Generate bitmap from HTML in Android

Question

How do can you generate a bitmap from HTML in Android?

Can the WebView be used for this or is there a better approach (like maybe using the WebVie

Answer 1

This example shows how to capture webView content last picture (it waits until webview complete rendering picture), it is an example of convert HTML to PNG using Android

Activity Code

public class HtmlViewer extends Activity {
private String HTML; 
private Context ctx;
private Picture pic = null;
private int i=0; suppose this is the last pic
private int oldi = 0; 
private Timer myTimer; // timer for waiting until last picture loaded
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_html_viewer);
    Intent intent = getIntent();
    HTML = intent.getStringExtra("HTML");
    ctx = this;
    WebView wv = (WebView)findViewById(R.id.webView1);
    wv.setPictureListener(new PictureListener(){

        public void onNewPicture(WebView view, Picture picture) {
            Log.w("picture", "loading.." + String.valueOf(view.getProgress()));
            pic = picture;
            i++;


            }

        });
    wv.loadData(HTML, "text/html; charset=utf-8", null);

    wv.setWebViewClient(new WebViewClient()     
    {
        public void onPageFinished(WebView wv, String url)
        {
            Picture p = wv.capturePicture();
            myTimer = new Timer();
            myTimer.schedule(new TimerTask() {          
                @Override
                public void run() {
                    if (i > oldi)
                        oldi = i;
                        else
                            if (i != 0)
                        {
                            Log.w("picture", "finished");
                            cancel();
                            Picture picture = pic;

                            Log.w("picture", "onNewPicture- Height"+ picture.getHeight());
                            Log.w("picture", "onNewPicture- Width"+ picture.getWidth());

                            File sdCard = Environment.getExternalStorageDirectory();
                            if (picture != null)
                            {
                                Log.w("picture", " P OK");
                            Bitmap image = Bitmap.createBitmap(picture.getWidth(),picture.getHeight(), Config.ARGB_8888);
                            Canvas canvas = new Canvas(image);
                            picture.draw(canvas);
                            Log.w("picture", "C OK");

                            if (image != null) {
                                Log.w("picture", "I OK");
                                ByteArrayOutputStream mByteArrayOS = new ByteArrayOutputStream();
                                image.compress(Bitmap.CompressFormat.PNG, 90, mByteArrayOS);
                                try {
                                    File file = new File(sdCard, "AccountView.PNG");
                                    FileOutputStream fos = new FileOutputStream(file);
                                    fos.write(mByteArrayOS.toByteArray());
                                    fos.flush();
                                    fos.close();                                        
                                    Log.w("picture", "F OK " + String.valueOf(mByteArrayOS.size()) + " ? " + String.valueOf(file.length()));
                                    Intent sharingIntent = new Intent(Intent.ACTION_SEND);
                                    Uri screenshotUri = Uri.fromFile(file);                      
                                    sharingIntent.setType("image/png");
                                    sharingIntent.putExtra(Intent.EXTRA_STREAM, screenshotUri);
                                    startActivity(Intent.createChooser(sharingIntent, getResources().getString(R.string.ACCOUNT_VIEW_TITLE)));                      
                                    ((Activity)ctx).finish();
                                } catch (FileNotFoundException e) {
                                    e.printStackTrace();
                                } catch (IOException e) {
                                    e.printStackTrace();
                                }
                            }               
                            }

                        }
                }

            }, 0, 1000);

            Log.w("picture", "done");

            loadcompleted = true;
        }
    });



}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_html_viewer, menu);
    return true;
}



}

Layout