Java 正在将Hashmap变量上载到Firebase数据库

我正在Hashmap中创建一个元素，该元素保存从手机存储器上传到Firebase存储器的照片路径。如果我上传了多张照片，我的Hashmap中应该有一个元素（图1、图2、图3……）根据上传的照片数量保存照片路径

每次我运行这个程序时，Hashmap的其他元素“Name，Email”都会被上传，但是照片路径（“image”+I）不会上传

我希望最终结果在数据库中如下所示：

我的工作中有什么缺陷吗？不管怎样，有什么办法可以让这一切顺利进行吗

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();
                    }
                });
            }
        }
    }
}

---

尝试使用最新版本的谷歌服务，如（项目级）：

并将现有代码替换为以下代码：

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'

public类MainActivity扩展了AppCompatActivity{
私人按钮mSelectimage；
私有存储器；参考存储器；
私有数据库参考数据库；
私有Uri图像；
专用光路；
最终静态int画廊_意向=2；
int i；
int j；
选择整数总和；
字符串push_id；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
mSelectimage=（按钮）findViewById（R.id.button2）；
mStorage=FirebaseStorage.getInstance（）.getReference（）；
mDatabase=FirebaseDatabase.getInstance（）.getReference（）；
push_id=mDatabase.child（“用户”）.push（）.getKey（）；
mSelectimage.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
意向意向=新意向（意向、行动和选择）；
intent.setType（“image/*”）；
intent.putExtra（intent.EXTRA_允许_倍数，true）；
startActivityForResult（意向、画廊意向）；
}
});
}
@凌驾
受保护的void onActivityResult（int请求代码、int结果代码、意图数据）{
super.onActivityResult（请求代码、结果代码、数据）；
final HashMap datamap=新HashMap（）；
if（requestCode==GALLERY\u INTENT&&resultCode==RESULT\u OK）{
if（data.getClipData（）！=null）{
totalItelmsSelected=data.getClipData（）.getItemCount（）；
对于（i=0；i

---

}

这里的问题是，当您将图像放入存储器时，此过程是异步进行的。所以，在将图像放入存储器并在hashmap中添加uri之前，将调用firebase数据库上的方法：

因此，您必须确保在firebase上调用方法之前已完成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();
                    }
                });
            }
        }
    }
}

@覆盖
受保护的void onActivityResult（int请求代码、int结果代码、意图数据）{
super.onActivityResult（请求代码、结果代码、数据）；
final HashMap datamap=新HashMap（）；
if（requestCode==GALLERY\u INTENT&&resultCode==RESULT\u OK）{
if（data.getClipData（）！=null）{
totalItelmsSelected=data.getClipData（）.getItemCount（）；
对于（i=0；iapply 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'

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();
                    }
                });
            }


        }
    }
}

@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();
                    }
                });
            }
        }
    }
}