Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2010 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.
 */

import android.content.Context;

import android.net.Uri;

import java.io.FileInputStream;
import java.io.FileNotFoundException;

import java.io.IOException;
import java.io.InputStream;

import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class Main {
    static InputStream openContentInputStream(Context context, Uri uri) {
        try {
            return context.getContentResolver().openInputStream(uri);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static InputStream openInputStream(Context context, Uri uri) {
        if (null == uri)
            return null;
        String scheme = uri.getScheme();
        InputStream stream = null;
        if ((scheme == null) || ("file".equals(scheme))) {
            stream = openFileInputStream(uri.getPath());
        } else if ("content".equals(scheme)) {
            stream = openContentInputStream(context, uri);
        } else if (("http".equals(scheme)) || ("https".equals(scheme))) {
            stream = openRemoteInputStream(uri);
        }
        return stream;
    }

    static InputStream openFileInputStream(String path) {
        try {
            return new FileInputStream(path);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    static InputStream openRemoteInputStream(Uri uri) {
        URL finalUrl;
        try {
            finalUrl = new URL(uri.toString());
        } catch (MalformedURLException e) {
            e.printStackTrace();
            return null;
        }
        HttpURLConnection connection;
        try {
            connection = (HttpURLConnection) finalUrl.openConnection();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }

        connection.setInstanceFollowRedirects(false);
        int code;
        try {
            code = connection.getResponseCode();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }

        if ((code == 301) || (code == 302) || (code == 303)) {
            String newLocation = connection.getHeaderField("Location");
            return openRemoteInputStream(Uri.parse(newLocation));
        }
        try {
            return (InputStream) finalUrl.getContent();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}