安卓：錄音機帶定時

Question

我想開發的應用程序，它記錄音頻& playback.I是能夠記錄&播放錄製的文件。現在我想在錄製音頻或聲音時顯示錄製時間。搜索谷歌&許多事情無法得到它的任何想法。有誰能說我如何着手下一步。

這裏是我的錄音代碼計時器

public class AudioRecordActivity extends Activity implements OnClickListener { 

MediaRecorder recorder = new MediaRecorder(); 
private String fileName; 
private Button record; 
private Button play; 
private Button stop; 
private TextView timeDisplay; 
Chronometer myChronometer; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    record = (Button) findViewById(R.id.recordButton); 
    record.setOnClickListener(this); 

    play = (Button) findViewById(R.id.playButton); 
    play.setOnClickListener(this); 

    stop = (Button) findViewById(R.id.stopButton); 
    stop.setOnClickListener(this); 

    myChronometer = (Chronometer) findViewById(R.id.timer); 
    record.setOnClickListener(new Button.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      myChronometer.start(); 
     } 
    }); 

    stop.setOnClickListener(new Button.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      myChronometer.stop(); 

     } 
    }); 
} 

@Override 
public void onClick(View v) { 
    switch (v.getId()) { 
    case R.id.recordButton: 
     try { 

      stop.setEnabled(true); 
      record.setEnabled(false); 

      startRecording(); 
     } catch (IOException e) { 
      System.out.println(e + ""); 
      e.printStackTrace(); 
     } 
     break; 
    case R.id.stopButton: 

     stop.setEnabled(false); 
     record.setEnabled(true); 
     stopRecording(); 

     break; 

    case R.id.playButton: 
     Intent intent = new Intent(); 
     // PLAY ANY AUDIO/VIDEO FILE 
     intent.setAction(android.content.Intent.ACTION_VIEW); 
     File file = new File("/sdcard/" + fileName); 
     intent.setDataAndType(Uri.fromFile(file), "audio/*"); 
     startActivity(intent); 
     break; 

    default: 
     break; 
    } 

} 

void startRecording() throws IOException { 
    SimpleDateFormat timeStampFormat = new SimpleDateFormat(
      "yyyy-MM-dd-HH.mm.ss"); 
    // fileName = "audio_" + timeStampFormat.format(new Date()) + ".mp4"; 
    fileName = "audioTest" + ".mp4"; 

    recorder = new MediaRecorder(); 

    recorder.setAudioSource(MediaRecorder.AudioSource.MIC); 

    recorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR); 

    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 

    recorder.setOutputFile("/sdcard/" + fileName); 

    recorder.setAudioEncodingBitRate(320); 
    recorder.setAudioSamplingRate(16000); 
    recorder.setAudioChannels(2); 
    recorder.prepare(); 

    recorder.start(); 

} 

private void stopRecording() { 
    if (null != recorder) { 
     try { 
      recorder.stop(); 
      recorder.reset(); 
      recorder.release(); 
      recorder = null; 
     } catch (NullPointerException e) { 
      Toast.makeText(getApplicationContext(), 
        "Recording not started", Toast.LENGTH_SHORT).show(); 
      e.printStackTrace(); 
     } 
    } 
} 

@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    // TODO Auto-generated method stub 
    if (KeyEvent.KEYCODE_BACK == keyCode) { 
     finish(); 
    } 
    return super.onKeyDown(keyCode, event); 
} 
} 

這裏我logcat的錯誤

05-16 16:11:11.603: E/AndroidRuntime(21256): FATAL EXCEPTION: main 
05-16 16:11:11.603: E/AndroidRuntime(21256): java.lang.RuntimeException: Unable to start  activity ComponentInfo{xxx.com/xxx.com.AudioRecordActivity}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.Chronometer 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.app.ActivityThread.access$600(ActivityThread.java:123) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.os.Handler.dispatchMessage(Handler.java:99) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.os.Looper.loop(Looper.java:137) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.app.ActivityThread.main(ActivityThread.java:4424) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at java.lang.reflect.Method.invokeNative(Native Method) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at java.lang.reflect.Method.invoke(Method.java:511) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at dalvik.system.NativeStart.main(Native Method) 
05-16 16:11:11.603: E/AndroidRuntime(21256): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.Chronometer 
05-16 16:11:11.603: E/AndroidRuntime(21256): at xxx.com.AudioRecordActivity.onCreate(AudioRecordActivity.java:45) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.app.Activity.performCreate(Activity.java:4465) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
05-16 16:11:11.603: E/AndroidRuntime(21256): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 

謝謝...

Answer 1

這個你應該嘗試天文臺表，通過這個可以實現你的目標好運

天文臺的示例代碼是在這裏：

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello" 
    /> 
<Chronometer 
android:id="@+id/chronometer" 
android:layout_gravity="center_horizontal" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
/> 
<Button 
android:id="@+id/buttonstart" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Start" 
/> 
<Button 
android:id="@+id/buttonstop" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Stop" 
/> 
<Button 
android:id="@+id/buttonreset" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Reset" 
/> 
</LinearLayout> 

在Java文件

package com.exercise.AndroidChronometer; 

import android.app.Activity; 
import android.os.Bundle; 
import android.os.SystemClock; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Chronometer; 

public class AndroidChronometer extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     final Chronometer myChronometer = (Chronometer)findViewById(R.id.chronometer); 
     Button buttonStart = (Button)findViewById(R.id.buttonstart); 
     Button buttonStop = (Button)findViewById(R.id.buttonstop); 
     Button buttonReset = (Button)findViewById(R.id.buttonreset); 

     buttonStart.setOnClickListener(new Button.OnClickListener(){ 

    @Override 
    public void onClick(View v) { 
    // TODO Auto-generated method stub 
    myChronometer.start(); 
    }}); 

     buttonStop.setOnClickListener(new Button.OnClickListener(){ 

    @Override 
    public void onClick(View v) { 
    // TODO Auto-generated method stub 
    myChronometer.stop(); 

    }}); 

     buttonReset.setOnClickListener(new Button.OnClickListener(){ 

    @Override 
    public void onClick(View v) { 
    // TODO Auto-generated method stub 
    myChronometer.setBase(SystemClock.elapsedRealtime()); 

    }}); 


    } 
}