每个人打招呼, 在我的项目中,我成功地将文件上传到了Firebase存储中,并将捕获的URL保存到了Firestore中,然后可以通过按一下旁边的按钮来单独下载每个文件。 现在我决定创建一个删除按钮,以在按下特定文件时将其删除,该如何实现? 删除按钮现在可以使用了,但是它删除了我必须在javascript中手动添加的文档名称并尝试使用它,我希望删除按钮可以删除文件,而该文件在同一视图中就像按钮下载一样。
//my adapater contain the codes of download and delete //
package com.example.boc;
import android.app.DownloadManager;
import android.content.Context;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.FirebaseFirestore;
import java.util.ArrayList;
import static android.os.Environment.DIRECTORY_DOWNLOADS;
public class MyPdfAdapter extends RecyclerView.Adapter<MyViewHolder> {
pdfDownloader pdfDownloader;
ArrayList<DownModel> downModels;
FirebaseFirestore db;
public MyPdfAdapter(pdfDownloader pdfDownloader , ArrayList<DownModel> downModels) {
this.pdfDownloader = pdfDownloader;
this.downModels = downModels;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
LayoutInflater layoutInflater = LayoutInflater.from(pdfDownloader.getBaseContext());
View view = layoutInflater.inflate(R.layout.elements, null, false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int i) {
myViewHolder.mName.setText(downModels.get(i).getName());
myViewHolder.mLink.setText(downModels.get(i).getLink());
myViewHolder.deletePdfBtn.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
deletepdf();
}
} );
myViewHolder.mDownload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
downloadFile(myViewHolder.mName.getContext(),downModels.get(i).getName(),".pdf",DIRECTORY_DOWNLOADS,downModels.get(i).getLink());
}
});
}
***//here is the delete operation //***
private void deletepdf() {
db.collection( "files" ).document().delete()
.addOnSuccessListener( new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
}
} );
}
public void downloadFile(Context context, String fileName, String fileExtension, String destinationDirectory, String url) {
DownloadManager downloadmanager = (DownloadManager) context.
getSystemService(Context.DOWNLOAD_SERVICE);
Uri uri = Uri.parse(url);
DownloadManager.Request request = new DownloadManager.Request(uri);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalFilesDir(context, destinationDirectory, fileName + fileExtension);
downloadmanager.enqueue(request);
}
@Override
public int getItemCount() {
return downModels.size();
}
}