如何在一个BroadcastReceiver更新UI [英] How to update UI in a BroadcastReceiver

问题描述

我创造的，我注册的广播接收器在我的主类的应用程序（主要活动），每当我收到东西在我的的BroadcastReceiver 我想更新用户界面，例如我想显示一个警告框，或设置一些文本视图我的 MainActivity 。我收到我的接收器所有的值，但无法对其进行设置，可以有人帮助我，让我可以更新我的UI中的的BroadcastReceiver 。

I created an application in which I registered a broadcast receiver within my main class(Main Activity) and whenever I receive something in my BroadcastReceiver I want to update UI for e.g. I want to show an alert box or set some text view of my MainActivity. I receive all the values in my receiver but unable to set them, can somebody help me so that I can update my UI in the BroadcastReceiver.

我的BroadcastReceiver类是内部类MainActivity像这样的： -

My BroadcastReceiver class is inner class of MainActivity like this :-

public class MainActivity extends Activity {

   ..........

public static class NissanTabBroadcast extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            SharedPreferences shrd = context.getSharedPreferences("NissanGallery", context.MODE_WORLD_READABLE);
            type = shrd.getString("type", "null");
            badges = shrd.getString("badge_count", "null");

            //badge_tips_text.setText(badges);
            /*Editor edit =  shrd.edit();
            edit.remove("type");*/

            Toast.makeText(context, "" + type + "\n" + badge_tips_text.getText().toString(), Toast.LENGTH_LONG).show();
        }
    }
}

任何帮助将AP preciable

Any help will be appreciable

感谢

推荐答案

我建议你使用一个处理器。

I suggest you use a Handler.

1. 在初始化处理程序中的活动，例如：处理程序=新的处理程序（）
2. 提供处理程序的的BroadcastReceiver在构造函数中，以同样的方式，像我一样的NissanTabBroadcast上述
在的onReceive（）方法的处理程序实例
3. 使用后（）方法提交了Runnable的更新用户界面

1. Initialize a Handler in the Activity, example: handler = new Handler()
2. Provide the handler to the BroadcastReceiver in the constructor, in the same way as I did for NissanTabBroadcast above
3. Use post() method of your Handler instance in the onReceive() method to submit the Runnable that updates the UI

这是我能想象最干净的解决方案。

This is the cleanest solution I can imagine.

public class MainActivity extends Activity {

    private MyReceiver receiver;

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

        receiver = new MyReceiver(new Handler()); // Create the receiver
        registerReceiver(receiver, new IntentFilter("some.action")); // Register receiver

        sendBroadcast(new Intent("some.action")); // Send an example Intent
    }

    public static class MyReceiver extends BroadcastReceiver {

        private final Handler handler; // Handler used to execute code on the UI thread

        public MyReceiver(Handler handler) {
            this.handler = handler;
        }

        @Override
        public void onReceive(final Context context, Intent intent) {
            // Post the UI updating code to our Handler
            handler.post(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(context, "Toast from broadcast receiver", Toast.LENGTH_SHORT).show();
                }
            });
        }
    }
}

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