我想保存复选框的旧状态我想在数据库中更新我的数据。当用户更改活动时，我将丢失其选中的复选框，当他再次访问该活动时，则取消选中每个复选框，当他单击以使用新值保存时，它将不会保存，因为我将日期设置为数据库中的主键。如果我用新值更新数据，我丢失了旧数据....
CheckBoxActivity.java
package com.example.shakeelmughal.assanislam;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.preference.PreferenceManager;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;
import java.text.SimpleDateFormat;
import java.util.Date;
public class NamazCounterActivity extends AppCompatActivity {
DatabaseHelper mydb;
CheckBox cb1,cb2,cb3,cb4,cb5;
Button B1,B2,B3;
int vcb1=0,vcb2=0,vcb3=0,vcb4=0,vcb5=0,vet=0;
Date date = new Date();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_namaz_counter);
mydb = new DatabaseHelper(this);
SharedPreferences settings = getSharedPreferences("mysettings", 0);
SharedPreferences.Editor editor = settings.edit();
cb1 = findViewById(R.id.namaz1);
cb2 = findViewById(R.id.namaz2);
cb3 = findViewById(R.id.namaz3);
cb4 = findViewById(R.id.namaz4);
cb5 = findViewById(R.id.namaz5);
B1 = findViewById(R.id.result);
B2 = (Button) findViewById(R.id.dateee);
B3 = findViewById(R.id.sumr);
c_date();
B1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
InsertingData();
}
});
B3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Cursor cr = mydb.getAllData();
if(cr.getCount() == 0)
{
showData("Error","No Data Found");
return;
}
StringBuffer buffer = new StringBuffer();
while (cr.moveToNext())
{
buffer.append("ID: "+cr.getString(0)+ "\n");
buffer.append("Fajar: "+cr.getString(1)+ "\n");
buffer.append("Zohr: "+cr.getString(2)+ "\n");
buffer.append("Asr: "+cr.getString(3)+ "\n");
buffer.append("Magrib: "+cr.getString(2)+ "\n");
buffer.append("Isha: "+cr.getString(3)+ "\n");
}
showData("Data",buffer.toString());
}
});
//home button
if (getSupportActionBar() != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}}
//function for going back to previous activity
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == android.R.id.home)
finish();
return super.onOptionsItemSelected(item);
}
public void InsertingData()
{
if(cb1.isChecked())
{
vcb1 = 1;
}
else
{
vcb1 = 0;
}
if(cb2.isChecked())
{
vcb2 = 1;
cb2.setChecked(true);
}
else
{
vcb2 = 0;
}
if(cb3.isChecked())
{
vcb3 = 1;
cb3.setChecked(true);
}
else
{
vcb3 = 0;
}
if(cb4.isChecked())
{
vcb4 = 1;
cb4.setChecked(true);
}
else
{
vcb4 = 0;
}
if(cb5.isChecked())
{
vcb5 = 1;
cb5.setChecked(true);
}
else
{
vcb5 = 0;
}
boolean result = mydb.InsertData(B2.getText().toString(),Integer.toString(vcb1),Integer.toString(vcb2),Integer.toString(vcb3),Integer.toString(vcb4),Integer.toString(vcb5));
if(result == true)
{
Toast.makeText(NamazCounterActivity.this, "Prayer Saved",Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(NamazCounterActivity.this, "Some Error", Toast.LENGTH_LONG).show();
}
}
public void Updateingdata()
{
if(cb1.isChecked())
{
vcb1 = 1;
}
else
{
vcb1 = 0;
}
if(cb2.isChecked())
{
vcb2 = 1;
}
else
{
vcb2 = 0;
}
if(cb3.isChecked())
{
vcb3 = 1;
}
else
{
vcb3 = 0;
}
if(cb4.isChecked())
{
vcb4 = 1;
}
else
{
vcb4 = 0;
}
if(cb5.isChecked())
{
vcb5 = 1;
}
else
{
vcb5 = 0;
}
boolean res = mydb.UpdateData(B2.getText().toString(),Integer.toString(vcb1),Integer.toString(vcb2),Integer.toString(vcb3),Integer.toString(vcb4),Integer.toString(vcb5));
if(res == true)
{
Toast.makeText(NamazCounterActivity.this,"Data Updated",Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(NamazCounterActivity.this,"Data Not Updated",Toast.LENGTH_SHORT).show();
}
}
//for date ()
public void c_date()
{
date.setTime(System.currentTimeMillis()); //set to current time
B2.setText(date.toString());
SimpleDateFormat dateFormat = new SimpleDateFormat("EEEEEEEEE, MMM dd, yyyy");
B2.setText(dateFormat.format(date));
}
public void showData(String title, String message)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(message);
builder.show();
}
}
其XML文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
