我正在嘗試從 Firebase 數(shù)據(jù)庫中檢索 9 個(gè)布爾變量和一個(gè) int 變量，但是每次我運(yùn)行我的應(yīng)用程序時(shí)，它都會(huì)給我一個(gè)空指針異常它來自一個(gè) Android 應(yīng)用程序，我設(shè)置了一個(gè)模型頁面，我設(shè)置了 getter 和 setter 方法，但它一直在檢索空指針 exeption 這是模型public class ButtonInformation { private boolean Button1=false; private boolean Button2=false; private boolean Button3=false; private boolean Button4=false; private boolean Button5=false; private boolean Button6=false; private boolean Button7=false; private boolean Button8=false; private boolean Button9=false; private int ApeOmaggio=0; public ButtonInformation(){ } public ButtonInformation(boolean button1, boolean button2, boolean button3, boolean button4, boolean button5, boolean button6, boolean button7, boolean button8, boolean button9, int apeOmaggio) { Button1 = button1; Button2 = button2; Button3 = button3; Button4 = button4; Button5 = button5; Button6 = button6; Button7 = button7; Button8 = button8; Button9 = button9; ApeOmaggio = apeOmaggio; } public boolean getButton1(){ return Button1; } public void setButton1(boolean Button1){ this.Button1 = Button1; } public boolean getButton2(){ return Button2; } public void setButton2(boolean Button2){ this.Button2 = Button2; } public boolean getButton3(){ return Button3; } public void setButton3(boolean Button3){ this.Button3 = Button3; } public boolean getButton4(){ return Button4; } public void setButton4(boolean Button4){ this.Button4 = Button4; } public boolean getButton5(){ return Button5; } public void setButton5(boolean Button5){ this.Button5 = Button5; } public boolean getButton6(){ return Button6; } public void setButton6(boolean Button6){ this.Button6 = Button6; } public boolean getButton7(){ return Button7; }
2 回答
慕姐4208626
TA貢獻(xiàn)1852條經(jīng)驗(yàn) 獲得超7個(gè)贊
您可以直接將您的模型類與 Firebase 響應(yīng)數(shù)據(jù)進(jìn)行映射。您不必手動(dòng)設(shè)置模型類中的每個(gè)數(shù)據(jù)。
如果您的數(shù)據(jù)將從 Firebase 中成功檢索，則此代碼將起作用，請嘗試以下代碼。
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_clienti);
Utente=findViewById(R.id.tvUtente);
ApeOmaggio = findViewById(R.id.tvOmaggio);
bInfo= new ButtonInformation();
img1=findViewById(R.id.img1);
img2=findViewById(R.id.img2);
img3=findViewById(R.id.img3);
img4=findViewById(R.id.img4);
img5=findViewById(R.id.img5);
img6=findViewById(R.id.img6);
img7=findViewById(R.id.img7);
img8=findViewById(R.id.img8);
img9=findViewById(R.id.img9);
mAuth=FirebaseAuth.getInstance();
mFirebaseDatabase = FirebaseDatabase.getInstance();
user = mAuth.getCurrentUser();
utenteLog = user.getDisplayName();
mail = user.getEmail();
mailNoSpace=mail.replaceAll("\\.","");
Utente.setText(utenteLog);
myRef=mFirebaseDatabase.getReference(mailNoSpace);
myRef.addValueEventListener(new ValueEventListener()
{
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
ButtonInformation buttonInformation = dataSnapshot.getValue(ButtonInformation.class);
showData(buttonInformation);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void showData(ButtonInformation buttonInformation) {
if (buttonInformation.getButton1()==true){
img1.setImageResource(R.drawable.berry_icon);
}else{
img1.setImageResource(R.drawable.radio_button);
}
if (buttonInformation.getButton2()==true){
img2.setImageResource(R.drawable.berry_icon);
}else{
img2.setImageResource(R.drawable.radio_button);
}
if (buttonInformation.getButton3()==true){
img3.setImageResource(R.drawable.berry_icon);
}else{
img3.setImageResource(R.drawable.radio_button);
}
if (buttonInformation.getButton4()==true){
img4.setImageResource(R.drawable.berry_icon);
}else{
img4.setImageResource(R.drawable.radio_button);
}
if (buttonInformation.getButton5()==true){
img5.setImageResource(R.drawable.berry_icon);
}else{
img5.setImageResource(R.drawable.radio_button);
}
if (buttonInformation.getButton6()==true){
img6.setImageResource(R.drawable.berry_icon);
}else{
img6.setImageResource(R.drawable.radio_button);
}
if (buttonInformation.getButton7()==true){
img7.setImageResource(R.drawable.berry_icon);
}else{
img7.setImageResource(R.drawable.radio_button);
}
if (buttonInformation.getButton8()==true){
img8.setImageResource(R.drawable.berry_icon);
}else{
img8.setImageResource(R.drawable.radio_button);
}
if (buttonInformation.getButton9()==true){
img9.setImageResource(R.drawable.berry_icon);
}else{
img9.setImageResource(R.drawable.radio_button);
}
ApeOmaggio.setText(Integer.toString(bInfo.getApeOmaggio()));
}
牛魔王的故事
TA貢獻(xiàn)1830條經(jīng)驗(yàn) 獲得超3個(gè)贊
在訪問 firebase 之前使用 if not null 條件?；蛘?，如果您已將子屬性更改為您的 firebase 項(xiàng)目，請檢查樹。
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