保存复选框状态

Question

我很新,如果有人可以演示在android应用程序中保存java中的许多复选框状态所需的代码,我将不胜感激.

假设我有一个用户需要完成任务的工具列表(十个或更多),并希望他们能够检查每个工具并保存该数据(在应用程序内,而不是sQlite),以便在他们回到申请表.

我知道如何完成这项工作,但我觉得我需要看到正确理解的代码.

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.CheckBox;

public class CheckBoxTest extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.checkboxtest);
    CheckBox cb1,cb2,cb3,cb4;

    cb1 = (CheckBox)findViewById(R.id.checkBox1);
    cb2 = (CheckBox)findViewById(R.id.checkBox2);
    cb3 = (CheckBox)findViewById(R.id.checkBox3);
    cb4 = (CheckBox)findViewById(R.id.checkBox4);   
     }
 }

Answer 1

使用以下代码存储和检索SharedPreference中的数据.您在SharedPreference中保存每个复选框状态

//从SharedPreference获取值

SharedPreferences preferences = getApplicationContext().getSharedPreferences("PROJECT_NAME", android.content.Context.MODE_PRIVATE);
boolean value = preferences.getBoolean("KEY", false);
String value = preferences.getString("KEY");

//在SharedPreference中保存值

SharedPreferences preferences = getApplicationContext().getSharedPreferences("PROJECT_NAME", android.content.Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("KEY", value);
editor.putBoolean("KEY", value);
editor.commit();

看看它的一些小变化::::

public class CheckBoxTest extends Activity implements OnCheckedChangeListener {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.favorites_add_button);
            CheckBox cb1,cb2,cb3,cb4;

            cb1 = (CheckBox)findViewById(R.id.checkBox1);
            cb1.setChecked(getFromSP("cb1"));
            cb1.setOnCheckedChangeListener(this);
            cb2 = (CheckBox)findViewById(R.id.checkBox2);
            cb2.setChecked(getFromSP("cb2"));
            cb2.setOnCheckedChangeListener(this);
            cb3 = (CheckBox)findViewById(R.id.checkBox3);
            cb3.setChecked(getFromSP("cb3"));
            cb3.setOnCheckedChangeListener(this);
            cb4 = (CheckBox)findViewById(R.id.checkBox4);
            cb4.setChecked(getFromSP("cb4"));
            cb4.setOnCheckedChangeListener(this);

        }
        private boolean getFromSP(String key){
        SharedPreferences preferences = getApplicationContext().getSharedPreferences("PROJECT_NAME", android.content.Context.MODE_PRIVATE);
        return preferences.getBoolean(key, false);
        }
        private void saveInSp(String key,boolean value){
        SharedPreferences preferences = getApplicationContext().getSharedPreferences("PROJECT_NAME", android.content.Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = preferences.edit();
        editor.putBoolean(key, value);
        editor.commit();
        }
        @Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {
            // TODO Auto-generated method stub
            switch(buttonView.getId()){
            case R.id.checkBox1:
            saveInSp("cb1",isChecked);
            break;
            case R.id.checkBox2:
            saveInSp("cb2",isChecked);
            break;

            case R.id.checkBox3:
            saveInSp("cb3",isChecked);
            break;

            case R.id.checkBox4:
            saveInSp("cb4",isChecked);
            break;
            }

        }
        }