Question

如何使用Java将数据库从/data/data/my.package.name/databases/复制到/mnt/shared文件夹？

我尝试使用FileOutputStream，但获得open failed: EACCES (Permission denied)

Answer 1

使用此：

public void writeToSDCard() throws IOException {


        System.out.println("Write To Sd");
        File f=new File("/data/data/com.yourpackage/databases/dbname");
        FileInputStream fis=null;
        FileOutputStream fos=null;

        try{
            fis=new FileInputStream(f);


            fos=new FileOutputStream("/mnt/sdcard/dumped.db");
            while(true){
                int i=fis.read();
                if(i!=-1){
                    fos.write(i);
                }
                else{
                    break;
                }
            }
            fos.flush();

        }
        catch(Exception e){
            e.printStackTrace();

        }
        finally{
            try{
                fos.close();
                fis.close();
            }
            catch(IOException ioe){
                //      System.out.println(ioe);
            }
        }

        System.out.println("Wrote to Sd");
    }

在Manifest中添加所需的权限。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Answer 2

我能够找到问题的解决方案。需要手机的根。

public static void copyDb() {
    try {
        String command = "cp -r /data/data/my.package.name/databases/ /mnt/shared/";
        Process suProcess = Runtime.getRuntime().exec("su");
        DataOutputStream os = new DataOutputStream(suProcess.getOutputStream());
        os.writeBytes("chmod 777 " + sharedFolder + " \n");
        os.flush();
        os.writeBytes(command + "\n");
        os.flush();
        os.writeBytes("exit\n");
        os.flush();
        suProcess.waitFor();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

Android复制数据库到mnt / shared

2 个答案: