android 无线打印实现源代码 附带send2Printer

package com.rcreations.testprint; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.Picture; import android.net.Uri; import android.os.Environment; import android.util.Log; public class PrintUtils { // for logging private static final String TAG = PrintUtils.class.getSimpleName(); // Send 2 Printer package name private static final String PACKAGE_NAME = "com.rcreations.send2printer"; // intent action to trigger printing public static final String PRINT_ACTION = "com.rcreations.send2printer.print"; // content provider for accessing images on local sdcard from within html content // sample img src shoul be something like "content://s2p_localfile/sdcard/logo.gif" public static final String LOCAL_SDCARD_CONTENT_PROVIDER_PREFIX = "content://s2p_localfile"; /** * Returns true if "Send 2 Printer" is installed. */ public static boolean isSend2PrinterInstalled( Context context ) { boolean output = false; PackageManager pm = context.getPackageManager(); try { PackageInfo pi = pm.getPackageInfo( PACKAGE_NAME, 0 ); if( pi != null ) { output = true; } } catch (PackageManager.NameNotFoundException e) {} return output; } /** * Launches the Android Market page for installing "Send 2 Printer" * and calls "finish()" on the given activity. */ public static void launchMarketPageForSend2Printer( final Activity context ) { AlertDialog dlg = new AlertDialog.Builder( context ) .setTitle("Install Send 2 Printer") .setMessage("Before you can print to a network printer, you need to install Send 2 Printer from the Android Market.") .setPositiveButton( android.R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick( DialogInterface dialog, int which ) { // launch browser Uri data = Uri.parse( "http://market.android.com/search?q=pname:" + PACKAGE_NAME ); Intent intent = new Intent( android.content.Intent.ACTION_VIEW, data ); intent.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP ); context.startActivity( intent ); // exit context.finish(); } } ) .show(); } /** * Save the given picture (contains canvas draw commands) to a file for printing. */ public static File saveCanvasPictureToTempFile( Picture picture ) { File tempFile = null; // save to temporary file File dir = getTempDir(); if( dir != null ) { FileOutputStream fos = null; try { File f = File.createTempFile( "picture", ".stream", dir ); fos = new FileOutputStream( f ); picture.writeToStream( fos ); tempFile = f; } catch( IOException e ) { Log.e( TAG, "failed to save picture", e ); } finally { close( fos ); } } return tempFile; } /** * Sends the given picture file (returned from {@link #saveCanvasPictureToTempFile}) for printing. */ public static boolean queuePictureStreamForPrinting( Context context, File f ) { // send to print activity Uri uri = Uri.fromFile( f ); Intent i = new Intent( PRINT_ACTION ); i.setDataAndType( uri, "application/x-android-picture-stream" ); i.putExtra( "scaleFitToPage", true ); context.startActivity( i ); return true; } /** * Save the given Bitmap to a file for printing. * Note: Bitmap can be result of canvas draw commands. */ public static File saveBitmapToTempFile( Bitmap b, Bitmap.CompressFormat format ) throws IOException, UnknownFormatException { File tempFile = null; // save to temporary file File dir = getTempDir(); if( dir != null ) { FileOutputStream fos = null; try { String strExt = null; switch( format ) { case PNG: strExt = ".pngx"; break; case JPEG: strExt = ".jpgx"; break; default: throw new UnknownFormatException( "unknown format: " + format ); } File f = File.createTempFile( "bitmap", strExt, dir ); fos = new FileOutputStream( f ); b.compress( format, 100, fos ); tempFile = f; } finally { close( fos ); } } return tempFile; } /** * Sends the given image file for printing. */ public static boolean queueBitmapForPrinting( Context context, File f, Bitmap.CompressFormat format ) throws UnknownFormatException { String strMimeType = null; switch( format ) { case PNG: strMimeType = "image/png"; break; case JPEG: strMimeType = "image/jpeg"; break; default: throw new UnknownFormatException( "unknown format: " + format ); } // send to print activity Uri uri = Uri.fromFile( f ); Intent i = new Intent( PRINT_ACTION ); i.setDataAndType( uri, strMimeType ); i.putExtra( "scaleFitToPage", true ); i.putExtra( "deleteAfterPrint", true ); context.startActivity( i ); return true; } /** * Sends the given text for printing. */ public static boolean queueTextForPrinting( Context context, String strContent ) { // send to print activity Intent i = new Intent( PRINT_ACTION ); i.setType( "text/plain" ); i.putExtra( Intent.EXTRA_TEXT, strContent ); context.startActivity( i ); return true; } /** * Save the given text to a file for printing. */ public static File saveTextToTempFile( String text ) throws IOException { File tempFile = null; // save to temporary file File dir = getTempDir(); if( dir != null ) { FileOutputStream fos = null; try { File f = File.createTempFile( "text", ".txt", dir ); fos = new FileOutputStream( f ); fos.write( text.getBytes() ); tempFile = f; } finally { close( fos ); } } return tempFile; } /** * Sends the given text file for printing. */ public static boolean queueTextFileForPrinting( Context context, File f ) { // send to print activity Uri uri = Uri.fromFile( f ); Intent i = new Intent( PRINT_ACTION ); i.setDataAndType( uri, "text/plain" ); i.putExtra( "deleteAfterPrint", true ); context.startActivity( i ); return true; } /** * Sends the given html for printing. * * You can also reference a local image on your sdcard using the "content://s2p_localfile" provider. * For example: <img src="content://s2p_localfile/sdcard/logo.gif"> */ public static boolean queueHtmlForPrinting( Context context, String strContent ) { // send to print activity Intent i = new Intent( PRINT_ACTION ); i.setType( "text/html" ); i.putExtra( Intent.EXTRA_TEXT, strContent ); context.startActivity( i ); return true; } /** * Sends the given html URL for printing. * * You can also reference a local file on your sdcard using the "content://s2p_localfile" provider. * For example: "content://s2p_localfile/sdcard/test.html" */