How to set a bitmap as widget

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Posts: 96

posted 10 months ago

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Hi i am trying to set a piechart as a widget but i only get blank widget with default message "Tap to open this app so your widget can refresh"

the code i am using is

MainActivity man=new MainActivity();
    PieChart widgetPie =man.pieChart;//this is setting activity cahrt from main activity where code is run
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        for (int appWidgetId : appWidgetIds) {
            Intent intent = new Intent(context, MainActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_IMMUTABLE);
            RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_example);//this is just set to match parent ,match parent
            views.setBitmap(0,"update",getBitmapFromViewUsingCanvas(widgetPie));
            views.setOnClickPendingIntent(man.pieChart.getId(), pendingIntent);
            appWidgetManager.updateAppWidget(appWidgetId, views);
        }
    }

private Bitmap getBitmapFromViewUsingCanvas(View view) {
        // Create a new Bitmap object with the desired width and height
        Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
        // Create a new Canvas object using the Bitmap
        Canvas canvas = new Canvas(bitmap);
        // Draw the View into the Canvas
        view.draw(canvas);
        // Return the resulting Bitmap
        return bitmap;
    }

Never made a widget before my manifest is correct and i dont get any errors in logcat any help would be great thanks

Tim Moores

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177

posted 10 months ago

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This looks really weird. No Activity is involved in a widget, but you need a class extending AppWidgetProvider. That's where the onUpdate method goes.

In general, if you want to check which code of yours is called, add a Log.d(...) statement at appropriate places, e.g. between lines 4 and 5 here.

If you want to learn widgets, don't start from scratch creating one - it's not obvious what all you need to do. Start with a working one like https://www.vogella.com/tutorials/AndroidWidgets/article.html, and work your way from there.

john bean

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posted 10 months ago

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thanks for reply i am extending correct class i think it may be due to the info being got in mainactivity and then requesting it from AppWidgetProvider class when app is closed but it should get info when app is launched but the widget stays empty just t be sure my xml is

manifest has

and xml/example_appwidget_info

A I JUST TRIED ON EMULATOR AND GOT A NULLPOINTER it seems my widgetPie which is a piechart setup in mainactivity must need to move things around

Tim Moores

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posted 10 months ago

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From the excerpts you posted I can't tell if you're going about this the right way. But "MainActivity" sounds like it might be an Activity, which is something you would never construct yourself. If it is is not an Activity, then it is not possible to advise what to check because we haven't seen enough of the code.

john bean

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posted 10 months ago

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k so i think i could not use an image from mainactivity due to the app being closed and could not gather info from onupdate in widget class so i figure save as sharedpreferences now i dont get any null pointers and it seems to be saving and loading the string but the widget is just blank if anyone can tell me what im doing wrong

public class Widget extends AppWidgetProvider {
    ImageView iv;

@Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {

System.out.println("in onupdate");
        for (int appWidgetId : appWidgetIds) {
            iv = new ImageView(context.getApplicationContext());
            retrieve();

Intent intent = new Intent(context, MainActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity
                    (context, 0, intent, PendingIntent.FLAG_IMMUTABLE);

RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_example);
           // views.setOnClickPendingIntent(R.id.iv, pendingIntent);
            views.reapply(context.getApplicationContext(), iv);
            appWidgetManager.updateAppWidget(appWidgetId, views);

}
    }
    private void retrieve() {
        String previouslyEncodedImage = MainActivity.shre.getString("image_data", "");
        if (!previouslyEncodedImage.equalsIgnoreCase("")) {
            byte[] decodedString = Base64.decode(previouslyEncodedImage,Base64.DEFAULT);
            InputStream inputStream  = new ByteArrayInputStream(decodedString);
            System.out.println("inputstream   "+previouslyEncodedImage);
            Bitmap bitmap  = BitmapFactory.decodeStream(inputStream);
            iv.setImageBitmap(bitmap);

