java - 如果未选择图像，如何将默认图像传递给上一个 Activity

Question

在我的应用程序中，我有一个相机功能。用户可以捕获图像或从图库中选择。

Activity B

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
            case RESULT_LOAD_IMAGE:
                if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK & null != data) {
                    selectedImage = data.getData();
                    imageView.setImageURI(selectedImage);
                }

                break;

            case REQUEST_IMAGE_CAPTURE:
                if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
                    try {
                        selectedImage = imageUri;
                        getContentResolver().notifyChange(selectedImage, null);
                        imageView.setImageURI(null);
                        imageView.setImageURI(imageUri);
                    } catch (Exception e) {
                        Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT)
                                .show();

                    }
                }
        }
    }

 submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent returnIntent = new Intent();
                if(selectedImage!=null) {
                    returnIntent.putExtra("img_uri", selectedImage.toString());
                }
                setResult(Activity.RESULT_OK, returnIntent);
                finish();
            }
        });

当提交按钮被点击时，它将返回到之前的 Activity 。

Activity A

  @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
        if (resultCode == RESULT_OK) {
            if (requestCode == PROJECT_REQUEST_CODE) {
                imgURI = Uri.parse(data.getStringExtra("img_uri"));
                if (mClickedPosition == -1) { 
                    if (obj != null)
                        obj.addNewItem(imgURI);
                } else {
                    if (obj != null)
                     obj.changeItem(mClickedPosition, imgURI);
                }
            }
        }
    }

My question now is how to pass a default image to Activity A If user didn't select any image ?

这是 Activity B 中的 xml imageView

  <ImageView
                android:paddingTop="30dp"
                android:layout_gravity="center"
                android:layout_width="330dp"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:src="@mipmap/no_image"
                android:scaleType="fitXY"
                android:id="@+id/imageView"
                android:layout_weight="0.50" />

如果没有选择图像，我希望 @mipmap/no_image 返回 Activity B。这可能吗？谢谢。

Answer 1

您可以通过以下方式传递存储在资源中的图像的 Uri:

submit.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent returnIntent = new Intent();
        if(selectedImage!=null) {
            returnIntent.putExtra("img_uri", selectedImage.toString());
        } else {
            returnIntent.putExtra("img_uri", Uri.parse("android.resource://your.package.name/mipmap/no_image").toString());
        }
        setResult(Activity.RESULT_OK, returnIntent);
        finish();
    }
});

然后你可以像往常一样使用 Uri 在 ImageView 中显示图像。