Android开发中Google VR全景的实现

VR在现在生活中已经随处可见,在移动端上的应用更是屡见不鲜,在android 开发中VR更是应用在多个领域,汽车、家装、景区等,下面我就使用google的vr-sdk简单实现全景:

1.效果图如下:

2.引入vr-sdk

  compile 'com.google.vr:sdk-panowidget:1.80.0'

我用的是google的最新版的,后续可能还会有更新

3.layout中布局控件的引入

    <com.google.vr.sdk.widgets.pano.VrPanoramaView
        android:id="@+id/pano_view"
        android:layout_width="match_parent"
        android:scrollbars="@null"
        android:layout_height="match_parent"/>

4.加载并展示图片

在加载的时候设置加载事件监听

        vrPanoramaView.setEventListener(new ActivityEventListener());

其中view的方法如下所示:这里只列出了一些在demo图片加载我采用的是从assets中进行异步加载,如果在实际开发中基本上都是从网络中加载的

//        vrPanoramaView.setFullscreenButtonEnabled (false); //隐藏全屏模式按钮
//        vrPanoramaView.setInfoButtonEnabled(false); //设置隐藏最左边信息的按钮
//        vrPanoramaView.setStereoModeButtonEnabled(false); //设置隐藏立体模型的按钮
//        vrPanoramaView.setEventListener(new ActivityEventListener()); //设置监听
//        panoOptions.inputType = VrPanoramaView.Options.TYPE_MONO;
//        //加载本地的图片源
//        vrPanoramaView.loadImageFromBitmap(BitmapFactory.decodeStream(istr), panoOptions);
   //其中type_MONO源码中有四种分别是
        private static final int TYPE_START_MARKER = 0;
        public static final int TYPE_MONO = 1;
        public static final int TYPE_STEREO_OVER_UNDER = 2;
        private static final int TYPE_END_MARKER = 3;
//在这里因为用到左右眼VR 所以用单声道模式,
//图片中其中有上下两张图片,戴上全景设备之后分别能在 左右眼中分别看到
//如果是单张的全景图片就用TYPE_STEREO_OVER_UNDER =2就可以 

ActivityEventListener的实现如下:


    public class ActivityEventListener extends VrPanoramaEventListener {
        @Override
        public void onLoadSuccess() {
            loadImageSuccessful = true;
        }
        @Override
        public void onLoadError(String errorMessage) {
            loadImageSuccessful=false;
            Toast.makeText(MainActivity.this, errorMessage, Toast.LENGTH_SHORT).show();
        }
    }

这里只是对加载状态做一个toast,读者可以进行自定义这些
进行异步加载图片,避免堵塞UI线程

      if (backgroundImageLoaderTask != null) {
            // Cancel any task from a previous intent sent to this activity.
            backgroundImageLoaderTask.cancel(true);
        }
        backgroundImageLoaderTask = new ImageLoaderTask();
        backgroundImageLoaderTask.execute(Pair.create(fileUri, panoOptions));

具体加载过程如下:

      public class ImageLoaderTask extends AsyncTask<Pair<Uri, VrPanoramaView.Options>, Void, Boolean> {

            @Override
            protected Boolean doInBackground(Pair... fileInformation) {
                VrPanoramaView.Options panoOptions = null;  // It's safe to use null VrPanoramaView.Options.
                InputStream istr = null;
                if (fileInformation == null || fileInformation.length < 1
                        || fileInformation[0] == null || fileInformation[0].first == null) {
                    AssetManager assetManager = getAssets();
                    try {
                        istr = assetManager.open("1110.jpg");
                        panoOptions = new VrPanoramaView.Options();
                        panoOptions.inputType = VrPanoramaView.Options.TYPE_STEREO_OVER_UNDER;
                    } catch (IOException e) {
                        Log.e(TAG, "Could not decode default bitmap: " + e);
                        return false;
                    }
                } else {
                    try {
                        istr = new FileInputStream(new File(fileInformation[0].first.getPath()));
                        panoOptions = fileInformation[0].second;
                    } catch (IOException e) {
                        Log.e(TAG, "Could not load file: " + e);
                        return false;
                    }
                }

                vrPanoramaView.loadImageFromBitmap(BitmapFactory.decodeStream(istr), panoOptions);
                try {
                    istr.close();
                } catch (IOException e) {
                    Log.e(TAG, "Could not close input stream: " + e);
                }

                return true;
            }
        }

5.结束语

github-demo下载地址

如果对以上有疑问,或者是想交流的小伙伴们可以加QQ群:570650538

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