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晚上好，stackoverflow 的好心人。我希望从我的数据库中提取所有数据并将其显示在 TextView 中。我怎样才能做到这一点？

此外，我想将数据（全部）从数据库中提取出来，并通过肥皂消息将其发送到远处的 WS。我对 WSDL 设置没有任何疑问，但我确实需要有关如何从数据库中提取数据并一次又一次使用它的信息。

这是代码：

package com.example.prototype2;



import android.os.Bundle;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.support.v4.app.NavUtils;

public class AddGlucose extends Activity implements OnClickListener {

final String LOG_TAG = "myLogs";

Button btnAdd, btnRead, btnClear;
  EditText etGlucose, etTime, etDate;

  DBHelper dbHelper;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_add_glucose);
 // Show the Up button in the action bar.
 setupActionBar();

 btnAdd = (Button) findViewById(R.id.btnAdd);
 btnAdd.setOnClickListener(this);

 btnRead = (Button) findViewById(R.id.btnRead);
 btnRead.setOnClickListener(this);

 btnClear = (Button) findViewById(R.id.btnClear);
 btnClear.setOnClickListener(this);

 etGlucose = (EditText) findViewById(R.id.etGlucose);
 etTime = (EditText) findViewById(R.id.etTime);
 etDate = (EditText) findViewById(R.id.etDate);
 dbHelper = new DBHelper(this);
}

/**
* Set up the {@link android.app.ActionBar}.
*/
private void setupActionBar() {

getActionBar().setDisplayHomeAsUpEnabled(true);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.add_glucose, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
    // This ID represents the Home or Up button. In the case of this
    // activity, the Up button is shown. Use NavUtils to allow users
    // to navigate up one level in the application structure. For
    // more details, see the Navigation pattern on Android Design:
    //
    // http://developer.android.com/design/patterns/navigation.html#up-vs-back
    //
    NavUtils.navigateUpFromSameTask(this);
    return true;
}
return super.onOptionsItemSelected(item);
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
ContentValues cv = new ContentValues();
String glucose = etGlucose.getText().toString();
String time = etTime.getText().toString();
String date = etDate.getText().toString();

SQLiteDatabase db = dbHelper.getWritableDatabase();

switch (v.getId()) {
case R.id.btnAdd:
  Log.d(LOG_TAG, "--- Insert in mytable: ---");

  cv.put("glucose", glucose);
  cv.put("time", time);
  cv.put("date", date);
long rowID = db.insert("mytable", null, cv);
  Log.d(LOG_TAG, "row inserted, ID = " + rowID);
  break;

case R.id.btnRead:
    Log.d(LOG_TAG, "--- Rows in mytable: ---");
    Cursor c = db.query("mytable", null, null, null, null, null, null, null);
    if (c.moveToFirst()) {
        int idColIndex = c.getColumnIndex("id");
        int glucoseColIndex = c.getColumnIndex("glucose");
        int timeColIndex = c.getColumnIndex("time");
        int dateColIndex = c.getColumnIndex("date");

        do {    

            Log.d(LOG_TAG,
                    "ID = " + c.getInt(idColIndex) + 
                    ", glucose = " + c.getString(glucoseColIndex) +
                    ", time = " + c.getString(timeColIndex) + ", date = " +       c.getString(dateColIndex));
        } while (c.moveToNext());
    } else
        Log.d(LOG_TAG, "0 rows");
    c.close();
    break;

 case R.id.btnClear:
  Log.d(LOG_TAG, "--- Clear mytable: ---");

  int clearCount = db.delete("mytable", null, null);
  Log.d(LOG_TAG, "deleted rows count = " + clearCount);
  break;
}
dbHelper.close();
}

class DBHelper extends SQLiteOpenHelper {

    public DBHelper(Context context) {

      super(context, "mytable", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
      Log.d(LOG_TAG, "--- onCreate database ---");
      // создаем таблицу с полями
      db.execSQL("create table mytable ("
          + "id integer primary key autoincrement," 
          + "glucose text,"
          + "time text," + "date text" + ");");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
  }

 }
4

2 回答 2

0

这是一个非常好的 SQLite 示例代码的链接：http ://www.androidhive.info/2011/11/android-sqlite-database-tutorial/

所以你只需要为你的数据库自定义代码，但我想告诉你，如果你为行元素创建一个自定义对象（如示例代码），它会更容易、更舒服。

于 2013-03-09T22:57:45.203 回答
0

你只是在一个类中插入了这么多代码，似乎没有红线。按照这个和下面的教程，只需根据您的需要更改解释的代码。一切正常，您将学习如何在设置数据库后从数据库中获取信息。

数据库是如此重要，以至于您应该稍微研究一下。

啧啧 1

于 2013-03-09T23:44:34.223 回答