我使用mediarecorder在Android应用程序中录制视频。我将开始和停止多次录制视频我将开始在Action_down上录制并停止在Action_up上这很顺利，我可以在移动设备中存储和播放视频文件。 我的问题是，因为我必须多次启动和停止录制视频我不能使用单个输出文件因为每次它都会越过写入所以每次我传递新的文件名和iam每次都将其附加到一个outputfile.iam每个人移动文件和最终输出文件，但最终文件只有我第一次记录的内容，因为从第二个标签看如果看到file.mp4.length（）为零为什么呢？有人请尽力帮助我。我的代码如下
package com.example.longtouch;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.net.rtp.AudioGroup;
import android.net.rtp.AudioStream;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Handler.Callback;
import android.provider.MediaStore.Audio;
import android.provider.MediaStore.Files;
import android.provider.MediaStore.Video;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;
import android.support.v4.app.NavUtils;
public class MainActivity extends Activity implements OnTouchListener{
int i=1;
File outputFile;
File f1;
File f2;
MediaRecorder mediaRecorder;
ThreadProgress mThreadProgress;
ThreadProgress2 mThreadProgress2;
public int eventAction;
Handler handler;
Handler mHandler;
Button myButton;
FrameLayout myCameraPreview;
Button submit;
Button submit1;
LinearLayout ll;
ProgressBar progressBar;
int progressStatus=0;
MyCameraSurfaceView myCameraSurfaceView;
Camera myCamera;
boolean recording;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recording=false;
myButton=(Button)findViewById(R.id.button_capture);
submit=(Button)findViewById(R.id.submit);
submit1=(Button)findViewById(R.id.submit1);
progressBar=(ProgressBar)findViewById(R.id.progress_bar);
progressBar.setMax(10000);
myCamera = getCameraInstance();
if(myCamera == null){
Toast.makeText(MainActivity.this,
"Fail to get Camera",
Toast.LENGTH_LONG).show();
}
// else
// myCamera.unlock();
myCameraSurfaceView = new MyCameraSurfaceView(this, myCamera);
myCameraPreview=(FrameLayout)findViewById(R.id.camera_preview);
myCameraPreview.addView(myCameraSurfaceView);
ll=(LinearLayout)findViewById(R.id.ll);
myCameraPreview.setOnTouchListener(this);
outputFile=new File("/sdcard/myvideo.mp4");
if(outputFile.exists()){
outputFile.delete();
outputFile=new File("/sdcard/myvideo.mp4");
try {
outputFile.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else{
try {
outputFile.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
f1=new File("/sdcard/myvideo1.mp4");
if(f1.exists()){
f1.delete();
f1=new File("/sdcard/myvideo1.mp4");
try{
f1.createNewFile();
}
catch(Exception e){
e.printStackTrace();
}
}
else{
try{
f1.createNewFile();
}
catch(Exception e){
e.printStackTrace();
}
}
f2=new File("/sdcard/myvideo2.mp4");
if(f2.exists()){
f2.delete();
f2=new File("/sdcard/myvideo2.mp4");
try{
f2.createNewFile();
}
catch(Exception e){
e.printStackTrace();
}
}
else{
try{
f2.createNewFile();
}
catch(Exception e){
e.printStackTrace();
}
}
}
/* public int getFrontCameraId() {
CameraInfo ci = new CameraInfo();
for (int i = 0 ; i < Camera.getNumberOfCameras(); i++) {
Camera.getCameraInfo(i, ci);
if (ci.facing == CameraInfo.CAMERA_FACING_FRONT) return i;
}
return -1; // No front-facing camera found
}*/
private Camera getCameraInstance(){
// TODO Auto-generated method stub
Camera c = null;
try {
/* int index = getFrontCameraId();
if (index != -1)
c = Camera.open(index);*/
c = Camera.open(); // attempt to get a Camera instance
}
catch (Exception e){
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
public void submit(View v){
// stop recording and release camera
// mediaRecorder.stop(); // stop the recording
// releaseMediaRecorder(); // release the MediaRecorder object
Log.d("outputFile",""+f1.length());
progressStatus=progressBar.getProgress();
