如何在Android的Firebase存储中上传PDF文件？

Firebase是一个移动和Web应用程序开发平台。它提供Web应用程序或移动应用程序可能需要的服务。 Firebase为Firebase应用程序提供安全的文件上传和下载。本文介绍了如何构建能够从手机中选择pdf并将该pdf上载到Firebase Storage的Android应用程序。

分步实施

步骤1：创建一个新项目

要在Android Studio中创建新项目，请参阅如何在Android Studio中创建/启动新项目。请注意，选择Java作为编程语言。并将Firebase添加到您的项目中，或者可以参考将Firebase添加到Android App中。

步骤2：在build.gradle(模块：应用程序)文件中添加依赖项

导航到Gradle脚本> build.gradle(模块：应用程序)，然后在“依赖项”部分添加以下依赖项。

implementation ‘com.google.firebase:firebase-storage:16.0.4’

implementation fileTree(dir: ‘libs’, include: [‘*.jar’])

添加此依赖项后，同步您的项目，现在我们将继续执行它。

步骤3：使用activity_main.xml文件

导航到应用程序> res>布局> activity_main.xml，然后将以下代码添加到该文件中。以下是activity_main.xml文件的代码。

步骤4：使用MainActivity。 Java文件

转到MainActivity。 Java文件并参考以下代码。下面是MainActivity的代码。 Java文件。在代码内部添加了注释，以更详细地了解代码。

Java

import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
  
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
  
import com.google.android.gms.tasks.Continuation;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
  
public class MainActivity extends AppCompatActivity {
  
    ImageView upload;
    Uri imageuri = null;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        upload = findViewById(R.id.uploadpdf);
  
        // After Clicking on this we will be
        // redirected to choose pdf
        upload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent galleryIntent = new Intent();
                galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
  
                // We will be redirected to choose pdf
                galleryIntent.setType("application/pdf");
                startActivityForResult(galleryIntent, 1);
            }
        });
    }
  
    ProgressDialog dialog;
  
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
              
            // Here we are initialising the progress dialog box
            dialog = new ProgressDialog(this);
            dialog.setMessage("Uploading");
  
            // this will show message uploading
            // while pdf is uploading
            dialog.show();
            imageuri = data.getData();
            final String timestamp = "" + System.currentTimeMillis();
            StorageReference storageReference = FirebaseStorage.getInstance().getReference();
            final String messagePushID = timestamp;
            Toast.makeText(MainActivity.this, imageuri.toString(), Toast.LENGTH_SHORT).show();
  
            // Here we are uploading the pdf in firebase storage with the name of current time
            final StorageReference filepath = storageReference.child(messagePushID + "." + "pdf");
            Toast.makeText(MainActivity.this, filepath.getName(), Toast.LENGTH_SHORT).show();
            filepath.putFile(imageuri).continueWithTask(new Continuation() {
                        @Override
                        public Object then(@NonNull Task task) throws Exception {
                            if (!task.isSuccessful()) {
                                throw task.getException();
                            }
                            return filepath.getDownloadUrl();
                        }
                    }).addOnCompleteListener(new OnCompleteListener() {
                @Override
                public void onComplete(@NonNull Task task) {
                    if (task.isSuccessful()) {
                        // After uploading is done it progress
                        // dialog box will be dismissed
                        dialog.dismiss();
                        Uri uri = task.getResult();
                        String myurl;
                        myurl = uri.toString();
                        Toast.makeText(MainActivity.this, "Uploaded Successfully", Toast.LENGTH_SHORT).show();
                    } else {
                        dialog.dismiss();
                        Toast.makeText(MainActivity.this, "UploadedFailed", Toast.LENGTH_SHORT).show();
                    }
                }
            });
        }
    }
}

输出：

Firebase存储：

Github链接。

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