从资产文件夹复制到SD卡复制 [英] Copying from asset folder to SD card

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问题描述

我不知道什么是错的这个code?它创建于SD卡,但以0字节的文件..
你可以查看一下,告诉我什么问题呢?

下面我试图复制从资源文件夹的文件位于codes.db到SD卡。

  AssetManager assetManager = getResources()getAssets()。
    在的InputStream = NULL;    出的OutputStream = NULL;
    BUF的BufferedInputStream = NULL;
    尝试{
        在= assetManager.open(codes.db);    }赶上(IOException异常五){
        // TODO自动生成catch块
        的System.out.println(错误JH:+ e.getMessage());
    }
    如果(在!= NULL){
        尝试{
            OUT =新的FileOutputStream(/ SD卡/+codes.db);
        }赶上(FileNotFoundException异常五){
            // TODO自动生成catch块
            的System.out.println(错误行:+ e.getLocalizedMessage());
        }
    }    的System.out.println(IN值:+的);
    的System.out.println(OUT值:+ OUT);
    INT chunkBytes = 0;
    字节[] = outputByte新的字节[1024];    如果(在= NULL和放大器;!&安培;!OUT = NULL){
        尝试{            //而((chunkBytes = in.read(outputByte,0,1024))!= -1){
            而((chunkBytes = in.read())!= - 1){
                //写入内容文件
                的System.out.println(我为在这里);
                // out.write(outputByte,0,(int)的chunkBytes);
                out.write(chunkBytes);
                //发布下载进度..
            }
        }赶上(例外五){
            // TODO自动生成catch块
            的System.out.println(错误的位置:
                    + e.getLocalizedMessage()的toString());
        }
    }    尝试{
        附寄();
        out.close();
    }赶上(IOException异常五){
        // TODO自动生成catch块
        的System.out.println(错误有:+ e.getLocalizedMessage());
    }}

我收到此错误在所有的情况下,我确定我有我的权限集... SD卡codes.db为0字节...:(

 九月五日至24日:59:34.221:W / System.err的(5559):java.io.IOException异常
9月5日至24日:59:34.221:W / System.err的(5559):在android.content.res.AssetManager.readAsset(本机方法)
9月5日至24日:59:34.221:W / System.err的(5559):在android.content.res.AssetManager.access $ 700(AssetManager.java:36)
9月5日至24日:59:34.221:W / System.err的(5559):在android.content.res.AssetManager $ AssetInputStream.read(AssetManager.java:571)
9月5日至24日:59:34.221:W / System.err的(5559):在com.bewo.copy.TestCopyActivity.copyStream(TestCopyActivity.java:136)
9月5日至24日:59:34.221:W / System.err的(5559):在com.bewo.copy.TestCopyActivity.onCreate(TestCopyActivity.java:19)
9月5日至24日:59:34.221:W / System.err的(5559):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
9月5日至24日:59:34.221:W / System.err的(5559):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2635)
9月5日至24日:59:34.221:W / System.err的(5559):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2687)
9月5日至24日:59:34.221:W / System.err的(5559):在android.app.ActivityThread.access $ 2300(ActivityThread.java:127)
9月5日至24日:59:34.221:W / System.err的(5559):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:2035)
9月5日至24日:59:34.221:W / System.err的(5559):在android.os.Handler.dispatchMessage(Handler.java:99)
9月5日至24日:59:34.221:W / System.err的(5559):在android.os.Looper.loop(Looper.java:123)
9月5日至24日:59:34.221:W / System.err的(5559):在android.app.ActivityThread.main(ActivityThread.java:4635)
9月5日至24日:59:34.221:W / System.err的(5559):在java.lang.reflect.Method.invokeNative(本机方法)
9月5日至24日:59:34.221:W / System.err的(5559):在java.lang.reflect.Method.invoke(Method.java:521)
9月5日至24日:59:34.221:W / System.err的(5559):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:860)
9月5日至24日:59:34.221:W / System.err的(5559):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
9月5日至24日:59:34.221:W / System.err的(5559):在dalvik.system.NativeStart.main(母语


解决方案

许多搜索之后,我只是想我可以在一个线程以后使用的方法,这里是我在用我的应用程序:

 的静态公共无效copyFileFromAssets(上下文的背景下,字符串文件,字符串DEST)抛出异常
{
    在的InputStream = NULL;
    OutputStream的FOUT = NULL;
    诠释计数= 0;    尝试
    {
        在= context.getAssets()打开(文件)。
        FOUT =新的FileOutputStream(新文件(DEST));        字节的数据[] =新的字节[1024];
        而((计数= in.read(数据,0,1024))!= -1)
        {
            fout.write(数据0,计);
        }
    }
    赶上(例外五)
    {
        e.printStackTrace();
    }
    最后
    {
        如果(在!= NULL)
        {
            尝试{
                附寄();
            }赶上(IOException异常E)
            {
            }
        }
        如果(FOUT!= NULL)
        {
            尝试{
                fout.close();
            }赶上(IOException异常五){
            }
        }
    }
}

请让我知道如果这有助于!

