android异步任务api有哪些替代方案？

lnxxn5zx 于 2021-09-13 发布在 Java

关注(0)|答案(16)|浏览(673)

谷歌反对android 11中的android asynctask api，并建议使用 java.util.concurrent 相反你可以在这里查看提交


* 

 * @deprecated Use the standard <code>java.util.concurrent</code> or
 *   <a href="https://developer.android.com/topic/libraries/architecture/coroutines">
 *   Kotlin concurrency utilities</a> instead.
 */
@Deprecated
public abstract class AsyncTask<Params, Progress, Result> {

如果您在android中使用异步任务维护一个较旧的代码库，那么将来可能需要对其进行更改。我的问题是，应该使用什么来正确替换下面显示的代码段 java.util.concurrent . 它是活动的静态内部类。我正在寻找一些可以与之合作的东西 minSdkVersion 16 ```
private static class LongRunningTask extends AsyncTask<String, Void, MyPojo> {
private static final String TAG = MyActivity.LongRunningTask.class.getSimpleName();
private WeakReference activityReference;

    LongRunningTask(MyActivity context) {
        activityReference = new WeakReference<>(context);
    }

    @Override
    protected MyPojo doInBackground(String... params) {
        // Some long running task

    }

    @Override
    protected void onPostExecute(MyPojo data) {

        MyActivity activity = activityReference.get();
        activity.progressBar.setVisibility(View.GONE);
        populateData(activity, data) ;
    }     

}

Java kotlin android kotlin-coroutines

来源：https://stackoverflow.com/questions/68529683/alternative-to-asynctask-since-it-is-deprecated

16条答案

按热度按时间

bhmjp9jg16#

公认的答案是好的。但是我没有看到cancel（）方法的实现
因此，我可以取消正在运行的任务（模拟取消）的实现如下。在任务中断的情况下，需要取消才能不运行postexecute（）方法。

public abstract class AsyncTaskExecutor<Params> {
    public static final String TAG = "AsyncTaskRunner";

    private static final Executor THREAD_POOL_EXECUTOR =
            new ThreadPoolExecutor(5, 128, 1,
                    TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());

    private final Handler mHandler = new Handler(Looper.getMainLooper());
    private boolean mIsInterrupted = false;

    protected void onPreExecute(){}
    protected abstract Void doInBackground(Params... params);
    protected void onPostExecute(){}
    protected void onCancelled() {}

    @SafeVarargs
    public final void executeAsync(Params... params) {
        THREAD_POOL_EXECUTOR.execute(() -> {
            try {
                checkInterrupted();
                mHandler.post(this::onPreExecute);

                checkInterrupted();
                doInBackground(params);

                checkInterrupted();
                mHandler.post(this::onPostExecute);
            } catch (InterruptedException ex) {
                mHandler.post(this::onCancelled);
            } catch (Exception ex) {
                Log.e(TAG, "executeAsync: " + ex.getMessage() + "\n" + Debug.getStackTrace(ex));
            }
        });
    }

    private void checkInterrupted() throws InterruptedException {
        if (isInterrupted()){
            throw new InterruptedException();
        }
    }

    public void cancel(boolean mayInterruptIfRunning){
        setInterrupted(mayInterruptIfRunning);
    }

    public boolean isInterrupted() {
        return mIsInterrupted;
    }

    public void setInterrupted(boolean interrupted) {
        mIsInterrupted = interrupted;
    }
}

使用此类的示例：

public class MySearchTask extends AsyncTaskExecutor<String> {

    public MySearchTask(){
    }

    @Override
    protected Void doInBackground(String... params) {
        // Your long running task
        return null;
    }

    @Override
    protected void onPostExecute() {
        // update UI on task completed
    }

    @Override
    protected void onCancelled() {
        // update UI on task cancelled
    }
}

MySearchTask searchTask = new MySearchTask();
searchTask.executeAsync("Test");

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android异步任务api有哪些替代方案？

16条答案

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