我是 android studio 的新手，我尝试了所有可能的选项，但无法理解为什么当我从一个屏幕移动到另一个屏幕时，当我回到上一个屏幕时复选框会被取消选中。
我在onsavedInstanceState或onRestoreInstanceState中遗漏了一些东西
下面是我的Java代码
package com.example.qualitycheckstation;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class Qc2_1_1 extends AppCompatActivity {
CheckBox qc2_1cb1a,qc2_1cb1b,qc2_1cb1c, qc2_1cb2a,qc2_1cb2b,qc2_1cb2c ,qc2_1cb3a,qc2_1cb3b, qc2_1cb3c;
TextView date2_1_1, time2_1_1;
Button next2_1_1,back2_1_1;
Boolean myBoolean1,myBoolean2,myBoolean3,myBoolean4,myBoolean5,myBoolean6,myBoolean7,myBoolean8,myBoolean9;
private static String pr2_1_1,pr2_1_2,pr2_1_3;
private boolean myBoolean = false;
public static String getPr2_1_1 (){
return pr2_1_1;
}
public static String getPr2_1_2 (){
return pr2_1_2;
}
public static String getPr2_1_3(){
return pr2_1_3;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_qc2_1_1);
date2_1_1= findViewById(R.id.date2_1_1);
time2_1_1 = findViewById(R.id.time2_1_1);
Calendar calendar= Calendar.getInstance();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MM-yyyy");
String date = simpleDateFormat.format(calendar.getTime());
date2_1_1.setText(date);
SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("hh:mm:ss a");
String time0 = simpleDateFormat1.format(calendar.getTime());
time2_1_1.setText(time0);
qc2_1cb1a = findViewById(R.id.qc2_1cb1a);
qc2_1cb1b = findViewById(R.id.qc2_1cb1b);
qc2_1cb1c = findViewById(R.id.qc2_1cb1c);
qc2_1cb2a = findViewById(R.id.qc2_1cb2a);
qc2_1cb2b = findViewById(R.id.qc2_1cb2b);
qc2_1cb2c = findViewById(R.id.qc2_1cb2c);
qc2_1cb3a = findViewById(R.id.qc2_1cb3a);
qc2_1cb3b = findViewById(R.id.qc2_1cb3b);
qc2_1cb3c = findViewById(R.id.qc2_1cb3c);
next2_1_1 = findViewById(R.id.next2_1_1);
back2_1_1 = findViewById(R.id.back2_1_1);
next2_1_1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if((qc2_1cb1a.isChecked())){
pr2_1_1 = "O";
}
else if((qc2_1cb1b.isChecked())){
pr2_1_1 = "X";
}
else if((qc2_1cb1c.isChecked())){
pr2_1_1 = "N/A";
}
if((qc2_1cb2a.isChecked())){
pr2_1_2 = "O";
}
else if((qc2_1cb2b.isChecked())){
pr2_1_2 = "X";
}
else if((qc2_1cb2c.isChecked())){
pr2_1_2 = "N/A";
}
if((qc2_1cb3a.isChecked())){
pr2_1_3 = "O";
}
else if((qc2_1cb3b.isChecked())){
pr2_1_3 = "X";
}
else if((qc2_1cb3c.isChecked())){
pr2_1_3 = "N/A";
}
if (
((qc2_1cb1a.isChecked()) && (qc2_1cb1b.isChecked())) || ((qc2_1cb1b.isChecked()) && (qc2_1cb1c.isChecked())) || ((qc2_1cb1a.isChecked()) && (qc2_1cb1c.isChecked())) ||
((qc2_1cb2a.isChecked()) && (qc2_1cb2b.isChecked())) || ((qc2_1cb2b.isChecked()) && (qc2_1cb2c.isChecked())) || ((qc2_1cb2a.isChecked()) && (qc2_1cb2c.isChecked())) ||
((qc2_1cb3a.isChecked()) && (qc2_1cb3b.isChecked())) || ((qc2_1cb3b.isChecked()) && (qc2_1cb3c.isChecked())) || ((qc2_1cb3a.isChecked()) && (qc2_1cb3c.isChecked()))
)
{ { Toast.makeText(getApplicationContext(),"Select Either OK, NG or N/A", Toast.LENGTH_SHORT).show(); }}
else if (
((qc2_1cb1a.isChecked()) || (qc2_1cb1b.isChecked()) || (qc2_1cb1c.isChecked())) &&
((qc2_1cb2a.isChecked()) || (qc2_1cb2b.isChecked()) || (qc2_1cb2c.isChecked()))&&
((qc2_1cb3a.isChecked()) || (qc2_1cb3b.isChecked()) || (qc2_1cb3c.isChecked()))
)
{ Intent intent = new Intent(Qc2_1_1.this, Qc2_1_2.class);startActivity(intent); }
else { Toast.makeText(getApplicationContext(),"Select all parameters", Toast.LENGTH_SHORT).show(); }
}
});
back2_1_1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Qc2_1_1.this, Qc2.class);
startActivity(intent);
}
});
}
@Override
protected void onSaveInstanceState(@NonNull Bundle outState) {
super.onSaveInstanceState(outState);
outState.putBoolean("qc2_1cb1a", qc2_1cb1a.isChecked());
