Ho creato questa semplice implementazione per la licenza d'uso, ho preso spunto dal codice di MyTracks (se non erro) e ho aggiunto un controllo sulla versione della APP in modo da rivisualizzare ogni volta che la app si aggiorna.
Ho finito ora, quindi spero di non aver sbagliato niente
Attendo impaziente feedback e consigli ^_^
src/[package].Eula.java/*
* Copyright (C) 2008 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 it.zonde.android;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.util.Log;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.Closeable;
/**
* Displays an EULA ("End User License Agreement") that the user has to accept before
* using the application. Your application should call {@link Eula#show(android.app.Activity)}
* in the onCreate() method of the first activity. If the user accepts the EULA, it will never
* be shown again. If the user refuses, {@link android.app.Activity#finish()} is invoked
* on your activity.
*/
class Eula {
private static final String ASSET_EULA = "EULA"; //Filename of EULA File
private static final String PREFERENCES_EULA = "eula";
private static final String APP_VERSION = "app.version";
private static final String PREFERENCE_EULA_ACCEPTED = "eula.accepted";
protected static PackageInfo pi = null;
public Eula() {
}
static private void getPackageInfo(final Activity activity) {
try {
pi = activity.getPackageManager().getPackageInfo(activity.getPackageName(), PackageManager.GET_ACTIVITIES);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
}
/**
* callback to let the activity know when the user has accepted the EULA.
*/
static interface OnEulaAgreedTo {
/**
* Called when the user has accepted the eula and the dialog closes.
*/
void onEulaAgreedTo();
}
/**
* Displays the EULA if necessary. This method should be called from the onCreate()
* method of your main Activity.
*
* @param activity The Activity to finish if the user rejects the EULA.
* @return Whether the user has agreed already.
*/
static boolean show(final Activity activity) {
getPackageInfo(activity);
final SharedPreferences preferences = activity.getSharedPreferences(PREFERENCES_EULA, Activity.MODE_PRIVATE);
if (!preferences.getBoolean(PREFERENCE_EULA_ACCEPTED, false) || (!pi.versionName.equalsIgnoreCase(preferences.getString(APP_VERSION, "")))) {
final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle(activity.getResources().getString(R.string.eula_title)+" v."+pi.versionName);
builder.setCancelable(true);
builder.setPositiveButton(R.string.eula_accept, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
accept(preferences);
if (activity instanceof OnEulaAgreedTo) {
((OnEulaAgreedTo) activity).onEulaAgreedTo();
}
}
});
builder.setNegativeButton(R.string.eula_refuse, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
refuse(preferences, activity);
}
});
builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
public void onCancel(DialogInterface dialog) {
refuse(preferences, activity);
}
});
builder.setMessage(readEula(activity));
builder.create().show();
return false;
}
return true;
}
private static void accept(SharedPreferences preferences) {
preferences.edit().putBoolean(PREFERENCE_EULA_ACCEPTED, true).commit();
preferences.edit().putString(APP_VERSION, pi.versionName).commit();
}
private static void refuse(SharedPreferences preferences, Activity activity) {
preferences.edit().putBoolean(PREFERENCE_EULA_ACCEPTED, false).commit();
activity.finish();
}
protected static CharSequence readEula(Activity activity) {
BufferedReader in = null;
try {
String assetPath = activity.getResources().getString(R.string.subpath);
in = new BufferedReader(new InputStreamReader(activity.getAssets().open(assetPath+"/"+ASSET_EULA)));
String line;
StringBuilder buffer = new StringBuilder();
while ((line = in.readLine()) != null) buffer.append(line).append('\n');
return buffer;
} catch (IOException e) {
return "";
} finally {
closeStream(in);
}
}
/**
* Closes the specified stream.
*
* @param stream The stream to close.
*/
private static void closeStream(Closeable stream) {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
// Ignore
}
}
}
} assets/[LANGUAGE FOLDER]/EULAUn semplicissimo file di testo con la vostra EULA, create una cartella in assets per ogni lignua che volete gestire con il relativo file EULADistinguete i vari path della cartella in base alla lingua
values-[LANG]/strings.xml <string name="eula_title">License</string>
<string name="eula_accept">Accept</string>
<string name="eula_refuse">Decline</string>
<string name="subpath">en</string>Per usarlo
MainActivity.javapublic void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Eula.show(this);
