StartActivityForresult不会将数据返回到父活动

Question

具有三个活动a，b，c，在活动a a意图打开活动b.on活动b startActivityForresult被调用并打开C。但是在C中调用SetResult C中，它正在返回活动a不b我正在复制我的活动代码，其中IAM调用开始活动创建事件

     @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == SELECT_FILE) {
        if (resultCode == Activity.RESULT_OK) {
            alertDialogBox.dismiss();
            Intent image = new Intent(CreateEventActivity.this, CropImageActivity.class);
            image.putExtra("data", data.getData().toString());
            startActivityForResult(image, 2);
        }
    }
    if (requestCode == 2) {
        if (resultCode == Activity.RESULT_OK) {
            String bt = data.getStringExtra("result");
            file_path = data.getStringExtra("filepath");
            testPath = new File(file_path);
            Log.e("desti", testPath.toString());
            Log.e("destpat", testPath.getAbsolutePath());
            try {
                testPath.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                byte[] encodeByte = Base64.decode(bt, Base64.DEFAULT);
                bitmap2 = BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
                //  imageforUpload = getStringImage(bitmap2);
                BitmapFactory.Options options = new BitmapFactory.Options();
                // down sizing image as it throws OutOfMemory Exception for larger
                // images
                options.inSampleSize = 8;
                final Bitmap bitmaptest = BitmapFactory.decodeFile(file_path, options);
                imgCropped.setVisibility(View.VISIBLE);
                imgCropped.setImageBitmap(bitmaptest);

            } catch (Exception e) {
                e.getMessage();
            }
        }
    }
}

第二个活动作物，我将数据返回父母

     private final CropCallback mCropCallback = new CropCallback() {
    @Override
    public void onSuccess(Bitmap cropped) {
        int height = cropped.getHeight();
        int width = cropped.getWidth();
        if (height<400||width<400){
            Toast.makeText(getApplicationContext(),"this image cat be cropped",Toast.LENGTH_SHORT).show();
        }else {
            Bitmap bitmap = Bitmap.createBitmap(cropped, 0, 0, 400, 400);

            imgtest.setImageBitmap(bitmap);
            SaveImage(bitmap);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
            byte[] b = baos.toByteArray();
            String temp = Base64.encodeToString(b, Base64.DEFAULT);

            Intent returnIntent = new Intent();
            returnIntent.putExtra("result", temp);
            returnIntent.putExtra("filepath", filePath);
            setResult(Activity.RESULT_OK, returnIntent);
            finish();
        }
    }

请帮助我解决这个问题，返回页面是另一个活动

Answer 1

希望您必须更正请求

Intent returnIntent = new Intent();
returnIntent.putExtra("result", temp);
returnIntent.putExtra("filepath", filePath);
setResult(2, returnIntent);
finish();

因为您在这里提到了同样的内容

Intent image = new Intent(CreateEventActivity.this, CropImageActivity.class);
image.putExtra("data", data.getData().toString());
startActivityForResult(image, 2);

Answer 2

First a fall you need to check the flow of control of your code, whether its going in correct blocks or not.

替代您可以按以下解决方案（如果需要），而不是使用 startActivityForresult（）您可以使用 onnewintent（）作为回调方法。

You need to follow few steps.

步骤1：您的' createEeventActivity 'as as" singletask "在您的androidmanifest.xml

中

示例：

 <activity android:name=".CreateEventActivity" android:launchMode="singleTask"/>

步骤2： Override onNewIntent（）

示例：

 @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        if(intent!=null)
        {
            // YOU CAN CHECK FLAGS OVER HERE, BY PASSING THE VALUES THROUGH INTENTS from different other activities
             if(intent.getBooleanExtra("IS_COMING_FROM_CROP_ACTIVITY",false)
             {
                // HANDLE YOUR STUFF
             }
        }
    }

步骤3：如何触发此回调 只需使用startActivity（），即起始性（b，c），一旦"活动c"工作完成了起始性（C，b），并且在活动c

上调用call finish（）

示例

来自'createEventActivity'

startActivity(new Intent(CreateEventActivity.this, CropImageActivity.class));

来自'prapimageactivity '

startActivity(new Intent(CropImageActivity.this, CreateEventActivity.class));
finish();

注意：不用担心活动b实例不会一次又一次创建。如果您找不到W.R.T StartActivityForresult（）的问题，请尝试此解决方案。