android - 如何在 ListView 的每一行上创建一个线程

Question

我已经搜索了很多，但我没有达到我的目标

我的问题是

我有一个带有计时器的 ListView ，可以在每一行中倒计时当我点击一行时，计数器立即倒计时，但是当我点击另一行时，前一个计数器停止，当前计数器倒计时，但它将第二个计数为两秒。

所以我的问题是:-

我想让与点击的行相关的计数器运行。无需停止任何先前运行的计数器。

抱歉我的英语不好，在此先感谢您。

import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class RecipeStepsActivity extends Activity {
    ListView list;
    int minutes;
    int seconds;
    int hours;
    int time;
    TextView fullTime;
    TextView step;
    String fullTimeString;
    String[] fullTimeArray;
    MediaPlayer myTen ;
    Activity context;
    @SuppressLint("ShowToast")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recipe_steps);
        context=this;

        list = (ListView) findViewById(R.id.listId);
        list.setAdapter(new RecipeStepsListAdapter(RecipeStepsActivity.this,R.layout.activity_recipe_steps_list_adapter,XmlHandler.HashMapOfSteps.get(Main.position),XmlHandler.HashMapOfTime.get(Main.position)));

        list.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View v, int id,
                    long arg3) {
                // TODO Auto-generated method stub
                final String item = (String) parent.getItemAtPosition(id);
                fullTimeArray = new String[3];
                fullTimeArray = item.split(":");
                Toast.makeText(RecipeStepsActivity.this,
                        "h "+fullTimeArray[0]+":m "+fullTimeArray[1]+":s "+fullTimeArray[2], Toast.LENGTH_SHORT).show();

                step = (TextView)findViewById(R.id.step);
                fullTime = (TextView)findViewById(id);

                hours = Integer.parseInt(fullTimeArray[0]);
                minutes = Integer.parseInt(fullTimeArray[1]);
                seconds = Integer.parseInt(fullTimeArray[2]);
                time = (hours*60*60)+(minutes*60)+seconds;
                createCounterDownTimer();

            }
        });
    }




    public void createCounterDownTimer(){
        runOnUiThread( new Runnable() {
            public void run() {
                // TODO Auto-generated method stub


        new CountDownTimer(time * 1000, 1000) {

            @SuppressLint("NewApi")
            @Override
            public void onTick(long millisUntilFinished) {


                if(hours>0 && minutes == 0 && seconds == 0){
                    hours -- ;

                    fullTime.setText(hours+":"+minutes+":"+seconds);
                    fullTime.animate();
                    minutes = 60;
                }
                if( minutes>0 && seconds == 0){
                    minutes--;
                    fullTime.setText(hours+":"+minutes+":"+seconds);
                    fullTime.animate();
                    seconds = 60;
                    //seconds --;
                }
                if(seconds>0 ){
                    seconds--;
                    fullTime.setText(hours+":"+minutes+":"+seconds);
                    fullTime.animate();

                }

            }

            @Override
            public void onFinish() {
                // TODO Auto-generated method stub

            myTen = MediaPlayer.create(RecipeStepsActivity.this, R.raw.soundd);
            myTen.start();
            //this is a run for the ui ajax containing alertdialog
            runOnUiThread( new Runnable() {
                @SuppressWarnings("deprecation")
                public void run() {
                    fullTime.setText("time up!");
                    //showNotification();
                    AlertDialog alertDialog = new AlertDialog.Builder(RecipeStepsActivity.this).create();
                    alertDialog.setTitle("time up");
                    alertDialog.setMessage(step.getText().toString()+" is finished");
                    alertDialog.setButton("ok", new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // TODO Auto-generated method stub
                            myTen.stop();
                            dialog.cancel();
                        }
                    });

                    alertDialog.show();



                }
            });
            }

        }.start();

            }
        });
    }
    @Override

    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.recipe_steps, menu);
        return true;
    }
}

Answer 1

使用 AsyncTask 概念。通过使用它，您可以在不干扰 UI 线程的情况下运行多个线程。只要谷歌一下，你就会得到很多关于 AsyncTask 概念的教程。