在ImageView上更改圖像方向從圖庫中提取並上傳

Question

我只是想從圖庫中獲取圖像並上載，然後從服務器上下載，並將其設置在Activity上的ImageView上。圖像視圖位於活動的中心。所有工作都很好，只是一個screenOrientation變化問題，從服務器獲取ImageView後調整ImageView，下載並設置爲圖像視圖。請看看代碼我用什麼來從服務器下載圖像位圖，並將其設置爲所需的ImageView。它通常顯示旋轉後的圖像，以便從人像攝影機或相機拍攝肖像。請讓我知道，如果我錯過了我的代碼中的任何東西。

package com.fedorvlasov.lazylist; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.util.Collections; 
import java.util.Map; 
import java.util.WeakHashMap; 
import java.util.concurrent.ExecutorService; 
import java.util.concurrent.Executors; 
import com.example.qlique.R; 
import android.os.Handler; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.widget.ImageView; 

public class ImageLoader { 
    MemoryCache memoryCache = new MemoryCache(); 
    FileCache fileCache; 
    private Map<ImageView, String> imageViews = Collections 
      .synchronizedMap(new WeakHashMap<ImageView, String>()); 
    ExecutorService executorService; 
    Handler handler = new Handler();// handler to display images in UI thread 

    public ImageLoader(Context context) { 
     fileCache = new FileCache(context); 
     executorService = Executors.newFixedThreadPool(5); 
    } 

    final int stub_id = R.drawable.stub; 

    public void DisplayImage(String url, ImageView imageView) { 
     imageViews.put(imageView, url); 
     Bitmap bitmap = memoryCache.get(url); 
     if (bitmap != null) 
      imageView.setImageBitmap(bitmap); 
     else { 
      queuePhoto(url, imageView); 
      imageView.setImageResource(stub_id); 
     } 
    } 

    private void queuePhoto(String url, ImageView imageView) { 
     PhotoToLoad p = new PhotoToLoad(url, imageView); 
     executorService.submit(new PhotosLoader(p)); 
    } 

    private Bitmap getBitmap(String url) { 
     File f = fileCache.getFile(url); 

     // from SD cache 
     Bitmap b = decodeFile(f); 
     if (b != null) 
      return b; 

     // from web 
     try { 
      Bitmap bitmap = null; 
      URL imageUrl = new URL(url); 
      HttpURLConnection conn = (HttpURLConnection) imageUrl 
        .openConnection(); 
      conn.setConnectTimeout(30000); 
      conn.setReadTimeout(30000); 
      conn.setInstanceFollowRedirects(true); 
      InputStream is = conn.getInputStream(); 
      OutputStream os = new FileOutputStream(f); 
      Utils.CopyStream(is, os); 
      os.close(); 
      conn.disconnect(); 
      bitmap = decodeFile(f); 
      return bitmap; 
     } catch (Throwable ex) { 
      ex.printStackTrace(); 
      if (ex instanceof OutOfMemoryError) 
       memoryCache.clear(); 
      return null; 
     } 
    } 

    // decodes image and scales it to reduce memory consumption 
    private Bitmap decodeFile(File f) { 
     try { 
      // decode image size 
      BitmapFactory.Options o = new BitmapFactory.Options(); 
      o.inJustDecodeBounds = true; 
      FileInputStream stream1 = new FileInputStream(f); 
      BitmapFactory.decodeStream(stream1, null, o); 
      stream1.close(); 

      // Find the correct scale value. It should be the power of 2. 
      final int REQUIRED_SIZE = 70; 
      int width_tmp = o.outWidth, height_tmp = o.outHeight; 
      int scale = 1; 
      while (true) { 
       if (width_tmp/2 < REQUIRED_SIZE 
         || height_tmp/2 < REQUIRED_SIZE) 
        break; 
       width_tmp /= 2; 
       height_tmp /= 2; 
       scale *= 2; 
      } 

      // decode with inSampleSize 
      BitmapFactory.Options o2 = new BitmapFactory.Options(); 
      o2.inSampleSize = scale; 
      FileInputStream stream2 = new FileInputStream(f); 
      Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2); 
      stream2.close(); 
      return bitmap; 
     } catch (FileNotFoundException e) { 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

    // Task for the queue 
    private class PhotoToLoad { 
     public String url; 
     public ImageView imageView; 

     public PhotoToLoad(String u, ImageView i) { 
      url = u; 
      imageView = i; 
     } 
    } 

    class PhotosLoader implements Runnable { 
     PhotoToLoad photoToLoad; 

     PhotosLoader(PhotoToLoad photoToLoad) { 
      this.photoToLoad = photoToLoad; 
     } 

     @Override 
     public void run() { 
      try { 
       if (imageViewReused(photoToLoad)) 
        return; 
       Bitmap bmp = getBitmap(photoToLoad.url); 
       memoryCache.put(photoToLoad.url, bmp); 
       if (imageViewReused(photoToLoad)) 
        return; 
       BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad); 
       handler.post(bd); 
      } catch (Throwable th) { 
       th.printStackTrace(); 
      } 
     } 
    } 

    boolean imageViewReused(PhotoToLoad photoToLoad) { 
     String tag = imageViews.get(photoToLoad.imageView); 
     if (tag == null || !tag.equals(photoToLoad.url)) 
      return true; 
     return false; 
    } 

    // Used to display bitmap in the UI thread 
    class BitmapDisplayer implements Runnable { 
     Bitmap bitmap; 
     PhotoToLoad photoToLoad; 

     public BitmapDisplayer(Bitmap b, PhotoToLoad p) { 
      bitmap = b; 
      photoToLoad = p; 
     } 

     public void run() { 
      if (imageViewReused(photoToLoad)) 
       return; 
      if (bitmap != null) 
       photoToLoad.imageView.setImageBitmap(bitmap); 
      else 
       photoToLoad.imageView.setImageResource(stub_id); 
     } 
    } 

    public void clearCache() { 
     memoryCache.clear(); 
     fileCache.clear(); 
    } 
} 

Answer 1

首先檢查一個圖像

public static int getExifOrientation(String filepath) { 
       int degree = 0; 
       ExifInterface exif = null; 
       try { 
         exif = new ExifInterface(filepath); 
       } catch (IOException ex) { 
         ex.printStackTrace(); 
       } 
       if (exif != null) { 
         int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1); 
         if (orientation != -1) { 
           // We only recognise a subset of orientation tag values. 
           switch (orientation) { 
           case ExifInterface.ORIENTATION_ROTATE_90: 
             degree = 90; 
             break; 
           case ExifInterface.ORIENTATION_ROTATE_180: 
             degree = 180; 
             break; 
           case ExifInterface.ORIENTATION_ROTATE_270: 
             degree = 270; 
             break; 
           } 

         } 
       } 

       return degree; 
     } 

的Orientation和位圖的角度旋轉到那種程度。

Bitmap bitmap = YOUR_BITMAP; 
    //rotate bitmap 
    Matrix matrix = new Matrix();    
    matrix.postRotate(orientation); 
    //create new rotated bitmap 
    bitmap = Bitmap.createBitmap(bitmap, 0, 0,bitmap.getWidth(), bitmap.getHeight(), matrix, true); 
    YOUR_IMAGE_VIEW.setImageBitmap(bitmap);