不同活动的片段之间的共享元素转换

Question

我正在尝试在不同活动的片段之间实现共享元素转换，我已经实现了共享元素进入转换，但无法管理回退转换。

片段 A 托管在 Activity A 中，单击按钮时，图像被添加为共享元素，然后启动 Activity B，其中托管包含共享元素的目标视图的 Fragment B。

活动一：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_a);

    getSupportFragmentManager()
            .beginTransaction()
            .addToBackStack(null)
            .replace(R.id.content, FragmentA.newInstance())
            .commit();
}

@Override
public void onBackPressed() {
    super.onBackPressed();
    finishAfterTransition();
}

片段A：

 @Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    postponeEnterTransition();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        setSharedElementEnterTransition(TransitionInflater.from(getContext()).inflateTransition(android.R.transition.move));
        setSharedElementReturnTransition(TransitionInflater.from(getContext()).inflateTransition(android.R.transition.move));
    }
}


@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        final ImageView imageView = (ImageView) view.findViewById(R.id.simple_activity_a_imageView);

        Button button = (Button) view.findViewById(R.id.simple_activity_a_btn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getActivity(), ActivityB.class);
                ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(
                        getActivity(),
                        imageView,
                        ViewCompat.getTransitionName(imageView));
                startActivity(intent, options.toBundle());
            }
        });

    }

活动乙：

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fragment_to_fragment);

    getSupportFragmentManager()
            .beginTransaction()
            .addToBackStack(null)
            .replace(R.id.content, FragmentB.newInstance())
            .commit();
}

@Override
public void onBackPressed() {
    super.onBackPressed();
    finishAfterTransition();
}

片段B：

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    postponeEnterTransition();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        setSharedElementEnterTransition(TransitionInflater.from(getContext()).inflateTransition(android.R.transition.move));
        setSharedElementReturnTransition(TransitionInflater.from(getContext()).inflateTransition(android.R.transition.move));
    }
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    TextView detailTextView = (TextView) view.findViewById(R.id.simple_activity_b_text);
    detailTextView.setText("detail");

    ImageView imageView = (ImageView) view.findViewById(R.id.simple_activity_b_image);
    imageView.setVisibility(View.VISIBLE);
    view.findViewById(R.id.activity_simple_two).setVisibility(View.VISIBLE);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        imageView.setTransitionName(getString(R.string.simple_activity_transition));
    }

    Glide.with(this)
            .load(GlideFragmentA.ARMADILLO_PIC_URL)
            .centerCrop()
            .dontAnimate()
            .listener(new RequestListener<String, GlideDrawable>() {
                @Override
                public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
                    startPostponedEnterTransition();
                    return false;
                }

                @Override
                public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
                    startPostponedEnterTransition();
                    return false;
                }
            })
            .into(imageView);
}

Answer 1

这是因为imageView在片段中...它不是Activity B 的元素..所以在

活动 B 你可以做这样的事情并测试它..

@Override
protected void onCreate(Bundle savedInstanceState) {

   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_fragment_to_fragment);

   FrameLayout frame = (FrameLayout) findViewById(R.id.content);

   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

          frame 
         .setTransitionName(getString(R.string.simple_activity_transition));
        }


        getSupportFragmentManager()
                 .beginTransaction()
                 .addToBackStack(null)
                 .replace(R.id.content, FragmentB.newInstance())
                 .commit();
     }

     @Override
     public void onBackPressed() {
     super.onBackPressed();
     finishAfterTransition();
   }

现在您可以测试检查是否onBackPressed会有过渡。