用Broadcast Receiver刷新数据

①注册广播事件：

注册方式有两种，

一种是静态注册，就是在AndroidManifest.xml文件中定义，注册的广播接收器必须要继承BroadcastReceiver；

另一种是动态注册，是在程序中使用Context.registerReceiver注册，注册的广播接收器相当于一个匿名类。两种方式都需要IntentFIlter。
②发送广播事件：通过Context.sendBroadcast来发送，由Intent来传递注册时用到的Action。
③接收广播事件：当发送的广播被接收器监听到后，会调用它的onReceive()方法，并将包含消息的Intent对象传给它。onReceive中代码的执行时间不要超过5s，否则Android会弹出超时dialog。

Intent intent = new Intent();

Intent intent = new Intent();
intent.setAction("SENDRECEIVE");
sendBroadcast(intent);//有序广播
//sendOrderedBroadcast(intent,null,new MyReceiver(),null,"发送的内容");无序广播

IntentFilter filter_system = new IntentFilter();

filter_system.addAction(SYSTEMACTION);
registerReceiver(systemReceiver, filter_system);
}
private BroadcastReceiver dynamicReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.e("MainActivity", "接收自定义动态注册广播消息");
if(intent.getAction().equals(DYNAMICACTION)){
String msg = intent.getStringExtra("msg");
Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
}
}
};
private BroadcastReceiver systemReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.e("MainActivity", "接收系统动态注册广播消息");
if(intent.getAction().equals(SYSTEMACTION)){
String msg = intent.getStringExtra("msg");
Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
}
}
};
}

//发送广播刷新用户数据
Intent intent = new Intent();
intent.setAction(MyFragment.FILTER_CODE);
sendBroadcast(intent);
mContext.sendBroadcast(new Intent().setAction("home"));//发送广播刷新首页商品

//注册广播
IntentFilter filter = new IntentFilter("home");
mContext.registerReceiver(new MyReceiver(), filter);

class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        //位置信息
        tvLocation.setText("");
        loadingDialog.show();
        //启动定位
        mLocationClient.startLocation();
    }
}