//Exit after saved
// finish();
myButton.setText("capture");
recording=false;
submit.setVisibility(View.GONE);
}
public void submit1(View v){
// stop recording and release camera
// mediaRecorder.stop(); // stop the recording
// releaseMediaRecorder(); // release the MediaRecorder object
progressBar.setProgress(0);
progressStatus=0;
//Exit after saved
// finish();
myButton.setText("capture");
recording=false;
submit1.setVisibility(View.GONE);
}
public void display(View v){
Intent i=new Intent(this,VideoPlayer.class);
startActivity(i);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
public boolean onTouch(View arg0, final MotionEvent event) {
// TODO Auto-generated method stub
eventAction=event.getAction();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
{
i=i+1;
Toast.makeText(getApplicationContext(),"action_down",Toast.LENGTH_SHORT).show();
//releaseCamera();
if(!prepareMediaRecorder()){
Toast.makeText(MainActivity.this,
"Fail in prepareMediaRecorder()!\n - Ended -",Toast.LENGTH_LONG).show();
finish();
}
progressBar.setProgress(progressStatus);
myButton.setText("STOP");
try{
mediaRecorder.start();
}
catch(Exception e){
e.printStackTrace();
Log.d("vd","exception at start method");
}
if(f1.exists()){
long l=f1.length();
Log.d("start","started"+l);
}
if(f2.exists()){
long m=f2.length();
Log.d("start","started"+m);
}
recording = true;
if(progressBar.getProgress()>=5000){
mThreadProgress2=new ThreadProgress2();
mThreadProgress2.start();
}
mHandler = new Handler(new Callback() {
public boolean handleMessage(final Message msg) {
runOnUiThread(new Runnable() {
public void run() {
if( event.getAction()!=MotionEvent.ACTION_UP){
progressBar.setProgress(msg.arg1);
}
if(progressBar.getProgress()==10000){
Log.d("unicorn","1000");
submit1.setVisibility(View.VISIBLE);
}
}
});
return false;
}
});
mThreadProgress=new ThreadProgress();
mThreadProgress.start();
handler = new Handler(new Callback() {
public boolean handleMessage(final Message msg) {
runOnUiThread(new Runnable() {
public void run() {
if( event.getAction()!=MotionEvent.ACTION_UP)
progressBar.setProgress(msg.arg1);
if(progressBar.getProgress()==5000){
submit.setVisibility(View.VISIBLE);
}
}
});
return false;
}
});
return true;
}
case MotionEvent.ACTION_UP:
{ // nothing to do
Toast.makeText(getApplicationContext(),"action_up",Toast.LENGTH_SHORT).show();
myButton.setText("capture");
mediaRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
try {
myCamera.reconnect();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//Exit after saved
// finish();
recording=false;
progressStatus=progressBar.getProgress();
if(i%2==0){
long len=f1.length();
Log.d("length",""+f1.getPath()+len);
Combine1 c1=new Combine1();
c1.start();
}
else{
long len=f2.length();
Log.d("length",""+f2.getPath()+len);
Combine2 c2=new Combine2();
c2.start();
}
break;
}
default:
return false;
}
return true;
}
private boolean prepareMediaRecorder(){
// myCamera = getCameraInstance();
mediaRecorder = new MediaRecorder();
myCamera.stopPreview();
myCamera.unlock();
mediaRecorder.setCamera(myCamera);
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
// mediaRecorder.setVideoSize(400,400);
if(i%2==0){
Log.d("outputfile",""+f1.getPath()+f1.length());
mediaRecorder.setOutputFile(f1.getPath());
Log.d("outputfile",""+f1.getPath()+f1.length());
}
else{
Log.d("outputfile",""+f2.getPath()+f2.length());
mediaRecorder.setOutputFile(f2.getPath());
Log.d("outputfile",""+f2.getPath()+f2.length());
}
mediaRecorder.setMaxDuration(10000); // Set max duration 10 sec.
