android - 访问函数外部的全局值

Question

我正在尝试在函数中设置一个值(全局)并在android中的“On create()”函数外部访问它 我尝试将全局变量设为静态，甚至尝试将其写入“编辑文本”并在“on create()”中解析它。但它一直初始化为0.0(变量是double类型) 当我尝试在“on create()”中访问时，

哦，我无法返回该值，因为该函数太嵌套，因此所有层次结构都太复杂。 :(

谁能帮我解决这个问题；

    public class TryActivity extends Activity
    {
        double BAT;\\ global value
     public void onCreate(Bundle savedInstanceState)
            {      
        disp(); // calling the function disp to set the value to BAT                
        String To_string=Double.toString(BAT);    
            System.out.println("Current Battery level  ==="+To_string); \\ prints 0.0 the wrong value
        super.onCreate(savedInstanceState);
            setContentView(R.layout.main); 
           }


     public void disp(){            
        this.registerReceiver(this.batteryInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));               
        }



        private BroadcastReceiver batteryInfoReceiver = new BroadcastReceiver(){                
        public void onReceive(Context context, Intent intent){                  
        double  level= intent.getIntExtra(BatteryManager.EXTRA_LEVEL,0);
        BAT=level;
            Textview1 = (EditText) findViewById(R.id.Textview1);
            Textview1.setText(Double.toString(BAT));      // sets the correct value
            System.out.println("bbbattererrerey 1 "+Double.toString(BAT));   //prints the correct value
        }        
    };
}

Answer 1

只需在类中将变量全局初始化为 public static 即可。您将能够从任何地方访问它。