Android程序设计：一个用于同步远程数据库数据异步类AsyncTask

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一个用于同步远程数据库数据异步类AsyncTask

此类省略某些业务代码：

package com.abc.splashdemo;//import ...;import android.os.AsyncTask;public class SyncCaseAsyncTask extends AsyncTask<String, Integer, String> {    public interface onSyncCompleted {        public void SyncCompleted();    }    private List<Case>  listCases   = new ArrayList<Case>();    private onSyncCompleted mOnSyncCompleted    = null;    public SyncCaseAsyncTask() {    }    public void addCase(String strCaseGUID) {        //..    }    public void addCase(Case cs) {        //..    }    public void clear() {        listCases.clear();    }    public void setOnSyncCompleted(onSyncCompleted onSyncCompletedEventHandler) {        mOnSyncCompleted = onSyncCompletedEventHandler;    }    private boolean checkIsExist(String strCaseGUID) {        boolean rtn = false;        //..        return rtn;    }    @Override    protected void onPreExecute() {        super.onPreExecute();        //..    }    @Override    protected String doInBackground(String... params) {        if (listCases.size() > 0) {            //..            updateCase2Server(cs);            //..            return "同步完畢";        } else {            return "沒有參數";        }    }    private void updateCase2Server(Case cs) {        //..    }    @Override    protected void onPostExecute(String result) {        super.onPostExecute(result);        if (mOnSyncCompleted != null) {            mOnSyncCompleted.SyncCompleted();        }    }    @Override    protected void onCancelled() {        super.onCancelled();    }}

UI Activity的调用方法：

//--初始化--private SyncCaseAsyncTask   caseSyncTask    = new SyncCaseAsyncTask();//--增加事件处理--    caseSyncTask.setOnSyncCompleted(new onSyncCompleted() {        @Override        public void SyncCompleted() {            showMsg("--完成同步哦--");            caseSyncTask.clear();        }    });//--调用--    if (caseSyncTask != null) {        caseSyncTask.addCase(new Case);        caseSyncTask.execute();    }

另外一个调用方法：可以多次调用，不过要等待异步执行完毕后，才从新手动执行，否则需要加一个
stopAyncTaskRunning(); 取消或者停止异步。

if (caseSyncTask == null) {    caseSyncTask = new SyncCaseAsyncTask();    caseSyncTask.addCase(mDatas.get(mPosition));    caseSyncTask.setOnSyncCompleted(SyncCompletedEventHandler);    caseSyncTask.execute();}SyncCompletedEventHandler = new onSyncCompleted() {    @Override    public void SyncCompleted() {        showMsg("--完成同步哦--");        caseSyncTask.clear();        caseSyncTask = null;    }};private void stopAyncTaskRunning() {     if (caseSyncTask != null && caseSyncTask .getStatus() == AsyncTask.Status.RUNNING) {          caseSyncTask .cancel(true);        //if task is still running, stop it;      }}

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