}

}
}

this is my output

: in onupdate
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: inputstream   /9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEB
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/2wBDAQEBAQEBAQEBAQEBAQEBAQEBAQEB
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: AQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQH/wAARCACDAIMDASIA
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: AhEBAxEB/8QAHQABAAIDAQEBAQAAAAAAAAAAAAoLBwgJBgEEBf/EAEQQAAAGAgIAAwUADQoHAQAA
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: AAIDBAUGBwABCAkKExQREhUWIRcYGTE4UVdYdHeWttQ0N3GBl6GztdXWGiIkQ2GRmNj/xAAeAQEA
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: AAYDAQAAAAAAAAAAAAAAAwQFBgcIAgkKAf/EAEkRAAEEAQIACAUKFwAAAAAAAAEAAgMEBQYRBwgS
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: EyFBUWExM1aR8BQVI0JScpWxwdQWFxgiJCUmMjU2RVNxdIGSobK10dXh8f/aAAwDAQACEQMRAD8A
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: mIdm0Cjlp9cPOqDS8kAWOQ8ReQIVZigJQhNatDVkmdmt3BsYDiQLGB3QoXhIbsBgCViAk3Whe5r2
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: 0d+XdXbNAbntbrZ5pVfQR0OS2RYvH+wYUQvnj67x2Nt8QkjKoa7KWHOTFH5O6fFCq5USoMdRkNIy
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: XCRDaka5a1oDlTmkpPYREHuwZpEYDGiSVEjm8nYIgwJ1BwUxB73JXZIytRJ6getgIJNXLSAGnC1s
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: JQBCGLWwh3hF5fGWRgvBOcSPtefgweVXILfKf5S8zVgC+x9qjt2D8K9nlbrHUD3NQwPbx/2dWcKT
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: BRb9R8UEZrSDcALlxxQuzhByHszi/wAhoyXFbWqt6Lan5EkWAc2ZzRr0KV4j8mjbsWAoDtGZSwOD
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: a/MS/ZKZQa3LyAL0Te4lK0CYitVOgDsR4E3bwj4s8RONFiAkN08a+H1GCvytY7UNtRsmHzf5VjzX
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: Zzie+vdfskPky5ythdIFDy7xV9fiXp4cFb2UqWJV2l5u9/NztP69+u1VXJXNG2D6XVXCXLlNeica
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: Ruqa7lAYOZHAS0wB9dVlMQIhtI5fHfOC8GIDVOnQsSMKkJSrZFax4XnnJC+EnaZCtWi/pozV3JiC
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: P/G6SyFzVkpGONv8rfIzJ65fng5QICdKkHOogzRRQ5nmkkM6GWrnJWcWgTqxZPP8RB1GyHtg4fx9
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: lqFW0IeS/HyTO1g0uU/KUzc0TNI+tRLXOqvXParXksHzilbWBzaHdQYU3EyaKsKV5PRM6xe5ISL+
2023-07-26 16:07:32.583 23986-23986/com.example.piechart I/System.out: T/xPXQp+eWj/APlrlp/+fs618OOZPGPnZTCW/OJFgF2XT62SP0VSygqFTmAhNkMbMTkviL5fsOLQ
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: +Rg2jMVJwbVmMwEan3valUnhAPYaVG6eEvMHjpLnCC3lxjvOsJO2rTG81BK6ylqBOrPLN0Vo1ldv
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: hZjNIECgYgbROrC4OTYvLMLOQq1BJpYxWfPhM4PNYD1Bw1nncQlEKdll7XS8o2uWx92jjiqZ3ByZ
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: fQOqZE8JEak9tW+Sd6RcUUJKp8ozyTR+WP2EUlwQdC1sO9aEEWt6EHetb0LW9ezet639N63r6b1v
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: 6b1/fT6c77vonkl4hp/uatJIimVDzPm9xyCnkJjG9R5vc2GOuNSxKYeYyypoZXZMkTOLE/ITNr2p
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: OSsKTCWJvUoFKdSdZ/8AanzohHXXwVvzk1LHhChf47DHeP1EyKVOiVk0umTtqxsrWLNhIQmKVIjp
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: AYQ6vRqQhQNoizS/v55ekTSqGCkcApUlKQLC1B5aws8KktUA0wCkCkBmjQqAHhFo0J4DdaMCaEWj
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: Ama0PQtC17cIrvftRqy1rw63+blOUcyqJJbFn8a7WgsJjiVybGhTInWTxZe0jYCHJ6cWlpSGPSFU
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: rbAmuTkjRb9V7ig4JQha3SA5dGdKfZRCuz3ghVV0o3xCdc8PZGituSsR0aSW7xi4o42J0b08HNwD
