AsyncTask Android示例

我正在阅读有关AsyncTask的文章，并尝试了下面的简单程序。但这似乎并不奏效。我该怎么做呢?

public class AsyncTaskActivity extends Activity {

    Button btn;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btn = (Button) findViewById(R.id.button1);
        btn.setOnClickListener((OnClickListener) this);
    }

    public void onClick(View view){
        new LongOperation().execute("");
    }

    private class LongOperation extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... params) {
            for(int i=0;i<5;i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            TextView txt = (TextView) findViewById(R.id.output);
            txt.setText("Executed");
            return null;
        }

        @Override
        protected void onPostExecute(String result) {
        }

        @Override
        protected void onPreExecute() {
        }

        @Override
        protected void onProgressUpdate(Void... values) {
        }
    }
}

我只是试图在后台进程中5秒后更改标签。

这是我的main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:orientation="vertical" >
    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:indeterminate="false"
        android:max="10"
        android:padding="10dip">
    </ProgressBar>
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Start Progress" >
    </Button>
    <TextView android:id="@+id/output"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Replace"/>
</LinearLayout>

当前回答

如何记住AsyncTask中使用的参数?

不

如果你是AsyncTask的新手，那么在编写AsyncTask时很容易感到困惑。主要原因是AsyncTask中使用的参数，即AsyncTask<A, B, C>。基于方法的A, B, C(参数)签名的不同，这使得事情更加混乱。

保持简单!

关键是不要死记硬背。如果你可以想象你的任务真正需要做什么，那么在第一次尝试时用正确的签名编写AsyncTask将是小菜一碟。只要弄清楚你的输入、进度和输出是什么，你就可以开始了。

什么是AsyncTask?

AsyncTask是一个运行在后台线程的后台任务。它接受一个Input，执行Progress并给出一个Output。

例如，AsyncTask<Input, Progress, Output>。

例如:

与方法的关系是什么?

在AsyncTask和doInBackground()之间

doInBackground()和onPostExecute()，onProgressUpdate() '也是相关的

怎么写在代码里?

DownloadTask extends AsyncTask<String, Integer, String>{

    // Always same signature
    @Override
    public void onPreExecute()
    {}

    @Override
    public String doInbackGround(String... parameters)
    {
        // Download code
        int downloadPerc = // Calculate that
        publish(downloadPerc);

        return "Download Success";
    }

    @Override
    public void onPostExecute(String result)
    {
        super.onPostExecute(result);
    }

    @Override
    public void onProgressUpdate(Integer... parameters)
    {
        // Show in spinner, and access UI elements
    }

}

您将如何运行此任务?

new DownLoadTask().execute("Paradise.mp3");

2019-01-25 06:20:01

其他回答

当一个异步任务执行时，该任务经过四个步骤:

onPreExecute () doInBackground (Params…) onProgressUpdate(进步…) onPostExecute(结果)

下面是一个演示示例:

private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> {

    protected Long doInBackground(URL... urls) {
        int count = urls.length;
        long totalSize = 0;
        for (int i = 0; i < count; i++) {
            totalSize += Downloader.downloadFile(urls[i]);
            publishProgress((int) ((i / (float) count) * 100));

            // Escape early if cancel() is called
            if (isCancelled())
                break;
        }
        return totalSize;
    }

    protected void onProgressUpdate(Integer... progress) {
        setProgressPercent(progress[0]);
    }

    protected void onPostExecute(Long result) {
        showDialog("Downloaded " + result + " bytes");
    }
 }

一旦你创建了一个任务，执行起来非常简单:

new DownloadFilesTask().execute(url1, url2, url3);

2014-01-23 11:20:21

带进度的AsyncTask示例示例

import android.animation.ObjectAnimator;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.LinearInterpolator;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class AsyncTaskActivity extends AppCompatActivity implements View.OnClickListener {

    Button btn;
    ProgressBar progressBar;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.button1);
        btn.setOnClickListener(this);
        progressBar = (ProgressBar)findViewById(R.id.pbar);
    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.button1:
                new LongOperation().execute("");
                break;
        }
    }

    private class LongOperation extends AsyncTask<String, Integer, String> {

        @Override
        protected String doInBackground(String... params) {
            Log.d("AsyncTask", "doInBackground");
            for (int i = 0; i < 5; i++) {
                try {
                    Log.d("AsyncTask", "task "+(i + 1));
                    publishProgress(i + 1);
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    Thread.interrupted();
                }
            }
            return "Completed";
        }

        @Override
        protected void onPostExecute(String result) {
            Log.d("AsyncTask", "onPostExecute");
            TextView txt = (TextView) findViewById(R.id.output);
            txt.setText(result);
            progressBar.setProgress(0);
        }

        @Override
        protected void onPreExecute() {
            Log.d("AsyncTask", "onPreExecute");
            TextView txt = (TextView) findViewById(R.id.output);
            txt.setText("onPreExecute");
            progressBar.setMax(500);
            progressBar.setProgress(0);
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            Log.d("AsyncTask", "onProgressUpdate "+values[0]);
            TextView txt = (TextView) findViewById(R.id.output);
            txt.setText("onProgressUpdate "+values[0]);

            ObjectAnimator animation = ObjectAnimator.ofInt(progressBar, "progress", 100 * values[0]);
            animation.setDuration(1000);
            animation.setInterpolator(new LinearInterpolator());
            animation.start();
        }
    }
}

2018-11-14 09:38:59

private class AsyncTaskDemo extends AsyncTask<Void, Void, Void> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Showing progress dialog
        progressDialog = new ProgressDialog(this);
        progressDialog.setMessage("Loading...");
        progressDialog.setCancelable(false);
        progressDialog.show();
    }

    @Override
    protected Void doInBackground(Void... arg0) {

        // Do code here

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        // Dismiss the progress dialog
        if (progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
    }

    @Override
    protected void onCancelled() {

        super.onCancelled();
        progressDialog.dismiss();
        Toast toast = Toast.makeText(
                          getActivity(),
                          "An error is occurred due to some problem",
                          Toast.LENGTH_LONG);
        toast.setGravity(Gravity.TOP, 25, 400);
        toast.show();
    }

}

2014-08-26 04:12:11

异步操作的最短示例:

class MyAsyncTask extends android.os.AsyncTask {
    @Override
    protected Object doInBackground(Object[] objects) {
        // Do something asynchronously
        return null;
    }
}

运行它:

(new MyAsyncTask()).execute();

2014-06-12 11:17:03

移动这两条线:

TextView txt = (TextView) findViewById(R.id.output);
txt.setText("Executed");

你的AsyncTask的doInBackground方法，并把它们放在onPostExecute方法。你的AsyncTask应该看起来像这样:

private class LongOperation extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... params) {
        try {
            Thread.sleep(5000); // no need for a loop
        } catch (InterruptedException e) {
            Log.e("LongOperation", "Interrupted", e);
            return "Interrupted";
        }
        return "Executed";
    }      

    @Override
    protected void onPostExecute(String result) {               
        TextView txt = (TextView) findViewById(R.id.output);
        txt.setText(result);
    }
}

2012-03-12 17:16:50

AsyncTask Android示例

推荐文章

最新文章

标签