Android 从viewpager获取imageview以从按钮保存和共享

我有一张picasa的图片列表。我把它放在网格视图中，然后点击查看页面完成的全屏图像。我尝试了很多方法从视图寻呼机适配器获取位图或imageview，但它给出的是null。请帮帮我，我是新来的，这是我的第一个应用，我很困惑。 这是我的代码：

package com.example.soha.livingroom;
    public class fullimafepager   extends Activity implements OnClickListener {

  //  TouchImageView imgflag;
   // BitmapDrawable btmpDr;
    private static final String STATE_POSITION = "STATE_POSITION";
  //  @InjectView(R.id.pager)
LruBitmapCache lreucach;

    private PrefManager prefmanger;
    private List<String> images = new ArrayList<String>();
    private String imageuri;

    // Picasa JSON response node keys

    // Declare Variables
    private  ViewPager viewPager;
    private ImageAdapter adapter;
private int npostion;
  //  private Bitmap[] image2;

    private int position;

    // private im selectedPhoto;
    private LinearLayout llSetWallpaper, llDownloadWallpaper;
    private Utils utils;
    private ProgressBar pbLoader;
    private View view;

private Bitmap bitmap;
    private ImageView fullImageView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Get the view from viewpager_main.xml
        prefmanger = new PrefManager(getApplicationContext());
        setContentView(R.layout.viewpager_main);
        if (getIntent().getExtras() != null) {
            this.images = getIntent().getExtras().getStringArrayList("list");
            position = getIntent().getIntExtra("postion", 0);
            ;
            // fullImageView= images.get(position);
            Log.d("=======", "Data " + images.get(1));

            Toast.makeText(this, "the" + images.get(1) + position, Toast.LENGTH_LONG).show();
            //   Intent i = getIntent();
            // image selectedPhoto = (image) getIntent().getSerializableExtra(TAG_SEL_IMAGE);
            //   System.out.println(images);

        }

        prefmanger = new PrefManager(getApplicationContext());


        // Generate sample data

        // flag = new int[] { R.drawable.ico_loader, R.drawable.ico_loader, R.drawable.ico_loader, R.drawable.ico_loader};

        // Locate the ViewPager in viewpager_main.xml
        viewPager = (ViewPager) findViewById(R.id.pager);
        // Pass results to ViewPagerAdapter Class
        adapter = new ImageAdapter(fullimafepager.this, images);
        // Binds the Adapter to the ViewPager
        viewPager.setAdapter(adapter);
        // viewPager.setCurrentItem(0);

        viewPager.setCurrentItem(position);
        Log.d("test", "Current Page:"+viewPager.getCurrentItem());
      //  fullImageView= (ImageView) viewPager.getChildAt(position);
        npostion= viewPager.getCurrentItem();
 // fullImageView= (TouchImageView) viewPager.findViewById(R.id.imgFullscreen);
       fullImageView= (TouchImageView) viewPager.findViewWithTag("pos" + viewPager.getCurrentItem());
        Log.d("test", "Current uri:" + fullImageView);
      //  Log.d("test", "Current Page:"+npostion);
    //    view     = fullimafepager.viewPager.getChildAt(fullimafepager.viewPager.getCurrentItem()).getRootView();
      //   fullImageView = (ImageView)fullimafepager.viewPager.findViewWithTag("myview" + fullimafepager.viewPager.getCurrentItem());

      //  Log.d("=======", "Data " + fullImageView);
        //addition
     //   imageUri = images.get(npostion);

       //  uri = Uri.parse(imageUri);
      //  imageuri=images.get(npostion);
       // bitmap=lreucach.getBitmap(imageuri);
        llSetWallpaper = (LinearLayout) findViewById(R.id.llSetWallpaper);
        llDownloadWallpaper = (LinearLayout) findViewById(R.id.llDownloadWallpaper);
        pbLoader = (ProgressBar) findViewById(R.id.pbLoader);
        // hide the action bar in fullscreen mode
        //  fullImageView = (ImageView) findViewById(R.id.imgFullscreen);
    //    getActionBar().hide();

    //    utils = new Utils(getApplicationContext());

        // layout click listeners
      llSetWallpaper.setOnClickListener(this);
        llDownloadWallpaper.setOnClickListener(this);


        // setting layout buttons alpha/opacity
        llSetWallpaper.getBackground().setAlpha(70);
        llDownloadWallpaper.getBackground().setAlpha(70);
    }


        @Override
        public void onClick(View v) {
            Bitmap bitmap = ((BitmapDrawable) fullImageView.getDrawable())
                    .getBitmap();
         //  Bitmap bitmap = ((BitmapDrawable) imgflag.getBitmap();
         /*   Bitmap bitmap1= null;
            try {
                bitmap1 = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse(imageuri));
            } catch (IOException e) {
                e.printStackTrace();
            }*/

