Android:如何将从库中选择的照片设置为位图

Question

我要求用户通过代码作为监听器访问图库:

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, SELECT_PHOTO);

但是,我对如何将变量设置为所选照片感到困惑.

在选择照片时,我会将代码放在哪里设置变量？

谢谢 :)

Answer 1

首先,您必须覆盖onActivityResult以获取文件所选图像的uri

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == SELECT_PHOTO) {

        if (resultCode == RESULT_OK) {
            if (intent != null) {
                // Get the URI of the selected file
                final Uri uri = intent.getData();
                useImage(uri);                   
              }
        }
       super.onActivityResult(requestCode, resultCode, intent);

    }
}

然后定义useImage(Uri)使用图像

void useImage(Uri uri)
{
 Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
 //use the bitmap as you like
 imageView.setImageBitmap(bitmap);
}

Answer 2

你可以这样做.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    // Here we need to check if the activity that was triggers was the Image Gallery.
    // If it is the requestCode will match the LOAD_IMAGE_RESULTS value.
    // If the resultCode is RESULT_OK and there is some data we know that an image was picked.
    if (requestCode == LOAD_IMAGE_RESULTS && resultCode == RESULT_OK && data != null) {
        // Let's read picked image data - its URI
        Uri pickedImage = data.getData();
        // Let's read picked image path using content resolver
        String[] filePath = { MediaStore.Images.Media.DATA };
        Cursor cursor = getContentResolver().query(pickedImage, filePath, null, null, null);
        cursor.moveToFirst();
        String imagePath = cursor.getString(cursor.getColumnIndex(filePath[0]));

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bitmap = BitmapFactory.decodeFile(imagePath, options);

         // Do something with the bitmap


        // At the end remember to close the cursor or you will end with the RuntimeException!
        cursor.close();
    }
}