Android涔婬andler涓嶢syncTask鐨勫尯鍒?杞

Android涓轰簡闄嶄綆杩欎釜寮?鍙戦毦搴︼紝鎻愪緵浜咥syncTask銆侫syncTask灏辨槸涓?涓?皝瑁呰繃鐨勫悗鍙颁换鍔＄被锛岄【鍚嶆?濅箟灏辨槸寮傛?浠诲姟銆?/p>

AsyncTask鐩存帴缁ф壙浜嶰bject绫伙紝浣嶇疆涓篴ndroid.os.AsyncTask銆傝?浣跨敤AsyncTask宸ヤ綔鎴戜滑瑕佹彁渚涗笁涓?硾鍨嬪弬鏁帮紝骞堕噸杞藉嚑涓?柟娉?鑷冲皯閲嶈浇涓?涓?銆?/p>

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AsyncTask瀹氫箟浜嗕笁绉嶆硾鍨嬬被鍨?Params锛孭rogress鍜孯esult銆?/p>

浣跨敤杩嘇syncTask 鐨勫悓瀛﹂兘鐭ラ亾涓?涓?紓姝ュ姞杞芥暟鎹?渶灏戣?閲嶅啓浠ヤ笅杩欎袱涓?柟娉曪細

• doInBackground(Params鈥? 鍚庡彴鎵ц?锛屾瘮杈冭?楁椂鐨勬搷浣滈兘鍙?互鏀惧湪杩欓噷銆傛敞鎰忚繖閲屼笉鑳界洿鎺ユ搷浣淯I銆傛?鏂规硶鍦ㄥ悗鍙扮嚎绋嬫墽琛岋紝瀹屾垚浠诲姟鐨勪富瑕佸伐浣滐紝閫氬父闇?瑕佽緝闀跨殑鏃堕棿銆傚湪鎵ц?杩囩▼涓?彲浠ヨ皟鐢╬ublicProgress(Progress鈥?鏉ユ洿鏂颁换鍔＄殑杩涘害銆?/li>
• onPostExecute(Result)聽 鐩稿綋浜嶩andler 澶勭悊UI鐨勬柟寮忥紝鍦ㄨ繖閲岄潰鍙?互浣跨敤鍦╠oInBackground 寰楀埌鐨勭粨鏋滃?鐞嗘搷浣淯I銆?姝ゆ柟娉曞湪涓荤嚎绋嬫墽琛岋紝浠诲姟鎵ц?鐨勭粨鏋滀綔涓烘?鏂规硶鐨勫弬鏁拌繑鍥?/li>

鏈夊繀瑕佺殑璇濅綘杩樺緱閲嶅啓浠ヤ笅杩欎笁涓?柟娉曪紝浣嗕笉鏄?繀椤荤殑锛?/p>

• onProgressUpdate(Progress鈥?聽聽 鍙?互浣跨敤杩涘害鏉″?鍔犵敤鎴蜂綋楠屽害銆?姝ゆ柟娉曞湪涓荤嚎绋嬫墽琛岋紝鐢ㄤ簬鏄剧ず浠诲姟鎵ц?鐨勮繘搴︺??/li>
• onPreExecute()聽聽聽聽聽聽聽 杩欓噷鏄?渶缁堢敤鎴疯皟鐢‥xcute鏃剁殑鎺ュ彛锛屽綋浠诲姟鎵ц?涔嬪墠寮?濮嬭皟鐢ㄦ?鏂规硶锛屽彲浠ュ湪杩欓噷鏄剧ず杩涘害瀵硅瘽妗嗐??/li>
• onCancelled()聽聽聽聽聽聽聽聽聽聽聽聽 鐢ㄦ埛璋冪敤鍙栨秷鏃讹紝瑕佸仛鐨勬搷浣?/li>

浣跨敤AsyncTask绫伙紝浠ヤ笅鏄?嚑鏉″繀椤婚伒瀹堢殑鍑嗗垯锛?/p>

• Task鐨勫疄渚嬪繀椤诲湪UI thread涓?垱寤猴紱
• execute鏂规硶蹇呴』鍦║I thread涓?皟鐢?紱
• 涓嶈?鎵嬪姩鐨勮皟鐢╫nPreExecute(), onPostExecute(Result)锛宒oInBackground(Params...), onProgressUpdate(Progress...)杩欏嚑涓?柟娉曪紱
• 璇?ask鍙?兘琚?墽琛屼竴娆★紝鍚﹀垯澶氭?璋冪敤鏃跺皢浼氬嚭鐜板紓甯革紱

