我正在尝试使用MediaRecorder和MediaPlayer，
我已经以这种方式设置了MediaRecorder：
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mRecorder.setOutputFile(getFilename());
try {
mRecorder.prepare();
} catch (IOException e) {
e.printStackTrace();
}
Context context = getApplicationContext();
CharSequence text = "Start recording";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
mRecorder.start();
String filename = getFilename();
以这种方式取消了它：
if (null != mRecorder) {
mRecorder.stop();
mRecorder.reset();
mRecorder.release();
mRecorder = null; }
我以这种方式使用getFilename作为outputFile：
private String getFilename() {
File file = new File("/sdcard/20MinRecord/");
if (!file.exists()) {
file.mkdirs();
}
String mydate = java.text.DateFormat.getDateTimeInstance().format(
Calendar.getInstance().getTime());
return (file.getAbsolutePath() + "/" + mydate + ".mp3");
}
我尝试将MediaPlayer用于录制的文件：
public String filename;
....
// When I started my recorder I got the file name into String like this:
String filename = getFilename();
....
// Starting the MediaPlayer:
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setDataSource(filename);
mediaPlayer.prepare();
mediaPlayer.start();
我遇到了MediaPlayer的问题，我使用try / catch解决了它们：
null != mRecorder) {
MediaPlayer mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(filename);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
mediaPlayer.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.start();
但是当我尝试使用MediaPlayer，LOGCAT：
时，我的应用程序崩溃了07-27 16:55:33.156: D/MediaPlayer[Native](11856): calling notify_player_state: 1
07-27 16:55:33.156: V/MediaPlayer[Native](11856): setListener
07-27 16:55:33.156: E/ExtMediaPlayer-JNI(11856): QCMediaPlayer could not be located....
07-27 16:55:33.156: E/MediaPlayer-JNI(11856): QCMediaPlayer mediaplayer NOT present
07-27 16:55:33.156: D/AndroidRuntime(11856): Shutting down VM
07-27 16:55:33.156: W/dalvikvm(11856): threadid=1: thread exiting with uncaught exception (group=0x417bee48)
07-27 16:55:33.156: I/ViewRootImpl(11856): ViewRoot's Touch Event : ACTION_UP
07-27 16:55:33.166: V/AudioSystem(11856): ioConfigChanged() event 0, ioHandle 3
07-27 16:55:33.166: V/AudioSystem(11856): ioConfigChanged() new output samplingRate 48000, format 1 channel mask 0x3 frameCount 960 latency 50
07-27 16:55:33.166: E/AndroidRuntime(11856): FATAL EXCEPTION: main
07-27 16:55:33.166: E/AndroidRuntime(11856): Process: com.FAD.recordthelast20minutes, PID: 11856
07-27 16:55:33.166: E/AndroidRuntime(11856): java.lang.NullPointerException: uriString
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.net.Uri$StringUri.<init>(Uri.java:467)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.net.Uri$StringUri.<init>(Uri.java:457)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.net.Uri.parse(Uri.java:429)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1059)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1024)
07-27 16:55:33.166: E/AndroidRuntime(11856): at com.FAD.recordthelast20minutes.RecordActivity$3.onClick(RecordActivity.java:139)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.view.View.performClick(View.java:4461)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.view.View$PerformClick.run(View.java:18525)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.os.Handler.handleCallback(Handler.java:733)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.os.Handler.dispatchMessage(Handler.java:95)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.os.Looper.loop(Looper.java:136)
07-27 16:55:33.166: E/AndroidRuntime(11856): at android.app.ActivityThread.main(ActivityThread.java:5118)
07-27 16:55:33.166: E/AndroidRuntime(11856): at java.lang.reflect.Method.invokeNative(Native Method)
07-27 16:55:33.166: E/AndroidRuntime(11856): at java.lang.reflect.Method.invoke(Method.java:515)
07-27 16:55:33.166: E/AndroidRuntime(11856): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
07-27 16:55:33.166: E/AndroidRuntime(11856): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:610)
07-27 16:55:33.166: E/AndroidRuntime(11856): at dalvik.system.NativeStart.main(Native Method)
07-27 16:55:33.176: V/AudioSystem(11856): ioConfigChanged() event 3, ioHandle 669
全部谢谢：）
答案 0 :(得分：1)
您确定getFilename（）方法是否正常工作（例如创建目录？）您可以尝试使用静态路径（存在）和文件名进行测试。