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: TRp41Y5acE+hioBilOJme/gx6vb+wSBC3xIe0HwfHIJyvSwrh65ZbWcpqmxJQ/zIqhbEf/sey2r1
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: 8hcTnVVEYQ/mNZ8Nk8FbVapURGdvjnFHxhYwNjGv+aFSJTJFxFBRyxt8EEkloONnOxcsEq3BFN4V
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: UkjgR+b6IMtRwJ8Omok+tmbJ0qEzr4DpZssoBuyQIfOMMBogJXEGhvB79r9ky9sa7iBR3HKFCWgC
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: /S2R2Wz2Q7pG3Qh6PUR+JViZIAPjl7oAiStztI4ojP2YAKl4Re6MQLGXrp4BUl1o8VYHxVoopwVx
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: +LmLn2VzF8CRqT2TYT95Bkpnkl2m1pOWvdTEqREgb03tSMcfbGVgRjMSNZJgyKIB44mARvce68rS
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: AAoiXgeeQsAPMAEsJ7pGzENVSJIBQL3NmmFMLmUtEjDowJZI5Iu2IAxHhEDyPge7kTEvfP8A4+Ll
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: hAVji1UdckYb/f0FUYmZlc+hM6WaBsftMIINfq7I2MANaIMUa0YPe1BWg6EeMN51wrkpznq/jDW7
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: 2jkcd4Vw6WMU0eG1V6lAC7LVcI85T2MkGFaEkUmQ6PQuBNDocScaYhlBklj6stOsZVJYuNHSz2Hj
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: 6xeweneS7uWvWVaf8TrC9mlrIEpcXGnJ4JEmkitAlBrzVzjEXVBH7AamwkZQ3d0iCJpEcSUuMMCR
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: XT+M8dXlhQe2YJD7PrOVsc5rywI2zy+FTKMuBDrH5PGH9CS5Mz20OKYYyFaBwQqCVBBwBfUA9aFo
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: I9CDphFWGzjxlPZ5P4XL4I8UVwNTNE1i8giTqpbKw5BkuSdtkbSrZ1x7ecr5QrEpS0pKsNMSGKUa
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: ogB4SxHJjy9CKHE3bXJwZnFA7tK5W2OrUtSuTY5IFBqRc3uCE8tUiXIlZAwHplaRSUWenUEjAaQc
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: WAwsYRh1vX4sYRWGPAHxmNe7hFV152BVLIEEyj8OmSW0+QNZBE4Ipc+R8bOCtFDFUaRtVHfMM4bT
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: ncmwFSiXRqMschaCXpgSaaJP8uRKIv3J9hjb2f8APu2OV0ahjjAIE9t0ShNbxl/9CKVp4PBWJOzN
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: jjLxtate2akr6s04vi9G2rVyFmLcU7CmcXUprC6reW2MImS9OqbxaXJHhvD4pQ3MiEOfLSkIqiSM
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: UWniJ/KaeQsGj6EjyETUa8vezmG1mlsIKTo2pFK1UckiVOIQVE8XIkiBqJiF4witk4J4t7pglrGk
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: dZDbFy1e4KE5Zx8ZnFBz9xeUBowaENIpU1qjsGOmHFC3ssQ0b6qTiEHewHjBvQ9668l/GU9bVZR5
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: eHjnAb15OTgaVTtlTCjBVOV76wBf/TAkEqnBhkwQJzjRB377PWj+PygG+ZogflaMq9sYRdne6nt1
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: sLtk5ARmfjd7DjdJw+CQlJCaMkxzImi9eWEdD2VJbjtGkMdVrCndJJZoldV7PJZUtcpjuOnt7OrU
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: IG9AkaEfGLGMIt5OAXYryp60rvS3txXnvyy+qExLTM4e+JjnqubPjJSj1O4xYMV0qRlvLaE7ZhqB
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: ejVtkjYFJpy2OPjOtNMUCnv8SfGgcI7CYGtt5f0pb/HafgShC8PkAQJLjqdWpKFosxUhUo1jHYzT
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: 6zW/VFNBsJfi0APMSGSNwMJLUqqzzGEVpLO/F5dcMf5EwljiMwfp1xiWU7NpBPZw1U5azfaDPcrd
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: IWBLBoGxR6VIos0rmSQxxVIXNyejgCRt61qSJjHdPtYErfE7s18Yvad2w6RVB111dJeOzBI0alqd
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: +QFnLGVbdmmpYWoTqiIDEo2teonXDoYSIGi5Wok82ekpZ5pjGnjTwmRvJUIvGEX7HBwXuy9c6uq5
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: Y5ujmsUuDk5OCk5avcF604alYuXLFIzVCtYrUGmHqVJ5hhx5xgzTRjMGIWfjxjCLZivuafMepYg0