            Log.d("test", "Current uri:" + bitmap);
            switch (v.getId()) {

                case R.id.llDownloadWallpaper:
                 //  utils.saveImageToSDCard(bitmap);
                {   File myDir = new File(
                            Environment
                                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                            prefmanger.getGalleryName());

                    myDir.mkdirs();
                    Random generator = new Random();
                    int n = 10000;
                    n = generator.nextInt(n);
                    String fname = "Wallpaper-" + n + ".jpg";
                    File file = new File(myDir, fname);
                    if (file.exists())
                        file.delete();
                    try {
                        FileOutputStream out = new FileOutputStream(file);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
                        out.flush();
                        out.close();
                        Toast.makeText(
                                fullimafepager.this,
                                fullimafepager.this.getString(R.string.toast_saved).replace("#",
                                        "\"" + prefmanger.getGalleryName() + "\""),
                                Toast.LENGTH_SHORT).show();
                   //     Log.d(this, "Wallpaper saved to: " + file.getAbsolutePath());

                    } catch (Exception e) {
                        e.printStackTrace();
                        Toast.makeText(fullimafepager.this,
                                fullimafepager.this.getString(R.string.toast_saved_failed),
                                Toast.LENGTH_SHORT).show();}}
                    break;
                // button Set As Wallpaper tapped
                case R.id.llSetWallpaper:
                    //  utils.shareIt(bitmap);
                {  /*Intent share = new Intent(Intent.ACTION_SEND);
                share.setType("image/*");
                ByteArrayOutputStream bytes = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
                File f = new File(Environment.getExternalStorageDirectory() + File.separator + "temporary_file.jpg");
                try {
                    f.createNewFile();
                    FileOutputStream fo = new FileOutputStream(f);
                    fo.write(bytes.toByteArray());
                } catch (IOException e) {
                    e.printStackTrace();
                }
               // share.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                share.putExtra(Intent.EXTRA_STREAM, Uri.parse("file:///sdcard/temporary_file.jpg"));
                startActivity(Intent.createChooser(share, "Share Image"));*/
                  Intent share = new Intent(Intent.ACTION_SEND);
                    share.setType("image/jpeg");

                    ContentValues values = new ContentValues();
                    values.put(MediaStore.Images.Media.TITLE, "title");
                    values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
                 Uri  uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                            values);


                    OutputStream outstream;
                    try {
                        outstream = getContentResolver().openOutputStream(uri);
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outstream);
                        outstream.close();
                    } catch (Exception e) {
                        System.err.println(e.toString());
                    }

                    share.putExtra(Intent.EXTRA_STREAM, uri);
                    startActivity(Intent.createChooser(share, "Share Image"));
                }
                break;
                default:
                    break;
            }

        }



/**
 * @author Terry E-mail: yaoxinghuo at 126 dot com
 * @version create: 2010-10-21 ??01:40:03
 */

   }

这是我的适配器

public class ImageAdapter extends  PagerAdapter {
    private  Activity _activity;
    // Declare Variables
    Context context;
    Utils utiles;
    TouchImageView imgflag;
    LruBitmapCache lreucach;
  private List<String> image2;
  private   LayoutInflater inflater;
private  Bitmap bitmap;
    //new
    private image selectedPhoto;

    public ImageAdapter(Activity activity,
                        List<String> flag) {

        this._activity = activity;

        this.image2 = flag;
    }

    @Override
    public int getCount() {
        return this.image2.size();
    }

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

    @Override
    public Object instantiateItem(ViewGroup container, int postion) {

        // Declare Variables



        inflater = (LayoutInflater) _activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View itemView = inflater.inflate(R.layout.activity_fullscreen_image, container,
                false);
        imgflag = (TouchImageView)  itemView.findViewById(R.id.imgFullscreen);

    //    fullImageView.setOnTouchListener(this);



        // Capture position and set to the ImageView
     Picasso.with(_activity).load(image2.get(postion)).into(imgflag);

        imgflag.setTag("pos" + postion);
       // imgflag.setImageURI(Uri.parse("http:/i.dailymail.co.uk/i/pix/2014/0‌​9/27/1411832985119_Puff_Image_galleryImage_SUNDERLAND_ENGLAND_SEPTEM.JPG"));
     /*   Uri imgUri = Uri.parse(image2.get(postion));
       imgflag.setImageURI(null);
       imgflag.setImageURI(imgUri);
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bitmap = BitmapFactory.decodeFile(image2.get(postion), options);
            imgflag.setImageBitmap(bitmap);*/

    //     bitmap = ((BitmapDrawable) imgflag.getDrawable()).getBitmap();;
     //   Bitmap bitmap;
       // OutputStream output;

       //  utiles.setBitmap();
        // Add viewpager_item.xml to ViewPager
                ((ViewPager) container).addView(imgflag);

      //   lreucach.putBitmap(image2.get(postion),bitmap);
        Log.d("test", "Adapter creating item:" + postion);
        return imgflag;
    }
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        // Remove viewpager_item.xml from ViewPager

        ((ViewPager) container).removeView((TouchImageView) object);
    }

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

    @Override
    public Parcelable saveState() {
        return null;
    }
    public Bitmap getBtmap(){
        BitmapDrawable btmpDr = (BitmapDrawable) imgflag.getDrawable();
        bitmap = btmpDr.getBitmap();
        return bitmap;
    }

---

欢迎来到SO！请花些时间阅读如何在这里创建一个好的代码示例：如果您想将图像另存为位图，或者您想共享图像，那么您应该拥有图像的直接链接。我是说.jpg或.png链接。如果您能详细说明，我将帮助您：