1.簡單的異步操作:
new Thread(new Runnable() {//開啓一個新線程(執行耗時操作)
@Override
public void run() {
// TODO Auto-generated method stub
Message message = new Message();
message.what = UPDATE_TEXT;
handler.sendMessage(message);
}
}).start();
private Handler handler = new Handler(){//:與其他線程協同工作,接收其他線程的消息並通過接收到的消息更新主UI線程的內容
@Override
public void handleMessage(Message msg){
switch(msg.what){
case UPDATE_TEXT:
text.setText("Nice to meet you");
break;
default:
break;
}
}
};
2.輪詢:爲了實現數據實時跟新//加載對話頁面數據
loadData(false);
//開始輪詢獲取對話和粉絲數,每隔一秒重新加載一次
handler.postDelayed(loopGetTalk,1000);
Runnable loopGetTalk=new Runnable() {
@Override
public void run() {
loadData(false);
handler.postDelayed(new Runnable() {//異步查詢,避免數據重複
@Override
public void run() {
getUnReadFans();
}
}, 200);
handler.postDelayed(this,1000);
}
};
3.AsyncTask與handler的聯合使用
if (VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB) {
task.executeOnExecutor(Executors.newCachedThreadPool(),args);
}else {
task.execute(args);}
AsyncTask<Object, Integer, Object> task =new AsyncTask<Object, Integer, Object>() {
@Override
protected Object doInBackground(Object... arg0) {//相當於一個Thread(線程)(執行耗時操作)
return result;
}
@Override
protected void onPostExecute(Object result) {//處理在線程中處理完的結果
super.onPostExecute(result);
hd.sendMessage(hd.obtainMessage(taskType, result));
}
};