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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.app;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.ParcelFileDescriptor;
import android.print.PageRange;
import android.print.PrintAttributes;
import android.print.PrintDocumentAdapter;
import android.print.PrintManager;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import com.example.android.apis.R;
/**
* This class demonstrates how to implement HTML content printing
* from a {@link WebView} which is not shown on the screen.
* <p>
* This activity shows a text prompt and when the user chooses the
* print option from the overflow menu an HTML page with content that
* is not on the screen is printed via an off-screen {@link WebView}.
* </p>
*
* @see PrintManager
* @see WebView
*/
public class PrintHtmlOffScreen extends Activity {
private WebView mWebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.print_html_off_screen);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.print_custom_content, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.menu_print) {
print();
return true;
}
return super.onOptionsItemSelected(item);
}
private void print() {
// Create a WebView and hold on to it as the printing will start when
// load completes and we do not want the WbeView to be garbage collected.
mWebView = new WebView(this);
// Important: Only after the page is loaded we will do the print.
mWebView.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
doPrint();
}
});
// Load an HTML page.
mWebView.loadUrl("file:///android_res/raw/motogp_stats.html");
}
private void doPrint() {
// Get the print manager.
PrintManager printManager = (PrintManager) getSystemService(
Context.PRINT_SERVICE);
// Create a wrapper PrintDocumentAdapter to clean up when done.
PrintDocumentAdapter adapter = new PrintDocumentAdapter() {
private final PrintDocumentAdapter mWrappedInstance =
mWebView.createPrintDocumentAdapter();
@Override
public void onStart() {
mWrappedInstance.onStart();
}
@Override
public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes,
CancellationSignal cancellationSignal, LayoutResultCallback callback,
Bundle extras) {
mWrappedInstance.onLayout(oldAttributes, newAttributes, cancellationSignal,
callback, extras);
}
@Override
public void onWrite(PageRange[] pages, ParcelFileDescriptor destination,
CancellationSignal cancellationSignal, WriteResultCallback callback) {
mWrappedInstance.onWrite(pages, destination, cancellationSignal, callback);
}
@Override
public void onFinish() {
mWrappedInstance.onFinish();
// Intercept the finish call to know when printing is done
// and destroy the WebView as it is expensive to keep around.
mWebView.destroy();
mWebView = null;
}
};
// Pass in the ViewView's document adapter.
printManager.print("MotoGP stats", adapter, null);
}
}
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