Question

我想将一个变量传递给我正在执行SQLite查询的DBConnector.Java，但我不知道该怎么做并需要一些帮助。

public void onItemSelected(AdapterView<?> parent, View view, int position,long id) 
    {
                spinnerRub.setSelection(position);      
            myRub = (String) spinnerRub.getSelectedItem();

    }

现在我想将myRub传递给我的DBConnector.Java：

public List<String> getAllCapabilities1()
{             

List<String> Caps = new ArrayList<String>();

                String selectQuery = "SELECT Cap_Name FROM capability where Rub_ID = 'myRub'";

            SQLiteDatabase database = this.dbOpenHelper.getReadableDatabase();
            //Cursor cursor = database.rawQuery(selectQuery, null);
            Cursor cursor = database.rawQuery(selectQuery, null);
            // looping through all rows and adding to list
            if (cursor.moveToFirst()) 
            {
                do 
                {
                  Caps.add(cursor.getString(0));
                } while (cursor.moveToNext());
            }

            // closing connection
            cursor.close();
            database.close();

            // returning lables
            return Caps;
        }

但我正在努力做到这一点并需要帮助。

Answer 1

使用Intent传递数据：

  i.putExtra("myRub",myRub);

其中i是Intent对象。

使用

在其他活动中检索它

Bundle extras = getIntent().getExtras();
String a = extras.getString("myRub");

Answer 2

在dbconnetion.java文件中修改它，并通过method或sharedpref

传递myrub

String selectQuery = "SELECT Cap_Name FROM capability where Rub_ID = '"+myRub+"'";

两个活动之间

Intent i = new Intent(Intent.ACTION_VIEW);
i.putExtra("myrub", "This value one for ActivityTwo ");
startActivity(i);

Answer 3

以下是将数据传递给活动和检索的示例

Intent intent = new Intent();
intent.setClass(this, New.class);

Bundle b = new Bundle();
b.putInt("action", nResponse ); // integer value
b.putString("homename", sHomeName); // string value
intent.putExtras(b);
startActivity(intent);

你在new.class的oncreate方法请按照

Bundle b = getIntent().getExtras();
if( b != null ){
    nAction = b.getInt("action");
    sHomeName = b.getString("homename");
}

Answer 4

在您的活动中（假设您有对dbConnector的引用？）：

spinnerRub.setSelection(position);      
myRub = (String) spinnerRub.getSelectedItem();
dbConnector.setMyRub(myRub);

在DBConnector.java中

public void setMyRub(String myRub){
    // do what you need to do with myRub
}

Answer 5

使用意图在活动之间传递数据

   Intent intent = new Intent(yourActivity.this, DBConnector.class);
   intent.putExtra("myRub", myRub);
   startActivity(intent);

并使用getIntent().getExtras()将其取回

Android - 将变量传递给另一个活动

5 个答案: