Android Printer Integration | Google Cloud Printing in Android Application | Printer demo in Android

Hello Dear Friends,

My this post is based on "How to Integrate printer in android app". the best way of doing that Google cloud printing. Google provide us Print Dialog code, we can use it in our application. Important steps are given below-

1)Login with your gmail-id in chrome on your desktop and add your printers in your browser.
2)Create a demo app and put below code.
3)Add Internet permissions and read storage.

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

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

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

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

1)MainActivity.java

package com.manish.googleprintdemo;

import java.io.File;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

/**

 *

 * @author manish

 *

 */

public class MainActivity extends Activity {

       Button btnPrint;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

              btnPrint=(Button)findViewById(R.id.button1);

             

              btnPrint.setOnClickListener(new OnClickListener() {

                    

                     @Override

                     public void onClick(View v) {

                           // TODO Auto-generated method stub

                            if (isNetworkAvailable() == false) {

                                         Toast.makeText(MainActivity.this,

                                                       "Network connection not available, Please try later",

                                                       Toast.LENGTH_SHORT).show();

                                  } else {

                                         File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/personal/xyz.pdf");

                                         Intent printIntent = new Intent(MainActivity.this, PrintDialogActivity.class);

                                         printIntent.setDataAndType(Uri.fromFile(file), "application/pdf");

                                         printIntent.putExtra("title", "Android print demo");

                                         startActivity(printIntent);

                                  }

                     }

              });

       }

       public boolean isNetworkAvailable() {

              ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

              NetworkInfo networkInfo = cm.getActiveNetworkInfo();

              // if no network is available networkInfo will be null

              // otherwise check if we are connected

              if (networkInfo != null && networkInfo.isConnected()) {

                     Log.e("Network Testing", "***Available***");

                     return true;

              }

              Log.e("Network Testing", "***Not Available***");

              return false;

       }

}

2)PrintDialogActivity.java

package com.manish.googleprintdemo;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.content.ActivityNotFoundException;

import android.content.ContentResolver;

import android.content.Intent;

import android.os.Bundle;

import android.util.Base64;

import android.webkit.WebSettings;

import android.webkit.WebView;

import android.webkit.WebViewClient;

import java.io.ByteArrayOutputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

public class PrintDialogActivity extends Activity {

  private static final String PRINT_DIALOG_URL = "https://www.google.com/cloudprint/dialog.html";

  private static final String JS_INTERFACE = "AndroidPrintDialog";

  private static final String CONTENT_TRANSFER_ENCODING = "base64";

  private static final String ZXING_URL = "http://zxing.appspot.com";

  private static final int ZXING_SCAN_REQUEST = 65743;

  /**

   * Post message that is sent by Print Dialog web page when the printing dialog

   * needs to be closed.

   */

  private static final String CLOSE_POST_MESSAGE_NAME = "cp-dialog-on-close";

  /**

   * Web view element to show the printing dialog in.

   */

  private WebView dialogWebView;

  /**

   * Intent that started the action.

   */

  Intent cloudPrintIntent;

  @SuppressLint("JavascriptInterface") @Override

  public void onCreate(Bundle icicle) {

    super.onCreate(icicle);

    setContentView(R.layout.print_dialog);

    dialogWebView = (WebView) findViewById(R.id.webview);

    cloudPrintIntent = this.getIntent();

    WebSettings settings = dialogWebView.getSettings();

    settings.setJavaScriptEnabled(true);

    dialogWebView.setWebViewClient(new PrintDialogWebClient());

    dialogWebView.addJavascriptInterface(

      new PrintDialogJavaScriptInterface(), JS_INTERFACE);

    dialogWebView.loadUrl(PRINT_DIALOG_URL);

  }

  @Override

  public void onActivityResult(int requestCode, int resultCode, Intent intent) {

    if (requestCode == ZXING_SCAN_REQUEST && resultCode == RESULT_OK) {

      dialogWebView.loadUrl(intent.getStringExtra("SCAN_RESULT"));

    }

  }

  final class PrintDialogJavaScriptInterface {

    public String getType() {

      return cloudPrintIntent.getType();

    }

    public String getTitle() {

      return cloudPrintIntent.getExtras().getString("title");

    }

    public String getContent() {

      try {

        ContentResolver contentResolver = getContentResolver();

        InputStream is = contentResolver.openInputStream(cloudPrintIntent.getData());

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        byte[] buffer = new byte[4096];

        int n = is.read(buffer);

        while (n >= 0) {

          baos.write(buffer, 0, n);

          n = is.read(buffer);

        }

        is.close();

        baos.flush();

        return Base64.encodeToString(baos.toByteArray(), Base64.DEFAULT);

      } catch (FileNotFoundException e) {

        e.printStackTrace();

      } catch (IOException e) {

        e.printStackTrace();

      }

      return "";

    }

    public String getEncoding() {

      return CONTENT_TRANSFER_ENCODING;

    }

    public void onPostMessage(String message) {

      if (message.startsWith(CLOSE_POST_MESSAGE_NAME)) {

        finish();

      }

    }

  }

  private final class PrintDialogWebClient extends WebViewClient {

    @Override

    public boolean shouldOverrideUrlLoading(WebView view, String url) {

      if (url.startsWith(ZXING_URL)) {

        Intent intentScan = new Intent("com.google.zxing.client.android.SCAN");

        intentScan.putExtra("SCAN_MODE", "QR_CODE_MODE");

        try {

          startActivityForResult(intentScan, ZXING_SCAN_REQUEST);

        } catch (ActivityNotFoundException error) {

          view.loadUrl(url);

        }

      } else {

        view.loadUrl(url);

      }

      return false;

    }

    @Override

    public void onPageFinished(WebView view, String url) {

      if (PRINT_DIALOG_URL.equals(url)) {

        // Submit print document.

        view.loadUrl("javascript:printDialog.setPrintDocument(printDialog.createPrintDocument("

          + "window." + JS_INTERFACE + ".getType(),window." + JS_INTERFACE + ".getTitle(),"

          + "window." + JS_INTERFACE + ".getContent(),window." + JS_INTERFACE + ".getEncoding()))");

        // Add post messages listener.

        view.loadUrl("javascript:window.addEventListener('message',"

            + "function(evt){window." + JS_INTERFACE + ".onPostMessage(evt.data)}, false)");

      }

    }

  }

}

3)activity_main.xml

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="Print" />

</RelativeLayout>

4)print_dialog.xml

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent" >

    <WebView

        android:id="@+id/webview"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent" />

</RelativeLayout>

5)AndroidManifest.xml

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

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

    package="com.manish.googleprintdemo"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="16" />

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

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

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

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

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.manish.googleprintdemo.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".PrintDialogActivity" />

    </application>

</manifest>

Download zip code

Thanks!