Web View Android
Rédigé par BeHuman
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Voici une source de base pour faire un navigateur internet sur Android en Java.
MainActivity.java:
package android.linux.webview;
import java.io.File;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.NotificationManager;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.*;
import android.webkit.CookieSyncManager;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.app.AlertDialog;
import android.content.DialogInterface;
@SuppressLint({ "SetJavaScriptEnabled", "ParserError", "ParserError" })
public class MainActivity extends Activity {
private WebView webview;
public static final int intMenu_Exit = 1;
public static final int intMenu_Refresh = 2;
public static final int intMenu_Clear_Cache = 3;
public static final int intMenu_Prefs = 4;
public static final int intMenu_Eval = 5;
static int NOTIFICATION_ID = 0;
public String dataURL;
public String dataLOGIN;
public String dataPASSWORD;
protected ProgressDialog startProgressDialog;
protected ProgressDialog myProgressDialog;
public static final String PREFS_NAME = "webview_config";
int mMetric = 0;
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putString("URL", webview.getOriginalUrl());
super.onSaveInstanceState(savedInstanceState);
}
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
myProgressDialog = ProgressDialog.show(MainActivity.this, "", "Restauration de l'activité en cours...", true);
super.onRestoreInstanceState(savedInstanceState);
String URL = savedInstanceState.getString("URL");
dataURL=URL;
webview.loadUrl(dataURL);
webview.requestFocus();
myProgressDialog.dismiss();
startProgressDialog.dismiss();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
CookieSyncManager.createInstance(this);
CookieSyncManager.getInstance().startSync();
setContentView(R.layout.main);
/*check connection*/
if(isOnline()) { //si connection on affiche le navigateur
webview = (WebView)findViewById(R.id.webview);
webview.setWebViewClient(new WWWViewClient());//permet d'ouvrir les liens url dans le webview et non dans le navigateur
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setLoadsImagesAutomatically(true);
webview.getSettings().setDomStorageEnabled(true);
webview.addJavascriptInterface(new JSInterface(), "android");
webview.setInitialScale(1); // facteur de zoom initial
webview.getSettings().setSupportZoom(true);
webview.getSettings().setBuiltInZoomControls(true); // afficher le contrôle de zoom
webview.getSettings().setUseWideViewPort(true); // activer le double-tap pour zoomer
webview.getSettings().setUserAgentString( "Mozilla/5.0 (Linux; U; Android; fr-fr; Nexus S Build/GRK39F) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 (WebViewApplication)");
webview.loadUrl("http://www.ckdevelop.org");
dataURL="http://www.ckdevelop.org";
webview.requestFocus();
startProgressDialog = ProgressDialog.show(MainActivity.this, "", "Chargement de l'application en cours...", true);
}else{//Sinon on avertie l'utilisateur et on quitte l'application
Activity activity = MainActivity.this; // récupération de l'Activity courante
Command commandeOui = new Command() {
public void execute() {
kill();
}
};
displayYesNoDialog(activity, "Vous n'avez pas d'accès à internet\n\nVérifiez votre connection.", commandeOui);
}
}
//retour en arrière
int menu_plus=0;
int backClose=0;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (menu_plus == 1) {
webview.loadUrl("javascript:mp_click_hide(); return false");
return true;
}
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
if ( webview.getOriginalUrl() != dataURL ) {
backClose=0;
webview.goBack();
return true;
} else {
if ((webview.getOriginalUrl() == dataURL) && (backClose == 0)) {
Context context = getApplicationContext();
Toast.makeText(context, "Cliquer une seconde fois sur retour pour quitter l'application.", Toast.LENGTH_LONG).show();
backClose=1;
return true;
} else if (backClose == 1) {
kill();
}
}
}
return super.onKeyDown(keyCode, event);
}
/***************************************************System********************************************/
//suppression du cache
public void delCache() {
File dir = getCacheDir();
if(dir!= null && dir.isDirectory()){
try{
File[] children = dir.listFiles();
if (children.length >0) {
for (int i = 0; i < children.length; i++) {
File[] temp = children[i].listFiles();
for(int x = 0; x<temp.length; x++)
{
temp[x].delete();
}
}
}
}catch(Exception e)
{
Log.e("Cache", "failed cache clean");
}
}
}
//onDestroy est appelé lorsque finish est invoqué sur l'activité
@SuppressWarnings("deprecation")
public void kill() {
//demande au système de fermer tout objet de l'application de sorte que l'appli puisse être tuée sans risque
//true implique que le processus ne sera tué que quand tous les threads auront été fermés
((NotificationManager)getSystemService(NOTIFICATION_SERVICE)).cancel(NOTIFICATION_ID);
System.runFinalizersOnExit(true);
//force l'application à se fermer complètement et à ne passer en arrière-plan
System.exit(0);
}
//destruction après Kill();
@Override
public void onDestroy() {
super.onDestroy();
finish();
}
//pause
@Override
public void onPause() {
super.onPause();
SharedPreferences settings = getSharedPreferences(PREFS_NAME,0);
SharedPreferences.Editor editor = settings.edit();
// Necessary to clear first if we save preferences onPause.
