Android 调用ActivityResult（）时出错

我有两个活动A和B，它们都在使用

onActivityResult（）

过程：

工作区中的onActivityResult（）

在活动B中，我有两个

onActivityResult（）

（如下代码所示）。第一个是可单击的

文本视图

，也可以正常工作。另一个为

按钮

我面临的问题是按钮，它假设从B的子活动中获取位图，并显示在B的ImageView中。当我单击按钮时，它会将我带到活动A的

onActivityResult（）

startActivityForResult（）

在活动B的按钮中：

int capSig = arg0.getId();
if(capSig == R.id.capSig)      //Button  which takes me to sub-activity of B
{
    Intent goToCapSignatures = new Intent(this, CaptureSignature.class);
    startActivityForResult(goToCapSignatures, GET_SIG);

}

Bitmap returnedBitmap = Bitmap.createBitmap(mContent.getWidth(),
                 mContent.getHeight(), Bitmap.Config.ARGB_8888);
         Canvas canvas = new Canvas(returnedBitmap);
         Drawable bgDrawable = mContent.getBackground();
         if (bgDrawable != null)
             bgDrawable.draw(canvas);
         else
             canvas.drawColor(Color.WHITE);
         mContent.draw(canvas);

         ByteArrayOutputStream bs = new ByteArrayOutputStream();
         returnedBitmap.compress(Bitmap.CompressFormat.PNG, 50, bs);
         byte[] byteArray = bs.toByteArray();
         Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray , 0, byteArray.length);



         //send the captured signature to Check and Operations page
         Intent returncapSigIntent = new Intent();
         returncapSigIntent.putExtra("signature",bitmap);
        setResult(RESULT_OK, returncapSigIntent);
        finish();

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
      if (requestCode == GET_NOTES)        // For textview (working fine)
      {
        if(resultCode == RESULT_OK)
        {
            if (data.hasExtra("notes ready")) 
        {
            String readyNotes = data.getExtras().getString("notes ready");
            showNotesFromNotesClass.setText(readyNotes);
        }
      }

      if (requestCode == GET_SIG)         // for Button - this isn't being  
                                                      called instead 
      {
          if(resultCode == RESULT_OK)
          {
            if (data.hasExtra("signature")) 

                //display Bitmap in an ImageView

                capturedSigImageFromCapSigclass = (Bitmap) data.getExtras().get("signature");
                imgSig.setImageBitmap(capturedSigImageFromCapSigclass);
            }
          }

    }
      }
}

如何将ByteArray更改为位图并将位图发送到活动B：

int capSig = arg0.getId();
if(capSig == R.id.capSig)      //Button  which takes me to sub-activity of B
{
    Intent goToCapSignatures = new Intent(this, CaptureSignature.class);
    startActivityForResult(goToCapSignatures, GET_SIG);

}

Bitmap returnedBitmap = Bitmap.createBitmap(mContent.getWidth(),
                 mContent.getHeight(), Bitmap.Config.ARGB_8888);
         Canvas canvas = new Canvas(returnedBitmap);
         Drawable bgDrawable = mContent.getBackground();
         if (bgDrawable != null)
             bgDrawable.draw(canvas);
         else
             canvas.drawColor(Color.WHITE);
         mContent.draw(canvas);

         ByteArrayOutputStream bs = new ByteArrayOutputStream();
         returnedBitmap.compress(Bitmap.CompressFormat.PNG, 50, bs);
         byte[] byteArray = bs.toByteArray();
         Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray , 0, byteArray.length);



         //send the captured signature to Check and Operations page
         Intent returncapSigIntent = new Intent();
         returncapSigIntent.putExtra("signature",bitmap);
        setResult(RESULT_OK, returncapSigIntent);
        finish();

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
      if (requestCode == GET_NOTES)        // For textview (working fine)
      {
        if(resultCode == RESULT_OK)
        {
            if (data.hasExtra("notes ready")) 
        {
            String readyNotes = data.getExtras().getString("notes ready");
            showNotesFromNotesClass.setText(readyNotes);
        }
      }

      if (requestCode == GET_SIG)         // for Button - this isn't being  
                                                      called instead 
      {
          if(resultCode == RESULT_OK)
          {
            if (data.hasExtra("signature")) 

