无法在ImageView中显示图像

Question

我从图库中选取图像并在ImageView上显示图像。我能够成功地做到这一点。我的问题是，当我尝试设置从相机捕获的图像（.jpg图像）时，它们不会在imageview中显示，只是出现一个空白屏幕。即使成功显示.jpg类型的图像，也不会从相机捕获。无法理解的原因，可能是由于尺寸较大。请帮助 以下是我的代码：提前

Answer 1

你需要使用的FileInputStream和的BufferedInputStream读取图像

public class ImagePick extends Activity { 

private Bitmap bitmap; 
private ImageView imv; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 

setContentView(R.layout.activity_upload); 
imv = (ImageView) findViewById(R.id.targetimage); 

    Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
    intent.setType("image/*"); 
    startActivityForResult(intent, 0); 

} 


protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) { 
    super.onActivityResult(requestCode, resultCode, imageReturnedIntent); 

    switch(requestCode) { 
    case 0: 
     if(resultCode == RESULT_OK){ 
      Uri selectedImage = imageReturnedIntent.getData(); 
      String[] filePathColumn = {MediaStore.Images.Media.DATA}; 

      Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null); 
      cursor.moveToFirst(); 

      int columnIndex = cursor.getColumnIndex(filePathColumn[0]); 
      String filePath = cursor.getString(columnIndex); // file path of selected image 
      cursor.close(); 
        // Convert file path into bitmap image using below line. 
      Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath); 

        // put bitmapimage in your imageview 
      imv.setImageBitmap(yourSelectedImage); 
     } 
    } 
} 
} 

感谢那么你将图像转换为位图。

private FileInputStream is = null; 
    private BufferedInputStream bis = null; 


is = new FileInputStream(new File(imagePath)); 
     bis = new BufferedInputStream(is); 

还要检查link

感谢

Answer 2

相反的：

int columnIndex = cursor.getColumnIndex(filePathColumn[0]); 
String filePath = cursor.getString(columnIndex); // file path of selected image 

尝试：

int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
cursor.moveToFirst(); 
return cursor.getString(column_index); 

和关闭游标之后的BitmapDecoding。

请记住，访问SD卡应该在AsynckTasks中完成。你可以调整图像大小以适应屏幕，这样你就不会占用大量的内存，看看我的其他答案Bitmap Out Of Memory Issues。如何做到这一点。