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: V9VXLPkxWUCj/r/gMIr6+LShkQZPirote3T4RGo5Km1mbfiTy5OLuv8ARoifWOi9avUeYrVHmmM1
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: nxhExjGETGMYRMYxhExjGETGMYRMYxhExjGETGMYRMYxhExjGETGMYRMYxhExjGETGMYRMYxhExj
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: GETGMYRMYxhExjGETGMYRMYztj0L9WCPta5vIaqnrg8MPHupoqptu/nxjP0gdVkTbXNvaWWCMrsY
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: WaU1PU7fnBOhEv2H1LbGEEqeW/3nBqTAERcTsZbCc/uV3Tl0GUnV0G1wcqdymNoNq9RXFC11VNeD
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: mr3GGQKVAtnFtT2btyx1JRmG7Qtap+lKqVSx7e/UoESN9AxPrm3aa0/1/wDS34kLhhJuR1C8aWbg
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: tyJRSCU1u8LqmTMsScq7tVoRoJMkMlcEhxMerC3YpJG2QML2qkqiGNEsdWxc5NCOQxt9bFokZFWi
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: 4yxN8Kn1/QCGvvafQPMHj1TNl2lx05EVrVzhuya0h1iFM65lb7PQOiiJOExj7goJjsk23InpuVog
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: JSHprNa3ERYgjJ2HK3Zh2wdJnBzmJanBLkD0/VbZ26zNrcMpm8S4+8XlTQahsat4VZZTgwND2zMr
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: uFwZGqZJkYg6cWs85xbjRpF6cswk4JFWuYywL75fDccKa44ZWXz16/Wl6px5qiPNltTmnNyeQyiu
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: JrWD+vSCfHiMJpo4PElgb/H0TidJ0TakfBxI5kaXOON8Za1O2w9LX6YRMYxhExjGETGMYRN73vft
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: 3n3Wt637Nff/AKvxf+vvZ8z1kQgsvn7ia0QuOu8ldCEpi05AzIVLgrLRlGEkmqhkJSjTAkFmqCCx
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: mbDoARmlh3v2i17fhIHSTsO0952Hb8qmKlS1fsw06Vae3bsPEcFatE+aeaR33rIoo2ue956mtaSe
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: oLyeMzr9rLf35JJ7+zDz/B4+1lv78kk9/Zh5/g8h89F7tvp/34+wq6Ppfa78jdUfAWS+bd486wX9
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: da/8C/v9mT1PA/szW5q+0QasJXrhxfiezkmCDrzgNbwbyb26hAPXsMCUM5A1iOCAWtCEWRsX/MAG
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: 9QSZPFpFDHpVHZUzuDC+IQpxLGp0SnIlyYKpOUrTbOTKAFnF6PSnkqCtjAH3yjQGB9oRB3uSN4W7
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: surLr950yiE37I2+GUPy1hbXWUlnLueBEwwSw468HOtYyeVORykpO1xIzbtK4k8Op5Qk7MdLG58c
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: VTcyNTsrDFBBG4O4OxB6iOnp9O9WrZrWKk81W1DLWs15Hwz1543RTQyxktfHLFIA+ORjgWuY9oc1
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: wIIBGy3d8QTxes3sa8ROm4kRGy6srF73xrrpqiExvOTPEUrVhY4zXkxuJ0RuD0zR+UL0Zjo5usgI
2023-07-26 16:07:32.584 23986-23986/com.example.piechart I/System.out: ayUzMeWqe3Aoo4xOE0w8HkmXwivcFRZAL547cn+MJ9nwtmXyitllB3xdEBs56WKmZSQnRV3YLnVN
2023-07-26 16:07:32.585 23986-23986/com.example.piechart I/System.out: eR9kc5I2L1DYkdXSfRhiPRuJpbi+JW1Sebvov4prpT5X8vORNVc5eFFYOvIFDLKtjtY2zC4GsZVk
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2023-07-26 16:07:32.586 23986-23986/com.example.piechart I/System.out: HNYnZXbZszXJwJbUs9h/OWbE0pMkriC8huzQ1owVrDWOo9faiyGq9WZF+Wz+UNc3sg+GvXfOatWG
2023-07-26 16:07:32.586 23986-23986/com.example.piechart I/System.out: nATFViggZzdavDGObibuGAu3cSSxjGXCrZTGMYRMYxhExjGETGMYRMYxhExjGETGMYRMYxhExjGE
2023-07-26 16:07:32.586 23986-23986/com.example.piechart I/System.out: X//Z

so it seems the image is saved as string and loaded but its just blank in my widget

john bean

Ranch Hand

Posts: 96

posted 10 months ago

Number of slices to send:

Optional 'thank-you' note:

Send

k just builth a test app and converting the layout into imageview seems to be where its going wrong

pierel is a relativelayout

Consider Paul's rocket mass heater.