我希望DialogPreference在onActivityResult之后被调用,所以它可以使用所选图像的Uri位置,在对话框中显示为用户的图像预览,然后点击ok / cancel.

也许我需要在onActivityResult结束时设置一些东西,然后在DialogPreference中调用生命周期钩子,但我不确定.

到目前为止,逻辑是这样的：

ImagePreference.java

public class ImagePreference extends DialogPreference {

    View mView;

    public ImagePreference(Context context,AttributeSet attrs) {
        super(context,attrs);
        initWith(context,attrs);
    }

    private void initWith(Context context,AttributeSet attrs) {
        setWidgetLayoutResource(R.layout.pref_image_widget);
        setDialogLayoutResource(R.layout.pref_image_dialog);

    }

    @Override
    protected View onCreateDialogView() {
        mView = super.onCreateDialogView();

        ImageButton button = (ImageButton) mView.findViewById(R.id.add_image);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                ((SettingsContract.SelectImage)getContext()).fromGallery();
            }
        });

        return mView;
    }

SettingsActivity.java

public class SettingsActivity extends AppCompatActivity
        implements SettingsContract.SelectImage {

    private static final int PICK_IMAGE_REQUEST = 1;

    // ...

    @Override
    public void fromGallery() {
        Intent intent = new Intent();
        // Show only images,no videos or anything else
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        // Always show the chooser (if there are multiple options available)
        startActivityForResult(Intent.createChooser(intent,"Select Picture"),PICK_IMAGE_REQUEST);
    }

    @Override
    protected void onActivityResult(int requestCode,int resultCode,Intent data) {
        super.onActivityResult(requestCode,resultCode,data);    
        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
            Uri uri = data.getData();
            // what to do here??
    }
}