在活動之間傳遞數據 - Android SDK

Question

我已經閱讀了以前發佈的問題和答案2天，並且我嘗試了所有建議的變體以及在清單中將我的launchMode屬性設置爲「標準」。

我試圖在按下按鈕後將數據從我的第二個活動傳回我的第一個活動。按下按鈕後，第一個活動啓動，但它不回到我的onActivityResult（）方法。我無法弄清楚爲什麼會發生這種情況。

下面是從活動二我的代碼：

Button btnAdd = (Button) findViewById(R.id.btnAdd); 
    btnAdd.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View v) { 

      //Check that message is printed out to LogCat 
      System.out.println("hello test1 Activity2"); 

      EditText band = (EditText) findViewById(R.id.txtBand); 
      band.setFilters(new InputFilter[] { 
        new InputFilter.LengthFilter(9) 
      }); 
      EditText album = (EditText) findViewById(R.id.txtAlbum); 
      album.setFilters(new InputFilter[] { 
        new InputFilter.LengthFilter(9) 
      }); 
      final Spinner genre = (Spinner) findViewById(R.id.spin_genre); 
      TextView selection = (TextView)genre.getSelectedView(); 

      CharSequence strBand = band.getText(); 
      CharSequence strAlbum = album.getText(); 
      CharSequence strGenre = selection.getText(); 

      //Check that we got input values 
      System.out.println("hello test Activity2- " + 
        strBand + " - " + strAlbum + " - " + strGenre); 

      //**********Intent Declaration************ 

      Intent i = new Intent(getApplicationContext(), Activity1.class); 

      i.putExtra("strBand", strBand); 
      i.putExtra("strAlbum", strAlbum); 
      i.putExtra("strGenre", strGenre); 
      startActivityForResult(i, 0); 
      setResult(RESULT_OK, i); 
      finish();  

     } 
    }); 

這裏的活動1：

public class Activity1 extends Activity { 
/** Called when the activity is first created. */ 
@SuppressWarnings("deprecation") 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 


    Button addAlbum = (Button) findViewById(R.id.btnMain); 
    addAlbum.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View v) { 
      Intent i = new Intent(); 
      i.setClassName("jorge.jorge.jorge", 
        "jorge.jorge.jorge.Activity2"); 
      startActivity(i); 

     } 
    }); 

}// end of onCreate() 

    //******************Callback Method**************************** 
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{ 
    super.onActivityResult(requestCode, resultCode, data); 
    //Checks if we got to ActivityResult 
    System.out.println("hello test 2: We got to Activity1"); 

    if (resultCode == RESULT_OK) 

    { 

     Bundle returndata = data.getExtras(); 

     String strAlbum = returndata.getString("strAlbum"); 

     String strBand = returndata.getString("strBand"); 

     String strGenre = returndata.getString("strGenre"); 

     // check to see if we got the variable values from activity2 
     System.out.println("hello test 2: We got to Activity1 with variables - " 
       + strBand + " - " + strAlbum + " - " + strGenre); 

     //Create table layout to contains views with variable values 
     TableLayout table = new TableLayout(this); 
     table.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, 
       LayoutParams.WRAP_CONTENT)); 
     //creates row with parameters 
     TableRow row = new TableRow(this); 
     row.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, 
       LayoutParams.WRAP_CONTENT)); 

     //text views to contain variable values 
     TextView tv1 = new TextView(this); 
     tv1.setText(strBand); 
     row.addView(tv1); 
     TextView tv2 = new TextView(this); 
     tv2.setText(strAlbum); 
     row.addView(tv2); 
     TextView tv3 = new TextView(this); 
     tv3.setText(strGenre); 
     row.addView(tv3); 
     //adds the table row to the table layout 
     table.addView(row); 
    } 

}// end onActivityResult() 

}

我不知道如果我的活動回調不會在代碼妥善安置或者如果我沒有正確解僱這個意圖，或者我沒有用正確的方法或者什麼來設置回調。我知道這個話題已經討論過，但我沒有想法。謝謝。

Answer 1

你剛剛得到它。如果活動1應該startActivity2和活性2應該將結果發送回活動1，你需要做的是這樣的：

在活動1 ：

Intent i = new Intent(); 
i.setClassName("jorge.jorge.jorge", "jorge.jorge.jorge.Activity2"); 
startActivityForResult(i); // This starts Activity2 and waits for the result 

在活性2 ：

Intent i = new Intent(getApplicationContext(), Activity1.class); 
i.putExtra("strBand", strBand); 
i.putExtra("strAlbum", strAlbum); 
i.putExtra("strGenre", strGenre); 
setResult(RESULT_OK, i); 
finish(); // This closes Activity2 and generates the callback to Activity.onActivityResult()