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내 코드의 버튼 중 하나에 대해 setOnClickListener 메소드에 문제가 있습니다. 기본적으로 발생하는 것은 setOnClickListener 메서드 내에서 typeFinder를 호출하지만 버튼을 처음 누르면 값이 업데이트되지 않습니다. 나는 디버거를 사용했는데 어떤 일이 일어 났는지는 함수가 호출 되더라도 setOnClickListener가 끝날 때까지 프로그램이 실제로 함수를 거치지 않는다는 것을 의미한다. 즉 두 번째로 버튼을 누를 때 표시 할 값이 올바르다는 것을 의미한다. 이전 버튼 누름에서. TypesTask를 사용해 보았는데 (페이지 하단의 주석 부분에서 볼 수 있듯이), 그렇게하면 같은 결과가 발생합니다. 여기 는 클래스의 코드입니다 : 여기 버튼 setOnClickListener와 관련된 문제
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private DatabaseReference myRef;
private ArrayList<String> recipesList = new ArrayList<String>();
private String[] types = {"pizza", "ice cream", "sandwich", "salad", "steak"};
private void typeFinder(String type) {
myRef.orderByChild("type").equalTo(type).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
// This method is called once with the initial value and again
// whenever data at this location is updated.
String word = "";
boolean wordAdded = false;
String value = dataSnapshot.getValue().toString();
for (int i = 0; i < value.length(); i++) {
if (wordAdded == false) {
if (value.charAt(i) == '=') {
recipesList.add(word);
wordAdded = true;
word = "";
} else if (value.charAt(i) != '{' && value.charAt(i) != ',') {
if (word.length() == 0 && value.charAt(i) == ' ') {
} else {
word = word + value.charAt(i);
}
}
}
if (value.charAt(i) == '}')
if (i + 2 == value.length()) {
wordAdded = false;
break;
} else
wordAdded = false;
}
}
@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.w(TAG, "Failed to read value.", error.toException());
}
});
}
@Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_main);
myRef = FirebaseDatabase.getInstance().getReference();
Button saladsB = (Button) findViewById(R.id.saladButton);
Button pizzaB = (Button) findViewById(R.id.pizzaButton);
Button iceCreamB = (Button) findViewById(R.id.iceCreamButton);
Button steakB = (Button) findViewById(R.id.steakButton);
Button sandwichB = (Button) findViewById(R.id.sandwichButton);
final TextView testTextView = (TextView) findViewById(R.id.test_text_view);
testTextView.setText(Integer.toString(recipesList.size()));
super.onCreate(savedInstanceState);
saladsB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// recipesList.clear();
// t.typeFinder("salad")
typeFinder("salad");
// new TypesTask().execute("salad");
String recipes = "";
for (int i = 0; i < recipesList.size(); i++) {
recipes = recipes + recipesList.get(i) + "\n";
}
testTextView.setText(recipes);
// Intent intent = new Intent(MainActivity.this, ListviewActivity.class);
// intent.putStringArrayListExtra("FOOD_LIST", recipesList);
// startActivity(intent);
}
});
}
/*
public class TypesTask extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
myRef = FirebaseDatabase.getInstance().getReference();
}
@Override
protected Void doInBackground(String... params) {
typeFinder(params[0]);
return null;
}
}
*/
}
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns: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="match_parent"
tools:context="com.example.thevash.recipes.MainActivity">
<LinearLayout
android:layout_width="0dp"
android:layout_height="810dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="458dp"
android:orientation="horizontal"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintTop_creator="1">
<TextView
android:id="@+id/test_text_view"
android:layout_width="585dp"
android:layout_height="248dp"
android:layout_weight="1"
android:text="TextView"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="-377dp" />
</LinearLayout>
<Button
android:id="@+id/saladButton"
android:layout_width="0dp"
android:layout_height="48dp"
android:text="Salads"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="5dp"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/pizzaButton"
android:layout_width="0dp"
android:layout_height="48dp"
android:text="Pizzas"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="52dp"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/iceCreamButton"
android:layout_width="0dp"
android:layout_height="48dp"
android:text="ice cream"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="@+id/pizzaButton"
app:layout_constraintTop_toBottomOf="@+id/pizzaButton"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/pizzaButton" />
<Button
android:id="@+id/steakButton"
android:layout_width="0dp"
android:layout_height="48dp"
android:text="steaks"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="@+id/iceCreamButton"
app:layout_constraintTop_toBottomOf="@+id/iceCreamButton"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/iceCreamButton" />
<Button
android:id="@+id/sandwichButton"
android:layout_width="0dp"
android:layout_height="48dp"
android:text="sandwiches"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
app:layout_constraintRight_toRightOf="@+id/steakButton"
app:layout_constraintTop_toBottomOf="@+id/steakButton"
tools:layout_constraintLeft_creator="1"
app:layout_constraintLeft_toLeftOf="@+id/steakButton" />
</android.support.constraint.ConstraintLayout>
이것을 [mcve]로 줄일 수 있습니까? –
값을 추출하기 위해 데이터베이스에 연결하고 있기 때문에 가능한지 확실하지 않습니다. – siashim
'myRef.orderByChild ("type"). equalTo (type) .addValueEventListener'로 이동하여 onCreate를 초기화하여 작동 여부를 확인하십시오. – kimkevin