android 打印机列表中,在android中打印只搜索打印机

我已经做了一个android应用程序，我试图打印一个示例文本文件，我想使用wifi连接打印机，我试过这个链接Wifi printing in android但它只是去搜索wifi打印机和什么都不做，我的代码如下，请帮助我，挽救我的生命在android中打印只搜索打印机

代码

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);

}

}

清单

package="com.example.wifiprint"

android:versionCode="1"

android:versionName="1.0" >

android:minSdkVersion="8"

android:targetSdkVersion="21" />

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

android:name=".MainActivity"

android:label="@string/app_name" >

+0

是您解决您的问题同样的问题对我来说。 –