[Android, 안드로이드] 웹뷰(WebView)에서 PDF 불러오는 방법
웹뷰에서 PDF 링크를 불러왔으나 무한로딩에 빠졌다. 무언가 문제가 있음을 직감했다. 설마 지원을 안하는 것은 아니겠지??? 구글링을 시작했다. PDF를 불러오지 못 한 다면 PDF파일을 앱에 포함시켜 apk를 생성해야하는 당황스러운 상황에 처했다.
웹뷰(WebView)에서 PDF 불러오는 방법
안타깝게도 Android는 WebView에서 즉시 PDF보기를 지원하지 않는다. 다행히 Google에는 Google 문서 도구를 사용하여 PDF를 볼 수 있도록 해준다. 기본적으로 Google Doc 페이지에 PDF를 즉시 삽입하고 로드한다. 코드는 다음과 같다.
[먹히지 않는 코드] URLEncoder를 사용하여 utf-8로 인코딩하였지만 실패하였다.
String url = null;
try {
url = URLEncoder.encode("595754dd-31f9-4417-973c-237775ec6615/resource/01eff3c4-4893-4cbd-8a82-a7fbc5a8cae9/download/booklet-2019.pdf", "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
String path = "https://open.test.com/dataset/" + url;
webView.loadUrl(path);
[성공한 코드] 구글doc사이트에 url를 던져서 읽어올 수 있다.
String pdfUrl = "https://open.test.com/dataset/595754dd-31f9-4417-973c-237775ec6615/resource/01eff3c4-4893-4cbd-8a82-a7fbc5a8cae9/download/booklet-2019.pdf"; String url = "http://docs.google.com/gview?embedded=true&url=" + pdfUrl; webView.loadUrl(url);
[전체 코드]
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.net.http.SslError;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.SslErrorHandler;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import androidx.appcompat.app.AlertDialog;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
public class WebviewActivity extends BasicActivity {
private WebView webView;
private WebSettings webSettings;
private ProgressBar mProgressBar;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_webview);
webView = findViewById(R.id.webView);
mProgressBar = findViewById(R.id.progress1);
findViewById(R.id.close_text).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
findViewById(R.id.close_text).setBackgroundResource(R.drawable.menu_list_selector);
makeVibrate();
finish();
}
});
webView.setWebViewClient(new WebViewClientClass()); // new WebViewClient()); //클릭시 새창 안뜨게
webView.setWebChromeClient(new WebChromeClient()); //웹뷰에서 크롬이 실행가능하도록
webSettings = webView.getSettings(); //세부세팅 설정
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportMultipleWindows(false);// 새창띄우기 허용여부
webSettings.setJavaScriptCanOpenWindowsAutomatically(false);// 자바스크립트 새창뛰우기 (멀티뷰) 허용여부
webSettings.setLoadWithOverviewMode(true); //메타태크 허용여부
webSettings.setUseWideViewPort(true);//화면 사이즈 맞추기 허용여부
webSettings.setSupportZoom(true);//화면 줌 허용여부
webSettings.setBuiltInZoomControls(true); //화면 확대 축소 허용여부
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN); //컨텐츠 사이즈 맞추기
webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE); //브라우저 캐시 허용여부
webSettings.setDomStorageEnabled(true); //로컬저장소 허용여부
//안드로이드 android webview 에서 https 보안에서 컨텐츠(이미지, 텍스트)들이 error, 막히거나, 안보일때 방법
// if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
// {
// webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
// }
//pdf링크 불러오기
String pdfUrl = "https://open.test.com/dataset/595754dd-31f9-4417-973c-237775ec6615/resource/01eff3c4-4893-4cbd-8a82-a7fbc5a8cae9/download/booklet-2019.pdf";
String url = "http://docs.google.com/gview?embedded=true&url=" + pdfUrl;
webView.loadUrl(url);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {//뒤로가기 버튼 이벤트
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {//웹뷰에서 뒤로가기 버튼을 누르면 뒤로가짐
webView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
//웹뷰에서 홈페이지를 띄웠을때 새창이 아닌 기존창에서 실행이 되도록 아래 코드를 넣어준다.
private class WebViewClientClass extends WebViewClient {//페이지 이동
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
mProgressBar.setVisibility(ProgressBar.VISIBLE);
webView.setVisibility(View.INVISIBLE);
}
@Override
public void onPageCommitVisible(WebView view, String url) {
super.onPageCommitVisible(view, url);
mProgressBar.setVisibility(ProgressBar.GONE);
webView.setVisibility(View.VISIBLE);
}
// @Override
// public void onPageFinished(WebView view, String url) {
// findViewById(R.id.progress1).setVisibility(View.GONE);
// }
@Override
public void onReceivedSslError(WebView view, final SslErrorHandler handler, SslError error) {
final AlertDialog.Builder builder = new AlertDialog.Builder(WebviewActivity.this);
String message = "SSL Certificate error.";
switch (error.getPrimaryError()) {
case SslError.SSL_UNTRUSTED:
message = "The certificate authority is not trusted.";
break;
case SslError.SSL_EXPIRED:
message = "The certificate has expired.";
break;
case SslError.SSL_IDMISMATCH:
message = "The certificate Hostname mismatch.";
break;
case SslError.SSL_NOTYETVALID:
message = "The certificate is not yet valid.";
break;
}
message += " Do you want to continue anyway?";
builder.setTitle("SSL Certificate Error");
builder.setMessage(message);
builder.setPositiveButton("continue", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
handler.proceed();
}
});
builder.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
handler.cancel();
}
});
final AlertDialog dialog = builder.create();
dialog.show();
}
}
}
[activity_webview.xml]
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/color1">
<LinearLayout
android:id="@+id/top_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:layout_marginRight="20dp"
android:layout_marginBottom="5dp"
android:gravity="right"
android:orientation="horizontal">
<TextView
android:id="@+id/close_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableLeft="@drawable/baseline_cancel_24"
android:text="@string/cont_13"
android:background="@drawable/menu_list_selector"
android:textColor="@color/color_gray"/>
</LinearLayout>
<LinearLayout
android:id="@+id/topLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginBottom="70dp"
android:gravity="center|top"
android:background="@drawable/bg_round_radius"
android:layout_below="@+id/top_layout"
android:orientation="vertical">
<WebView
android:id="@+id/webView"
android:layout_margin="5dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorWhite" />
</LinearLayout>
<ProgressBar
android:id="@+id/progress1"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
[AndroidManifest.xml]
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="app.test">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:name=".common.MyApplication"
android:allowBackup="false"
android:fullBackupContent="false"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".IntroActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".WebviewActivity"
android:exported="false"
android:theme="@style/AppTheme.NoActionBar" />
</application>
</manifest>
[REFERENCE]
kylewbanks.com/blog/Loading-PDF-in-Android-WebView
[관련자료]
stackoverflow.com/questions/30461392/android-pdf-not-loading-in-browser-and-webview
www.tutorialspoint.com/how-to-display-a-pdf-document-into-an-android-webview
