Question

您好我正在制作Android应用程序，我制作了一个表格，将所有数据成功添加到mysql服务器中。我添加了一个按钮来上传图像并在onActivityResult上成功获取该图像，但是当我尝试在onActivityResult外部调用ImagePath（String）时，它总是返回null。我认为这是因为Fragment。

public class Registration_Fragment extends Fragment implements View.OnClickListener {

EditText First_Name;
EditText Last_Name;
EditText Phone_Number;
EditText Email_Address;
EditText Password;
ImageView PreviewImage;
Button Submit;
Button Upload;

Uri imageNameURL;
Bitmap bitmap;
String ImagePath;



@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view=inflater.inflate(R.layout.reg_fragment,container,false);
    First_Name= (EditText) view.findViewById(R.id.first_Name);
    Last_Name= (EditText)  view.findViewById(R.id.last_Name);
    Phone_Number= (EditText)  view.findViewById(R.id.phone);
    Email_Address= (EditText)  view.findViewById(R.id.mailID);
    Password= (EditText)  view.findViewById(R.id.password);
    PreviewImage= (ImageView) view.findViewById(R.id.Image_Preview);
    Submit= (Button) view.findViewById(R.id.Submit);
    Upload= (Button) view.findViewById(R.id.Uploader);

    Submit.setOnClickListener(this);
    Upload.setOnClickListener(this);    

    return view;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);    
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);    
}    

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.Submit:
            Log.d("Registration Fragment","Submit Button Pressed");
            Intent AllData=new Intent(getActivity(),DemoScreen3.class);

            //Now Collect Form Data 

            String First=First_Name.getText().toString();
            String Last=Last_Name.getText().toString();
            String Phone=Phone_Number.getText().toString();
            String Mail=Email_Address.getText().toString();
            String Pass=Password.getText().toString();


            if (ImagePath!=null){
                Log.d("REGI-ON CLICK==========",ImagePath);
            }
            else {
                Log.d("REGI-ON CLICK==========","Cannot Find ImagePath");// THIS LOG ALWAYS CALLED 
            }

//AYSYNC TASK CALLING FROM FRAGMENT

            new Sending_Data_To_Server().execute(First,Last,Phone,Mail,Pass);    

            Log.d("REGISTRATION CLASS","----ALL DATA READY AND CAPTURED");    
            startActivity(AllData);    
            break;

        case R.id.Uploader:
            pickImage();    
    }
}   

private void pickImage(){
     Intent intent=new Intent();
     Log.d("Registration Fragment","Calling PickImage");
     intent.setType("image/*");
     intent.setAction(Intent.ACTION_GET_CONTENT);
     Log.d("Registration Fragment","Calling PickImage 2");
     startActivityForResult(Intent.createChooser(intent,"Complete Action Using"),1);

 }

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode==1 && resultCode==getActivity().RESULT_OK){

        imageNameURL=data.getData();
        ImagePath=getPath(imageNameURL);
        Log.d("onActivityResult",ImagePath);

        bitmap= BitmapFactory.decodeFile(ImagePath);       

        PreviewImage.setImageBitmap(bitmap);   
    }   
}  

public String getPath(Uri uri){
    String[] projection={MediaStore.Images.Media.DATA};
    Cursor cursor=getActivity().getContentResolver().query(uri,projection,null,null,null);
    int Column_Index=cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    ImagePath=cursor.getString(Column_Index);
    cursor.close();
    //Bitmap bitmap= BitmapFactory.decodeFile(ImagePath);
    return ImagePath;    
}

public static String  Convert_To_Base64(Bitmap bmp){
    ByteArrayOutputStream baos=new ByteArrayOutputStream();
    bmp.compress(Bitmap.CompressFormat.JPEG,100,baos);
    byte[] imageBytes=baos.toByteArray();
    String encodedImage= Base64.encodeToString(imageBytes,Base64.DEFAULT);
    return encodedImage;
}

}

每当我在onActivityResult外部调用ImagePath将图像发送到服务器时，它总是返回NULL。当我试图在Activity上做同样的事情时，它会在onActivityResult之外显示图像的路径。请告诉我我在哪里做错了

Answer 1

首先制作

String ImagePath=null;

进入

String ImagePath;

然后从你那里点击从这个

获取imagePath的Bitmap

 if (ImagePath!=null){
 Log.d("ONCLICIK---------------",ImagePath);
 Bitmap bitmapFromPath= BitmapFactory.decodeFile(ImagePath);

 String baseImage=Convert_To_Base64(bitmapFromPath);
 new Sending_Data_To_Server().execute(First,Last,Phone,Mail,Pass,lattitude,longitude,accuracy,provider,baseImage);
                    startActivity(AllData);
                    getActivity().finish();

 }

然后在Sending_Data_To_Server（）AsyncTask中将其作为String处理，就像其他String

一样

String在Fragment中的onActivityResult之外返回Null

1 个答案: