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In this tutorial explain how to convert  .png image to .bmp format.

Example:

import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;

import android.graphics.Bitmap;

public class AndroidBmpUtil {
    private static  final int BMP_WIDTH_OF_TIMES = 4;
    private  static final int BYTE_PER_PIXEL = 3;

    public static boolean save(Bitmap orgBitmap, String filePath){

        if(orgBitmap == null){
            return false;
        }

        if(filePath == null){
            return false;
        }

        boolean isSaveSuccess = true;


        int width = orgBitmap.getWidth();
        int height = orgBitmap.getHeight();


        int dummySize = 0;
        byte[] dummyBytesPerRow = null;
        boolean hasDummy = false;
        if(isBmpWidth4Times(width)){
            hasDummy = true;
            dummySize = BMP_WIDTH_OF_TIMES - (width % BMP_WIDTH_OF_TIMES);
            dummyBytesPerRow = new byte[dummySize * BYTE_PER_PIXEL];
            for(int i = 0; i < dummyBytesPerRow.length; i++){
                dummyBytesPerRow[i] = (byte)0xFF;
            }
        }

        int[] pixels = new int[width * height];
        int imageSize = pixels.length * BYTE_PER_PIXEL + (height * dummySize * BYTE_PER_PIXEL);
        int imageDataOffset = 0x36;
        int fileSize = imageSize + imageDataOffset;


        orgBitmap.getPixels(pixels, 0, width, 0, 0, width, height);


        ByteBuffer buffer = ByteBuffer.allocate(fileSize);

        try {

            buffer.put((byte)0x42);
            buffer.put((byte)0x4D);

            //size            buffer.put(writeInt(fileSize));

            //reserved            buffer.put(writeShort((short)0));
            buffer.put(writeShort((short)0));

            //image data start offset            buffer.put(writeInt(imageDataOffset));

            //size            buffer.put(writeInt(0x28));

            //width, height            buffer.put(writeInt(width));
            buffer.put(writeInt(height));

            //planes            buffer.put(writeShort((short)1));

            //bit count            buffer.put(writeShort((short)24));

            //bit compression            buffer.put(writeInt(0));

            //image data size            buffer.put(writeInt(imageSize));

            //horizontal resolution in pixels per meter            buffer.put(writeInt(0));

            //vertical resolution in pixels per meter (unreliable)            buffer.put(writeInt(0));


            buffer.put(writeInt(0));


            buffer.put(writeInt(0));


            int row = height;
            int col = width;
            int startPosition = 0;
            int endPosition = 0;

            while( row > 0 ){

                startPosition = (row - 1) * col;
                endPosition = row * col;

                for(int i = startPosition; i < endPosition; i++ ){
                    buffer.put(write24BitForPixcel(pixels[i]));

                    if(hasDummy){
                        if(isBitmapWidthLastPixcel(width, i)){
                            buffer.put(dummyBytesPerRow);
                        }
                    }
                }
                row--;
            }

            FileOutputStream fos = new FileOutputStream(filePath);
            fos.write(buffer.array());
            fos.close();
        } catch (IOException e1) {
            e1.printStackTrace();
            isSaveSuccess = false;
        }
        finally{

        }

        return isSaveSuccess;
    }


    private static  boolean isBitmapWidthLastPixcel(int width, int i) {
        return i > 0 && (i % (width - 1)) == 0;
    }


    private static  boolean isBmpWidth4Times(int width) {
        return width % BMP_WIDTH_OF_TIMES > 0;
    }


    private static  byte[] writeInt(int value) throws IOException {
        byte[] b = new byte[4];

        b[0] = (byte)(value & 0x000000FF);
        b[1] = (byte)((value & 0x0000FF00) >> 8);
        b[2] = (byte)((value & 0x00FF0000) >> 16);
        b[3] = (byte)((value & 0xFF000000) >> 24);

        return b;
    }


    private static  byte[] write24BitForPixcel(int value) throws IOException {
        byte[] b = new byte[3];

        b[0] = (byte)(value & 0x000000FF);
        b[1] = (byte)((value & 0x0000FF00) >> 8);
        b[2] = (byte)((value & 0x00FF0000) >> 16);

        return b;
    }


    private static  byte[] writeShort(short value) throws IOException {
        byte[] b = new byte[2];

        b[0] = (byte)(value & 0x00FF);
        b[1] = (byte)((value & 0xFF00) >> 8);

        return b;
    }

}







Create Main Class






GestureOverlayView mSignature;


mSignature=  (GestureOverlayView) findViewById(R.id.shape_1_1);


WitnessSignature.setDrawingCacheEnabled(true);





Bitmap bitmap= Bitmap.createBitmap(mSignature.getDrawingCache());


AndroidBmpUtil.save(getResized(offenderBitmap, 384), 


Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_PICTURES).getAbsolutePath() + "/offender.bmp");




File fil = new File(Environment.getExternalStoragePublicDirectory(
        Environment.DIRECTORY_PICTURES).getAbsolutePath(), "offender.bmp");




 






























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Indicator for ExpandableListView ?





Explain how to used group indicator for custom ExpandableListView in android. you should be add line of code in group view in custom Adapter class.








int imageResourceId = isExpanded ? android.R.drawable.arrow_up_float : android.R.drawable.arrow_down_float;
image.setImageResource(imageResourceId);
image.setVisibility(View.VISIBLE);









ExpandableListView Example











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Print HTML document and webpage in android application.



Printing an html doc with webview involves loading an
html res or building an html doc as a string.







Creating custom print view step by step







1.       Creat
a webviewclient that starts a print job after the html res is loaded.



2.       Load
the html res into the webview object.







private WebView testWebView;



private void TestWebViewPrint() {

    // Create a WebView object specifically for printing

    WebView webView = new WebView(this);

    webView.setWebViewClient(new WebViewClient() {



        public boolean shouldOverrideUrlLoading(WebView view, String url) {

            return false;

        }



        @Override

        public void onPageFinished(WebView
view, String url) {

            Log.i("TAG", "page finished loading " + url);

            createTestWebPrintJob(view);

            testWebView = null;

        }

    });



    // Generate an HTML document on the fly:

    String htmlDocument = "

Test
Content

Androidbeginner tutorial point, " +

            "Hello, Hello...



";

    webView.loadDataWithBaseURL(null, htmlDocument, "text/HTML", "UTF-8", null);



    // Keep a reference to WebView object until you pass the
PrintDocumentAdapter

    // to the PrintManager

    testWebView = webView;

}





private void createTestWebPrintJob(WebView webView) {

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)

    {



        PrintManager printManager = (PrintManager)
this.getSystemService(Context.PRINT_SERVICE);



        PrintDocumentAdapter printAdapter
= webView.createPrintDocumentAdapter();



        String jobName =
getString(R.string.app_name) + " Print Test";



        printManager.print(jobName, printAdapter,new PrintAttributes.Builder().build());

    }

}







you can load a webpage for printing by replacing the
method loadUrl().



 webView.loadUrl("https://developer.android.com/distribute/index.html");














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Example - How to check Bluetooth Off Or On




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




private boolean getBlueToothOn(Context context) {
    BluetoothAdapter btAdapter = ((Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR1)
            ? ((BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE)).getAdapter()
            : (BluetoothAdapter.getDefaultAdapter()));

    if (btAdapter == null) {
        return false;
    }
    if (btAdapter.getState() == BluetoothAdapter.STATE_ON) {
        return true;
    }
}








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Example :-How to set Button background Tint 







1.In AppCompact library,
we can set button background tint .







<Button

    android:id="@+id/btn_done"

    android:layout_width="match_parent"

    android:layout_height="70dp"

    android:layout_below="@+id/seq_layout_attr"

    android:layout_margin="30dp"

    android:backgroundTint="@color/colorPrimary"

    android:text="@string/summit"

    android:textSize="@dimen/textSize"

    android:textColor="@color/white"

    android:textStyle="bold" />











2. Drawable background for a view based on a color (int)
value. I succeeded by using the code:







ColorStateList
csl = new ColorStateList(new int[][]{{}}, new
int[]{colors});

btn_done.setBackgroundTintList(csl);







3. create a Color State List Resource.







xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android"
>

    <item

        android:color="#your_color_here" />

</selector>











  btn_done .setBackgroundTintList(this.getResources()



                                                            
.getColorStateList(R.color.your_xml_name));


























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