editor.clear();
editor.putInt("Metric", mMetric);
editor.commit();
//statusNotify();
}
/***************************************************MENU********************************************/
//Construction du Menu
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
boolean result = super.onCreateOptionsMenu(menu);
menu.add(0, intMenu_Exit, 0, R.string.menu_exit).setIcon(R.drawable.ic_quit);
SubMenu optionsMenu = menu.addSubMenu("Options").setIcon(R.drawable.ic_prefs);
//optionsMenu.add(0, intMenu_Prefs, 0, R.string.menu_pref);
optionsMenu.add(0, intMenu_Eval, 0, R.string.menu_eval);
optionsMenu.add(1, intMenu_Refresh, 0, R.string.menu_refresh);
optionsMenu.add(2, intMenu_Clear_Cache, 0, R.string.menu_clear_cache);
return result;
}
//gestion du menu
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
//clic sur le menu contact
//clic sur menu sortie
case intMenu_Exit:
kill();
return true;
case intMenu_Prefs:
Intent intent = new Intent(MainActivity.this, PrefsActivity.class);
startActivity(intent);
return true;
case intMenu_Clear_Cache:
delCache();
return true;
case intMenu_Eval:
Activity activity = MainActivity.this; // récupération de l'Activity courante
Command commandeOui = new Command() {
public void execute() {
Intent intent2 =new Intent(Intent.ACTION_VIEW);
intent2.setData(Uri.parse("market://details?id=com.chronocarpe.chronocarpe"));
startActivity(intent2);
}
};
displayYesNoDialog(activity, "Vous allez être redirigé vers le PlayStore de Google.", commandeOui);
return true;
case intMenu_Refresh:
webview.reload();
return true;
}
return super.onOptionsItemSelected(item);
}
/***************************************************Internet********************************************/
//Vu du navigateur internet
private class WWWViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
//interface Javascript
@SuppressLint("ParserError")
class JSInterface {
@SuppressLint("ParserError")
/** Show a toast from the web page */
public void menu_plus_show() {
menu_plus=1;
}
public void menu_plus_hide() {
menu_plus=0;
}
public void action_wait() {
startProgressDialog.dismiss();
myProgressDialog = ProgressDialog.show(MainActivity.this, "", "Chargement de la page en cours...", true);
}
public void action_wait_stop() {
myProgressDialog.dismiss();
}
public void alert(String msg) {
//startProgressDialog.dismiss();
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage(msg);
builder.setNegativeButton("Fermer", null);
builder.show();
//myProgressDialog = ProgressDialog.show(MainActivity.this, "",msg, true);
}
}
//Test connectivité
public boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
}
return false;
}
/***************************************************Boite de dialogue********************************************/
public void displayYesNoDialog(Activity context, String string,
Command commandeOui) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setMessage(string);
builder.setNegativeButton("Annuler", null);
builder.setPositiveButton("Accéder", commandeOui);
builder.show();
}
abstract public class Command implements DialogInterface.OnClickListener {
public final void onClick(DialogInterface dialog, int which) {
execute();
dialog.dismiss();
}
abstract public void execute();
}
}
LAYOUT main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:animateLayoutChanges="true"
android:orientation="horizontal"
android:overScrollMode="never"
android:scrollbarAlwaysDrawVerticalTrack="false"
android:scrollbarStyle="insideOverlay"
android:scrollbars="none" >
<WebView
android:id="@+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:overScrollMode="never"
android:scrollbarAlwaysDrawVerticalTrack="false"
android:scrollbars="none" />
</LinearLayout>
PrefsActivity.java:
package android.linux.webview;
import android.app.Activity;
import android.os.Bundle;
public class PrefsActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.prefs);
}
}
LAYOUT prefs.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<CheckBox
android:id="@+id/checkBox2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
VALUES strings.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="co_name">BeHuman</string>
<string name="url_co">http://www.ckdevelop.org</string>
<string name="app_name">BeHuman</string>
<string name="url_app">http://www.ckdevelop.org</string>
<string name="menu_exit">Fermer</string>
<string name="menu_pref">Préférences</string>
<string name="menu_refresh">Rafraîchir</string>
<string name="menu_clear_cache">Vider le cache</string>
<string name="menu_eval">Évaluer l\'application</string>
</resources>
VALUES styles.xml:
<resources>
<style name="AppTheme" parent="android:Theme.Light" />
</resources>