Java Android异步任务运行多次

在我的应用程序中，有一个按钮可以从数据库中获取输入。当我在短时间内按下多个按钮时，它就会崩溃。 如何使用asynctask避免此错误

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谢谢…

您可以创建一个布尔标志，比如说bDiscardButtonAction，并在onPreExecute中将其设置为true，在onPostExecute中将其设置为false，类似于：

public class FooTask extends AsyncTask<Foo, Foo, Foo>
{
    private static boolean bDiscardButtonAction = false;
    private boolean isDiscareded = false;

    @Override
    public void onPreExecute()
    {
        if(bDiscardButtonAction)
        {
            isDiscareded = true;
            return;
        }

        bDiscardButtonAction = true;
    }

    @Override
    public Foo doInBackground(Foo... params)
    {
        if(isDiscareded) return;

        // ...
    }

    @Override
    public void onPostExecute(Void result)
    {
        if(!isDiscareded) bDiscardButtonAction = false;
    }

    @Override
    public void onCancelled(Foo result)
    {
        if(!isDiscareded) bDiscardButtonAction = false;
    }
}

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您可以创建一个布尔标志，比如bDiscardButtonAction，并在onPreExecute中将其设置为true，在onPostExecute中将其设置为false，类似于：

public class FooTask extends AsyncTask<Foo, Foo, Foo>
{
    private static boolean bDiscardButtonAction = false;
    private boolean isDiscareded = false;

    @Override
    public void onPreExecute()
    {
        if(bDiscardButtonAction)
        {
            isDiscareded = true;
            return;
        }

        bDiscardButtonAction = true;
    }

    @Override
    public Foo doInBackground(Foo... params)
    {
        if(isDiscareded) return;

        // ...
    }

    @Override
    public void onPostExecute(Void result)
    {
        if(!isDiscareded) bDiscardButtonAction = false;
    }

    @Override
    public void onCancelled(Foo result)
    {
        if(!isDiscareded) bDiscardButtonAction = false;
    }
}

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我希望这段代码能帮助你

         button.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View view) {
            new AsynchTaskManualLocation().execute();

    });



   public class AsynchTaskGetData extends AsyncTask<String,Void,String>
{
    @Override
    protected String doInBackground(String... url) {
        //showinf(); this method contains operation of getting data from         //database    OR ur logic to getdata
        return showinf();

    }

    @Override
    protected void onPostExecute(String result) {
      //here u get result in resul var and process the result here
        }
    }
}

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我希望这段代码能帮助你

         button.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View view) {
            new AsynchTaskManualLocation().execute();

    });



   public class AsynchTaskGetData extends AsyncTask<String,Void,String>
{
    @Override
    protected String doInBackground(String... url) {
        //showinf(); this method contains operation of getting data from         //database    OR ur logic to getdata
        return showinf();

    }

    @Override
    protected void onPostExecute(String result) {
      //here u get result in resul var and process the result here
        }
    }
}

在onPreExecute中禁用“显示”按钮，并在PostExecute上重新启用该按钮

在onPreExecute中禁用“显示”按钮，并在PostExecute上重新启用该按钮

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