outState.putBoolean("qc2_1cb1b", qc2_1cb1b.isChecked());
outState.putBoolean("qc2_1cb1c", qc2_1cb1c.isChecked());
outState.putBoolean("qc2_1cb2a", qc2_1cb2a.isChecked());
outState.putBoolean("qc2_1cb2b", qc2_1cb2b.isChecked());
outState.putBoolean("qc2_1cb2c", qc2_1cb2c.isChecked());
outState.putBoolean("qc2_1cb3a", qc2_1cb3a.isChecked());
outState.putBoolean("qc2_1cb3b", qc2_1cb3b.isChecked());
outState.putBoolean("qc2_1cb3c", qc2_1cb3c.isChecked());
}
@Override
protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
myBoolean1 = savedInstanceState.getBoolean("qc2_1cb1a");
myBoolean2 = savedInstanceState.getBoolean("qc2_1cb1b");
myBoolean3 = savedInstanceState.getBoolean("qc2_1cb1c");
myBoolean4 = savedInstanceState.getBoolean("qc2_1cb2a");
myBoolean5 = savedInstanceState.getBoolean("qc2_1cb2b");
myBoolean6 = savedInstanceState.getBoolean("qc2_1cb2c");
myBoolean7 = savedInstanceState.getBoolean("qc2_1cb3a");
myBoolean8 = savedInstanceState.getBoolean("qc2_1cb3b");
myBoolean9 = savedInstanceState.getBoolean("qc2_1cb3c");
qc2_1cb1a.setChecked(myBoolean1);
qc2_1cb1b.setChecked(myBoolean2);
qc2_1cb1c.setChecked(myBoolean3);
qc2_1cb2a.setChecked(myBoolean4);
qc2_1cb2b.setChecked(myBoolean5);
qc2_1cb2c.setChecked(myBoolean6);
qc2_1cb3a.setChecked(myBoolean7);
qc2_1cb3b.setChecked(myBoolean8);
qc2_1cb3c.setChecked(myBoolean9);
}
}
xml代码
<TableLayout
android:layout_width="match_parent"
android:layout_height="462dp"
android:layout_marginStart="15dp"
android:layout_marginTop="125dp"
android:layout_marginEnd="15dp"
android:background="@color/black"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="70dp"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:gravity="center"
android:text="Sl No"
android:textColor="@color/black"
android:textSize="25dp"
android:textStyle="bold" />
<TextView
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.25"
android:background="#a3addb"
android:gravity="center"
android:text="Measured Item"
android:textColor="@color/black"
android:textSize="25dp"
android:textStyle="bold" />
<TextView
android:layout_width="199dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.25"
android:background="#a3addb"
android:gravity="center"
android:text="OP No"
android:textColor="@color/black"
android:textSize="25dp"
android:textStyle="bold" />
<TextView
android:layout_width="200dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="2"
android:background="#a3addb"
android:gravity="center"
android:text="Gauge Used"
android:textColor="@color/black"
android:textSize="25dp"
android:textStyle="bold" />
<TextView
android:layout_width="25dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.5"
android:background="#a3addb"
android:gravity="center"
android:text="Parameter"
android:textColor="@color/black"
android:textSize="25dp"
android:textStyle="bold" />
<TextView
android:layout_width="91dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:gravity="center"
android:text="OK"
android:textColor="@color/black"
android:textSize="25dp"
android:textStyle="bold" />
<TextView
android:layout_width="92dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:gravity="center"
android:text="NG"
android:textColor="@color/black"
android:textSize="25dp"
android:textStyle="bold" />
<TextView
android:layout_width="96dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:gravity="center"
android:text="N/A"
android:textColor="@color/black"
android:textSize="25dp"
android:textStyle="bold" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="125dp"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:gravity="center"
android:text="1."
