我正在开发一个允许用户捕捉视频的相机应用程序，我开始关注一些教程。 但问题是当我按下Capture视频按钮开始录制时，预览就会被拉伸 Before
这是我的代码：
package com.example.phuongnguyen.cameraz;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Rect;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class MainActivity extends Activity implements SurfaceHolder.Callback {
Camera mCamera;
Button btnCapture;
Button btnSwitch;
Button btnRecord;
SurfaceHolder surfaceHolder;
int cameraID;
private PreviewSurfaceView mOpenCvCameraView;
private DrawingView drawingView;
static MediaRecorder mediaRecorder;
boolean recording;
String RECORD = "Record \nvideo";
String STOP_RECORD = "Stop";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createImageGallary();
btnCapture = (Button) findViewById(R.id.captureImage);
btnSwitch = (Button) findViewById(R.id.button_switch);
btnRecord = (Button) findViewById(R.id.button_record);
mOpenCvCameraView = (PreviewSurfaceView) findViewById(R.id.surfaceView);
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraView.setListener(this);
drawingView = (DrawingView) findViewById(R.id.drawing_view);
mOpenCvCameraView.setDrawingView(drawingView);
surfaceHolder = mOpenCvCameraView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
btnCapture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
captureImage();
}
});
btnSwitch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
switchCamera();
}
});
mediaRecorder = new MediaRecorder();
recording = false;
//initMediaRecorder();
btnRecord.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(recording){
mediaRecorder.stop();
releaseMediaRecorder();
btnRecord.setText(RECORD);
recording = false;
//finish();
}else{
//refreshCamera();
//MediaRecorder test = mediaRecorder;
try {
initMediaRecorder();
mediaRecorder.start();
} catch (Exception e) {
e.printStackTrace();
}
recording = true;
btnRecord.setText(STOP_RECORD);
}
}
});
}
private void initMediaRecorder(){
//mediaRecorder.setVideoSize(mOpenCvCameraView.getWidth(), mOpenCvCameraView.getHeight());
mCamera.unlock();
mediaRecorder.setCamera(mCamera);
//mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
CamcorderProfile camcorderProfile_HQ = CamcorderProfile.get(cameraID, CamcorderProfile.QUALITY_HIGH);
mediaRecorder.setProfile(camcorderProfile_HQ);
//mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
//mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setOutputFile("/sdcard/myvideo.mp4");
mediaRecorder.setMaxDuration(5000); // Set max duration 5 sec.
mediaRecorder.setMaxFileSize(5000000); // Set max file size 5M
if(cameraID == Camera.CameraInfo.CAMERA_FACING_BACK){
mediaRecorder.setOrientationHint(90);
}else{
mediaRecorder.setOrientationHint(270);
}
try {
mediaRecorder.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void prepareMediaRecorder(){
mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
try {
mediaRecorder.prepare();
} catch (IllegalStateException e) {
releaseMediaRecorder();
//e.printStackTrace();
} catch (IOException e) {
releaseMediaRecorder();
//e.printStackTrace();
}
}
private void releaseMediaRecorder() {
if (mediaRecorder != null) {
mediaRecorder.reset(); // clear recorder configuration
mediaRecorder.release(); // release the recorder object
mediaRecorder = null;
//mCamera.lock(); // lock camera for later use
}
}
private String GALLARY_LOCATION_NAME = "Camera Z";
File galleryFolder;
private void createImageGallary(){
File storageDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
galleryFolder = new File(storageDirectory,GALLARY_LOCATION_NAME);
if (!galleryFolder.exists()){
galleryFolder.mkdirs();
}
}
private String imagePath(File imageFile){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyymmddhhmmss");
String date = simpleDateFormat.format(new Date());
String photo = "CameraZ_"+date+".jpg";
String file_name = imageFile.getAbsolutePath()+"/"+photo;
return file_name;
}
Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
new BitmapAsyncTask(getApplicationContext(), imagePath(galleryFolder), cameraID, data).execute();
//Toast.makeText(getApplicationContext(), "Picture saved : "+imagePath(gallaryFolder), Toast.LENGTH_SHORT).show();
refreshCamera();
//refreshGallery(photoFile);
}
};
AutoFocusCallback autoFocusCallback = new AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
btnCapture.setEnabled(true);
}
};
@Override
protected void onResume() {
super.onResume();
refreshCamera();
}
@Override
protected void onPause() {
super.onPause();
if(mOpenCvCameraView != null){
releaseCamera();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(mOpenCvCameraView != null){
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
cameraID = Camera.CameraInfo.CAMERA_FACING_BACK;
}catch (RuntimeException e){
e.printStackTrace();
}
mediaRecorder.setPreviewDisplay(holder.getSurface());
Camera.Parameters parameter = mCamera.getParameters();
parameter.setPreviewFrameRate(20);
parameter.setPreviewSize(mOpenCvCameraView.getWidth(), mOpenCvCameraView.getHeight());
mCamera.setParameters(parameter);
mCamera.setDisplayOrientation(90);
try{
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
}catch (Exception e){
}
//prepareMediaRecorder();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
refreshCamera();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
releaseCamera();
}
public void switchCamera(){
mCamera.stopPreview();
mCamera.release();
if(cameraID == Camera.CameraInfo.CAMERA_FACING_BACK){
cameraID = Camera.CameraInfo.CAMERA_FACING_FRONT;
}else{
cameraID = Camera.CameraInfo.CAMERA_FACING_BACK;
}
try {
mCamera = Camera.open(cameraID);
}catch (RuntimeException e){
}
Camera.Parameters parameter = mCamera.getParameters();
parameter.setPreviewFrameRate(20);
parameter.setPreviewSize(mOpenCvCameraView.getWidth(), mOpenCvCameraView.getHeight());
mCamera.setParameters(parameter);
mCamera.setDisplayOrientation(90);
try{
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
}catch (Exception e){
}
}
public void captureImage(){
mCamera.takePicture(null, null, pictureCallback);
}
public void refreshGallery( File file){
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intent.setData(Uri.fromFile(file));
sendBroadcast(intent);
}
public void refreshCamera(){
if(surfaceHolder.getSurface()== null){
return;
}
try{
mCamera.stopPreview();
}catch (Exception e){
}
try{
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
}catch (Exception e){
}
}
public void releaseCamera() {
if (mCamera != null) {
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
}
}
public void doTouchFocus(final Rect tfocusRect) {
try {
final List<Camera.Area> focusList = new ArrayList<Camera.Area>();
Camera.Area focusArea = new Camera.Area(tfocusRect, 1000);
focusList.add(focusArea);
Camera.Parameters para = mCamera.getParameters();
para.setFocusAreas(focusList);
para.setMeteringAreas(focusList);
mCamera.setParameters(para);
mCamera.autoFocus(autoFocusCallback);
} catch (Exception e) {
e.printStackTrace();
}
}
}