在下面的代码中，我的
我为什么会得到这些错误？
audioRecord对象没有初始化。我尝试将其移动到onCreate方法并将其设为全局变量。我已经记录了状态，并返回了一个值为1，表示可以使用。调试器说startRecording被调用时对象未初始化。它还说无法获取音频源。我为什么会得到这些错误？
package com.tecmark;
import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
public class recorder extends Activity {
private Thread thread;
private boolean isRecording;
private AudioRecord recorder;
private FileOutputStream os;
private BufferedOutputStream bos;
private DataOutputStream dos;
private TextView text;
private int audioSource = MediaRecorder.AudioSource.MIC;
private int sampleRate = 22050;
private int channel = AudioFormat.CHANNEL_CONFIGURATION_MONO;
private int encoding = AudioFormat.ENCODING_PCM_16BIT;
private int result = 0;
private int bufferSize;
private byte[] buffer;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.v("onCreate", "layout set, about to init audiorec obj");
text = (TextView)findViewById(R.id.TextView01);
bufferSize = AudioRecord.getMinBufferSize(sampleRate,channel,encoding);
buffer = new byte[bufferSize];
recorder = new AudioRecord(audioSource, sampleRate,channel,encoding,
AudioRecord.getMinBufferSize(sampleRate, channel,encoding));
Log.i("recorder obj state",""+recorder.getRecordingState());
}
public void onClickPlay(View v){
}
public void record(){
Log.i("inside record method", "******");
File path = Environment.getExternalStorageDirectory();
Log.v("file path", ""+path.getAbsolutePath());
File file = new File(path, "test.wav");
if(file.exists()){
file.delete();
}
path.mkdirs();
Log.v("file path", ""+file.getAbsolutePath());
try {
os = new FileOutputStream(file);
bos = new BufferedOutputStream(os);
dos = new DataOutputStream(bos);
} catch (Exception e1) {
e1.printStackTrace();
}
int bufferSize = AudioRecord.getMinBufferSize(sampleRate,channel,encoding);
byte[] buffer = new byte[bufferSize];
recorder.startRecording();
isRecording = true;
try{
while (isRecording){
result = recorder.read(buffer, 0, bufferSize);
for(int a=0; a<result;a++){
dos.write(buffer[a]);
if(!isRecording){
recorder.stop();
break;
}
}
}
dos.flush();
dos.close();
}catch(Exception e){
e.printStackTrace();
}
}// end of record method
public void onClickStop(View v){
Log.v("onClickStop", "stop clicked");
isRecording=false;
}
public void onClickReverse(View v){
Log.v("onClickReverse", "reverse clicked");
}
public void onClickRecord(View v){
Log.v("onClickRecourd", "record clicked, thread gona start");
text.setText("recording");
thread = new Thread(new Runnable() {
public void run() {
isRecording = true;
record();
}
});
thread.start();
isRecording = false;
}
}//end of class
Logcat
01-30 15:23:16.724: ERROR/AudioRecord(12817): Could not get audio input for record source 1 01-30 15:23:16.729:
ERROR/AudioRecord-JNI(12817): Error creating AudioRecord instance: initialization check failed. 01-30 15:23:16.729:
ERROR/AudioRecord-Java(12817): [ android.media.AudioRecord ] Error code
-20 when initializing native AudioRecord object. 01-30 15:23:16.729: INFO/recorder obj state(12817): 1 01-30 15:23:16.729:
WARN/dalvikvm(12817): threadid=13: thread exiting with uncaught exception (group=0x4001b180) 01-30 15:23:16.729:
ERROR/AndroidRuntime(12817): Uncaught handler: thread Thread-7 exiting due to uncaught exception 01-30 15:23:16.739:
ERROR/AndroidRuntime(12817): java.lang.IllegalStateException: startRecording() called on an uninitialized AudioRecord. 01-30 15:23:16.739:
ERROR/AndroidRuntime(12817): at android.media.AudioRecord.startRecording(AudioRecord.java:495) 01-30 15:23:16.739:
ERROR/AndroidRuntime(12817): at com.tecmark.recorder.record(recorder.java:114) 01-30 15:23:16.739:
ERROR/AndroidRuntime(12817): at com.tecmark.recorder$1.run(recorder.java:175) 01-30 15:23:16.739:
ERROR/AndroidRuntime(12817): at java.lang.Thread.run(Thread.java:1096)