Java ViewPager.setSystemUiVisibility方法代碼示例

import android.support.v4.view.ViewPager; //導入方法依賴的package包/類
@TargetApi(VERSION_CODES.HONEYCOMB)
@Override
public void onCreate(Bundle savedInstanceState) {
    if (BuildConfig.DEBUG) {
        Utils.enableStrictMode();
    }
    super.onCreate(savedInstanceState);
    setContentView(R.layout.image_detail_pager);

    // Fetch screen height and width, to use as our max size when loading images as this
    // activity runs full screen
    final DisplayMetrics displayMetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
    final int height = displayMetrics.heightPixels;
    final int width = displayMetrics.widthPixels;

    // For this sample we'll use half of the longest width to resize our images. As the
    // image scaling ensures the image is larger than this, we should be left with a
    // resolution that is appropriate for both portrait and landscape. For best image quality
    // we shouldn't divide by 2, but this will use more memory and require a larger memory
    // cache.
    final int longest = (height > width ? height : width) / 2;

    ImageCache.ImageCacheParams cacheParams =
            new ImageCache.ImageCacheParams(this, IMAGE_CACHE_DIR);
    cacheParams.setMemCacheSizePercent(0.25f); // Set memory cache to 25% of app memory

    // The ImageFetcher takes care of loading images into our ImageView children asynchronously
    mImageFetcher = new ImageFetcher(this, longest);
    mImageFetcher.addImageCache(getSupportFragmentManager(), cacheParams);
    mImageFetcher.setImageFadeIn(false);

    // Set up ViewPager and backing adapter
    mAdapter = new ImagePagerAdapter(getSupportFragmentManager(), Images.imageUrls.length);
    mPager = (ViewPager) findViewById(R.id.pager);
    mPager.setAdapter(mAdapter);
    mPager.setPageMargin((int) getResources().getDimension(R.dimen.horizontal_page_margin));
    mPager.setOffscreenPageLimit(2);

    // Set up activity to go full screen
    getWindow().addFlags(LayoutParams.FLAG_FULLSCREEN);

    // Enable some additional newer visibility and ActionBar features to create a more
    // immersive photo viewing experience
    if (Utils.hasHoneycomb()) {
        final ActionBar actionBar = getActionBar();

        // Hide title text and set home as up
        actionBar.setDisplayShowTitleEnabled(false);
        actionBar.setDisplayHomeAsUpEnabled(true);

        // Hide and show the ActionBar as the visibility changes
        mPager.setOnSystemUiVisibilityChangeListener(
                new View.OnSystemUiVisibilityChangeListener() {
                    @Override
                    public void onSystemUiVisibilityChange(int vis) {
                        if ((vis & View.SYSTEM_UI_FLAG_LOW_PROFILE) != 0) {
                            actionBar.hide();
                        } else {
                            actionBar.show();
                        }
                    }
                });

        // Start low profile mode and hide ActionBar
        mPager.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
        actionBar.hide();
    }

    // Set the current item based on the extra passed in to this activity
    final int extraCurrentItem = getIntent().getIntExtra(EXTRA_IMAGE, -1);
    if (extraCurrentItem != -1) {
        mPager.setCurrentItem(extraCurrentItem);
    }
}