andriod 错误：Only the original thread that created a view hierarchy can touch its views——Handler的使用

package com.example.yanlei.myapplication;

import android.media.MediaMetadataRetriever;
import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.Toast;
import android.widget.VideoView;
import android.widget.SeekBar.OnSeekBarChangeListener;

import java.io.File;
import java.util.HashMap;

import android.os.Handler;

 

  private Handler handler = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        seekBar = (SeekBar) findViewById(R.id.seekBar);
        
        // 为进度条添加进度更改事件
        seekBar.setOnSeekBarChangeListener(change);

        //创建属于主线程的handler
        handler = new Handler();

    }

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protected void play(int msec) {       Log.i(TAG, " 获取视频文件地址");       String path = et_path.getText().toString().trim();       File file = new File(path);       if (!file.exists()) {           Toast.makeText(this, "视频文件路径错误", 0).show();           return;       }         Log.i(TAG, "指定视频源路径");       vv_video.setVideoPath(file.getAbsolutePath());       Log.i(TAG, "开始播放");       vv_video.start();         // 按照初始位置播放       vv_video.seekTo(msec);       // 设置进度条的最大进度为视频流的最大播放时长       final int time = getTimeLong(file.getAbsolutePath()) / 100;       seekBar.setMax(time);       Toast.makeText(this, "长度:" + time, Toast.LENGTH_LONG).show();       // 开始线程，更新进度条的刻度       new Thread() {             @Override           public void run() {               try {                   isPlaying = true;                   while (isPlaying) {                       // 如果正在播放，0.1.毫秒更新一次进度条                       final int current = vv_video.getCurrentPosition() / 100;                       seekBar.setProgress(current);                    /*   try {                           myText = "总时间：" + time / 10 + "秒,目前：" + current / 10 + "秒";                           // pTextView.setText("总时间：" + time / 10 + "秒,目前：" + current / 10 + "秒");                           new WorkThread().start();                       } catch (Exception ex) {                             Log.d("错误:", ex.getMessage().toString());                       }*/                         new Thread() {                           public void run() {                               myText = "总时间：" + time / 10 + "秒,目前：" + current / 10 + "秒";                               handler.post(updateUIRunnable);                           }                       }.start();                         //Toast.makeText(this, "当前:"+current,Toast.LENGTH_LONG).show();                       sleep(100);                   }               } catch (Exception e) {                   e.printStackTrace();               }           }       }.start();       // 播放之后设置播放按钮不可用       btn_play.setEnabled(false);         vv_video.setOnCompletionListener(new OnCompletionListener() {             @Override           public void onCompletion(MediaPlayer mp) {               // 在播放完毕被回调               btn_play.setEnabled(true);           }       });         vv_video.setOnErrorListener(new OnErrorListener() {             @Override           public boolean onError(MediaPlayer mp, int what, int extra) {               // 发生错误重新播放               play(0);               isPlaying = false;               return false;           }       });   }     //工作线程   private class WorkThread extends Thread {       @Override       public void run() {           try {                 pTextView.setText(myText);           } catch (Exception ex) {               Log.e("严重错误:", ex.getMessage().toString());             }       }   }     // 构建Runnable对象，并在runnable中更新UI   Runnable updateUIRunnable = new Runnable() {       @Override       public void run() {           try {                 pTextView.setText(myText);           } catch (Exception ex) {               Log.e("严重错误:", ex.getMessage().toString());             }       }   };