I am not sure what is wrong with this code? It creates a file in SD card but with 0 byte.. Can one of you look into it and tell me whats wrong with this?

Here i am trying to copy a file from asset folder which is codes.db to sd card..

    AssetManager assetManager = getResources().getAssets();
    InputStream in = null;

    OutputStream out = null;
    BufferedInputStream buf = null;
    try {
        in = assetManager.open("codes.db");

    } catch (IOException e) {
        // TODO Auto-generated catch block
        System.out.println("Error jh: " + e.getMessage());
    }
    if (in != null) {
        try {
            out = new FileOutputStream("/sdcard/" + "codes.db");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            System.out.println("Error Line : " + e.getLocalizedMessage());
        }
    }

    System.out.println("IN VALUE : " + in);
    System.out.println("OUT VALUE : " + out);


    int chunkBytes = 0;
    byte[] outputByte = new byte[1024];

    if (in != null && out != null) {
        try {

            // while ((chunkBytes = in.read(outputByte, 0, 1024)) != -1) {
            while ((chunkBytes = in.read()) != -1) {
                // write contents to the file
                System.out.println("I m here");
                // out.write(outputByte, 0, (int) chunkBytes);
                out.write(chunkBytes);
                // publish the progress of downloading..
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            System.out.println("Error here: "
                    + e.getLocalizedMessage().toString());
        }
    }

    try {
        in.close();
        out.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        System.out.println("Error there: " + e.getLocalizedMessage());
    }

}

I am getting this error in all the case.. i am sure i have my permission set... codes.db in sd card is 0 byte... :(

05-24 09:59:34.221: W/System.err(5559): java.io.IOException
05-24 09:59:34.221: W/System.err(5559):     at android.content.res.AssetManager.readAsset(Native Method)
05-24 09:59:34.221: W/System.err(5559):     at android.content.res.AssetManager.access$700(AssetManager.java:36)
05-24 09:59:34.221: W/System.err(5559):     at android.content.res.AssetManager$AssetInputStream.read(AssetManager.java:571)
05-24 09:59:34.221: W/System.err(5559):     at com.bewo.copy.TestCopyActivity.copyStream(TestCopyActivity.java:136)
05-24 09:59:34.221: W/System.err(5559):     at com.bewo.copy.TestCopyActivity.onCreate(TestCopyActivity.java:19)
05-24 09:59:34.221: W/System.err(5559):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-24 09:59:34.221: W/System.err(5559):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2635)
05-24 09:59:34.221: W/System.err(5559):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2687)
05-24 09:59:34.221: W/System.err(5559):     at android.app.ActivityThread.access$2300(ActivityThread.java:127)
05-24 09:59:34.221: W/System.err(5559):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2035)
05-24 09:59:34.221: W/System.err(5559):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-24 09:59:34.221: W/System.err(5559):     at android.os.Looper.loop(Looper.java:123)
05-24 09:59:34.221: W/System.err(5559):     at android.app.ActivityThread.main(ActivityThread.java:4635)
05-24 09:59:34.221: W/System.err(5559):     at java.lang.reflect.Method.invokeNative(Native Method)
05-24 09:59:34.221: W/System.err(5559):     at java.lang.reflect.Method.invoke(Method.java:521)
05-24 09:59:34.221: W/System.err(5559):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
05-24 09:59:34.221: W/System.err(5559):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
05-24 09:59:34.221: W/System.err(5559):     at dalvik.system.NativeStart.main(Native

解决方案

After many searches, I simply wanted a method I could use in a thread later on, here is what I am using for my application:

static public void copyFileFromAssets(Context context, String file, String dest) throws Exception 
{
    InputStream in = null;
    OutputStream fout = null;
    int count = 0;

    try
    {
        in = context.getAssets().open(file);
        fout = new FileOutputStream(new File(dest));

        byte data[] = new byte[1024];
        while ((count = in.read(data, 0, 1024)) != -1)
        {
            fout.write(data, 0, count);
        }
    }
    catch (Exception e) 
    {
        e.printStackTrace();
    }   
    finally
    {
        if (in != null)
        {
            try {
                in.close();
            } catch (IOException e) 
            {
            }
        }
        if (fout != null)
        {
            try {
                fout.close();
            } catch (IOException e) {
            }
        }
    }
}

Please let me know if this helps!

这篇关于从资产文件夹复制到SD卡复制的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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