发送有关使用共享preferences [机器人]广播和活动之间的计费数据

问题描述

我用广播接收器发送关于电池的充电状态我的主要活动的信息。应用程序使用共享preferences 发送数据。

I'm using BroadcastReceiver to send information about status of battery charging to my Main Activity. App uses SharedPreferences to send data.

在我的手机连接或断开充电的问题。这款应用程序崩溃。我觉得这是问题，共享preferences 。我对吗？而我应该做的工作中取得好？

The problem is when my phone is connected or disconnected to charge. The app is crashed. I think this is problem with SharedPreferences. Am i right? And what i should do to get in working well?

这是我的广播接收器类：

public class PowerConnectionReceiver extends BroadcastReceiver {

        SharedPreferences pref;

        public void onReceive(Context context, Intent intent) { 


            SharedPreferences.Editor prefEditor = pref.edit();

                int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);         
                boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                        status == BatteryManager.BATTERY_STATUS_FULL;

                prefEditor.putBoolean("isCharging", false).commit();

                int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);

                boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
                boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;

        }
}

这是主要活动：

SharedPreferences pref;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        pref = getSharedPreferences("StatusOfCharging", Activity.MODE_PRIVATE);
        Boolean isCharging = pref.getBoolean("isCharging", false);
        if (isCharging == true){
            Toast.makeText(this, "work", Toast.LENGTH_LONG).show();
        }else
            Toast.makeText(this, "Don't work", Toast.LENGTH_LONG).show();
    }

谢谢您的回答

推荐答案

初始化 preF 像

pref = context.getSharedPreferences("StatusOfCharging",context.MODE_‌​PRIVATE);

在广播接收器在的onReceive（） ..

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