将字符串值从一种方法发送到另一种方法

Question

我的第一个方法deviceList可以成功工作，并且我可以在变量String.id中存储一个值。然后，我尝试在第二个方法addReview1中使用该字符串以在数据库搜索中实现该字符串。但是，方法addReview1是通过按钮onclick请求的。我尝试将第二种方法设置为addRview1 (String id)，但是按钮onclick无效，应用程序将崩溃。因此，在将字符串ID从deviceList发送到addReview1时，我需要帮助。

方法deviceList

public void deviceList (View V){

    db.collection("devices")
            .whereEqualTo("name", value)
            .get()
            .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                @Override
                public void onComplete(@NonNull Task<QuerySnapshot> task) {
                    if(task.isSuccessful()){
                        for (final QueryDocumentSnapshot document : task.getResult()){
                            Log.i("DeviceId", document.getId());
                            String id = document.getId();


                        }
                    }
                    else
                    {
                        Log.i("Devices","Error" + task.getException());
                        Toast.makeText(getBaseContext(),"Error retrieving getting device names",Toast.LENGTH_LONG).show();
                    }
                }
            });

};

方法addReview1

public void addReview1 (View V){

    Name = (EditText) findViewById(R.id.Name);
    Content = (EditText) findViewById(R.id.Content);
    Rating = (EditText) findViewById(R.id.Rating);
    button4 = (Button) findViewById(R.id.button4);

    Map<String, Object> review = new HashMap<>();

    review.put("date", new Date());
    review.put("name", Name.getText().toString());
    review.put("content", Content.getText().toString());
    review.put("rating", Integer.parseInt(Rating.getText().toString()));

    db.collection("devices").document("1").collection("reviews").add(review)
            .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                @Override
                public void onSuccess(DocumentReference documentReference) {
                    Toast.makeText(getApplicationContext(), "Comment added", Toast.LENGTH_LONG).show();
                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
                }
            });
    };

Answer 1

我设法解决了一个简单的问题。

像这样在onCreate上面声明字符串

String NewId;

在deviceList方法中

public void deviceList (View V){

    db.collection("devices")
            .whereEqualTo("name", value)
            .get()
            .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                @Override
                public void onComplete(@NonNull Task<QuerySnapshot> task) {
                    if(task.isSuccessful()){
                        for (final QueryDocumentSnapshot document : task.getResult()){
                            Log.i("DeviceId", document.getId());
                            NewId = document.getId();


                        }
                    }
                    else
                    {
                        Log.i("Devices","Error" + task.getException());
                        Toast.makeText(getBaseContext(),"Error retrieving getting device names",Toast.LENGTH_LONG).show();
                    }
                }
            });

};

在方法addReview1

中

public void addReview1 (View V){

    Name = (EditText) findViewById(R.id.Name);
    Content = (EditText) findViewById(R.id.Content);
    Rating = (EditText) findViewById(R.id.Rating);
    button4 = (Button) findViewById(R.id.button4);

    Map<String, Object> review = new HashMap<>();

    review.put("date", new Date());
    review.put("name", Name.getText().toString());
    review.put("content", Content.getText().toString());
    review.put("rating", Integer.parseInt(Rating.getText().toString()));

    db.collection("devices").document(NewId).collection("reviews").add(review)
            .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                @Override
                public void onSuccess(DocumentReference documentReference) {
                    Toast.makeText(getApplicationContext(), "Comment added", Toast.LENGTH_LONG).show();
                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
                }
            });
    };