tabhost的各個tab頁，都是由activity組成。
現在，某個子activity中處理資料後，要自動跳轉到另外一個tab頁中。這樣，需要有個tabhost頁和子activity之間的通訊的機制。
子activity通知tabhost：
1、通過廣播方式
1）在tabhost中定義廣播
定義變量
protected messagebroadcastreceiver myreceiver = null;
在oncreate中注冊：
加入receivebroadcast();
private void receivebroadcast() {
myreceiver = new messagebroadcastreceiver();
//log.d(log_tag, "receivebroadcast() ::::: " + myreceiver.hashcode());
intentfilter intentfilter = new intentfilter("android.intent.action.main");
registerreceiver(myreceiver, intentfilter);
}
在ondestroy中釋放廣播
if (myreceiver != null)
unregisterreceiver(myreceiver);
messagebroadcastreceiver類定義:
public class messagebroadcastreceiver extends broadcastreceiver {
@override
public void onreceive(context context, intent intent) {
try {
string action = intent.getaction();
if (action.equals("android.intent.action.main")) {
switch (intent.getintextra("msg", 0)) {
case constant.broadcast_key_tabhost_change: {
int tabindex = intent.getintextra("tabindex", 0);
animatechangetab(tabindex);
} catch (exception e) {
e.printstacktrace();
log.v(log_tag, e.getmessage());
2）在子activity中調用
intent intent = new intent("android.intent.action.main");
intent.putextra("msg", constant.broadcast_key_tabhost_change);
intent.putextra("tabindex", 0);
sendbroadcast(intent);
2、通過handler接收消息
1）在tabhost中定義handler
// 得到主線程的looper對象
looper looper = looper.mylooper();
// 這個myhandler由主線程建立是以它與主線程關聯
public messagehandler msghandler = new messagehandler(looper);
private void showmessage(string message) {
// 發送本次資訊
msghandler.removemessages(0);
message m = msghandler.obtainmessage(1, 1, 1, message); // 構造要傳遞的消息
msghandler.sendmessage(m); // 發送消息: 系統會自動調用handlemessage 方法來處理消息
public class messagehandler extends handler {
public messagehandler(looper looper) {
super(looper);
}
public void handlemessage(message msg) { // 處理消息
switch (msg.what) {
case constant.broadcast_key_tabhost_change:
int tabindex = (integer) msg.obj;
break;
default:
toast.maketext(getapplicationcontext(), msg.obj.tostring(),
toast.length_short).show();
basketballmainactivity t= (basketballmainactivity) getparent();
message message = new message();
message.what = constant.broadcast_key_tabhost_change;
message.obj = 0;
t.msghandler.sendmessage(message);
tabhost通知子activity：
1、子activity是活動的
在tabhost中增加
activity currentactivity = getcurrentactivity();
if (currentactivity instanceof a) {
((a) currentactivity).處理方法xxx;
}
2、子activity是不是活動的
在子activity的
protected void onresume() {
//添加邏輯即可
}