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我正在按照本指南教程在我的 android 应用程序中创建获取数据库函数

这是类似的问题,但对他来说,问题是 url 不是文件,而是目录。

当我的应用程序运行时,它需要从我的本地服务器自动下载一个数据库文件,我192.168.1.150/db/wifin.db从我的浏览器下载文件中测试正确,但我的应用程序只能获得一个具有正确名称的空数据库。

感慨:因为这个问题,让我的程序在空sqlite表上出现空异常

这是我的代码。

public void createDataBase() throws IOException{
    this.getReadableDatabase();
    try{
        copyDataBase();}
    catch (IOException e){
        throw new Error("Error copying database");}
}

private void copyDataBase() throws IOException{

        //url of my webserver link point to my db
        Thread dx = new Thread() {
            public void run(){
                try{

                    URL url = new URL("192.168.1.150/db/wifin.db");

                    //open a connection
                    URLConnection connection = url.openConnection();

                    connection.connect();

                    //Open your local db as the input stream
                    InputStream input = new BufferedInputStream(url.openStream());

                    // Path to the just created empty db
                    String outFileName = DB_PATH + DB_NAME;

                    //Open the empty db as the output stream
                    OutputStream output = new FileOutputStream(outFileName);

                    //transfer bytes from the inputfile to the outputfile
                    byte data[] = new byte[1024];
                    long total = 0;
                    int count;
                    while ((count = input.read(data)) != -1) {
                    total += count;
                    output.write(data, 0, count);
                }

                output.flush();
                output.close();
                input.close();}
                catch (Exception e)
                {
                    e.printStackTrace();
                    Log.i("ERROR ON DOWNLOADING FILES", "ERROR IS" +e);
                }
            }
        };
        dx.start();
}

这是猫日志

10-13 22:41:34.527: W/System.err(28533): java.net.MalformedURLException: Protocol not found: 192.168.1.150/db/wifin.db
10-13 22:41:34.527: W/System.err(28533):    at java.net.URL.<init>(URL.java:178)
10-13 22:41:34.527: W/System.err(28533):    at java.net.URL.<init>(URL.java:127)
10-13 22:41:34.527: W/System.err(28533):    at com.example.Wifin.DataBaseHelper$1.run(DataBaseHelper.java:110)
10-13 22:41:34.537: I/ERROR ON DOWNLOADING FILES(28533): ERROR ISjava.net.MalformedURLException: Protocol not found: 192.168.1.150/db/wifin.db
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1 回答 1

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将其更改为URL url = new URL("http://192.168.1.150/db/wifin.db"); 并删除连接.连接(); 这将有效

于 2013-10-13T15:19:55.107 回答