我有两个异步任务(的子类MainActivity
),它们同时下载一些数据。他们被称为
new LoadData(url).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
我希望他们都更新 aProgressBar
但我想不出一种方法来setProgress
从两个同时线程中获取,以便每个线程贡献 50% 的进度。
public class MainActivity extends Activity {
private static double staticvariable = 0;
private ProgressBar progbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progbar = (ProgressBar) findViewById(R.id.progressBar1);
new LoadData("http://stackoverflow.com")
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
new LoadData("http://stackoverflow.com")
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
private class LoadData extends AsyncTask<String, Void, String> {
private String weburl;
public LoadData(String url) {
this.weburl = url;
System.out.println("Starting Download");
}
protected String doInBackground(String... params) {
System.out.println("point 1");
URLConnection conn = null;
URL url = null;
try {
url = new URL(weburl);
conn = url.openConnection();
conn.connect();
InputStream in = null;
in = new BufferedInputStream(url.openStream());
int fileSize = conn.getContentLength();
double taskProgress;
int count;
byte buffer[] = new byte[1024];
while ((count = in.read(buffer)) != -1) {
taskProgress = 50 * ((double) count) / ((double) fileSize);
staticvariable += taskProgress;
progbar.setProgress((int) staticvariable);
}
in.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("finished at " + (int) staticvariable + "%");
return null;
}
}
}
我认为解决方案在于使用静态变量自增,count/fileSize
如上所示,但我得到了一些奇怪的结果。在每次下载结束时,我将完成百分比打印到我得到的控制台:
完成 916%
和
完成率为 926%
我不知道这些数字是从哪里来的。有任何想法吗?
编辑 只运行一个 AsyncTask 输出:
完成 447%