java Firebase数据库。getInstance()崩溃应用程序
我正在尝试使用谷歌地图API和Firebase构建一个跟踪器应用程序。 我试图使用onStart()中的getValue()方法从Firebase中获取值,并将它们用作纬度和经度来显示位置。我的代码:
MapsActivity。java
private FirebaseDatabase firebaseDatabase=FirebaseDatabase.getInstance();
private DatabaseReference mRootReference =firebaseDatabase.getReference();
private DatabaseReference mChildReference=mRootReference.child("Raunak Trikha");
private DatabaseReference mChildReference1=mChildReference.child("id");
private DatabaseReference mChildReference2=mChildReference1.child("lat");
private DatabaseReference mChildReference3=mChildReference1.child("long");
@Override
protected void onStart(){
super.onStart();
mChildReference2.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
rlat=dataSnapshot.getValue(double.class);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}`
每当我尝试在AVD中运行此应用时,它就会崩溃
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