Question

我有一个工作ViewPager使用通用图像加载器和ChrisBanes' PhotoView来捏合和缩放图像。在PagerAdapter中，将创建PhotoView并将其添加到instantiateItem()对象中的ViewGroup。我正在尝试添加TextView来显示图像说明。膨胀现有的TextView似乎不起作用，因为不显示描述。以下代码中的LogCat没有错误，只是不显示。在我弄乱ViewPager时，我发现TextView不能与ViewPagers ImageView或PhotoView分开布局。如果TextView和ImageView是单独的布局，则文本不会与ImageView同步。所以我的问题是如何动态地将TextView添加到以下代码的“容器”ViewGroup中？

        @Override
    public Object instantiateItem(ViewGroup container, int position) {
        PhotoView phView = new PhotoView(container.getContext());
        // Attach a PhotoViewAttacher, which takes care of all of the
        // zooming functionality.
        mAttacher = new PhotoViewAttacher(phView);
        final ProgressBar spinner = new ProgressBar(container.getContext());
        imageLoader.displayImage(images[position], phView, options,
                new SimpleImageLoadingListener() {
                    @Override
                    public void onLoadingStarted(String imageUri, View view) {
                        spinner.setVisibility(View.VISIBLE);
                    }

                    @Override
                    public void onLoadingFailed(String imageUri, View view,
                            FailReason failReason) {
                        String message = null;
                        switch (failReason.getType()) {
                        case IO_ERROR:
                            message = "Input/Output error";
                            break;
                        case DECODING_ERROR:
                            message = "Image can't be decoded";
                            break;
                        case NETWORK_DENIED:
                            message = "Downloads are denied";
                            break;
                        case OUT_OF_MEMORY:
                            message = "Out Of Memory error";
                            break;
                        case UNKNOWN:
                            message = "Unknown error";
                            break;
                        }
                        Toast.makeText(getBaseContext(), message,
                                Toast.LENGTH_SHORT).show();

                        spinner.setVisibility(View.GONE);
                    }

                    @Override
                    public void onLoadingComplete(String imageUri,
                            View view, Bitmap loadedImage) {
                        spinner.setVisibility(View.GONE);
                    }
                });

        //--- adding the TextView
        View textviewLayout = inflater.inflate(R.layout.pager_t, container,false);
        TextView txt = (TextView) textviewLayout.findViewById(R.id.redtext_pagertxml_tv);

        txt.setText(imTitlesStr[position]);
        container.addView(phView, LayoutParams.MATCH_PARENT,
                LayoutParams.MATCH_PARENT);
        return phView;

    }

Answer 1

事实证明，动态添加TextView不是答案。我最终为要使用的FrameLayout创建了ViewGroup。

    <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<uk.co.senab.photoview.PhotoView
    android:id="@+id/uilpv_pv"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

<TextView
    android:id="@+id/uilpv_tv"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="top|center_horizontal"
    android:background="#A0449def"
    android:gravity="center"
    android:padding="10dp"
    android:textColor="@android:color/white"
    android:textSize="18sp" />

</FrameLayout>

正如您在XML中看到的那样，我使用的是ChrisBanes' PhotoView而不是ImageView，因此在instantiateItem()中调用PhotoView就像这样：

        @Override
    public Object instantiateItem(ViewGroup view, int position) {
        View imageLayout = inflater
                .inflate(R.layout.uil_pager_item, view, false);
        PhotoView pHview = (PhotoView) imageLayout
                .findViewById(R.id.uilpv_pv);
        mAttacher = new PhotoViewAttacher(pHview);

        imageLoader.displayImage(images[position], pHview, options,
                new SimpleImageLoadingListener() {
                    @Override
                    public void onLoadingStarted(String imageUri, View view) {
                        // spinner.setVisibility(View.VISIBLE);
                    }

                    @Override
                    public void onLoadingFailed(String imageUri, View view,
                            FailReason failReason) {
                        String message = null;
                        switch (failReason.getType()) {
                        case IO_ERROR:
                            message = "Input/Output error";
                            break;
                        case DECODING_ERROR:
                            message = "Image can't be decoded";
                            break;
                        case NETWORK_DENIED:
                            message = "Downloads are denied";
                            break;
                        case OUT_OF_MEMORY:
                            message = "Out Of Memory error";
                            break;
                        case UNKNOWN:
                            message = "Unknown error";
                            break;
                        }
                        Toast.makeText(UILPager.this, message,
                                Toast.LENGTH_SHORT).show();

                        // spinner.setVisibility(View.GONE);
                    }

                    @Override
                    public void onLoadingComplete(String imageUri,
                            View view, Bitmap loadedImage) {
                        // spinner.setVisibility(View.GONE);
                    }
                });

        TextView txt = (TextView) imageLayout.findViewById(R.id.uilpv_tv);
        txt.setText(imTitlesStr[position]);

        ((ViewPager) view).addView(imageLayout, 0);
        return imageLayout;
    }

对于我的项目，这个解决方案完全按照预期的方式工作。

在Android中，动态地将TextView添加到ViewPager的ViewGroup

1 个答案: