當(dāng)我在 MainActivity 中時(shí)，當(dāng)使用 model_user 從 firebase 設(shè)置用戶名時(shí)，我得到 null，這是我使用的代碼//MainActivity.xml<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"tools:context=".MainActivity"><com.google.android.material.appbar.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <androidx.appcompat.widget.Toolbar android:id="@+id/Toolbar_Main" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/colorPrimaryDark" android:theme="@style/Base.ThemeOverlay.AppCompat.Dark.ActionBar"> <de.hdodenhof.circleimageview.CircleImageView android:layout_width="30dp" android:layout_height="30dp" android:id="@+id/profile_image" android:src="@drawable/profile_blank"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/username" android:textSize="18sp" android:layout_marginLeft="25dp" android:textColor="#fff" android:textStyle="bold" android:layout_marginStart="25dp" /> </androidx.appcompat.widget.Toolbar> <com.google.android.material.tabs.TabLayout android:id="@+id/tab_layout" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/colorPrimaryDark" app:tabSelectedTextColor="#fff" app:tabIndicatorColor="#fff" app:tabTextColor="#fff"/></com.google.android.material.appbar.AppBarLayout><androidx.viewpager.widget.ViewPager android:id="@+id/view_pager" android:layout_width="match_parent" android:layout_height="match_parent"</LinearLayout>
2 回答
慕工程0101907
TA貢獻(xiàn)1887條經(jīng)驗(yàn) 獲得超5個(gè)贊
刪除 getter-setter 并添加空構(gòu)造函數(shù)
ModelUser.java
public class ModelUser {
public String id;
public String username;
public String imageURL;
public ModelUser(String id, String username, String imageURL) {
this.id = id;
this.username = username;
this.imageURL = imageURL;
}
public ModelUser() {
}
}
嘗試這個(gè)
慕運(yùn)維8079593
TA貢獻(xiàn)1876條經(jīng)驗(yàn) 獲得超5個(gè)贊
它不需要?jiǎng)h除 setter getter，
那么從此
public class ModelUser {
private String id;
private String username;
private String imageURL;
public ModelUser(String id, String username, String imageURL) {
this.id = id;
this.username = username;
this.imageURL = imageURL;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getImageURL() {
return imageURL;
}
public void setImageURL(String imageURL) {
this.imageURL = imageURL;
}
}
只需添加一個(gè)空的構(gòu)造函數(shù)即可正常工作:)
public class ModelUser {
public String id;
public String username;
public String imageURL;
public ModelUser(String id, String username, String imageURL) {
this.id = id;
this.username = username;
this.imageURL = imageURL;
}
//Add this
public ModelUser() {
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getImageURL() {
return imageURL;
}
public void setImageURL(String imageURL) {
this.imageURL = imageURL;
}
}
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