所以我一直在寻找过去几天的解决方案，但似乎我无法找到任何解决方案。起初看起来很简单。
我有一个使用默认Android相机应用程序的应用程序使用intent捕获视频。视频录制工作正常，但文件格式为3gp。我想以mp4格式录制视频，但我不想实现自己的mediarecorder等来构建我自己的视频录制模块。
我还搜索了可以传递给文件格式意图的额外参数，但我不能。
我可以用任何额外的参数来选择文件格式吗？
感谢您的帮助！
答案 0 :(得分：2)
// Use this code to capture Mp4 video.
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.hardware.Camera;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends Activity{
private static final String TAG = MainActivity.class.getSimpleName();
private Camera myCamera;
private CameraSurfaceView cameraSurfaceView;
private MediaRecorder mediaRecorder;
Button myButton;
boolean recording;
public Context context;
private Uri fileUri;
public static final int MEDIA_TYPE_VIDEO = 2;
final Handler handler = new Handler();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
recording = false;
setContentView(R.layout.activity_main);
//Get Camera for preview
myCamera = getCameraInstance();
if(myCamera == null){
Log.w(TAG, "camera not found");
Toast.makeText(context,
"Fail to get Camera",
Toast.LENGTH_LONG).show();
}
cameraSurfaceView = new CameraSurfaceView(this, myCamera);
FrameLayout cameraPreview = (FrameLayout)findViewById(R.id.videoview);
cameraPreview.addView(cameraSurfaceView);
myButton = (Button)findViewById(R.id.mybutton);
myButton.setOnClickListener(myButtonOnClickListener);
}
Button.OnClickListener myButtonOnClickListener
= new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try{
if(recording){
// stop recording and release camera
mediaRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
//Exit after saved
//finish();
myButton.setText("REC");
recording = false;
Log.e("file path",fileUri.getPath());
}else{
//Release Camera before MediaRecorder start
releaseCamera();
if(!prepareMediaRecorder()){
Toast.makeText(context,
"Fail in prepareMediaRecorder()!\n - Ended -",
Toast.LENGTH_LONG).show();
finish();
}
mediaRecorder.start();
recording = true;
myButton.setText("STOP");
Runnable r = new Runnable() {
public void run() {
Timer timer = new Timer();
timer.schedule(doAsynchronousTask, 0, 10000);
}
};
handler.postDelayed(r, 10000);
}
}catch (Exception ex){
ex.printStackTrace();
}
}
};
private Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT); // attempt to get a Camera instance
c.setDisplayOrientation(90);
}
catch (Exception e){
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
TimerTask doAsynchronousTask = new TimerTask() {
@Override
public void run() {
handler.post(new Runnable() {
@SuppressWarnings("unchecked")
public void run() {
try {
if(recording ==true) {
recording = false;
Log.e("file path",fileUri.getPath());
doAsynchronousTask.cancel();
} else{
doAsynchronousTask.cancel();
}
}
catch (Exception e) {
// TODO Auto-generated catch block
}
}
});
}
};
private boolean prepareMediaRecorder(){
myCamera = getCameraInstance();
mediaRecorder = new MediaRecorder();
myCamera.unlock();
mediaRecorder.setCamera(myCamera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);
mediaRecorder.setOutputFile(fileUri.getPath());
//mediaRecorder.setOutputFile("/sdcard/myvideo1.mp4");
mediaRecorder.setMaxDuration(10000); // Set max duration 60 sec.
mediaRecorder.setMaxFileSize(50000000); // Set max file size 50M
mediaRecorder.setPreviewDisplay(cameraSurfaceView.getHolder().getSurface());
try {
mediaRecorder.prepare();
} catch (IllegalStateException e) {
releaseMediaRecorder();
return false;
} catch (IOException e) {
releaseMediaRecorder();
return false;
}
return true;
}
@Override
protected void onPause() {
super.onPause();
releaseMediaRecorder(); // if you are using MediaRecorder, release it first
releaseCamera(); // release the camera immediately on pause event
}
private void releaseMediaRecorder(){
if (mediaRecorder != null) {
mediaRecorder.reset(); // clear recorder configuration
mediaRecorder.release(); // release the recorder object
mediaRecorder = new MediaRecorder();
myCamera.lock(); // lock camera for later use
}
}
private void releaseCamera(){
if (myCamera != null){
myCamera.release(); // release the camera for other applications
myCamera = null;
}
}
public class CameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback{
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraSurfaceView(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int weight,
int height) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (mHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
// make any resize, rotate or reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
// The Surface has been created, now tell the camera where to draw the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
public Uri getOutputMediaFileUri(int type) {
return Uri.fromFile(getOutputMediaFile(type));
}
/**
* returning image / video
*/
private static File getOutputMediaFile(int type) {
// External sdcard location
File mediaStorageDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
Config.IMAGE_DIRECTORY_NAME);
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d(TAG, "Oops! Failed create "
+ Config.IMAGE_DIRECTORY_NAME + " directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator
+ "VID_" + timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
}