Question

我正在尝试创建一个下载pdf并保存它的函数，我正在使用以下代码。

public class DownloadFile extends AsyncTask<String, Void, Void> {

    @Override
    protected Void doInBackground(String... strings) {
        String fileUrl = strings[0];   // -> http://maven.apache.org/maven-1.x/maven.pdf
        String fileName = strings[1];  // -> maven.pdf
        String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
        File folder = new File(extStorageDirectory, "testthreepdf");
        folder.mkdir();

        File pdfFile = new File(folder, fileName);

        try{
            pdfFile.createNewFile();
        }catch (IOException e){
            e.printStackTrace();
        }
        FileDownloader.downloadFile(fileUrl, pdfFile);
        return null;
    }
}

大约60％的时间都可以正常工作，但有时会在线上：

File pdfFile = new File(folder, fileName);

它崩溃了应用程序，当我再次尝试它然后工作。它抛出的错误并没有那么有用

执行doInBackground()

时发生错误

堆栈跟踪：

08-17 15:08:48.097 27281-27317/com.heyjude.heyjudeapp W/System.err: mkdir failed: EEXIST (File exists) : /storage/emulated/0/testthreepdf
08-17 15:09:36.807 27281-27311/com.heyjude.heyjudeapp I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
08-17 15:09:36.847 27281-27311/com.heyjude.heyjudeapp I/System.out: KnoxVpnUidStorageknoxVpnSupported API value returned is false
08-17 15:09:36.877 27281-27311/com.heyjude.heyjudeapp I/System.out: KnoxVpnUidStorageknoxVpnSupported API value returned is false

创建导致崩溃的文件android

0 个答案: