[英]How to set value of integer inside of TextView element?
int x
和int y
的新值時,我都希望有一個TextView
元素更新。Correct answer
文本和False answer
文本不會顯示在日志中,但也作為textView
元素顯示。x
* y
(答案是z
)x
、 y
和z
z
和answer
的代碼(用戶的答案)textView
元素顯示“ x
* y
”(其中x
和y
應為textView
內的整數)並在每次x
和y
值更新后更新Correct
或Incorrect
,因為另一個textView
元素顯示在Button
元素下而不是日志條目下MainActivity.java
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import java.util.Random;
public class MainActivity extends AppCompatActivity {
private EditText textBox;
private int z , answer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textBox=findViewById(R.id.editText);
setActual();
}
private void setActual(){
Random random = new Random();
int[] firstNum = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
int x = firstNum[random.nextInt(firstNum.length)];/*Here program should put a random number out of firstNum array*/
int[] secondNum = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
int y = secondNum[random.nextInt(secondNum.length)];/*Here program should put a random number out of secondNum array*/
z = x*y;
}
public void onCheck(View view){
this.answer = Integer.parseInt(textBox.getText().toString());
if(answer == z){
Log.d("TAG", "Correct."); // right answer
}
else{
Log.d("TAG", "Incorrect."); // wrong answer
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:hint="Enter you guess"
android:inputType="numberDecimal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.333"
tools:layout_editor_absoluteX="0dp" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Check"
android:layout_margin="20dp"
android:onClick="onCheck"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
解決方案:在您的view
中再添加兩個TextView
並相應地更新它們。
您不必使用數字數組來獲取隨機數。只需使用帶有bound
作為參數的隨機數。 (雖然這是可選的,但基於數組的方法也很好)。
活動:
/* package & imports.. */
public class MainActivity extends AppCompatActivity {
private EditText textBox;
private int z, answer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textBox = findViewById(R.id.editText);
setActual();
}
private void setActual() {
Random random = new Random();
int x = random.nextInt(10) + 1; //you get a random number between 0 and 9 then add 1 to get 1 - 10, no need to use array..
int y = random.nextInt(10) + 1;
z = x * y;
String hintStr = x + " * " + y;
((TextView) findViewById(R.id.hintTextView)).setText(hintStr);
}
public void onCheck(View view) {
this.answer = Integer.parseInt(textBox.getText().toString());
String res = "Incorrect";
if (answer == z) {
res = "Correct";
Log.d("TAG", "Correct."); // right answer
setActual(); // let's regenerate values
} else {
Log.d("TAG", "Incorrect."); // wrong answer
}
((TextView) findViewById(R.id.result_text_view)).setText(res);
}
}
你的觀點:剛剛添加了 2 個文本視圖,第一個是你所說的將x * y
都表示為整數,另一個是顯示結果。
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity">
<TextView
android:id="@+id/hintTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="x * y"
app:layout_constraintBottom_toTopOf="@+id/editText"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:hint="Enter you guess"
android:inputType="numberDecimal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.333"
tools:layout_editor_absoluteX="0dp" />
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:onClick="onCheck"
android:text="Check"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="20dp" />
<TextView
android:id="@+id/result_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Result"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button"
app:layout_constraintVertical_bias="0.316" />
</androidx.constraintlayout.widget.ConstraintLayout>
在onCreate
方法中,使用其 ID 獲取對TextView
的引用,就像您對EditText
所做的一樣。 然后,在您的x
、 y
和z
變量以及任何其他變量的值發生變化后,將文本設置為您的 TextView ,如下所示:
textView.setText("" + x + " * " + y + " = " + z);
answerIsCorrectText.setText("" + (x*y=z)? "Correct:": "Incorrect;(");
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