How to take a screenshot of current Activity and then share it?

This is how I captured the screen and shared it.

First, get root view from current activity:

View rootView = getWindow().getDecorView().findViewById(android.R.id.content);

Second, capture the root view:

 public static Bitmap getScreenShot(View view) {
       View screenView = view.getRootView();
       screenView.setDrawingCacheEnabled(true);
       Bitmap bitmap = Bitmap.createBitmap(screenView.getDrawingCache());
       screenView.setDrawingCacheEnabled(false);
       return bitmap;
 }

Third, store the Bitmap into the SDCard:

public static void store(Bitmap bm, String fileName){
    final static String dirPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Screenshots";
    File dir = new File(dirPath);
    if(!dir.exists())
        dir.mkdirs();
    File file = new File(dirPath, fileName);
    try {
        FileOutputStream fOut = new FileOutputStream(file);
        bm.compress(Bitmap.CompressFormat.PNG, 85, fOut);
        fOut.flush();
        fOut.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

At last, share the screenshot of current Activity:

private void shareImage(File file){
    Uri uri = Uri.fromFile(file);
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_SEND);
    intent.setType("image/*");

    intent.putExtra(android.content.Intent.EXTRA_SUBJECT, "");
    intent.putExtra(android.content.Intent.EXTRA_TEXT, "");
    intent.putExtra(Intent.EXTRA_STREAM, uri);
    try {
        startActivity(Intent.createChooser(intent, "Share Screenshot"));
    } catch (ActivityNotFoundException e) {
        Toast.makeText(context, "No App Available", Toast.LENGTH_SHORT).show();
    }
}

I hope you will be inspired by my codes.

UPDATE:

Add below permissions into your AndroidManifest.xml:

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

Because it creates and accesses files in external storage.

UPDATE:

Starting from Android 7.0 Nougat sharing file links are forbiden. To deal with this you have to implement FileProvider and share "content://" uri not "file://" uri.

Here is a good description how to do it.

create share button with click on listener

    share = (Button)findViewById(R.id.share);
    share.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Bitmap bitmap = takeScreenshot();
            saveBitmap(bitmap);
            shareIt();
        }
    });

Add two methods

    public Bitmap takeScreenshot() {
    View rootView = findViewById(android.R.id.content).getRootView();
    rootView.setDrawingCacheEnabled(true);
    return rootView.getDrawingCache();
    }

public void saveBitmap(Bitmap bitmap) {
    imagePath = new File(Environment.getExternalStorageDirectory() + "/screenshot.png");
    FileOutputStream fos;
    try {
        fos = new FileOutputStream(imagePath);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
        fos.flush();
        fos.close();
    } catch (FileNotFoundException e) {
        Log.e("GREC", e.getMessage(), e);
    } catch (IOException e) {
        Log.e("GREC", e.getMessage(), e);
    }
}

Share screen shot. sharing implementation here

    private void shareIt() {
    Uri uri = Uri.fromFile(imagePath);
    Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
    sharingIntent.setType("image/*");
    String shareBody = "In Tweecher, My highest score with screen shot";
    sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "My Tweecher score");
    sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
    sharingIntent.putExtra(Intent.EXTRA_STREAM, uri);

    startActivity(Intent.createChooser(sharingIntent, "Share via"));
    }

You can the below code to get the bitmap for the view you are seeing on screen You can specify which view to create bitmap.

    public static Bitmap getScreenShot(View view) {
           View screenView = view.getRootView();
           screenView.setDrawingCacheEnabled(true);
           Bitmap bitmap = Bitmap.createBitmap(screenView.getDrawingCache());
           screenView.setDrawingCacheEnabled(false);
           return bitmap;
     }