问题
I am trying to record video to an external SD card. However, everytime I try and acutally record the data -- I always get a java.io.FileNotFound exception. I was wondering if anyone knew of any tutorials or could help correct my code.
Here is the class in which tries to record video
public class VideoActivity extends Activity {
private SurfaceView preview;
private SurfaceHolder previewHolder;
private String locationName;
private String filepath;
private File video;
public void onCreate(Bundle videocawk) {
super.onCreate(videocawk);
setContentView(R.layout.video_layout);
setSurface();
locationName = getIntent().getStringExtra("locationName");
filepath = getFilePath(locationName);
try {
MediaRecorder r = getMediaRecorder(filepath, previewHolder
.getSurface());
setSurfaceCallback(preview,r);
setButtonListeners(r);
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private String getFilePath(String locName) {
String dir = Environment.getExternalStorageDirectory().getAbsolutePath();
String add = "/test/data/video/";
String name = locName + "--1";
String total = dir + add + name;
video = new File(total);
return total;
}
private void setSurface() {
preview = (SurfaceView) findViewById(R.id.preview);
previewHolder = preview.getHolder();
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
private void setButtonListeners(final MediaRecorder r) {
Button start = (Button) findViewById(R.id.start_video);
Button end = (Button) findViewById(R.id.stop_video);
start.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startRecording(r);
}
});
end.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
stopRecording(r);
setPassPrefs();
startActivity(setPassPrefs());
finish();
}
});
}
private void setSurfaceCallback(SurfaceView s, final MediaRecorder r)
{
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
try {
r.setPreviewDisplay(previewHolder.getSurface());
} catch (Throwable t) {
Log.e("PictureDemo-surfaceCallback",
"Exception in setPreviewDisplay()", t);
Toast.makeText(VideoActivity.this, t.getMessage(),
Toast.LENGTH_LONG).show();
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
public void surfaceDestroyed(SurfaceHolder holder) {
r.stop();
r.release();
}
};
previewHolder.addCallback(surfaceCallback);
}
private Intent setPassPrefs() {
AttachedImageAdapter adapter = new AttachedImageAdapter(locationName,
VideoActivity.this);
adapter.setVideoPath(filepath);
Intent i = new Intent(VideoActivity.this, EnterTag.class);
i.putExtras(getIntent());
return i;
}
private void startRecording(MediaRecorder r) {
r.start();
}
private void stopRecording(MediaRecorder r) {
r.stop();
}
private MediaRecorder getMediaRecorder(String filepath, Surface s)
throws IllegalStateException, IOException {
MediaRecorder m_recorder = new MediaRecorder();
m_recorder.setPreviewDisplay(s);
m_recorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
m_recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
m_recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
m_recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
m_recorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
m_recorder.setMaxDuration(20000); // length of video in MS
m_recorder.setVideoSize(320, 240);
m_recorder.setVideoFrameRate(15);
m_recorder.setOutputFile(video.getPath());
m_recorder.prepare();
return m_recorder;
}
}
Any help would be appreciated -- and thanks again in advance. Also, here is a pastebin that has the layout that the video activity references.
Here is the PasteBin of my error log -- if it helps.
回答1:
Two things I can think of:
1: Your SD Card may not be mounted.
if (android.os.Environment.getExternalStorageState() != android.os.Environment.MEDIA_MOUNTED) then you have a problem.
2: All of the directories in path to the file may not exist.
filepath = getFilePath(locationName);
File file = new File(filepath);
File parentDir = file.getParentFile();
if (!parentDir.exists())
{
parentDir.mkdirs();
}
来源：https://stackoverflow.com/questions/3225763/record-video-to-external-sd-card-on-android