mediaRecorder.setMaxFileSize(5000000); // Set max file size 5M
// mediaRecorder.setOnInfoListener(this);
mediaRecorder.setPreviewDisplay(myCameraSurfaceView.getHolder().getSurface());
try {
mediaRecorder.prepare();
} catch (IllegalStateException e) {
Log.d("prepare","illegalstateexception");
e.printStackTrace();
releaseMediaRecorder();
Toast.makeText(getApplicationContext(),"illegal state exception",Toast.LENGTH_SHORT).show();
return false;
} catch (IOException e) {
Log.d("prepare","ioexception");
e.printStackTrace();
releaseMediaRecorder();
Toast.makeText(getApplicationContext(),"IOexception",Toast.LENGTH_SHORT).show();
return false;
}
Log.d("after prepare","after prepare f1"+f1.length());
Log.d("after prepare","after prepare f2"+f2.length());
return true;
}
public void combine(String file){
Log.d("combine","combining"+file);
try{
File inputFile=new File(file);
FileInputStream fis=new FileInputStream(inputFile);
long inputlen=inputFile.length();
Log.d("combine","lengthbefore write"+inputlen);
File outputFile = new File("/sdcard/myvideo.mp4");
FileOutputStream fos = new FileOutputStream(outputFile,true);
byte fileContent[]= new byte[(int)inputFile.length()];
fis.read(fileContent);
long len=outputFile.length();
Log.d("combine","lenth"+len);
fos.write(fileContent);
fis.close();
fos.close();
inputlen=inputFile.length();
len=outputFile.length();
Log.d("combine","inputlength"+inputlen);
Log.d("combine","lenth"+len);
/* File f= new File(file);
boolean deleted = f.delete();
if(deleted){
Log.d("combine","deleted"+file);
} */
}
catch(Exception e){
e.printStackTrace();
}
}
@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 = null;
// 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 MyCameraSurfaceView extends SurfaceView implements SurfaceHolder.Callback{
private SurfaceHolder mHolder;
private Camera mCamera;
public MyCameraSurfaceView(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);
}
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){
}
}
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) {
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
}
public class ThreadProgress extends Thread implements Runnable {
int progressValue=progressStatus;
public void run() {
while( progressBar.getProgress()<5000 && eventAction!=MotionEvent.ACTION_UP ) {
Log.d("unicorn","in while loop"+progressValue);
progressValue++;
Message message = new Message();
message.arg1 = progressValue;
if(progressValue<=5000 && eventAction!=MotionEvent.ACTION_UP)
handler.sendMessage(message);
}
}
}
public class ThreadProgress2 extends Thread implements Runnable {
int progressValue=progressStatus;
@Override
public void run() {
while( progressBar.getProgress()<10000 && eventAction!=MotionEvent.ACTION_UP ) {
// try{
Log.d("unicorn2","in while loop"+progressValue);
progressValue++;
Message message = new Message();
message.arg1 = progressValue;
if(progressValue<=10000 && eventAction!=MotionEvent.ACTION_UP)
mHandler.sendMessage(message);
//Thread.sleep(1000);
//} catch (InterruptedException e){
// e.printStackTrace();
// break;
// }
}
}
}
public class Combine1 extends Thread implements Runnable{
public void run(){
try{
int c;
FileInputStream fin=new FileInputStream(f1);
FileOutputStream fout=new FileOutputStream(outputFile,true);
long len1=f1.length();
Log.d("length","myvideo1.mp4"+len1);
long len2=outputFile.length();
Log.d("length","myvideo.mp4"+len2);
while((c=fin.read())!=-1){
fout.write(c);
}
len2=outputFile.length();
Log.d("length","myvideo.mp4"+len2);
fin.close();
fout.flush();
fout.close();
}
catch(Exception e){
e.printStackTrace();
}
}
}
public class Combine2 extends Thread implements Runnable{
public void run(){
try{
int j=0;
FileInputStream fin=new FileInputStream(f2);
FileOutputStream fout=new FileOutputStream(outputFile,true);
long len1=f2.length();
Log.d("length","myvideo2.mp4"+len1);
long len2=outputFile.length();
Log.d("length","myvideo.mp4"+len2);
while((j=fin.read())!=-1){
fout.write(j);
}
len2=outputFile.length();
Log.d("length","myvideo.mp4"+len2);
fin.close();
fout.flush();
fout.close();
}
catch(Exception e){
e.printStackTrace();
}
}
}
}
答案 0 :(得分：0)