将 Hashmap 变量上传到 Firebase 数据库答案

【问题标题】：Uploading Hashmap Variable to Firebase Database将 Hashmap 变量上传到 Firebase 数据库
【发布时间】：2018-11-08 23:45:05
【问题描述】：

我正在我的 Hashmap 中创建一个元素，其中包含从手机存储上传到 Firebase 存储的照片的照片路径。如果我上传了多张照片，我的 Hashmap 中应该有一个元素（图像 1、图像 2、图像 3……），它根据上传的照片数量保存照片路径。

每次我运行程序时，Hashmap“姓名，电子邮件”的其他元素都会被上传，但照片路径（“图像”+i）不会上传。

我希望最终结果在数据库中如下所示： the end result in Firebase Database

我的工作有什么错误吗？有什么方法可以使这项工作吗？

这是我的代码：

import android.content.Intent;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;

import java.util.ArrayList;
import java.util.HashMap;

public class MainActivity extends AppCompatActivity {
    private Button mSelectimage;
    private StorageReference mStorage;
    private DatabaseReference mDatabase;
    private Uri image;
    private String photoPath;
    final static int GALLERY_INTENT = 2;
    int i;
    int j;
    int totalItelmsSelected;

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

        mSelectimage = (Button) findViewById(R.id.button2);
        mStorage = FirebaseStorage.getInstance().getReference();
        mDatabase = FirebaseDatabase.getInstance().getReference();

        mSelectimage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setType("image/*");
                intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
                startActivityForResult(intent, GALLERY_INTENT);
            }
        });

    }

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

        final HashMap <Object,Object> datamap = new HashMap<Object, Object>();

        if(requestCode == GALLERY_INTENT && resultCode == RESULT_OK){

            if(data.getClipData() != null){

                totalItelmsSelected = data.getClipData().getItemCount();

                for(i=0; i < totalItelmsSelected; i++){

                    image = data.getClipData().getItemAt(i).getUri();
                    final StorageReference filepath = mStorage.child("photos").child(image.getLastPathSegment()+".jpg");
                    filepath.putFile(image).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                        @Override
                        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                            photoPath = filepath.getPath();
                            datamap.put("image "+i , photoPath);
                            Toast.makeText(MainActivity.this, i+" Photos has been uploaded.", Toast.LENGTH_SHORT).show();

                        }
                    }).addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            Toast.makeText(MainActivity.this, "Problem in Uploading "+i+" Photos.", Toast.LENGTH_SHORT).show();
                        }
                    });
                }

                datamap.put("Name", "Kamil");
                datamap.put("Email", "Kamil@gmail.com");

               mDatabase.child("users").push().setValue(datamap).addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void aVoid) {
                        Toast.makeText(MainActivity.this, "Uploading to the database is done", Toast.LENGTH_SHORT).show();
                    }
                }).addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(MainActivity.this, "Problem in registuring the information", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }
    }
}

这是我的 gradle 代码：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.mohammed.storemultipleimages"
        minSdkVersion 26
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.google.firebase:firebase-database:11.8.0'
    implementation 'com.google.firebase:firebase-storage:11.8.0'
    implementation 'com.google.firebase:firebase-auth:11.8.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

apply plugin: 'com.google.gms.google-services'

【问题讨论】：

请给我们grandle文件，可能是firebase版本的问题
尝试 .push().updateChildren(datamap) 而不是 setValue()
@ParaskevasNtsounos 完成
@KamilAhmed 试试我的答案并告诉我它是否有效
@JinsonPaul 同样的问题，当我上传 2 张照片时，它只需要一张照片的路径。它没有放置 2 条路径。

标签： java android firebase firebase-realtime-database firebase-storage

【解决方案1】：

尝试使用最新版本的谷歌服务，例如（项目级别）：

classpath 'com.google.gms:google-services:4.0.1'

并用以下代码替换您现有的代码：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.mohammed.storemultipleimages"
        minSdkVersion 26
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.google.firebase:firebase-database:16.0.1'
    implementation 'com.google.firebase:firebase-storage:16.0.1'
    implementation 'com.google.firebase:firebase-auth:16.0.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

apply plugin: 'com.google.gms.google-services'

【讨论】：

【解决方案2】：

这里的问题是，当您将图像放入存储中时，此过程是异步发生的。因此，在将图像存储并在 hashmap 中添加 uri 之前，将调用 firebase 数据库上的方法：

