HY, 我想清空内部文件夹" / storage / emulated / 0 / DCIM / Camera" 这适用于我使用以下代码
public void emptyDir()
{
File dir = new File("/storage/emulated/0/DCIM/Camera");
if (dir.isDirectory())
{
String[] children = dir.list();
for (int i = 0; i < children.length; i++)
{
new File(dir, children[i]).delete();
Log.i(logTag,"Path " +dir +" cleared");
}
}
}
我可以在没有硬编码的情况下访问/读取此路径吗?
捕获我的图片的代码: 我认为大部分代码都非常清楚我打算做什么,因为我总是试着评论我做的任何事情,即使我只是测试一些新东西。我希望我可以展示我用这个创造的东西。
public void takePhoto()
{
//Set the size of the Picture
Parameters params = mCamera.getParameters();
params.setPictureSize(640, 480);
mCamera.setParameters(params);
//Befehl um die möglichen Auflösungen auszuwählen/aufzulisten
//List<Camera.Size> sizes = params.getSupportedPictureSizes();
//Take the Picture
mCamera.takePicture(null, null, mPicture);
//SLEEP "sleeper value" SECONDS HERE ...
Handler handler = new Handler();
handler.postDelayed(new Runnable()
{
public void run()
{
releaseCamera();
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.removeAllViews();
activateCamera();
}
}, sleeper);
}
/**
* Creates and Instance of Camera and adds CameraView to
* camera_preview FrameLayout
*/
public void activateCamera()
{
// Create an instance of Camera
mCamera = getCameraInstance();
// Create our Preview view and set it as the content of our activity.
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mPreview);
}
final PictureCallback mPicture = new PictureCallback()
{
public void onPictureTaken(byte[] data, Camera camera)
{
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null)
{
return;
}
try
{
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
path = pictureFile.getAbsolutePath();
System.out.println("Picture stored at: "+path);
MediaStore.Images.Media.insertImage(getContentResolver(), pictureFile.getAbsolutePath(), pictureFile.getName(), pictureFile.getName());
}
catch (FileNotFoundException e)
{
}
catch (IOException e)
{
}
}
};
/** A safe way to get an instance of the Camera object. */
public static Camera getCameraInstance(){
Camera c = null;
try
{
c = Camera.open(); // attempt to get a Camera instance
}
catch (Exception e)
{
System.out.println("Camera in use");
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
@Override
protected void onPause()
{
super.onPause();
releaseCamera(); // release the camera immediately on pause event
}
private void releaseCamera()
{
if (mCamera != null)
{
mCamera.release(); // release the camera for other applications
mCamera = null;
}
}
/** Create a File for saving an image or video */
private File getOutputMediaFile(int type)
{
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
//File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MFI Webcam");
File rootsd = Environment.getExternalStorageDirectory();
File mediaStorageDir = new File(rootsd.getAbsolutePath() + "/MFI Webcam");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists())
{
if (! mediaStorageDir.mkdirs())
{
return null;
}
}
// Create a media file name
File mediaFile;
if (type == MEDIA_TYPE_IMAGE)
{
mediaFile = new File(mediaStorageDir.getPath() + File.separator + "webcam"+ ".jpg");
} else
{
return null;
}
return mediaFile;
}
答案 0 :(得分:1)
使用getExternalStoragePublicDirectory(DIRECTORY_DCIM)
,您可能会获得/storage/emulated/0/DCIM
。但它永远不能保证图片会在那里。他们也可以在/storage/emulated/1/DCIM
。所以最好让用户指出正确的目录。