變量未從空

Question

我的程序量變到質變的sposes改變BNAME到位置，但不會出於某種原因 我發送位置記錄Expeance這個waycase R.id.record_expeance：

  startActivity(new Intent(BudgetStart.this, RecordExpeance.class)); 
      ex.changeName(position); 
      BudgetStart.this.finish(); 
      break; 

後，即應等於位置，但它reamains空林不知道這是否是因爲我啓動類新的或什麼，但我不能弄明白

package budget.app; 


import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 

public class RecordExpeance extends Activity implements OnClickListener 
{  
private String bname; 
protected void onCreate(Bundle savedInstanceState) 
{ 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.recordexpeance); 
    final BudgetDB entry = new BudgetDB(RecordExpeance.this); 
    EditText a =(EditText)findViewById(R.id.txtExpeance); 
    EditText b =(EditText)findViewById(R.id.txtEMomo); 
    TextView c =(TextView)findViewById(R.id.lblBudgetAmount); 
    TextView d =(TextView)findViewById(R.id.lblBudgetName); 
    d.setText(bname); 

    String bamount; 

    entry.open(); 
    bamount = entry.getBamount(bname); 
    entry.close(); 

    Button A = (Button)findViewById(R.id.btnFinish); 

    A.setOnClickListener(this); 
} 

public void onClick(View argo) 
{ 
    // TODO Auto-generated method stub 
    startActivity(new Intent(RecordExpeance.this, BudgetStart.class)); 
    RecordExpeance.this.finish(); 
} 
public void changeName(String position) 
{ 
    // TODO Auto-generated method stub 

    bname = position; 
} 
} 

任何和所有幫助是極大appricheated

Answer 1

這將是更容易通過position的意圖：

Intent intent = new Intent(BudgetStart.this, RecordExpeance.class); 
intent.putExtra("position", position); 
startActivity(intent); 
BudgetStart.this.finish(); 
break; 

然後從意向在RecordExpeance閱讀：

super.onCreate(savedInstanceState); 
setContentView(R.layout.recordexpeance); 

bname = getIntent().getIntExtra("position", 1); 
// Where 1 is the default value if you forgot use putExtra()