如何显示图像的全尺寸？

Question

我在这里是新手，在编程Android时也是新手。我在网上找到这个例子（下面是例子），这是一个很棒的教程！我想要实现的是当我点击GridView上的一张图片时，我想显示图片的完整大小。

public class MainActivity extends Activity { 

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 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

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

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

    String targetPath = ExternalStorageDirectoryPath + "/test/"; 

    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()); 
    } 
} 

} 

Answer 1

将图像传递给其他活动以在全视野中显示。

从您的主要活动传递图像。使用下面的代码：

gridview.setOnItemClickListener(new OnItemClickListener() { 
      public void onItemClick(AdapterView<?> parent, View v, 
        int position, long id) { 

ImageView img = ia.getView(position, v, parent); 
       img.buildDrawingCache(); 
       Bitmap bmap = img.getDrawingCache(); 
       Intent intent = new Intent(HelloGridView.this, 
         Imageviewer.class); 
       Bundle bundle = new Bundle(); 
       //bundle.putParcelable("image", bmap); 
        String par=myimageadpter.getpath(position); 
          bundle.putParcelable("imagepath", par); 
       intent.putExtras(bundle); 
       startActivityForResult(intent, 0); 

      } 
     }); 

在其他活动中使用此代码来显示图像传递：

Bundle bundle = this.getIntent().getExtras(); 
      bmp=bundle.getParcelable("image"); 
      ImageView img=(ImageView) findViewById(R.id.imageView1); 
      d =new BitmapDrawable(bmp); 
      img.setImageBitmap(bmp); 

如果传递路径。第二项活动是这样的：

Bundle bundle = this.getIntent().getExtras(); 

String s=bundle.getParcelable("imagepath"); 
Bitmap Imagefrompath = BitmapFactory.decodeFile(s); 
      ImageView img=(ImageView) findViewById(R.id.imageView1); 

      img.setImageBitmap(Imagefrompath);