java - 如果重新打开应用程序，SharedPreferences 不会保存

Question

如果我重新打开我的游戏，我的 sharedpreferences 不会保存我之前使用 SharedPreferences 保存的数据不会加载，我当前 Activity 的设置再次恢复正常或默认

这是我在 menu.class 中按钮的图像

这是我的 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 中有这段代码，用于从 menu.class 获取默认值

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));
            }

然后如果点击完成按钮会是这样

finishbutton.setOnClickListener(new View.OnClickListener() {

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

所以 levelone.class 完成并返回到 menu.class

SharedPreferences 代码正常工作，my menu.class 中的每个按钮都与代码一起工作并且可见!

但如果我退出应用程序，它会再次恢复正常

有人有办法解决我的问题吗？

Answer 1

onCreate 方法中有以下行:

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();

onCreate 方法在每次 actvity 生命周期需要时运行。尤其是打开应用程序时。因此，每次创建 Activity 时，您都将首选项级别设置为 1。这就是您遇到问题的原因。