handler，registerReceiver以及activty跟BroadcastReceiver的传值

public class Container extends TabActivity{	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		host = getTabHost();		Intent intent = new Intent(this, Tab1Activity.class);		host.addTab(host.newTabSpec("one").setIndicator("TAB1").setContent(intent));		intent = new Intent(this, Tab2Activity.class);		host.addTab(host.newTabSpec("two").setIndicator("TAB2").setContent(intent));	}		@Override	protected void onResume() {		super.onResume();		receiver = new TabChangeReceiver();		registerReceiver(receiver, new IntentFilter("com.novoda.TAB"), null, mHandler);	}		@Override	protected void onPause() {		super.onPause();		unregisterReceiver(receiver);	};	    protected Handler mHandler = new Handler() {        @Override public void handleMessage(Message msg) {            switch (msg.what) {            	case SWITCH_TAB:            		Log.i("handler", "using the handler");                    host.setCurrentTab(msg.arg1);            		            		break;            }        }    };    public class TabChangeReceiver extends android.content.BroadcastReceiver{		@Override		public void onReceive(Context context, Intent intent) {			int intExtra = intent.getIntExtra("tab", 0);			Log.i(TabChangeReceiver.class.getSimpleName(), "Recieved broadcast with extra=[" + intExtra + "]");						mHandler.sendMessage(mHandler.obtainMessage(SWITCH_TAB, intExtra, 0));		}	}		private TabHost host;	public static final int SWITCH_TAB = 2545;	protected static TabChangeReceiver receiver;	}

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public class Tab1Activity extends Activity{		@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);        setContentView(R.layout.tab1);        findViewById(R.id.tab1button).setOnClickListener(new OnClickListener() {			public void onClick(View v) {				Intent intent = new Intent("com.novoda.TAB");				intent.putExtra("tab", 1);				sendBroadcast(intent);			}		});	}}

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public class Tab2Activity extends Activity{		@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);        setContentView(R.layout.tab2);        findViewById(R.id.tab2button).setOnClickListener(new OnClickListener() {			public void onClick(View v) {				Intent intent = new Intent("com.novoda.TAB");				intent.putExtra("tab", 0);				sendBroadcast(intent);			}		});        	}}

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这个传值是通过setbroadcast监听实现的，这个主要用来监听 同一个类型的activityIntent intent = new Intent("com.novoda.TAB");
比较好，这里呢也使用handler处理监听到的消息