涓?涓?秴绠?鍗曠殑鐞嗚В AsyncTask 鐨勪緥瀛愶細

import android.os.AsyncTask;聽聽聽聽
import android.widget.ProgressBar;聽聽聽聽
import android.widget.TextView;聽聽聽聽
聽聽聽聽
/**聽聽聽
聽* 鐢熸垚璇ョ被鐨勫?璞★紝骞惰皟鐢╡xecute鏂规硶涔嬪悗聽聽聽
聽* 棣栧厛鎵ц?鐨勬槸onProExecute鏂规硶聽聽聽
聽* 鍏舵?鎵ц?doInBackgroup鏂规硶聽聽聽
聽*聽聽聽
聽*/聽聽聽聽
public class ProgressBarAsyncTask extends AsyncTask<Integer, Integer, String> {聽聽聽聽
聽聽聽聽
聽聽聽 private TextView textView;聽聽聽聽
聽聽聽 private ProgressBar progressBar;聽聽聽聽
聽聽聽聽聽聽聽聽
聽聽聽聽聽聽聽聽
聽聽聽 public ProgressBarAsyncTask(TextView textView, ProgressBar progressBar) {聽聽聽聽
聽聽聽聽聽聽聽 super();聽聽聽聽
聽聽聽聽聽聽聽 this.textView = textView;聽聽聽聽
聽聽聽聽聽聽聽 this.progressBar = progressBar;聽聽聽聽
聽聽聽 }聽聽聽聽
聽聽聽聽
聽聽聽聽
聽聽聽 /**聽聽聽
聽聽聽聽 * 杩欓噷鐨処nteger鍙傛暟瀵瑰簲AsyncTask涓?殑绗?竴涓?弬鏁奥犅犅犅?
聽聽聽聽 * 杩欓噷鐨凷tring杩斿洖鍊煎?搴擜syncTask鐨勭?涓変釜鍙傛暟聽聽聽
聽聽聽聽 * 璇ユ柟娉曞苟涓嶈繍琛屽湪UI绾跨▼褰撲腑锛屼富瑕佺敤浜庡紓姝ユ搷浣滐紝鎵?鏈夊湪璇ユ柟娉曚腑涓嶈兘瀵筓I褰撲腑鐨勭┖闂磋繘琛岃?缃?拰淇?敼聽聽聽
聽聽聽聽 * 浣嗘槸鍙?互璋冪敤publishProgress鏂规硶瑙﹀彂onProgressUpdate瀵筓I杩涜?鎿嶄綔聽聽聽
聽聽聽聽 */聽聽聽聽
聽聽聽 @Override聽聽聽聽
聽聽聽 protected String doInBackground(Integer... params) {聽聽聽聽聽
聽聽聽聽聽聽聽聽聽聽聽聽 int i = 0;聽聽聽聽
聽聽聽聽聽聽聽 for (i = 10; i <= 100; i+=10) {聽聽聽聽聽
聽聽聽聽聽聽聽聽聽聽聽 //聽Thread.sleep(1000);

聽聽聽聽聽聽聽聽聽聽聽 publishProgress(i);聽聽聽聽
聽聽聽聽聽聽聽 }聽聽聽聽
聽聽聽聽聽聽聽 return i + params[0].intValue() + "";聽聽聽聽
聽聽聽 }聽聽聽聽聽
聽聽聽聽聽
聽聽聽 /**聽聽聽
聽聽聽聽 * 杩欓噷鐨凷tring鍙傛暟瀵瑰簲AsyncTask涓?殑绗?笁涓?弬鏁帮紙涔熷氨鏄?帴鏀禿oInBackground鐨勮繑鍥炲?硷級聽聽聽
聽聽聽聽 * 鍦╠oInBackground鏂规硶鎵ц?缁撴潫涔嬪悗鍦ㄨ繍琛岋紝骞朵笖杩愯?鍦║I绾跨▼褰撲腑 鍙?互瀵筓I绌洪棿杩涜?璁剧疆聽聽聽
聽聽聽聽 */聽聽聽聽
聽聽聽 @Override聽聽聽聽
聽聽聽 protected void onPostExecute(String result) {聽聽聽聽
聽聽聽聽聽聽聽 textView.setText("寮傛?鎿嶄綔鎵ц?缁撴潫" + result);聽聽聽聽
聽聽聽 }聽聽聽聽聽
聽聽聽聽聽聽 //璇ユ柟娉曡繍琛屽湪UI绾跨▼褰撲腑,骞朵笖杩愯?鍦║I绾跨▼褰撲腑 鍙?互瀵筓I绌洪棿杩涜?璁剧疆聽聽聽聽
聽聽聽 @Override聽聽聽聽
聽聽聽 protected void onPreExecute() {聽聽聽聽
聽聽聽聽聽聽聽 textView.setText("寮?濮嬫墽琛屽紓姝ョ嚎绋?);聽聽聽聽
聽聽聽 }聽聽聽聽聽
聽聽聽聽聽聽聽聽聽聽
聽聽聽 /**聽聽聽
聽聽聽聽 * 杩欓噷鐨処ntege鍙傛暟瀵瑰簲AsyncTask涓?殑绗?簩涓?弬鏁奥犅犅?
聽聽聽聽 * 鍦╠oInBackground鏂规硶褰撲腑锛岋紝姣忔?璋冪敤publishProgress鏂规硶閮戒細瑙﹀彂onProgressUpdate鎵ц?聽聽聽
聽聽聽聽 * onProgressUpdate鏄?湪UI绾跨▼涓?墽琛岋紝鎵?鏈夊彲浠ュ?UI绌洪棿杩涜?鎿嶄綔聽聽聽
聽聽聽聽 */聽聽聽聽
聽聽聽 @Override聽聽聽聽
聽聽聽 protected void onProgressUpdate(Integer... values) {聽聽聽聽
聽聽聽聽聽聽聽 int vlaue = values[0];聽聽聽聽
聽聽聽聽聽聽聽 progressBar.setProgress(vlaue);聽聽聽聽
聽聽聽 }聽聽聽聽
}