创建一个广播机制！

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.provider.Browser.BookmarkColumns;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
    Myboardcast mMyboardcast;
    protected String action = "发送内容";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.btn);
        mMyboardcast = new Myboardcast();//创建广播
        IntentFilter filter = new IntentFilter();
        filter.addAction(action);//过滤器
        registerReceiver(mMyboardcast, filter);
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction(action);
                MainActivity.this.sendBroadcast(intent);//发送意图
            }
        });
    }

    @Override
    protected void onDestroy() {
        unregisterReceiver(mMyboardcast);
        super.onDestroy();
    }

    private class Myboardcast extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            Log.e("Myboardcast", "收到广播！");
        }

    }
}