如何在Android中使縮略圖更大的圖像淋浴？

Question

我已經成功地開始閱讀圖像回到我的android應用程序到一個gridview，我現在需要幫助。當用戶點擊圖片時，我希望它從縮略圖看起來更大。任何幫助深表感謝。

我對圖像的代碼來獲取閱讀：

[代碼]

public class View_Pictures extends AppCompatActivity { 

public class ImageAdapter extends BaseAdapter { 

    private Context mContext; 
    ArrayList<String> itemList = new ArrayList<String>(); 

    public ImageAdapter(Context c) { 
     mContext = c; 
    } 

    void add(String path){ 
     itemList.add(path); 
    } 

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

    @Override 
    public Object getItem(int arg0) { 
     // TODO Auto-generated method stub 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return 0; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView imageView; 
     if (convertView == null) { // if it's not recycled, initialize some attributes 
      imageView = new ImageView(mContext); 
      imageView.setLayoutParams(new GridView.LayoutParams(220, 220)); 
      imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
      imageView.setPadding(8, 8, 8, 8); 
     } else { 
      imageView = (ImageView) convertView; 
     } 

     Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 220, 220); 

     imageView.setImageBitmap(bm); 
     return imageView; 
    } 

    public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) { 

     Bitmap bm = null; 
     // First decode with inJustDecodeBounds=true to check dimensions 
     final BitmapFactory.Options options = new BitmapFactory.Options(); 
     options.inJustDecodeBounds = true; 
     BitmapFactory.decodeFile(path, options); 

     // Calculate inSampleSize 
     options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); 

     // Decode bitmap with inSampleSize set 
     options.inJustDecodeBounds = false; 
     bm = BitmapFactory.decodeFile(path, options); 

     return bm; 
    } 

    public int calculateInSampleSize(

      BitmapFactory.Options options, int reqWidth, int reqHeight) { 
     // Raw height and width of image 
     final int height = options.outHeight; 
     final int width = options.outWidth; 
     int inSampleSize = 1; 

     if (height > reqHeight || width > reqWidth) { 
      if (width > height) { 
       inSampleSize = Math.round((float)height/(float)reqHeight); 
      } else { 
       inSampleSize = Math.round((float)width/(float)reqWidth); 
      } 
     } 

     return inSampleSize; 
    } 

} 

ImageAdapter myImageAdapter; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_view__pictures); 

    GridView gridview = (GridView) findViewById(R.id.gridview); 
    myImageAdapter = new ImageAdapter(this); 
    gridview.setAdapter(myImageAdapter); 

    String ExternalStorageDirectoryPath = Environment 
      .getExternalStorageDirectory() 
      .getAbsolutePath(); 

    String targetPath = ExternalStorageDirectoryPath + "/Venns Road Accident"; 

    Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG).show(); 
    File targetDirector = new File(targetPath); 

    File[] files = targetDirector.listFiles(); 
    for (File file : files){ 
     myImageAdapter.add(file.getAbsolutePath()); 
    } 
} 
} 

的GridView

<GridView 
    android:id="@+id/gridview" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_below="@id/textView47" 
    android:columnWidth="90dp" 
    android:numColumns="auto_fit" 
    android:verticalSpacing="10dp" 
    android:horizontalSpacing="10dp" 
    android:stretchMode="columnWidth" 
    android:gravity="center"/> 

Answer 1

你可以使用它是用來顯示在單獨的完整細節圖像photoviwer庫活動。

// Any implementation of ImageView can be used! 
mImageView = (ImageView) findViewById(R.id.iv_photo); 

// Set the Drawable displayed 
Drawable bitmap = getResources().getDrawable(R.drawable.wallpaper); 
// or 
// get your bitmap here 
mImageView.setImageDrawable(bitmap); 

// Attach a PhotoViewAttacher, which takes care of all of the zooming functionality. 
// (not needed unless you are going to change the drawable later) 
mAttacher = new PhotoViewAttacher(mImageView); 

請參考以下鏈接

https://github.com/chrisbanes/PhotoView