android - 将从图库中选取的图像传输到另一个 Activity

Question

我正在尝试将由画廊或相机选择的 m 图像发送到另一个 Activity ，但似乎没有任何反应，我已将位图转换为字符串以通过 Intent 发送它，但似乎从未调用 Intent .

请帮我看看我做错了什么？

这是我的 onActivityResult() 代码

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            Bitmap thumbnail = null;
            if(requestCode==RESULT_LOAD_IMAGE){
               if(resultCode==RESULT_OK){

                    Uri selectedImageUri = data.getData();
                    String[] filePathColumn = { MediaStore.Images.Media.DATA };
                    Cursor cursor = getContentResolver().query(selectedImageUri,filePathColumn, null, null, null);
                    cursor.moveToFirst();
                    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                    String picturePath = cursor.getString(columnIndex);
                    cursor.close();
                    data.getExtras().get("data");

                    thumbnail = (BitmapFactory.decodeFile(picturePath));

                    //CONVERT BITMAP TO STRING
                    ByteArrayOutputStream baos=new  ByteArrayOutputStream();
                    thumbnail.compress(Bitmap.CompressFormat.PNG,100, baos);
                    byte [] b=baos.toByteArray();
                    String temp=Base64.encodeToString(b, Base64.DEFAULT);
                        //trying to start activity...

                    Intent intent = new Intent(Home.this, Upload.class);
                    intent.putExtra("picture", temp);
                    startActivity(intent);}

                }
            }

            }

Answer 1

为什么不将图像转换为字符串，为什么不使用文件路径并在其他 Activity 中重新加载它呢？我的应用程序遇到了同样的问题 Pic4Share我就这样解决了。

在从图库加载图像的 Activity 中:

String stringPath;

protected void onActivityResult(int requestCode, int resultCode,Intent imageReturnedIntent) {
        super.onActivityResult(requestCode, resultCode, imageReturnedIntent); 
        switch(requestCode) { 
            case SELECT_PHOTO:
                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]);
                    stringPath = cursor.getString(columnIndex); // ***Here is stored the path***
                    cursor.close();

                    BitmapFactory.Options opts = new BitmapFactory.Options ();
                    opts.inSampleSize = 4;   // for 1/2 the image to be loaded
                    opts.inPurgeable = true;

                    image.setImageBitmap(decodeSampledBitmapFromFile(txtPath, 800, 800));

                }
                else{
                    //Toast.makeText(getApplicationContext(),"Error", Toast.LENGTH_SHORT).show();
                }
            }
        }
    }

然后您可以使用 intent 传递带有路径的字符串:

Intent intent = new Intent(Home.this, Upload.class);
Bundle b = new Bundle();
b.putString("picture", stringPath);
intent.putExtras(b);
startActivity(intent);

最后，在您的其他应用程序中，您使用路径再次加载图片:

Bundle b = getIntent().getExtras();
String picturePath = b.getString("picture");
Bitmap scaledBitmap = decodeSampledBitmapFromFile(picturePath, 150, 150);