfapp.Database;

import android.content.ContentValues; 
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import san.tal.tfapp.Models.Station;

/**
 * Created by Talsan on 17.02.2015.
 */
public class DatabaseSourceStations {

SQLiteDatabase database;
DatabaseHelperStations databaseHelperStations;

public DatabaseSourceStations(Context context) {
    databaseHelperStations = DatabaseHelperStations.instance(context);
}

public void open() throws IOException {
    database = databaseHelperStations.getWritableDatabase();
}

public void close() {
    database.close();
}

public long addStation(Station station) {

    ContentValues contentValues = new ContentValues();
    contentValues.put(DatabaseHelperStations.COLUMN_NAME, station.getName());
    contentValues.put(DatabaseHelperStations.COLUMN_RIL100, station.getRil100());
    contentValues.put(DatabaseHelperStations.COLUMN_CKANAL, station.getCkanal());
    contentValues.put(DatabaseHelperStations.COLUMN_LASTRECKE, station.getLastrecke());
    contentValues.put(DatabaseHelperStations.COLUMN_LINIE,  station.getLinie());
    contentValues.put(DatabaseHelperStations.COLUMN_FDL, station.getFdl());
    contentValues.put(DatabaseHelperStations.COLUMN_ART, station.getArt());

    return database.insert(DatabaseHelperStations.DB_NAME, null, contentValues);
}

public void addStations(List<Station> stationList) {

    for (Station station : stationList) {
        addStation(station);
    }
}

public List<Station> getEverything() {
    String query = "SELECT * FROM " + DatabaseHelperStations.DB_NAME + ";";

    return cursorToStationList(database.rawQuery(query, null));
}

public List<Station> searchStation(String searchString) {

    String optimizedQuery = "%" + searchString + "%";

    String query = "SELECT * FROM " + DatabaseHelperStations.DB_NAME +
            " WHERE " + DatabaseHelperStations.COLUMN_NAME + " LIKE '" +  optimizedQuery + "' OR " + DatabaseHelperStations.COLUMN_RIL100 + " LIKE '" +  optimizedQuery + "';";

    return cursorToStationList(database.rawQuery(query, null));
}

public List<Station> cursorToStationList(Cursor cursor) {

    if (cursor == null) {
        return null;
    }

    cursor.moveToFirst();

    List<Station> stations = new ArrayList<>();

    while (!cursor.isAfterLast()) {

        stations.add(cursorToStation(cursor));

        cursor.moveToNext();
    }

    return stations;
}

    public Station cursorToStation(Cursor cursor) {
    Station station = new Station();
    station.setId(cursor.getInt(0));
    station.setName(cursor.getString(1));
    station.setRil100(cursor.getString(2));
    station.setCkanal(cursor.getString(3));
    station.setLastrecke(cursor.getInt(4));
    station.setLinie(cursor.getString(5));
    station.setFdl(cursor.getString(6));
    station.setArt(cursor.getString(7));
    return station;
    }

}

Answer 1

执行类似 get 的操作，获取 onItemClick 函数中的所有相应字段 将信息放入 Bundle 中，如下所示 bundle = new Bundle();

bundle.pustString(key,value);

然后通过 Intent 与信息启动 Activity

Intent intent = new Intent();
intent.pustExtra(key,bundle);
startActivity(intent);

在详细信息 Activity 中，从 Intent 中获取 bundle ，如下所示

Intent intent = getIntent();
Bundle bundle = intent.getExtras();

迭代bundle以获取各个值，以便您可以通过调用在TextViews中设置它们

textView.setText(bundle.getString(key));