所以你必须确保在调用firebase上的方法之前你已经完成了hashmap过程：

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

    final HashMap <Object,Object> datamap = new HashMap<Object, Object>();

    if(requestCode == GALLERY_INTENT && resultCode == RESULT_OK){

        if(data.getClipData() != null){

            totalItelmsSelected = data.getClipData().getItemCount();

            for(i=0; i < totalItelmsSelected; i++){

                image = data.getClipData().getItemAt(i).getUri();
                final StorageReference filepath = mStorage.child("photos").child(image.getLastPathSegment()+".jpg");
                filepath.putFile(image).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                        photoPath = filepath.getPath();
                        datamap.put("image "+i , photoPath);
                        datamap.put("Name", "Kamil");
                        datamap.put("Email", "Kamil@gmail.com");

                      mDatabase.child("users").push().setValue(datamap).addOnSuccessListener(new OnSuccessListener<Void>() {
                           @Override
                           public void onSuccess(Void aVoid) {
                               Toast.makeText(MainActivity.this, "Uploading to the database is done", Toast.LENGTH_SHORT).show();
                           }
                       }).addOnFailureListener(new OnFailureListener() {
                           @Override
                           public void onFailure(@NonNull Exception e) {
                               Toast.makeText(MainActivity.this, "Problem in registuring the information", Toast.LENGTH_SHORT).show();
                           }
                       });
                        Toast.makeText(MainActivity.this, i+" Photos has been uploaded.", Toast.LENGTH_SHORT).show();

                    }
                }).addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(MainActivity.this, "Problem in Uploading "+i+" Photos.", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }
    }
}

【讨论】：

如果我在循环内或循环外完成 Hashmap 会有所不同吗？在将其上传到 Firebase 数据库之前，我应该将所有元素一个接一个地添加到 Hashmap 吗？我不能随机添加数据到Hashmap然后一起上传吗？
你没有明白我的意思。我的意思是在运行datamap.put("image "+i , photoPath) 之前，您的应用程序正在运行datamap.put("Name", "Kamil")、datamap.put("Email", "Kamil@gmail.com") 和`mDatabase.child("users")........`。因此，在您调用 firebase 数据库后，您的照片路径将被放入 hashmap 中。掌握一下java异步，你就会明白了。

【解决方案3】：

public class MainActivity extends AppCompatActivity {
private Button mSelectimage;
private StorageReference mStorage;
private DatabaseReference mDatabase;
private Uri image;
private String photoPath;
final static int GALLERY_INTENT = 2;
int i;
int j;
int totalItelmsSelected;
String push_id;

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

    mSelectimage = (Button) findViewById(R.id.button2);
    mStorage = FirebaseStorage.getInstance().getReference();
    mDatabase = FirebaseDatabase.getInstance().getReference();

    push_id = mDatabase.child("users").push().getKey();

    mSelectimage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
            startActivityForResult(intent, GALLERY_INTENT);
        }
    });

}

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

    final HashMap <Object,Object> datamap = new HashMap<Object, Object>();

    if(requestCode == GALLERY_INTENT && resultCode == RESULT_OK){

        if(data.getClipData() != null){

            totalItelmsSelected = data.getClipData().getItemCount();

            for(i=0; i < totalItelmsSelected; i++){

                image = data.getClipData().getItemAt(i).getUri();
                final StorageReference filepath = mStorage.child("photos").child(image.getLastPathSegment()+".jpg");
                filepath.putFile(image).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                    @Override
                    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                        photoPath = filepath.getPath();
                        datamap.put("image "+i , photoPath);
                        Toast.makeText(MainActivity.this, i+" Photos has been uploaded.", Toast.LENGTH_SHORT).show();
                        datamap.put("Name", "Kamil");
                        datamap.put("Email", "Kamil@gmail.com");

                        mDatabase.child("users").child(push_id).setValue(datamap).addOnSuccessListener(new OnSuccessListener<Void>() {
                        @Override
                        public void onSuccess(Void aVoid) {
                        Toast.makeText(MainActivity.this, "Uploading to the database is done", Toast.LENGTH_SHORT).show();
                        }
                        }).addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                          Toast.makeText(MainActivity.this, "Problem in registuring the information", Toast.LENGTH_SHORT).show();
                        }
                        });

                    }
                }).addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(MainActivity.this, "Problem in Uploading "+i+" Photos.", Toast.LENGTH_SHORT).show();
                    }
                });
            }


        }
    }
}

}

【讨论】：