广播发送系统情况如当前电量等_1、开发一个程序用sf+学号为项目名称创建一个android应用程序项目如:包同学学

先注册

mySystemReceiver = new MySystemReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(Intent.ACTION_BATTERY_LOW);
intentFilter.addAction(Intent.ACTION_BATTERY_OKAY);
intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
intentFilter.addAction(Intent.ACTION_SCREEN_ON);
intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
registerReceiver(mySystemReceiver,intentFilter);
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在广播接收者中判断

public class MySystemReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if(intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)){
            int level = intent.getIntExtra("level", 0);
            Toast.makeText(context, "当前电量"+level, Toast.LENGTH_SHORT).show();
        }else if(intent.getAction().equals(Intent.ACTION_BATTERY_LOW)){
            Toast.makeText(context, "电量低", Toast.LENGTH_SHORT).show();
        }else if(intent.getAction().equals(Intent.ACTION_BATTERY_OKAY)){
            Toast.makeText(context, "电量充足", Toast.LENGTH_SHORT).show();
        }else if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)){
            Toast.makeText(context, "屏幕亮了", Toast.LENGTH_SHORT).show();
        }else if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)){
            Toast.makeText(context, "屏幕锁了", Toast.LENGTH_SHORT).show();
        }
    }
}
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