Question

我的项目中的共享偏好有一些问题，即共享偏好没有从另一个活动接收到int值

有两个类：menu.class和levelone.class

我在menu.class

中有以下代码

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.menu);
        SharedPreferences pref = getSharedPreferences("SavedGame", MODE_PRIVATE); 
        SharedPreferences.Editor editor = pref.edit();      
        editor.putInt("Lifes", 6);
        editor.putInt("Hints", 6);          
        editor.putInt("Level", 1);  
        editor.commit();

     f1=(Button)findViewById(R.id.f1);

     f2=(Button)findViewById(R.id.f2);
     f2lock=(ImageView)findViewById(R.id.f2lock);


   f1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v){
                // TODO Auto-generated method stub
                Intent i =new Intent(menu.this, levelone.class);
                startActivity(i);             
            }             
        }); 

    f2.setOnClickListener(new View.OnClickListener() {

         @Override
         public void onClick(View v){
           // TODO Auto-generated method stub
              Intent i =new Intent(menu.this, leveltwo.class);
              startActivity(i);          
            }             
      });

    f3=(Button)findViewById(R.id.f3);
    f3lock=(ImageView)findViewById(R.id.f3lock);

 //this the code to receive int value from another activity

   levelunlocked = pref.getInt("Level", 0); 

   if(levelunlocked == 2)

    {
        f2.setVisibility(View.VISIBLE);
        f2lock.setVisibility(View.GONE);
    }
    if(levelunlocked == 3)

    {
        f3.setVisibility(View.VISIBLE);
        f3lock.setVisibility(View.GONE);
    }   
}

我在levelone.class中使用此代码来获取menu.class

的默认值

int gamelifes, gamehints, gamelevel, index=0; 


SharedPreferences pref = getSharedPreferences("SavedGame", MODE_PRIVATE);
gamelifes = pref.getInt("Lifes", 0);
gamehints = pref.getInt("Hints", 0);
gamelevel = pref.getInt("Level", 0);

//the value from sharedpreferences is use to be a text by use code below

lifes1 =(TextView)findViewById(R.id.lifestext1);
lifes1.setTextColor(Color.RED);
lifes1.setText(String.valueOf(gamelifes));   

hints1 =(TextView)findViewById(R.id.hintstext1);
hints1.setTextColor(Color.GRAY);
hints1.setText(String.valueOf(gamehints));

并使用新数据保存共享偏好

String answer=edittextanswer1.getText().toString();              
            if(answer.equalsIgnoreCase(answer1[index]))
            {
                gamelevel++;                
                image.setVisibility(View.GONE); 
                finishbutton.setVisibility(View.VISIBLE);  
                SharedPreferences pref = getSharedPreferences("SavedGame", MODE_PRIVATE); 
                SharedPreferences.Editor editor = pref.edit();      
                editor.putInt("Lifes", gamelifes);
                editor.putInt("Hints", gamehints);          
                editor.putInt("Level", gamelevel);  
                editor.commit();
            else
            {    
            tryagain1.setVisibility(View.VISIBLE);
            gamelifes--;
            lifes1.setText(String.valueOf(gamelifes));
            }

然后，如果单击完成按钮，它将是这样的

    finishbutton.setOnClickListener(new View.OnClickListener() {

          public void onClick(View v){
              finish();
          }
       });

所以levelone.class已完成并返回menu.class

但是sharedpreferences检索的值代码不起作用

//this the code to receive int value from another activity

   levelunlocked = pref.getInt("Level", 0); 

   if(levelunlocked == 2)

    {
        f2.setVisibility(View.VISIBLE);
        f2lock.setVisibility(View.GONE);
    }
    if(levelunlocked == 3)

    {
        f3.setVisibility(View.VISIBLE);
        f3lock.setVisibility(View.GONE);
    }   
}

任何人都可以给出一些解决方案吗？

Answer 1

您已在onCreate()中添加了检索代码。当您从menu参加活动levalone时，系统不会调用此方法。

在onResume()

中添加以下代码

//this the code to receive int value from another activity

levelunlocked = pref.getInt("Level", 0); 

if(levelunlocked == 2)
{
    f2.setVisibility(View.VISIBLE);
    f2lock.setVisibility(View.GONE);
}
if(levelunlocked == 3)
{
    f3.setVisibility(View.VISIBLE);
    f3lock.setVisibility(View.GONE);
}

SharedPreferences无法检索int值

1 个答案: