数据目录在Android中没有读/写权限

Data directory has no read/write permission in Android(数据目录在Android中没有读/写权限)

问题描述

我使用的是 Android 1.5 我的数据目录没有读/写权限

I m using Android 1.5 my data directory doesn't have the read/write permissions

System.out.println("DAta can write??--->"+Environment.getDataDirectory().canWrite());
System.out.println("DAta can read??--->"+Environment.getDataDirectory().canRead());

所以请建议我如何为数据目录提供权限.

So please suggest me how to provide permissions for the data directory.

我要做的是创建一个文件并在模拟器的数据存储中添加一些内容，如下所示

What I'm trying to do is to create a file and add some content to it in the Data storage of the emulator like as below

private void writeToSDCard() {
        try {

            File lroot = Environment.getDataDirectory();

            if (lroot.canWrite()){
                File lfile = new File(lroot, "samplefile.txt");
                FileWriter lfilewriter = new FileWriter(lfile);
                BufferedWriter lout = new BufferedWriter(lfilewriter);
                lout.write("XXXXXXXXXXXXXXXXXX");
                lout.close();
            }
        } catch (IOException e) {
            Log.e(m_cTAG, "Could not write file " + e.getMessage());
        }
    }

推荐答案

您不应该查看数据目录.这是手机存储中的系统目录 - 通常是 /data - 您的应用程序永远不会有写入权限.

You shouldn't be looking at the Data Directory. This is a system directory in the phone's storage - usually /data - and your application will never have permission to write to it.

您的应用程序应该写入文件的目录由 返回Context.getFilesDir() 方法.它将类似于 /data/data/com.yourdomain.YourApp/files.

The directory your application should write files to is returned by the Context.getFilesDir() method. It will be something like /data/data/com.yourdomain.YourApp/files.

如果您想写入手机存储中的文件，请使用 Context.openFileOutput() 方法.

If you want to write to a file in the phone's storage use the Context.openFileOutput() method.

如果您想要 SDCard 的路径，请使用 Environment.getExternalStorageDirectory() 方法.要写入 SDCard，您需要通过将以下内容添加到您的 Manifest 来为您的应用程序授予适当的权限:

If you want the path to the SDCard then use Environment.getExternalStorageDirectory() method. To write to the SDCard you'll need to give your application the appropriate permissions by adding the following to your Manifest:

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

如果您要写入 SDCard，您还需要使用 getExternalStorageState() 方法检查其状态.

If you're going to write to the SDCard you'll also need to check its state with the getExternalStorageState() method.

如果您要存储与应用程序相关的小文件，那么这些文件可以进入手机的存储空间而不是 SD 卡，因此请使用 Context.openFileOutput() 和 Context.openFileInput() 方法.

If you're storing small files to do with your application then these can go into the phone's storage and not the SD Card, so use the Context.openFileOutput() and Context.openFileInput() methods.

所以在您的代码中考虑如下内容:

So in your code consider something like:

OutputStream os = openFileOutput("samplefile.txt", MODE_PRIVATE);
BufferedWriter lout = new BufferedWriter(new OutputStreamWriter(os));

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