Android: Handlers within Fragments *.post()?

Question

我正在将代码从单片活动迁移到Big Nerd Ranch (CriminalIntent ch 21, https://www.bignerdranch.com/solutions/AndroidProgramming2e.zip)规定的片段/寻呼机设置。不错的书，顺便说一句:)

在这样做时，我将以下代码添加到片段CrimeCameraFragment中，以将相机照片记录替换为音频记录。当这样做时，我试图使用的处理程序没有访问.post的某种原因"错误:找不到符号方法post"?

public class Whatever extends fragment{
the onCreateView code{
button.setOnClickListener(...){
    audioRecord.startRecording();
    mHandler.post(updateTimerThread);
    };

则有以下timerTask:

//timer code ---------------------------------------------------------------------
public TimerTask updateTimerThread = new TimerTask(){
    public void run(){
        currentTime = SystemClock.uptimeMillis();
        elapsedTime = currentTime - startTime;
        if(elapsedTime< recordingDurationInMilliseconds)
        {
            //First we read the audio buffer -----------
            int bufferRead = audioRecord.read(buffer, 0, readBufferSize);
            double dataDbl = processData(buffer, bufferRead);
            //Put the data and time stamp into arrays
            dataArray.add(dataDbl);
            timeArray.add(elapsedTime);
            //then fire up a new runnable
            mHandler.postDelayed(this, delayMillis);
        }
        else //if elapsed time is > max record time
        {
            stopRecording();
        };
    }
};

处理程序为空以启动

private Handler mHandler = null;

然后自动生成代码:

mHandler = new Handler() {
            @Override
            public void close() {}
            @Override
            public void flush() {}
            @Override
            public void publish(LogRecord record) {}
        };

知道我的Handler在哪吗?Post功能消失了?

谢谢!

Answer 1

你的Handler类不是Android的Handler类，它是一个在java包中同名的Handler类。只需删除导入代码并再次导入即可。检查它必须来自android包。如果我没记错的话应该是android.os.Handler