Question

您好我正在开发一款应用程序，首次启动应用程序时需要下载量非常大（100-200MB）。

我的第一个活动是启动一项服务，该服务具有执行所有下载的asynctask。

为了显示我的下载进度，我正在执行以下操作：

首先使用AsyncTask的publishProgress / onProgressUpdate我使用当前进度向我的活动发送广播：

@Override
protected Void doInBackground(Void... params) { 
  ...
  publishProgress(Integer.toString(completedFiles), current_filename, Integer.toString(file_progress));
  ...
}
@Override
protected void onProgressUpdate(String... progress) {
        super.onProgressUpdate(progress);
        progressBroadcast.putExtra(NOTIFY_DOWNLOAD_PROGRESS, progress);
        sendOrderedBroadcast(progressBroadcast, null);
}

在我的活动上，我有一个更新进度条的BroadcastReceiver

    private class ProgressReceiver extends BroadcastReceiver{

    private int totalFiles;

    public ProgressReceiver(Context context) {
        progressDialog = new ProgressDialog(context);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if(ResourceDownloadService.NOTIFY_DOWNLOAD_START.equals(action)){               
            progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            progressDialog.setCancelable(false);
            progressDialog.setTitle(getString(R.string.loading_res_dialog_title));
            totalFiles = intent.getIntExtra(ResourceDownloadService.TOTAL_FILES, 0);
            progressDialog.setMessage("Downloading Resources");
            progressDialog.show();
        }else if(ResourceDownloadService.NOTIFY_DOWNLOAD_END.equals(action)){
            //Hide progress bar one we are done
            progressDialog.dismiss();
            startIntroActivity();
        }else{
            String[] progress_info = intent.getExtras().getStringArray(ResourceDownloadService.NOTIFY_DOWNLOAD_PROGRESS);
            int completedFiles = Integer.parseInt(progress_info[0]);
            String filename = progress_info[1];
            int progress = Integer.parseInt(progress_info[2]);
            progressDialog.setProgress(progress);
            progressDialog.setMessage("Downloading "+filename +"\n"+completedFiles +" files downloaded of "+totalFiles);
        }
    }

}

所以我不确定我在这里做错了什么，因为几秒后进度条显示我得到一个ANR。

可能是因为我发送过多广播来更新进度条吗？

Answer 1

我唯一能想到的是ANR是由于进度对话框长时间禁用交互，请尝试删除对话框并使用其他方法通知用户进度。

像这样的东西

public interface Listener {

    public abstract void onEvent();

}

在广播接收器中创建静态引用和setter

私有静态MessageListener mListener = null;

@Override
public void onReceive(Context context, Intent intent) {
    //stuff
    if(mListener != null)
         mListener.onEvent();   
}

public static void setListener(Listener l) {
    mListener = l;
}

然后在Activity

中实现监听器

class MyActivity implements Listener{

@Override
public void onResume(){
    //register the listener so that when the activity is visible it can receive updates
    BroadCastReceiver.setListener(this);
}

@Override
public void onPause(){
    //unregister the listener so the activity doesn't receive updates while in the background
    BroadCastReceiver.setListener(null);
}
@Override
public void onEvent(){
    //update the UI
}
}

长时间运行的ProgressDialog显示应用程序未响应（ANR）对话框

1 个答案: