Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 *  Copyright (C) 2012 Hyperionics Technology LLC <http://www.hyperionics.com>
 *
 *  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.
 */

import android.app.Application;

import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;

import java.io.*;

import java.lang.reflect.Method;

public class Main {
    private static Application myApp = getApp();

    public static boolean setApp(Application app) {
        myApp = app;
        getFirstInstalled(); // to initialize timestamp file on old versions of Android
        return true;
    }

    public static long getFirstInstalled() {
        long firstInstalled = 0;
        PackageManager pm = myApp.getPackageManager();
        try {
            PackageInfo pi = pm.getPackageInfo(myApp.getApplicationContext().getPackageName(), pm.GET_SIGNATURES);
            try {
                try {
                    //noinspection AndroidLintNewApi
                    firstInstalled = pi.firstInstallTime;
                } catch (NoSuchFieldError e) {
                }
            } catch (Exception ee) {
            }
            if (firstInstalled == 0) { // old versions of Android don't have firstInstallTime in PackageInfo
                File dir;
                try {
                    dir = new File(
                            getApp().getApplicationContext().getExternalCacheDir().getAbsolutePath() + "/.config");
                } catch (Exception e) {
                    dir = null;
                }
                if (dir != null && (dir.exists() || dir.mkdirs())) {
                    File fTimeStamp = new File(dir.getAbsolutePath() + "/.myconfig");
                    if (fTimeStamp.exists()) {
                        firstInstalled = fTimeStamp.lastModified();
                    } else {
                        // create this file - to make it slightly more confusing, write the signature there
                        OutputStream out;
                        try {
                            out = new FileOutputStream(fTimeStamp);
                            out.write(pi.signatures[0].toByteArray());
                            out.flush();
                            out.close();
                        } catch (Exception e) {
                        }
                    }
                }
            }
        } catch (PackageManager.NameNotFoundException e) {
        }
        return firstInstalled;
    }

    public static Application getApp() {
        if (myApp == null) {
            try {
                final Class<?> activityThreadClass = Class.forName("android.app.ActivityThread");
                final Method method = activityThreadClass.getMethod("currentApplication");
                myApp = (Application) method.invoke(null, (Object[]) null);
            } catch (Exception e) {
                // handle exception
            }
        }
        // below gives me /mnt/sdcard/Android/data/com.hyperionics.pdfxTest/cache/tmpPdfx
        // File file = new File(app.getApplicationContext().getExternalCacheDir(), "tmpPdfx");
        return myApp;
    }
}