我正在编写一个 Android 应用程序，使用Vr全景视图我知道在 VR 应用程序中有两种导航方式
- 使用纸板上的单个按钮作为点击
- 将长时间注视某物视为一次点击
我如何使用其中一个来实现导航，以便如果用户单击按钮 panoview 将跳到下一张图片？
以下是示例 Vr PanoramaView 代码
**
* A basic PanoWidget Activity to load panorama images from disk. It will load a test image by
* default. It can also load an arbitrary image from disk using:
* adb shell am start -a "android.intent.action.VIEW" \
* -n "com.google.vr.sdk.samples.simplepanowidget/.SimpleVrPanoramaActivity" \
* -d "/sdcard/FILENAME.JPG"
*
* To load stereo images, "--ei inputType 2" can be used to pass in an integer extra which will set
* VrPanoramaView.Options.inputType.
*/
public class SimpleVrPanoramaActivity extends Activity {
InputStream istr = null;
private static final String TAG = SimpleVrPanoramaActivity.class.getSimpleName();
/** Actual panorama widget. **/
private VrPanoramaView panoWidgetView;
/**
* Arbitrary variable to track load status. In this example, this variable should only be accessed
* on the UI thread. In a real app, this variable would be code that performs some UI actions when
* the panorama is fully loaded.
*/
public boolean loadImageSuccessful;
/** Tracks the file to be loaded across the lifetime of this app. **/
private Uri fileUri;
/** Configuration information for the panorama. **/
private Options panoOptions = new Options();
private ImageLoaderTask backgroundImageLoaderTask;
/**
* Called when the app is launched via the app icon or an intent using the adb command above. This
* initializes the app and loads the image to render.
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
// Make the source link clickable.
TextView sourceText = (TextView) findViewById(R.id.source);
sourceText.setText(Html.fromHtml(getString(R.string.source)));
sourceText.setMovementMethod(LinkMovementMethod.getInstance());
panoWidgetView = (VrPanoramaView) findViewById(R.id.pano_view);
panoWidgetView.setEventListener(new ActivityEventListener());
// Initial launch of the app or an Activity recreation due to rotation.
handleIntent(getIntent());
}
/**
* Called when the Activity is already running and it's given a new intent.
*/
@Override
protected void onNewIntent(Intent intent) {
Log.i(TAG, this.hashCode() + ".onNewIntent()");
// Save the intent. This allows the getIntent() call in onCreate() to use this new Intent during
// future invocations.
setIntent(intent);
// Load the new image.
handleIntent(intent);
}
/**
* Load custom images based on the Intent or load the default image. See the Javadoc for this
* class for information on generating a custom intent via adb.
*/
private void handleIntent(Intent intent) {
// Determine if the Intent contains a file to load.
if (Intent.ACTION_VIEW.equals(intent.getAction())) {
Log.i(TAG, "ACTION_VIEW Intent recieved");
fileUri = intent.getData();
if (fileUri == null) {
Log.w(TAG, "No data uri specified. Use \"-d /path/filename\".");
} else {
Log.i(TAG, "Using file " + fileUri.toString());
}
panoOptions.inputType = intent.getIntExtra("inputType", Options.TYPE_MONO);
Log.i(TAG, "Options.inputType = " + panoOptions.inputType);
} else {
Log.i(TAG, "Intent is not ACTION_VIEW. Using default pano image.");
fileUri = null;
panoOptions.inputType = Options.TYPE_MONO;
}
// Load the bitmap in a background thread to avoid blocking the UI thread. This operation can
// take 100s of milliseconds.
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));
}
@Override
protected void onPause() {
panoWidgetView.pauseRendering();
super.onPause();
}
@Override
protected void onResume() {
super.onResume();
panoWidgetView.resumeRendering();
}
@Override
protected void onDestroy() {
// Destroy the widget and free memory.
panoWidgetView.shutdown();
// The background task has a 5 second timeout so it can potentially stay alive for 5 seconds
// after the activity is destroyed unless it is explicitly cancelled.
if (backgroundImageLoaderTask != null) {
backgroundImageLoaderTask.cancel(true);
}
super.onDestroy();
}
/**
* Helper class to manage threading.
*/
class ImageLoaderTask extends AsyncTask<Pair<Uri, Options>, Void, Boolean> {
/**
* Reads the bitmap from disk in the background and waits until it's loaded by pano widget.
*/
@Override
protected Boolean doInBackground(Pair<Uri, Options>... fileInformation) {
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=new URL("https://s18.postimg.org/rnoymr5o9/andes.jpg").openStream();
//istr = assetManager.open("andes.jpg");
panoOptions = new Options();
panoOptions.inputType = 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;
}
}
try {
istr.close();
} catch (IOException e) {
Log.e(TAG, "Could not close input stream: " + e);
}
return true;
}
@Override
protected void onPostExecute(Boolean aBoolean) {
super.onPostExecute(aBoolean);
panoWidgetView.loadImageFromBitmap(BitmapFactory.decodeStream(istr), panoOptions);
}
}
/**
* Listen to the important events from widget.
*/
private class ActivityEventListener extends VrPanoramaEventListener {
/**
* Called by pano widget on the UI thread when it's done loading the image.
*/
@Override
public void onLoadSuccess() {
loadImageSuccessful = true;
}
/**
* Called by pano widget on the UI thread on any asynchronous error.
*/
@Override
public void onLoadError(String errorMessage) {
loadImageSuccessful = false;
Toast.makeText(
SimpleVrPanoramaActivity.this, "Error loading pano: " + errorMessage, Toast.LENGTH_LONG)
.show();
Log.e(TAG, "Error loading pano: " + errorMessage);
}
}
}
