我的活动中有两种方法。我试图在我的视图中显示这两种方法的结果。我被困在这里。我很感激你的帮助。
我试图在onCreate方法中调用它们，但我得到一个空屏幕：
这是我的代码：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
Firebase.setAndroidContext(this);
if (FirebaseAuth.getInstance().getCurrentUser() == null) {
startActivity(new Intent(MainActivity.this, Login.class));
} else {
if (FirebaseAuth.getInstance().getCurrentUser() != null) {
String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
}
}
firebaseAuth = FirebaseAuth.getInstance();
textView = (TextView) findViewById(R.id.textView);
textView2 = (TextView) findViewById(R.id.textView2);
textView4 = (TextView) findViewById(R.id.textView4);
textView5 = (TextView) findViewById(R.id.textView5);
textView3 = (TextView) findViewById(R.id.textView3);
loss = (FloatingActionButton) findViewById(R.id.loss);
profit = (FloatingActionButton) findViewById(R.id.profit);
statement = (FloatingActionButton) findViewById(R.id.statement);
salereport = (FloatingActionButton) findViewById(R.id.salereport);
sale = (FloatingActionButton) findViewById(R.id.sale);
exp = (FloatingActionButton) findViewById(R.id.exp);
total = (FloatingActionButton) findViewById(R.id.total);
loss.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, Katakastatement.class));
}
});
profit.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
firebaseAuth.signOut();
//closing activity
finish();
startActivity(new Intent(MainActivity.this, Login.class));
}
});
statement.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, KavisuniTotal.class));
}
});
sale.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, KatakaSales.class));
}
});
exp.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, Katakaexp.class));
}
});
salereport.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, kavisunistatement.class));
}
});
total.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, LukenyaSales.class));
}
});
}
private boolean Expenditu() {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
DatabaseReference dref = FirebaseDatabase.getInstance().getReference();
String loc = user.getUid();
dref = dref.child(loc + "Expenditure");
dref.addValueEventListener(new com.google.firebase.database.ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
String Name;
String Locatio;
int totalAmount = 0;
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
DogExpenditure dogExpenditure = postSnapshot.getValue(DogExpenditure.class);
totalAmount += dogExpenditure.getAmount();
textView4.setText(Integer.toString(totalAmount));
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
}
Expenditu();
return Expenditu();
}
private boolean sale() {
FirebaseUser user = firebaseAuth.getCurrentUser();
DatabaseReference dref = FirebaseDatabase.getInstance().getReference();
String loc = user.getUid();
dref = dref.child(loc + "Sales");
dref.addValueEventListener(new com.google.firebase.database.ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
String Name;
String Locatio;
int totalAmounte = 0;
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
DogExpenditure dogExpenditure = postSnapshot.getValue(DogExpenditure.class);
totalAmounte += dogExpenditure.getAmount();
textView5.setText(Integer.toString(totalAmounte));
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
sale();
return sale();
}
public void Names() {
DatabaseReference dreff = FirebaseDatabase.getInstance().getReference();
FirebaseUser user = firebaseAuth.getCurrentUser();
String loc = user.getUid();
dreff = dreff.child(loc);
dreff.addValueEventListener(new com.google.firebase.database.ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
String Name;
String Profit;
String Locatio;
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
Farm farm = postSnapshot.getValue(Farm.class);
Name = farm.getName();
Locatio = farm.getLocation();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
System.out.println("ess");
}
答案 0 :(得分：0)
使用
Leaving_Date[, bin := c(7, 14, 30)[ findInterval(n, c(0, 7, 14, 30)) ]]
Id Date n bin
1: 1 2017-01-01 14 days 30
2: 2 2017-02-03 1 days 7
3: 3 2017-01-01 16 days 30
4: 4 2017-03-10 NA days NA
5: 3 2017-02-09 1 days 7
6: 5 2017-02-05 NA days NA
setText方法更改textview的文本，你似乎有一些。 String.valueOf（）适用于bool，int和多个基本java类。它应该做的工作。
答案 1 :(得分：0)
取代recursive来电，从boolean和Expenditu方法返回sale值。
更新您的Expenditu()方法，如下所示：
private boolean Expenditu() {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
DatabaseReference dref = FirebaseDatabase.getInstance().getReference();
String loc = user.getUid();
dref = dref.child(loc + "Expenditure");
dref.addValueEventListener(new com.google.firebase.database.ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
String Name;
String Locatio;
int totalAmount = 0;
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
DogExpenditure dogExpenditure = postSnapshot.getValue(DogExpenditure.class);
totalAmount += dogExpenditure.getAmount();
textView4.setText(Integer.toString(totalAmount));
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
}
return true;
}
更新您的sale()方法，如下所示：
private boolean sale() {
FirebaseUser user = firebaseAuth.getCurrentUser();
DatabaseReference dref = FirebaseDatabase.getInstance().getReference();
String loc = user.getUid();
dref = dref.child(loc + "Sales");
dref.addValueEventListener(new com.google.firebase.database.ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
String Name;
String Locatio;
int totalAmounte = 0;
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
DogExpenditure dogExpenditure = postSnapshot.getValue(DogExpenditure.class);
totalAmounte += dogExpenditure.getAmount();
textView5.setText(Integer.toString(totalAmounte));
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
return true;
}
现在，从onCreate()或其他地方调用方法。
Expenditu();
sale();