Android Open Source - AndroidHttpTutorial Simple Task

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License

The source code is released under:

Apache License

Java Source Code

package com.yanlu.android.learn.imageloadtutorial.app.async;
/*from  w w  w .j  a v  a  2s.c o m*/
import android.os.AsyncTask;
import android.os.Build;
import android.util.Log;

import java.util.concurrent.RejectedExecutionException;

public abstract class SimpleTask<T> extends AsyncTask<Integer, Long, T> {
    private static final String TAG = "AsyncTask2<T>";
    protected Exception mException = null;

    /**
     * ?task??????: ?UI Thread???
     */
    protected void onTaskBefore() {}

    /**
     * task??: ?work Thread???
     */
    protected abstract T onTask() throws Exception;

    /**
     * task?????????UI Thread???
     */
    protected abstract void onTaskAfter(T t) throws Exception;

    /**
     * onTask()???????.
     */
    public void publishProgressPublic(Long... values) {
        publishProgress(values);
    }

    /**
     * ??????...
     */
    protected void onHandleAkException(Exception e) {
        Log.w(TAG, e.toString());

    }




    @Override
    protected void onPreExecute() {
        onTaskBefore();
    }

    private AsyncTask<Integer, Long, T> startOnSerial() {
        //???? ??RejectedExecutionException
        try {
            return execute(0);
        } catch (RejectedExecutionException e) {
            return null;
        }
    }

    public AsyncTask<Integer, Long, T> start() {
        //??RejectedExecutionException
        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                return executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, 0);
            } else {
                return execute(0);
            }
        } catch (RejectedExecutionException e) {
            return null;
        }
    }


    @Override
    protected T doInBackground(Integer... integers) {
        try {
            if (mException == null) {
                return onTask();
            } else {
                return null;
            }
        } catch (Exception e) {
            mException = e;
            return null;
        }
    }


    @Override
    protected void onPostExecute(T t) {

        if (mException != null) {
            onHandleAkException(mException);
        } else {
            try {
                onTaskAfter(t);
            } catch (Exception akException) {
                onHandleAkException(mException);
            }
        }
    }

}

Java Source Code List

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