在活动之间传递数据 - Android SDK

Question

我已经阅读了以前发布的问题和答案2天，并且我尝试了所有建议的变体以及在清单中将我的launchMode属性设置为“标准”。

我试图在按下按钮后将数据从我的第二个活动传回我的第一个活动。按下按钮后，第一个活动启动，但它不回到我的onActivityResult（）方法。我无法弄清楚为什么会发生这种情况。

下面是从活动二我的代码：

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();  

     } 
    }); 

这里的活动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动回调不会在代码妥善安置或者如果我没有正确解雇这个意图，或者我没有用正确的方法或者什么来设置回调。我知道这个话题已经讨论过，但我没有想法。谢谢。

Answer 1

你刚刚得到它。如果活动1应该startActivity2和活性2应该将结果发送回活动1，你需要做的是这样的：

在活动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()