Question

我想将图片上传到我的数据库并订购。我的上传代码如下所示 -

package com.example.cagri.cafeorderapp;

import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;

import java.io.IOException; 

public class AddFood extends AppCompatActivity {

private int PICK_IMAGE_REQUEST = 1;
private ImageButton foodImage;
private static final int GELLERQ=1;
private EditText name, desc, price;
private Uri uri=null;
private StorageReference storageReference = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_food);

    name=(EditText)findViewById(R.id.itemName);
    desc=(EditText)findViewById(R.id.itemDesc);
    price=(EditText)findViewById(R.id.itemPrice);
    storageReference= FirebaseStorage.getInstance().getReference("Item");
}

public void imageButtonClicked(View view)
{
    Intent intent = new Intent();
// Show only images, no videos or anything else
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
// Always show the chooser (if there are multiple options available)
     startActivityForResult(Intent.createChooser(intent, "Select Picture"), 
  PICK_IMAGE_REQUEST);
}

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

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {

        Uri uri = data.getData();

        try {
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
            // Log.d(TAG, String.valueOf(bitmap));

            ImageView imageView = (ImageView) findViewById(R.id.foodImageButton);
            imageView.setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public void addItemButtonClicked(View view)
{
    String name_text=name.getText().toString().trim();
    String desc_text=desc.getText().toString().trim();
    String price_text=price.getText().toString().trim();

    if(!TextUtils.isEmpty(name_text) && !TextUtils.isEmpty(desc_text) && !TextUtils.isEmpty(price_text))
    {
        StorageReference filepath=storageReference.child(uri.getLastPathSegment());
        filepath.putFile(uri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                final Uri downloadurl = taskSnapshot.getDownloadUrl();
                Toast.makeText(AddFood.this,"Image uploaded",Toast.LENGTH_LONG).show();
            }
        });
    }
 }

但我得到的错误是

尝试调用虚方法'java.lang.String 关于空对象引用的android.net.Uri.getLastPathSegment（）'

一切都很好，我可以将项目图像放在imagebutton中，但是当我点击添加项目时，该过程就会停止。

Answer 1

Uri uri = data.getData();

（和其他东西）不幸的是，选择图片不是一个好方法

您需要使用带有文件选择的光标＆＃34;传统方式＆＃34; 获取真实路径

查看我的例子

此文件包含调用cursorloader

的示例

ActivityMainPopups.java

此文件包含所需的util方法

CursorPicker.java

或

如果您处理rxjava，我会建议使用此库https://github.com/MLSDev/RxImagePicker

它会给你一个正确的uri

我无法在Android Firebase上传图片

1 个答案: