我想在 MVC 中編寫(xiě)我的應(yīng)用程序。問(wèn)題是我是 Android 新手，如果函數(shù)不在主類(lèi)中，我不知道如何使用listener/ callback。public void addNewUser(String firstname, String lastname, String email, Integer gender, String uid, String profileImageUrl){ Map<String, Object> data = new HashMap<>(); data.put("firstname", firstname); data.put("lastname", lastname); data.put("email", email); data.put("gender", gender); data.put("boxId", "independent"); data.put("notificationsEnabled", true); data.put("profileImageUrl", profileImageUrl); mFirebaseFirestore.collection("usersP").add(data) .addOnSuccessListener(new OnSuccessListener<DocumentReference>() { @Override public void onSuccess(DocumentReference documentReference) { mProgressBar.setVisibility(View.GONE); mIRegisterActivity.inflateFragment("Register Box", mHashMap); Log.d(TAG, "DocumentSnapshot written with ID: " + documentReference.getId()); } }) .addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { Log.d(TAG, "Error adding document", e); } }); }我想在不同的 Java 類(lèi)中使用這個(gè)函數(shù)。但是，如果我這樣做，我不知道如何僅在函數(shù)完成執(zhí)行時(shí)才能啟動(dòng)操作 -> 換句話說(shuō)，當(dāng)它是addOnSuccessListener.你知道我怎么做嗎？我習(xí)慣于快速編碼，它會(huì)是這樣的：func addUser(id: String, completion: @escaping (User) -> Void) { // Code and then completion(user) }
3 回答
海綿寶寶撒
TA貢獻(xiàn)1809條經(jīng)驗(yàn) 獲得超8個(gè)贊
您應(yīng)該為此創(chuàng)建自己的自定義偵聽(tīng)器，MyFirebaseListener并通過(guò)實(shí)現(xiàn)此接口來(lái)更新您的活動(dòng)內(nèi)容
public interface MyFirebaseListener {
void onSuccess(DocumentReference documentReference)
void onFailure(Exception e)
}
現(xiàn)在將Activity 作為參數(shù)傳遞給MyFirebaseListenertoaddNewUser()方法，如下所示
public class UserApi{
public void addNewUser(String firstname,
String lastname,
String email,
Integer gender,
String uid,
String profileImageUrl,
MyFirebaseListener myFirebaseListener){
Map<String, Object> data = new HashMap<>();
data.put("firstname", firstname);
data.put("lastname", lastname);
data.put("email", email);
data.put("gender", gender);
data.put("boxId", "independent");
data.put("notificationsEnabled", true);
data.put("profileImageUrl", profileImageUrl);
mFirebaseFirestore.collection("usersP").add(data)
.addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
@Override
public void onSuccess(DocumentReference documentReference) {
myFirebaseListener.onSuccess(documentReference)
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
myFirebaseListener.onFailure(e)
}
});
}
}
MyFirebaseListener在您的 Activity 中實(shí)現(xiàn)接口，因此您需要覆蓋以下方法并在這些實(shí)現(xiàn)的方法中執(zhí)行UI 修改，如下所示
public class MyActivity extends AppCompatActivity implements MyFirebaseListener {
void someMethod(){
addNewUser(firstname,
lastname,
email,
gender,
uid,
profileImageUrl,
this) // <- This will be reference to Activity with Type of MyFirebaseListener
}
void onSuccess(DocumentReference documentReference){
mProgressBar.setVisibility(View.GONE);
mIRegisterActivity.inflateFragment("Register Box", mHashMap);
Log.d(TAG, "DocumentSnapshot written with ID: " + documentReference.getId());
}
void onFailure(Exception e){
Log.d(TAG, "Error adding document", e);
}
}
這就是使用自定義接口分離 UI 邏輯和服務(wù)邏輯的方法
慕無(wú)忌1623718
TA貢獻(xiàn)1744條經(jīng)驗(yàn) 獲得超4個(gè)贊
您可以使用兩種不同的方法......第一：你可以制作一個(gè)回調(diào)接口，就像我們?cè)?RecyclerView 點(diǎn)擊回調(diào)的情況下所做的一樣......
第二：如果你必須對(duì) rxJava2、arch life 或 Agera 有一點(diǎn)了解，你可以使用 livedata 觀察者......
所以讓我們考慮第一個(gè)方法
考慮你的班級(jí)是
class otherClass{
callbackInterface mCallBackInterface;
public(callbackInterface mCallBackInterface){
this.mCallBackInterface=mCallBackInterface;
}
interface callbackInterface{
void onSucuss(DocumentReference documentReference);
}
public void addNewUser(String firstname, String lastname, String email, Integer gender, String uid, String profileImageUrl){
Map<String, Object> data = new HashMap<>();
data.put("firstname", firstname);
data.put("lastname", lastname);
data.put("email", email);
data.put("gender", gender);
data.put("boxId", "independent");
data.put("notificationsEnabled", true);
data.put("profileImageUrl", profileImageUrl);
mFirebaseFirestore.collection("usersP").add(data)
.addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
@Override
public void onSuccess(DocumentReference documentReference) {
mCallBackInterface.onSucuss(decumentReference);
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.d(TAG, "Error adding document", e);
}
});
}
}
///The Class which will be calling it will be something like this
class CallingClass implements CallBackInterface{
@Override
void CallBackINterface(DocumentReference documentReference){
//Your code goes here
}
}
這將完成工作廣播接收器也可以使用，但上述解決方案最適合初學(xué)者......
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