Get bitmap from layout

Question

I'm trying to inflate a layout and use that to set a bitmap on an image view. Then, I'm adding that imageview to a linear layout and displaying the linear layout. Here's what I've tried:

public class TestActivity extends Activity {
    private static Bitmap bitMap;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LinearLayout l = new LinearLayout(this);

        bitMap = Bitmap.createBitmap(getWindowManager().getDefaultDisplay().getWidth(), 
                getWindowManager().getDefaultDisplay().getHeight(), 
                Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitMap);
        LayoutInflater inflater = LayoutInflater.from(this);
        View v1 = inflater.inflate(R.layout.main, null);
        v1.layout(0, 0, getWindowManager().getDefaultDisplay().getWidth(), 
                getWindowManager().getDefaultDisplay().getHeight());
        v1.draw(canvas);

        ImageView i1 = new ImageView(this);
        i1.setImageBitmap(bitMap);
        i1.setAdjustViewBounds(true);
        i1.setLayoutParams(new FrameLayout.LayoutParams(getWindowManager().getDefaultDisplay().getWidth(), 
                getWindowManager().getDefaultDisplay().getHeight()));

        l.addView(i1);
        setContentView(l);
    }
}

Unfortunately, the bitMap is not being created properly. Is there anything I'm doing wrong?

uh, i don't know how much clearer i can get, considering ive put up all my code here. all i want is to inflate a layout, get a view from it, and use it to get a bitmap. however, my solution is not working. so how do i make this work? — OckhamsRazor, Nov 14 '11 at 10:30

score 28 · Answer 1 · answered Nov 14 '11 at 10:35

28

Convert a layout to Bitmap.

FrameLayout view = (FrameLayout)findViewById(R.id.framelayout);
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bm = view.getDrawingCache();

answered Nov 14 '11 at 10:35

RajaReddy PolamReddy

22,428
19
115
166

2

thanks. however, this gives a nullpointer exception on your second line of code. – OckhamsRazor Nov 14 '11 at 10:44
i had used this in my app. it's working line, see this http://stackoverflow.com/q/7200535/964741 – RajaReddy PolamReddy Nov 14 '11 at 10:45
1

You need to supply the id of the root view of your layout (you shouldn't need to cast it). Polam's root view is a FrameLayout with android:id="@+id/framelayout" – FunkTheMonk Nov 14 '11 at 10:54
My app FC when I use this in on create(); – Si8 Feb 01 '14 at 16:36
1

You don't need to call "buildDrawingCache();" since "getDrawingCache();" is doing it already. – Joan Jun 18 '14 at 09:19
I am trying to convert layout to bitmap. it's working but listview is not displaying in bitmap. – Dev Tamil Apr 15 '16 at 13:54
How to create bitmap in scrollview ? It always returns null – Anand Savjani Aug 13 '16 at 05:59
1

@AnandSavjani and @OckhamsRazor; For those who receive **null**: http://stackoverflow.com/a/4618030/5318303 – Mir-Ismaili Jan 08 '17 at 19:17
great solution @Mir-Ismaili – Anand Savjani Jan 09 '17 at 04:01

score 3 · Answer 2 · answered May 22 '14 at 04:05

3

    /***
 * 
 * @param flameLayout/linearLayout...
 * @param width
 * @param height
 * @return
 */
public static Bitmap viewToBitmap(View view, int width, int height) {
    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    view.draw(canvas);
    return bitmap;
}

answered May 22 '14 at 04:05

baotiit

31
3

1

Perhaps give a bit of an explanation as to what your code is doing and why you chose do do it like that. – JamesENL May 22 '14 at 04:26

score 2 · Answer 3 · answered May 18 '16 at 02:33

You cant get bitmap on the views or layout is not being inflated.

Layout will only getting inflated after OnCreate()

.

1.Get bitmap on Button_Clicked(View view){}

2.Or using a Handle()to post delaying your get bitmap

3.Make sure drawing cache is created using view.buildDrawingCache();

Get bitmap from layout

3 Answers3

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