[英]how to Save Inputted Values from Edittext into Array?
I am making a program to get Values from edittext and store it in an array then I want to display that array on screen and here is my command我正在制作一个程序以从 edittext 获取值并将其存储在一个数组中,然后我想在屏幕上显示该数组,这是我的命令
EditText ed1,ed2;
RadioButton rd1,rd2,rd3,rd4,rd5;
Button btn1;
TextView tvkq;
String X=ed2.getText().toString();
int soX=Integer.parseInt(X);
String dayso=ed1.getText().toString().trim();
int soN=Integer.parseInt(dayso);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
anhxa();
btn1.setOnClickListener(view -> {
ed1.setText(" ");
ArrayList<String> arryList = new ArrayList<String>();
arryList.add(ed1.getText().toString());
if (rd1.isChecked()){
tvkq.setText("Kêt quả:"+arryList);
}
});
}
When I run the program, I got an error, please help me当我运行程序时,出现错误,请帮助我
Try this尝试这个
public class MainActivity extends AppCompatActivity {公共 class MainActivity 扩展 AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
EditText ed1 = findViewById(R.id.et1);
Button btn1 = findViewById(R.id.btn1);
TextView tvkq = findViewById(R.id.tvkq);
btn1.setOnClickListener(view -> {
ArrayList<String> arryList = new ArrayList<String>();
arryList.add(ed1.getText().toString());
tvkq.setText("Kêt quả:"+arryList);
});
}
}
And the xml file和 xml 文件
<?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/tvkq"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@id/tvkq"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
<EditText
android:id="@+id/et1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp"
app:layout_constraintBottom_toTopOf="@id/tvkq"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
First problem in your code will be trying to get values from view without initialisation even before XML file is loaded in your activity.您的代码中的第一个问题是,即使在您的活动中加载 XML 文件之前,也将尝试在不初始化的情况下从视图中获取值。
Solution: You suppose to initialize your views under onCreate() and below setContentView(R.layout.activity_main) methods, by providing correct view Id as following;解决方案:您假设在 onCreate() 和 setContentView(R.layout.activity_main) 方法下初始化您的视图,方法是提供正确的视图 ID,如下所示;
EditText ed1,ed2;
RadioButton rd1,rd2,rd3,rd4,rd5;
Button btn1;
TextView tvkq;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edt1 = findViewById(R.id.edt1);
edt2 = findViewById(R.id.edt2);
btn1 = findViewById(R.id.btn1);
......//Initialize other views
}
Second you are clearing text from your edit text before adding it to an array and also declare and initialize ArrayList outside click Listener.其次,您在将编辑文本添加到数组之前从编辑文本中清除文本,并在点击侦听器外部声明和初始化 ArrayList。
EditText ed1,ed2;
RadioButton rd1,rd2,rd3,rd4,rd5;
Button btn1;
TextView tvkq;
ArrayList<String> arryList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edt1 = findViewById(R.id.edt1);
edt2 = findViewById(R.id.edt2);
btn1 = findViewById(R.id.btn1)
......//Initialise other views
arryList = new ArrayList<String>();
btn1.setOnClickListener(view -> {
arryList.add(ed1.getText().toString());
if (rd1.isChecked()){
tvkq.setText("Kêt quả:"+arryList.toString());
}
ed1.setText(" ");
});
}
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