java - Ui 击中 Firebase Firestore 删除数据？

Question

我正在使用 Firebase Firestore 我想从数据库中删除数据..删除数据工作正常，但我的进度对话框卡住了。我想我必须使用工作线程，但我不知道如何使用。

 db = FirebaseFirestore.getInstance();
            db.collection("expenses").document(ids)
                    .delete()
                    .addOnSuccessListener(new OnSuccessListener<Void>() {
                        @Override
                        public void onSuccess(Void aVoid) {

                             Toast.makeText(Expense_Summary.this, "successfully deleted file", Toast.LENGTH_SHORT).show();
                            result = "deleted";
                            hideProgressDialog();
                            finish();

                        }
                    })
                    .addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            Log.w("deleting f", "Error deleting document", e);
                            hideProgressDialog();
                            Toast.makeText(Expense_Summary.this, "Error deleting file", Toast.LENGTH_SHORT).show();
                        }
                    });

I Refered doc : https://firebase.google.com/docs/firestore/manage-data/delete-data

Answer 1

试试这个:

 final ProgressDialog progressDialog = ProgressDialog.show(Activity_name_here.this,"Please wait","Processing",true);
                            Runnable runnable=new Runnable() {
                                @Override
                                public void run() {
                                    progressDialog.cancel();
                                }
                            };
                            Handler pdCanceller = new Handler();
                            pdCanceller.postDelayed(runnable, 3000);
 db = FirebaseFirestore.getInstance();
        db.collection("expenses").document(ids)
                .delete()
                .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void aVoid) {

                         Toast.makeText(Expense_Summary.this, "successfully deleted file", Toast.LENGTH_SHORT).show();
                        result = "deleted";
                       progressDialog.dismiss();
                        finish();

                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Log.w("deleting f", "Error deleting document", e);
                        progressDialog.dismiss();
                        Toast.makeText(Expense_Summary.this, "Error deleting file", Toast.LENGTH_SHORT).show();
                    }
                });

使用上面的代码，将显示一个进度对话框，其中包含文本“请稍候”，并且旁边写着一个小圆圈正在处理。

This: pdCanceller.postDelayed(runnable, 3000); 指定此处的时间示例，我使用 3000 毫秒。然后，如果成功，进度对话框将被关闭。或者，如果失败，进度对话框也将被关闭。