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.shakeelmughal.assanislam.NamazCounterActivity">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/scrollView2">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<CheckBox
android:id="@+id/namaz1"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="47dp"
android:layout_marginStart="47dp"
android:layout_marginTop="50dp"
android:background="?android:attr/listChoiceIndicatorMultiple"
android:button="@null"
android:theme="@style/forCheckBox" />
<CheckBox
android:id="@+id/namaz2"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignLeft="@+id/namaz1"
android:layout_alignStart="@+id/namaz1"
android:layout_below="@+id/namaz1"
android:layout_marginTop="12dp"
android:button="@null"
android:background="?android:attr/listChoiceIndicatorMultiple"
android:theme="@style/forCheckBox" />
<CheckBox
android:id="@+id/namaz3"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignLeft="@+id/namaz2"
android:layout_alignStart="@+id/namaz2"
android:layout_below="@+id/namaz2"
android:layout_marginTop="19dp"
android:button="@null"
android:background="?android:attr/listChoiceIndicatorMultiple"
android:theme="@style/forCheckBox" />
<CheckBox
android:id="@+id/namaz4"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignLeft="@+id/namaz3"
android:layout_alignStart="@+id/namaz3"
android:layout_below="@+id/namaz3"
android:layout_marginTop="19dp"
android:button="@null"
android:background="?android:attr/listChoiceIndicatorMultiple"
android:theme="@style/forCheckBox" />
<CheckBox
android:id="@+id/namaz5"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignLeft="@+id/namaz4"
android:layout_alignStart="@+id/namaz4"
android:layout_below="@+id/namaz4"
android:layout_marginTop="11dp"
android:button="@null"
android:background="?android:attr/listChoiceIndicatorMultiple"
android:theme="@style/forCheckBox" />
<TextView
android:id="@+id/textView20"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/namaz1"
android:layout_alignBottom="@+id/namaz1"
android:layout_marginLeft="41dp"
android:layout_marginStart="41dp"
android:layout_toEndOf="@+id/result"
android:layout_toRightOf="@+id/result"
android:text="نمازِ فجر"
android:textColor="#000"
android:textSize="20sp" />
<TextView
android:id="@+id/textView21"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/textView20"
android:layout_alignRight="@+id/textView20"
android:layout_alignTop="@+id/namaz2"
android:layout_marginTop="14dp"
android:text=" نمازِ ظہر / جمعہ"
android:textColor="#000"
android:textSize="20sp" />
<TextView
android:id="@+id/textView22"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/textView21"
android:layout_alignRight="@+id/textView21"
android:layout_alignTop="@+id/namaz3"
android:layout_marginTop="11dp"
android:text="نمازِ عصر"
android:textColor="#000"
android:textSize="20sp" />
<TextView
android:id="@+id/textView23"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/namaz4"
android:layout_alignBottom="@+id/namaz4"
android:layout_alignEnd="@+id/textView21"
android:layout_alignRight="@+id/textView21"
android:text="نمازِ مغرب"
android:textColor="#000"
android:textSize="20sp" />
<TextView
android:id="@+id/textView24"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/textView23"
android:layout_alignRight="@+id/textView23"
android:layout_alignTop="@+id/namaz5"
android:layout_marginTop="12dp"
android:text="نمازِ عشاء"
android:textColor="#000"
android:textSize="20sp"/>
<Button
android:id="@+id/result"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView24"
android:layout_centerHorizontal="true"
android:text="Save" />
<Button
android:id="@+id/dateee"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView20"
android:layout_centerHorizontal="true" />
<Button
android:id="@+id/sumr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/result"
android:layout_centerHorizontal="true"
android:layout_marginTop="13dp"
android:text="View Summery" />
</RelativeLayout>
</ScrollView>
</RelativeLayout>
答案 0 :(得分：0)
可能有很多方法可以做到这一点，其中一些是：
<强> 1。使用文件
<强> 2。使用共享偏好
我会建议后一个，一个伟大的实现可以找到 的 Save CheckBox State to SharedPreferences File in Android