Printing in android only searching the printers

Question

I have made an android app in that i have tried to print a sample text file,I want to use wifi connected printers,I tried this linkWifi printing in android But it only goes to searching wifi printer and do nothing,MY code is as below,Please help me and save my life

code

public class MainActivity extends Activity {

    public int pageHeight;
    public int pageWidth;
    public PdfDocument myPdfDocument;
    public int totalpages = 4;
    Button button1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button1 = (Button) findViewById(R.id.button1);

    }

    PrintDocumentAdapter pda = new PrintDocumentAdapter() {

        @Override
        public void onWrite(PageRange[] pages,
                ParcelFileDescriptor destination,
                CancellationSignal cancellationSignal,
                WriteResultCallback callback) {
            InputStream input = null;
            OutputStream output = null;

            try {

                input = getAssets().open("sample.txt");
                output = new FileOutputStream(destination.getFileDescriptor());

                byte[] buf = new byte[1024];
                int bytesRead;

                while ((bytesRead = input.read(buf)) > 0) {
                    output.write(buf, 0, bytesRead);
                }

                callback.onWriteFinished(new PageRange[] { PageRange.ALL_PAGES });

            } catch (FileNotFoundException ee) {
                // Catch exception
            } catch (Exception e) {
                // Catch exception
            } finally {
                try {
                    input.close();
                    output.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        @SuppressLint("InlinedApi")
        @Override
        public void onLayout(PrintAttributes oldAttributes,
                PrintAttributes newAttributes,
                CancellationSignal cancellationSignal,
                LayoutResultCallback callback, Bundle extras) {

            if (cancellationSignal.isCanceled()) {
                callback.onLayoutCancelled();
                return;
            }

            //int pages = computePageCount(newAttributes);

            PrintDocumentInfo pdi = new PrintDocumentInfo.Builder(
                    "Name of file").setContentType(
                    PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build();

            callback.onLayoutFinished(pdi, true);
        }
    };

    @SuppressLint("InlinedApi")
    public void printDocument(View view) {
        PrintManager printManager = (PrintManager) this
                .getSystemService(Context.PRINT_SERVICE);
        String jobName = this.getString(R.string.app_name) + " Document";
        printManager.print(jobName, pda, null);
    }

}

manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.wifiprint"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />

    <uses-feature android:name="android.hardware.wifi" />

    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".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>
    </application>

</manifest>

Answer 1

You should make button listener first for button event.

    Button button1 = (Button) findViewById(R.id.button1);
    button1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            doCustomPrint();
        }
    });

And this print method for custom document print;

    private void doCustomPrint() {

    PrintDocumentAdapter pda = new PrintDocumentAdapter(){

        @Override
        public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback){
            InputStream input = null;
            OutputStream output = null;

            AssetManager assetManager = getAssets();

            try {
                // File for print.
                input = assetManager.open("abc.pdf");
                output = new FileOutputStream(destination.getFileDescriptor());

                byte[] buf = new byte[1024];
                int bytesRead;

                while ((bytesRead = input.read(buf)) > 0) {
                     output.write(buf, 0, bytesRead);
                }

                callback.onWriteFinished(new PageRange[]{PageRange.ALL_PAGES});

            } catch (FileNotFoundException ee){
                //Catch exception
            } catch (Exception e) {
                //Catch exception
            } finally {
                try {
                    input.close();
                    output.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        @Override
        public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras){

            if (cancellationSignal.isCanceled()) {
                callback.onLayoutCancelled();
                return;
            }

            PrintDocumentInfo pdi = new PrintDocumentInfo.Builder("print_doc.pdf").setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).build();
            callback.onLayoutFinished(pdi, true);
        }
    };

    PrintManager printManager = (PrintManager) this.getSystemService(Context.PRINT_SERVICE);
    String jobName = this.getString(R.string.app_name) + " Document";
    printManager.print(jobName, pda, null);
}

And check this documents.

http://developer.android.com/training/printing/index.html

How to Print PDF using Android 4.4 Printing framework