                //display Bitmap in an ImageView

                capturedSigImageFromCapSigclass = (Bitmap) data.getExtras().get("signature");
                imgSig.setImageBitmap(capturedSigImageFromCapSigclass);
            }
          }

    }
      }
}

活动B中的onActivityResult（）：

int capSig = arg0.getId();
if(capSig == R.id.capSig)      //Button  which takes me to sub-activity of B
{
    Intent goToCapSignatures = new Intent(this, CaptureSignature.class);
    startActivityForResult(goToCapSignatures, GET_SIG);

}

Bitmap returnedBitmap = Bitmap.createBitmap(mContent.getWidth(),
                 mContent.getHeight(), Bitmap.Config.ARGB_8888);
         Canvas canvas = new Canvas(returnedBitmap);
         Drawable bgDrawable = mContent.getBackground();
         if (bgDrawable != null)
             bgDrawable.draw(canvas);
         else
             canvas.drawColor(Color.WHITE);
         mContent.draw(canvas);

         ByteArrayOutputStream bs = new ByteArrayOutputStream();
         returnedBitmap.compress(Bitmap.CompressFormat.PNG, 50, bs);
         byte[] byteArray = bs.toByteArray();
         Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray , 0, byteArray.length);



         //send the captured signature to Check and Operations page
         Intent returncapSigIntent = new Intent();
         returncapSigIntent.putExtra("signature",bitmap);
        setResult(RESULT_OK, returncapSigIntent);
        finish();

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
      if (requestCode == GET_NOTES)        // For textview (working fine)
      {
        if(resultCode == RESULT_OK)
        {
            if (data.hasExtra("notes ready")) 
        {
            String readyNotes = data.getExtras().getString("notes ready");
            showNotesFromNotesClass.setText(readyNotes);
        }
      }

      if (requestCode == GET_SIG)         // for Button - this isn't being  
                                                      called instead 
      {
          if(resultCode == RESULT_OK)
          {
            if (data.hasExtra("signature")) 

                //display Bitmap in an ImageView

                capturedSigImageFromCapSigclass = (Bitmap) data.getExtras().get("signature");
                imgSig.setImageBitmap(capturedSigImageFromCapSigclass);
            }
          }

    }
      }
}

onActivityResult（）

在活动A中：（改为调用此函数）

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{

      if (resultCode == RESULT_OK && requestCode == REQUEST_APPLIANCE) {
        if (data.hasExtra("selected appliance")) 
        {
            String selectedAppType = data.getExtras().getString("selected appliance");
            tvApplianceType.setText(selectedAppType);
          Toast.makeText(this, data.getExtras().getString("selected appliance"),
            Toast.LENGTH_SHORT).show();
        }
      }
    }

---

我确信我正在做一些工作。请给我一些指示或指导我哪里出了问题。这将非常感谢，因为我已经在这个逻辑上花了几天时间，没有取得任何进展。谢谢你可以简单地更改每个活动的requestCode值，以确保只调用一个

requestsCode只是int常量，它们只是代表

private static final int GET_NOTES = 0;

...

private static final int GET_SIG = 1;
...

private static final int REQUEST_APPLIANCE = 2;

---

这应该足以使结果多样化

谢谢你的回复mate。你的意思是在我的代码

onActivityResult（）中更改
requestCode
，比如'if（resultCode==RESULT\u OK&&requestCode==2）`？不，您必须在声明变量GET_NOTES、GET_SIG和REQUEST_APPLIANCE的地方更改它，只需确保它们代表它们之间的不同数字（它们在活动调用方和获取结果的活动中必须相同）我已经按照你的建议做了，但是仍然不起作用。请记住，REQUEST_APPLIANCE在一个类中，GET_NOTES和GET SIG都在另一个类中。这不起作用是因为我在两个不同的类中使用了它们吗？如果你从类a调用活动B，它将始终向类a返回代码，如果你从C调用D，则返回相同的代码。你能让它工作的唯一方法是使用一个集中的活动，它可以启动更多的活动并控制返回的代码库，我不能理解你。请你详细说明一下。