Question

我的共享偏好不会保存，如果我重新打开我的游戏，之前我使用SharedPreferences保存的数据未加载，我当前活动的设置再次恢复正常或默认

这是menu.class

中我的按钮的图像

这是我menu.class

的以下代码

@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);

}
public void onResume() {
super.onResume();

   SharedPreferences pref = getSharedPreferences("SavedGame", MODE_PRIVATE); 
   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.Editor editor = pref.edit();
       editor.putInt("Level", levelunlocked);
       editor.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.splashscreen, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

我在levelone.class中使用了此代码来获取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

和SharedPreferences代码正常工作，my menu.class中的每个按钮都可以使用代码并且可见！

但如果我退出应用程序，它又恢复正常

任何人都有解决方案来解决我的问题吗？

Answer 1

您的onCreate方法中有以下几行：

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();

每次动作生命周期需要时都会运行onCreate方法。特别是在打开应用程序时。因此，每次创建活动时，都会将首选项级别设置为1。这就是你问题的原因。

Answer 2

事情是，在onCreate()方法中，您始终重置共享首选项：

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();

只需检查此文件是否已存在于具有if语句的该行之前。这应该可以解决问题。

类似的东西：

if (pref.contains("Level")) {
    // Do not reset
}
else {
    // Create the prefs
    SharedPreferences.Editor editor = pref.edit();      
    editor.putInt("Lifes", 6);
    editor.putInt("Hints", 6);          
    editor.putInt("Level", 1);  
    editor.commit();
}

您不必检查确切的字段，这只是一个示例。根据您的需求和游戏逻辑进行调整。

查看Activity生命周期，了解发生这种情况的原因。

每当您打开应用时，都会调用onCreate()方法，因此您的首选项会在您阅读之前重置。

有关生命周期的更多信息here。

编辑：以下snnipet显示了解决问题的一种方法。

public static final String PREF_LIFES = "Lifes";
public static final String PREF_HINTS = "Hints";
public static final String PREF_LEVEL = "Level";
public static final String PREF_IS_SET = "isSet";


@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); 

    // Check wether the pref is set or not.
    if (pref.getBoolean(PREF_IS_SET.false)) {
        // The prefs is set. Do some game logic here. Like checking for lifes.
        if (pref.getInt(PREF_LIFES,0) == 0) {
            // Player is "dead", reset it.
            resetPrefs(pref); 
        }
        else {
            // Player is alive, do whatever you want, or do nothing at all.
        }
    }
    else {
        // if it's not set, just create it.
        resetPrefs(pref);
    }

    // ...   
}

private void resetPrefs(SharedPreferences pref) {
    SharedPreferences.Editor editor = pref.edit();      
    editor.putInt(PREF_LIFES, 6);
    editor.putInt(PREF_HINTS, 6);          
    editor.putInt(PREF_LEVEL, 1);
    editor.putBoolean(PREF_IS_SET,true);
    editor.commit();
}

编辑2 ：您也可以将此逻辑放在onResume()方法上，只要您将其从onCreate()中移除，否则您将检查这些逻辑条件两次;）

Answer 3

我认为您没有在Menu.class中检查共享首选项的存在值。您只需分配一个默认值，而无需正确检查共享首选项是否包含数据。在onCreate

在Menu.class的OnCreate上尝试这个

SharedPreferences.Editor editor = pref.edit();   
//check it with your default value.I used default value as 0   
int lifes=pref.getInt("Lifes", 0);
if(lifes==0)
editor.putInt("Lifes", 6);
//check it with your default value.I used default value as 0 
 int hints=pref.getInt("Hints", 0);
 if(hints==0
 editor.putInt("Hints", 6);          
 //check it with your default value.I used default value as 0
  int level=pref.getInt("Level", 0);
  if(level==0)
  editor.putInt("Level", 1);  
  editor.commit();

Answer 4

发生这种情况是因为当您启动应用程序时，menu.class会重置或通过menu.class文件onCreate（）中的代码提交共享首选项数据，如下所示：

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();

您需要首先检查共享首选项名称是否已提供共享首选项，如果没有，则初始化共享首选项代码如下：

if() // Check your shared preferences already not available then initialise it
{
     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();
}

Answer 5

每次创建活动时，您都要重置已保存的Preferences：

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();

您应该只在更改时Preferences保存。

如果应用程序重新打开，则SharedPreferences不会保存

5 个答案: