问题：从查看传呼机保存图像 [英] Issue : Saving Image from View Pager

问题描述

我加载从服务器映像集和ViewPager显示。当我打保存按钮，接下来的图像保存到SD卡，而不是精确的图像。例如，如果我点击图片第3，第4影像被保存，如果我点击图片4，第5图像保存到SD卡。如何处理这个？

I'm loading set of images from server and displaying in ViewPager. When I hit Save button, the next image is saved to SD Card and not the exact image. For example, If i click 3rd image, 4th image is saved and if i click 4th image, 5th image is saved to SD card. How to handle this??

public class ImagePagerActivity extends ActionBarActivity {
ImageView imageView;
BitmapDrawable btmpDr;
private static final String STATE_POSITION = "STATE_POSITION";
@InjectView(R.id.pager)
ViewPager pager;
ActionBar actionBar;
 PagerAdapter pagerAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image_pager);
    ButterKnife.inject(this);
    actionBar = getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    Bundle bundle = getIntent().getExtras();
    int pagerPosition = bundle.getInt("position", 0);
    String[] imageUrls = bundle.getStringArray("images");


    if (savedInstanceState != null) {
        pagerPosition = savedInstanceState.getInt(STATE_POSITION);
    }
    pagerAdapter = new ImagePagerAdapter(imageUrls);
    pager.setAdapter(pagerAdapter);
    pager.setCurrentItem(pagerPosition);


}

@Override
public void onSaveInstanceState(Bundle outState) {
    outState.putInt(STATE_POSITION, pager.getCurrentItem());
}

public class ImagePagerAdapter extends PagerAdapter {

    public String[] images;
    private LayoutInflater inflater;

    ImagePagerAdapter(String[] images) {
        this.images = images;
        inflater = getLayoutInflater();
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }

    @Override
    public int getCount() {
        return images.length;
    }

    @Override
    public Object instantiateItem(ViewGroup view, int position) {
        View imageLayout = inflater.inflate(R.layout.item_pager_image,
                view, false);
        assert imageLayout != null;
        imageView = (ImageView) imageLayout
                .findViewById(R.id.image);

        Picasso.with(ImagePagerActivity.this).load(images[position]).into(imageView);
        view.addView(imageLayout, 0);
        return imageLayout;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view.equals(object);
    }

    @Override
    public void restoreState(Parcelable state, ClassLoader loader) {
    }

    @Override
    public Parcelable saveState() {
        return null;
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_image_pager, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_save:
            Bitmap bitmap;
            OutputStream output;
            BitmapDrawable btmpDr = (BitmapDrawable) imageView.getDrawable();
            bitmap = btmpDr.getBitmap();
            File filepath = Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
            File dir = new File(filepath.getAbsolutePath()
                    + "/Test Folder/");
            dir.mkdirs();
            Date d = new Date();
            CharSequence s = DateFormat
                    .format("dd-MM-yy hh-mm-ss", d.getTime());
            File file = new File(dir, s + ".png");
            Message.Toast(ImagePagerActivity.this, "Image Saved to SD Card");

            try {
                output = new FileOutputStream(file);
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, output);
                output.flush();
                output.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            break;
        case android.R.id.home:
            NavUtils.navigateUpTo(this, new Intent(this, GalleryActivity.class));
            break;
        default:
            break;
    }
    return super.onOptionsItemSelected(item);
}

}

推荐答案

尝试添加 file.createNewFile（）：

try {
                file.createNewFile(); //add here
                output = new FileOutputStream(file);
                bitmap.compress(Bitmap.CompressFormat.PNG, 100, output);
                output.flush();
                output.close();
            } catch (Exception e) {
                e.printStackTrace();
            }

这篇关于问题：从查看传呼机保存图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！