How to take a screenshot and share it programmatically

I am making an application in Android in which I have to take screenshot of one of my activities and mail it as attachment.

I want to take screenshot of the current page and then share it via email, Bluetooth, Twitter or Facebook.

My code is as follows:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  MenuInflater inflater = getMenuInflater();
  inflater.inflate(R.menu.menuselected1, menu);
  return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

  switch (item.getItemId()) {
    case R.id.ScreenShot:

    try {
        takeScreenShot(this);
    }
    catch (Exception e) {
        System.out.println(e);
    }

    return true;

    default:
    return super.onOptionsItemSelected(item);
  }
}

private static void savePic(Bitmap b, String strFileName) {
  FileOutputStream fos = null;
  try {
      fos = new FileOutputStream(strFileName);
      if (null != fos) {
        b.compress(Bitmap.CompressFormat.PNG, 90, fos);
        System.out.println("b is:"+b);
        fos.flush();
        fos.close();
      }
  } catch (FileNotFoundException e) {
          e.printStackTrace();
  } catch (IOException e) {
          e.printStackTrace();
  }
}

public static void shoot(Activity a,String b) {
  //savePic(takeScreenShot(a), "sdcard/xx.png");
  savePic(takeScreenShot(a), b);
}

private static Bitmap takeScreenShot(Activity activity) {
  View view = activity.getWindow().getDecorView();
  view.setDrawingCacheEnabled(true);
  view.buildDrawingCache();
  Bitmap b1 = view.getDrawingCache();
  Rect frame = new Rect();
  activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
  int statusBarHeight = frame.top;
  int width = activity.getWindowManager().getDefaultDisplay().getWidth();
  int height = activity.getWindowManager().getDefaultDisplay()
               .getHeight();

  // Bitmap b = Bitmap.createBitmap(b1, 0, 25, 320, 455);
  Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height
                                 - statusBarHeight);
  view.destroyDrawingCache();
  return b;
}

Try this for taking screenshot of current Activity:

Android 2.2 :

private static Bitmap takeScreenShot(Activity activity)
{
    View view = activity.getWindow().getDecorView();
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    Bitmap b1 = view.getDrawingCache();
    Rect frame = new Rect();
    activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
    int statusBarHeight = frame.top;

    DisplayMetrics displaymetrics = new DisplayMetrics(); 
    mContext.getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);

    int width = displaymetrics.widthPixels;
    int height = displaymetrics.heightPixels;

    Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height  - statusBarHeight);
    view.destroyDrawingCache();
    return b;
}
private static void savePic(Bitmap b, String strFileName)
{
    FileOutputStream fos = null;
    try
    {
        fos = new FileOutputStream(strFileName);
        if (null != fos)
        {
            b.compress(Bitmap.CompressFormat.PNG, 90, fos);
            fos.flush();
            fos.close();
        }
    }
    catch (FileNotFoundException e)
    {
        e.printStackTrace();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
}

If by "screenshot of current page" you mean "screenshot of one of my activities", you can arrange to render your Views to a bitmap-backed Canvas, then save an image from the bitmap.

If by "screenshot of current page" you mean "screenshot of somebody else's activity", that is not supported by the Android SDK, for obvious privacy and security reasons. There are various techniques that rooted device users can use to take screenshots.

1. Create the share button

I wanted mine in the action bar so I created a share_menu.xml file:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/share_item"
        app:showAsAction="always|withText"
        android:title="Share"
        android:icon="@drawable/share_icon"
        android:actionProviderClass=
            "android.widget.ShareActionProvider" />
</menu>

This adds a button in the action bar with my share_icon and the text.

2. Add the sharing menu to your activity (or fragment)

I did this inside a fragment so I added the code below to my fragment file. If you are inside an activity then you override public boolean onCreateOptionsMenu(Menu menu) instead.

@Override
public void onCreateOptionsMenu(
        Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.share_menu, menu);
}

if you are doing this with a fragment then in onCreate() you have to add:

setHasOptionsMenu(true);

3. Set up button action/callback/onclick

This is what is going to kick off the sharing.

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.share_item){
            Bitmap bm = screenShot(this.getView());
            File file = saveBitmap(bm, "mantis_image.png");
            Log.i("chase", "filepath: "+file.getAbsolutePath());
            Uri uri = Uri.fromFile(new File(file.getAbsolutePath()));
            Intent shareIntent = new Intent();
            shareIntent.setAction(Intent.ACTION_SEND);
            shareIntent.putExtra(Intent.EXTRA_TEXT, "Check out my app.");
            shareIntent.putExtra(Intent.EXTRA_STREAM, uri);
            shareIntent.setType("image/*");
            shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            startActivity(Intent.createChooser(shareIntent, "share via"));
        }
        return super.onOptionsItemSelected(item);
    }

Notice this calls two magic methods:

screenShot():

private Bitmap screenShot(View view) {
    Bitmap bitmap = Bitmap.createBitmap(view.getWidth(),view.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    view.draw(canvas);
    return bitmap;
}

private static File saveBitmap(Bitmap bm, String fileName){
    final String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Screenshots";
    File dir = new File(path);
    if(!dir.exists())
        dir.mkdirs();
    File file = new File(dir, fileName);
    try {
        FileOutputStream fOut = new FileOutputStream(file);
        bm.compress(Bitmap.CompressFormat.PNG, 90, fOut);
        fOut.flush();
        fOut.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return file;
}

Important

To your AndroidManifest.xml, you have to add:

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

or the screenshot won't be saved, and gmail will think you are trying to attach an empty file.

Also, a lot of SO answers say to use "*/*" for shareIntent.setType() but this creates an issue with facebook sharing, so it's best to leave it as "image/*".