Stretching camera preview to full screen in android

Question

I am using this camera preview application for my Android app.

I want the camera preview over the full screen.Hence I used the example from Android APIs to try setting the preview to full screen. This is how I am trying to do it:

if (!cameraConfigured) {
    Camera.Parameters parameters=camera.getParameters();
    Camera.Size size = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
    if (size != null) {
        parameters.setPreviewSize(size.width, size.height);

      camera.setParameters(parameters);
      cameraConfigured=true;
    }

I am using relative layout as my layout. My layout settings are follows:

<android.view.SurfaceView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/preview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>

I am still not able to preview my camera over the entire screen. I would like to know how to preview over the entire screen.

score 3 · Accepted Answer · answered Jul 04 '12 at 05:11

3

I found the problem. I added the following setting to Android Manifest file

<supports-screens android:largeScreens="true"
                    android:normalScreens="true"
                    android:smallScreens="true" android:xlargeScreens="true"/>

I am able to view the camera over full screen.

answered Jul 04 '12 at 05:11

Sai

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Hi, do you have also the problem that in full screen the camera preview image is skewed / stretched in order to fit on the screen? http://stackoverflow.com/questions/16727836/camera-display-preview-in-full-screen-does-not-maintain-aspect-ratio-image-i Thanks – Paul May 24 '13 at 15:05

score 0 · Answer 2 · answered Jul 04 '12 at 03:49

Im assuming your code is within a class that extends SurfaceView and that you will place the surfaceView inside a FrameLayout that is as large as the display.

What you are not doing in your code is setting your SurfaceView to be the same size as the display which in the following code block is done by getting the layout, and setting the width and height.

I use the following code to stretch to the dimensions of the screen:

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {

    ...

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

      ...

      final DisplayMetrics dm = this.getResources().getDisplayMetrics();
      Camera.Parameters parameters = mCamera.getParameters();
      parameters.setPreviewSize(cameraSize.width, cameraSize.height);
      mCamera.setParameters(parameters);
      //Here you get the SurfaceView layout and subsequently set its width and height
      FrameLayout.LayoutParams frameParams = (FrameLayout.LayoutParams) this.getLayoutParams();
      frameParams.width = LayoutParams.MATCH_PARENT;// dm.widthPixels should also work
      frameParams.height = LayoutParams.MATCH_PARENT;//dm.heightPixels should also work
      this.setLayoutParams(frameParams);
      //And we should have things set now...

      ....

    }

    ...
}

I hope this helps. The key parts to integrate are between those inner comments

Hi, do you have also the problem that in full screen the camera preview image is skewed / stretched in order to fit on the screen? stackoverflow.com/questions/16727836/… Thanks — Paul, May 27 '13 at 08:46

score 0 · Answer 3 · answered Mar 13 '18 at 08:06

Get dimensions of the screen

DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;

use this width and height to get preview size.

score -1 · Answer 4 · answered Jul 02 '12 at 03:16

First, get the display width and height:

   int dw = currentDisplay.getWidth();    // dw == display width
   int dh = currentDisplay.getHeight();   // dh == display height

Then loop through the supported preview sizes, and pick the largest one where, if (size.width <= dw && size.height <= dh). When you hit one where this if statement fails, use the previous values (you could set something like prevWidth and prevHeight as a quick/easy way to step back one ... just remember to set each of those AFTER you test them; after you hit a preview size that's larger than screen size, just break out of the loop.

Later,
--jim

Stretching camera preview to full screen in android

4 Answers4