Android音视频之视频采集 Android音视频之视频采集（系统API预览）（如何采集视频的音频）

<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />

<uses-permission android:name="android.permission.RECORD_AUDIO" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
...
<!-- Needed only if your app targets Android 5.0 (API level 21) or higher. -->
<uses-feature android:name="android.hardware.location.gps" />

<manifest ... >
 <uses-feature android:name="android.hardware.camera"
     android:required="true" />
 ...
</manifest>

static final int REQUEST_IMAGE_CAPTURE = 1;

private void dispatchTakePictureIntent() {
 Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
 if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
  startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
 }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
  Bundle extras = data.getExtras();
  Bitmap imageBitmap = (Bitmap) extras.get("data");
  mImageView.setImageBitmap(imageBitmap);
 }
}

<manifest ...>
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 ...
</manifest>

static final int REQUEST_TAKE_PHOTO = 1;

private void dispatchTakePictureIntent() {
 Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
 // Ensure that there's a camera activity to handle the intent
 if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
  // Create the File where the photo should go
  File photoFile = null;
  try {
   photoFile = createImageFile();
  } catch (IOException ex) {
   // Error occurred while creating the File
   ...
  }
  // Continue only if the File was successfully created
  if (photoFile != null) {
   Uri photoURI = FileProvider.getUriForFile(this,
             "com.example.android.fileprovider",
             photoFile);
   takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
   startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
  }
 }
}

String mCurrentPhotoPath;

private File createImageFile() throws IOException {
 // Create an image file name
 String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
 String imageFileName = "JPEG_" + timeStamp + "_";
 File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
 File image = File.createTempFile(
  imageFileName, /* prefix */
  ".jpg",   /* suffix */
  storageDir  /* directory */
 );

 // Save a file: path for use with ACTION_VIEW intents
 mCurrentPhotoPath = image.getAbsolutePath();
 return image;
}

<application>
 ...
 <provider
  android:name="android.support.v4.content.FileProvider"
  android:authorities="com.example.android.fileprovider"
  android:exported="false"
  android:grantUriPermissions="true">
  <meta-data
   android:name="android.support.FILE_PROVIDER_PATHS"
   android:resource="@xml/file_paths"></meta-data>
 </provider>
 ...
</application>

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
 <external-path name="my_images" path="Android/data/com.example.package.name/files/Pictures" />
</paths>

private void galleryAddPic() {
  Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
  File f = new File(mCurrentPhotoPath);
  try {
   MediaStore.Images.Media.insertImage(getContentResolver(),
     f.getAbsolutePath(), f.getName(), null);
   Log.d(TAG, "galleryAddPic: add to Media Scanner success");
  } catch (FileNotFoundException e) {
   e.printStackTrace();
   Log.e(TAG, "galleryAddPic: add to Media Scanner failed");
  }

  Uri contentUri = Uri.fromFile(f);
  mediaScanIntent.setData(contentUri);
  this.sendBroadcast(mediaScanIntent);
  Toast.makeText(this, "Add to Gallery success", Toast.LENGTH_SHORT).show();
 }

private void setPic() {
 // Get the dimensions of the View
 int targetW = mImageView.getWidth();
 int targetH = mImageView.getHeight();

 // Get the dimensions of the bitmap
 BitmapFactory.Options bmOptions = new BitmapFactory.Options();
 bmOptions.inJustDecodeBounds = true;
 BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
 int photoW = bmOptions.outWidth;
 int photoH = bmOptions.outHeight;

 // Determine how much to scale down the image
 int scaleFactor = Math.min(photoW/targetW, photoH/targetH);

 // Decode the image file into a Bitmap sized to fill the View
 bmOptions.inJustDecodeBounds = false;
 bmOptions.inSampleSize = scaleFactor;
 bmOptions.inPurgeable = true;

 Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
 mImageView.setImageBitmap(bitmap);
}

static final int REQUEST_VIDEO_CAPTURE = 1;

private void dispatchTakeVideoIntent() {
 Intent takeVideoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
 if (takeVideoIntent.resolveActivity(getPackageManager()) != null) {
  startActivityForResult(takeVideoIntent, REQUEST_VIDEO_CAPTURE);
 }
}

@Override
 protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
  if (requestCode == REQUEST_VIDEO_CAPTURE && resultCode == RESULT_OK) {
   Uri videoUri = intent.getData();
   Log.d(TAG, "onActivityResult: " + videoUri);
   mVideoView.setVideoURI(videoUri);
   mVideoView.requestFocus();
   mVideoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

    @Override
    public void onPrepared(MediaPlayer mp) {
     mp.setLooping(false);//设置视频重复播放
    }
   });
   mVideoView.start();//播放视频
   MediaController mediaController = new MediaController(this);//显示控制条
   mVideoView.setMediaController(mediaController);
   mediaController.setMediaPlayer(mVideoView);//设置控制的对象
   mediaController.show();
  }
 }