10

我正在使用以下代码和 apache commons 库将一个文件(临时音频文件)从源文件夹复制到目标文件夹作为 TT_1A。

代码:

button1_save.setOnClickListener(new OnClickListener() 
    {
        public void onClick(View v) 
        {
            String sourcePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/TT/tt_temp.3gp";
            File source = new File(sourcePath);

            String descPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/TT/tt_1A.3gp";
            File desc = new File(descPath);
            try 
            {
                FileUtils.copyDirectory(source, desc);
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
            }
        }
    }); 

阿帕奇共享:

http://commons.apache.org/proper/commons-io/download_io.cgi

问题:

我已经使用该FileUtils功能来复制临时文件并粘贴到 desc 文件夹作为 TT_1A。然而 logcat 报告错误并包含以下详细信息:

10-17 00:41:04.260: E/AndroidRuntime(27450): FATAL EXCEPTION: main
10-17 00:41:04.260: E/AndroidRuntime(27450): java.lang.NoClassDefFoundError: org.apache.commons.io.FileUtils
10-17 00:41:04.260: E/AndroidRuntime(27450):    at com.abc.abc.TT_details_canton$14.onClick(TT_details_canton.java:575)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at android.view.View.performClick(View.java:4223)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at android.view.View$PerformClick.run(View.java:17275)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at android.os.Handler.handleCallback(Handler.java:615)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at android.os.Handler.dispatchMessage(Handler.java:92)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at android.os.Looper.loop(Looper.java:137)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at android.app.ActivityThread.main(ActivityThread.java:4898)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at java.lang.reflect.Method.invokeNative(Native Method)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at java.lang.reflect.Method.invoke(Method.java:511)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
10-17 00:41:04.260: E/AndroidRuntime(27450):    at dalvik.system.NativeStart.main(Native Method)

我整晚都坚持这一点。有没有办法复制文件??

4

2 回答 2

36

通过以下方式修改后运行良好:

    button1_save.setOnClickListener(new OnClickListener() 
    {
        public void onClick(View v) 
        {
            String sourcePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/TongueTwister/tt_temp.3gp";
            File source = new File(sourcePath);

            String destinationPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/TongueTwister/tt_1A.3gp";
            File destination = new File(destinationPath);
            try 
            {
                FileUtils.copyFile(source, destination);
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
            }
        }
    }); 
于 2013-10-16T17:02:07.863 回答
2

在 API 级别 29 中,android 增加了FileUtils类,该类具有复制功能。

使用此代码复制您的文件:-

public void copyFile(File source, File destination) throws IOException {
    FileUtils.copy(new FileInputStream(source), new FileOutputStream(destination));
}

如果 Android Studio 没有找到FileUtils类,这意味着你的 compileSdkVersion 低于 29,在这种情况下,你必须升级你的 compileSdkVersion。

要升级,请转到您的应用程序级 build.gradle 文件并将旧的compileSdkVersion替换为29

像这样

compileSdkVersion 29

有关FileUtils类的更多信息,请访问 Android 开发者网站 https://developer.android.com/reference/android/os/FileUtils

于 2020-04-13T13:42:45.427 回答