之前執行的線程

Question

我在調用新線程時遇到了一些問題。

我正在製作一個錄音應用程序，並且我在不同的線程中調用了錄製/回放。

有一個按鈕可以開始錄製。我試圖通過一個handler.post對象和方法用新文本更新按鈕。

問題是需要花費很長時間來更新。文本不會更新，直到線程運行+5秒後纔會更新。

有人可以幫我嗎？請？

package com.EJH.Industries.microkr; 

import android.media.AudioFormat; 
import android.media.AudioManager; 
import android.media.AudioRecord; 
import android.media.AudioTrack; 
import android.media.MediaRecorder; 
import android.media.MediaSyncEvent; 
import android.os.Bundle; 
import android.os.Handler; 
import android.app.Activity; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.Toast; 
import android.support.v4.app.NavUtils; 

public class MainActivity extends Activity { 
//CLASS VARIABLES 
    //CHAR SEQUENCE 
    CharSequence easyChar = "PLAYING"; 
    public Handler textViewHandler = new Handler(); 

    //CREATE THE RECORDING OBJECT 
    int audioSrc = MediaRecorder.AudioSource.MIC; 
    int sampleRate = 44100; 
    int chanConfig = AudioFormat.CHANNEL_IN_MONO; 
    int audioFormat = AudioFormat.ENCODING_PCM_16BIT; 
    int getMinBuffSize = 200*AudioRecord.getMinBufferSize(sampleRate, chanConfig, audioFormat); 
    int minBuffSize = (int) getMinBuffSize; 
    short audioBuff[] = new short[minBuffSize]; 
    public AudioRecord micRecorder = new AudioRecord(audioSrc, 22050, chanConfig, audioFormat, minBuffSize); 



    //CREATE THE PLAYBACK OBJECT 
    int streamType = AudioManager.STREAM_MUSIC; 
    int playMode = AudioTrack.MODE_STREAM; 
    int playChanConfig = AudioFormat. CHANNEL_OUT_MONO; 
    public AudioTrack speakerPlay = new AudioTrack(streamType, sampleRate, playChanConfig, audioFormat, 8192, playMode); 



    public void startRec(){ 
     micRecorder.startRecording(); 
     micRecorder.read(audioBuff, 0, minBuffSize); 
     micRecorder.stop(); 
     micRecorder.release(); 
    } 

    public void startPlayback(){ 

     speakerPlay.play(); 
     speakerPlay.write(audioBuff, 0, minBuffSize); 
     speakerPlay.stop(); 

    } 









    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     final Button startBtn = (Button) findViewById(R.id.startButton); 
     startBtn.setOnClickListener(new OnClickListener(){ 

      public void onClick(View v) { 
       // TODO Auto-generated method stub 


       Thread recThread = new Thread(new Runnable(){ 

        public void run() { 
         // TODO Auto-generated method stub 


         textViewHandler.post(new Runnable() { 
          public void run(){ 
           startBtn.setText("Recording!"); 
          } 

         }); 


         startRec(); 
        } 

       }); 

       // RUN RECORDING FUNCTION 
       recThread.run(); 
       try { 
        recThread.join(); 
       } catch (InterruptedException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 


       Thread playThread = new Thread(new Runnable(){ 

        public void run() { 
         // TODO Auto-generated method stub 

         startPlayback(); 
        } 

       }); 





       playThread.run(); 
       try { 
        playThread.join(); 
       } catch (InterruptedException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 


      } 

     }); 

    ///////END onCreate//////////  
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.activity_main, menu); 
     return true; 
    } 


} 

Answer 1

我想是這樣那是因爲你首先調用STARTREC（），然後運行recThread..try修改代碼below..that是從上面recThread.run刪除您STARTREC（）函數（ ）行，並添加它之後嘗試catch..hope它幫助你..

Thread recThread = new Thread(new Runnable(){ 

        public void run() { 
         // TODO Auto-generated method stub 


         textViewHandler.post(new Runnable() { 
          public void run(){ 
           startBtn.setText("Recording!"); 
          } 

         }); 

        //remove it from here.. 
         // startRec(); 
        } 

       }); 

    // RUN RECORDING FUNCTION 
       recThread.run(); 
       try { 
        recThread.join(); 
       } catch (InterruptedException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
       } 
    //add here.. 
       startRec();