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.25"
android:background="#a3addb"
android:gravity="center"
android:text="Groove Surface"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.25"
android:background="#a3addb"
android:gravity="center"
android:text="25"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="200dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="2"
android:background="#a3addb"
android:gravity="center"
android:text=" Visual"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="131dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.5"
android:background="#a3addb"
android:gravity="center"
android:text="Exist"
android:textColor="@color/black"
android:textSize="25dp" />
<CheckBox
android:id="@+id/qc2_1cb1a"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_green" />
<CheckBox
android:id="@+id/qc2_1cb1b"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_red" />
<CheckBox
android:id="@+id/qc2_1cb1c"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_red" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="125dp"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:gravity="center"
android:text="2."
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="291dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.25"
android:background="#a3addb"
android:gravity="center"
android:text="Serial Engraving Surface"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="291dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.25"
android:background="#a3addb"
android:gravity="center"
android:text="30"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="41dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="2"
android:background="#a3addb"
android:gravity="center"
android:text=" Visual"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.5"
android:background="#a3addb"
android:gravity="center"
android:text="Numbers should be readable"
android:textColor="@color/black"
android:textSize="25dp" />
<CheckBox
android:id="@+id/qc2_1cb2a"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_green" />
<CheckBox
android:id="@+id/qc2_1cb2b"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_red" />
<CheckBox
android:id="@+id/qc2_1cb2c"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_red" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="125dp"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:gravity="center"
android:text="3."
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="251dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.25"
android:background="#a3addb"
android:gravity="center"
android:text="Machining Surface"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="251dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.25"
android:background="#a3addb"
android:gravity="center"
android:text="25"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="31dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="2"
android:background="#a3addb"
android:gravity="center"
android:text=" Visual"
android:textColor="@color/black"
android:textSize="25dp" />
<TextView
android:layout_width="328dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight="1.5"
android:background="#a3addb"
android:gravity="center"
android:text="No rough surface, unwash surface,scratch, burr"
android:textColor="@color/black"
android:textSize="25dp" />
<CheckBox
android:id="@+id/qc2_1cb3a"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_green" />
<CheckBox
android:id="@+id/qc2_1cb3b"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_red" />
<CheckBox
android:id="@+id/qc2_1cb3c"
android:layout_width="64dp"
android:layout_height="match_parent"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:layout_weight=".25"
android:background="#a3addb"
android:button="@drawable/checkbox_red" />
</TableRow>
</TableLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="360dp"
android:layout_marginTop="32dp"
android:text="QC Station 2.1"
android:textColor="@color/black"
android:textSize="50dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:layout_width="211dp"
android:layout_height="68dp"
android:layout_marginStart="25dp"
android:layout_marginTop="25dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/logo" />
<TextView
android:id="@+id/date2_1_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="35dp"
android:layout_marginEnd="50dp"
android:ems="6"
android:hint="DD/MM/YYYY"
android:inputType="date"
android:textSize="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/time2_1_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="70dp"
android:layout_marginEnd="50dp"
android:ems="6"
android:hint="HH.MM.SS"
android:inputType="time"
android:textSize="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/next2_1_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="25dp"
android:layout_marginBottom="30dp"
android:background="@drawable/button"
android:text="next"
android:textColor="@color/white"
android:textSize="25dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<Button
android:id="@+id/back2_1_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="25dp"
android:layout_marginBottom="30dp"
android:background="@drawable/button"
android:text="Back"
android:textColor="@color/white"
android:textSize="25dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
任何解决此问题的支持都会有很大帮助