我正在尝试使用以下代码在Android 2.2.1（设备Samsung Galaxy POP）上调用录音机：
private static final int ACTIVITY_RECORD_SOUND = 1;
Intent intent = new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION);
startActivityForResult(intent, ACTIVITY_RECORD_SOUND);
这会成功调用录音机。在我的活动结果中，我执行以下操作：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
switch (requestCode) {
case ACTIVITY_RECORD_SOUND:
data.getDataString();
break;
}
}
}
完成录制后，我按回录音机，按预期将控制返回到onActivityResult方法，但我的resultCode始终为0（即Activity.RESULT_CANCELED），我的数据为空。我错过了这里的东西吗？请帮助我。这适用于模拟器，但不适用于设备。提前谢谢。
答案 0 :(得分：2)
这对我有用：
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
switch(requestCode) {
case Flashum.TAKE_MUSIC:
case Flashum.TAKE_VOICE:
if (resultCode == Activity.RESULT_OK)
{
Log.i(Flashum.LOG_TAG, "onActivityResult got new music");
Bundle extras = data.getExtras();
try {
Uri u = data.getData();
String imageUri;
try {
imageUri = getRealPathFromURI(u);
} catch (Exception ex) {
imageUri = u.getPath();
}
File file = new File(imageUri);
FragmentFlash fragmentFlash = (FragmentFlash)mTabsAdapter.getFragment("flash");
if (fragmentFlash != null)
fragmentFlash.gotMusic(file.getPath());
} catch (Exception ex) {
String s = ex.toString();
Log.i(Flashum.LOG_TAG, "onActivityResult " + s);
}
}
else
{
Log.i(Flashum.LOG_TAG, "onActivityResult Failed to get music");
}
break;
}
}
public String getRealPathFromURI(Uri contentUri) {
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
答案 1 :(得分：0)
我终于通过使用FileObserver找到了解决问题的方法。我通过以下方式实现了它：
package com.pravaa.audiointent;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Vector;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.FileObserver;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;
public class AudioActivity extends Activity implements OnClickListener {
/** Called when the activity is first created. */
private Button sampleButton;
private FileObserver mFileObserver;
private Vector<String> audioFileNames;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
audioFileNames = new Vector<String>();
LinearLayout finalContainer = new LinearLayout(this);
sampleButton = new Button(this);
sampleButton.setOnClickListener(this);
sampleButton.setText("Start Audio Intent");
finalContainer.addView(sampleButton);
setContentView(finalContainer);
addObserver();
}
private void addObserver() {
this.mFileObserver = new FileObserver("/sdcard/Sounds/") {
@Override
public void onEvent(int event, String path) {
if (event == FileObserver.CREATE) {
if (path != null) {
int index = path.indexOf("tmp");
String tempFileName = (String) path.subSequence(0,
index - 1);
audioFileNames.add(tempFileName);
}
} else if (event == FileObserver.DELETE) {
if (path != null) {
int index = path.indexOf("tmp");
String tempFileName = (String) path.subSequence(0,
index - 1);
if (audioFileNames.contains(tempFileName)) {
audioFileNames.remove(tempFileName);
}
}
}
}
};
}
private void readFile(String fileName) {
File attachment = new File("/sdcard/Sounds/" + fileName);
if (attachment.exists()) {
FileInputStream fis;
try {
fis = new FileInputStream(attachment);
byte[] bytes = new byte[(int) attachment.length()];
try {
fis.read(bytes);
fis.close();
attachment.delete();
saveMedia("Test" + fileName, bytes);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
mFileObserver.startWatching();
}
public void saveMedia(String fileName, byte[] data) {
String imagePath = "/sdcard/sam/";
System.out.println("Inside Folder");
File file = new File(imagePath, fileName);
System.out.println("File Created");
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream(file);
DataOutputStream dataOutputStream = new DataOutputStream(
fileOutputStream);
System.out.println("Writting File");
dataOutputStream.write(data, 0, data.length);
System.out.println("Finished writting File");
dataOutputStream.flush();
dataOutputStream.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION);
startActivityForResult(intent, 2);
}
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
// TODO Auto-generated method stub
if (requestCode == 2) {
if (mFileObserver != null) {
mFileObserver.stopWatching();
}
Enumeration<String> audioFileEnum = audioFileNames.elements();
while (audioFileEnum.hasMoreElements()) {
readFile((String) audioFileEnum.nextElement());
}
}
}}
答案 2 :(得分：0)
我面临同样的问题..所以我没有使用意图，而是使用了MediaRecorder类及其相关的方法，如setAudioEncoder，setAudioSource，prepare，start，stop，setOutputFormat和setOutputFile ..现在工作正常.. < / p>
答案 3 :(得分：0)
我也同意目前为止的最佳答案（由问题所有者投票），但它无法读取文件，因为它是一条不同的路径。我的建议是将文件名存储为成员变量，只调用一次getFilename（）。
答案 4 :(得分：-4)
Galaxy Android设备存在一个已知问题，即结果意图为空，您希望它们包含照片。这也可能适用于此。请参阅http://kevinpotgieter.wordpress.com/2011/03/30/null-intent-passed-back-on-samsung-galaxy-tab/。
解决此问题的一种方法是添加
intent.putExtra(MediaStore.EXTRA_OUTPUT, someFileUri);
根据您的意图，明确告知目标应用程序存储生成的文件的位置。
如果您需要帮助创建一个好的文件Uri，请查看此example。