写入SDCard文件无异常失败

发布于 2024-12-01 16:44:03 字数 1393 浏览 2 评论 0原文

我已经经历了有关 SD 卡文件写入问题的多个线程，但找不到对我有帮助的答案。

我已经

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

在我的节点清单中使用了。

2. 以下代码创建一个文件，但不写入该文件。 Writer 也从不抛出异常。当我返回 SDCard 并看到创建的文件为 0 kb 时。（这是由于createnew函数）
3. SDCard显示使用这些权限创建的文件----rwxr-x（其他人不存在写入）
4. 该行为在模拟器或 ASUS pad 或 Acer Iconia 设备等设备上是相同的。

应用程序从 Android 应用程序创建包含 SDCard 内容的文件的常规方式是什么？

if(isExternalStorageWritable()) {
    File testFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath(),Filename);
    try {
        if (testFile.createNewFile()) {
            Log.i(TAG + ": createSdcardFile","Empty file on external storage created");
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
                   openFileOutput(Filename, MODE_APPEND)));
            out.write(Content);
            out.close();
            Log.i(TAG + ": createSdcardFile","Content to new file created");
            created = true;
        }
    } catch(IOException e) {
        Log.e(TAG,"Unable to create/write to new file on external storage. Terminating testCDMReadPositive");
        Log.e(TAG,e.getMessage());
    }
}

4.使用模式MODE_WORLD_WRITABLE给出相同的结果，即SDCard上的0kb文件

5. 任何有在外部存储（/mnt/sdcard）上写入文件经验的人都会知道如何做到这一点。任何帮助或指导，高度赞赏。谢谢

原文

I have gone through multiple threads about SDcard file writing problems, but could not see a answer that would help me.

I have used

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

in my manifest for node.

2. Following code creates a file but doesn't write to it. Writer never throws an exception either. When I go back to SDCard and see the file created is of 0 kb. ( which is due to createnew function)
3. SDCard shows the file created with these permissions ----rwxr-x ( write not being there for others )
4. The behaviour is same on emulator or devices liek ASUS pad or Acer Iconia devices.

What is the regular way applications create files with content on SDCard from an Android application ?

if(isExternalStorageWritable()) {
    File testFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath(),Filename);
    try {
        if (testFile.createNewFile()) {
            Log.i(TAG + ": createSdcardFile","Empty file on external storage created");
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
                   openFileOutput(Filename, MODE_APPEND)));
            out.write(Content);
            out.close();
            Log.i(TAG + ": createSdcardFile","Content to new file created");
            created = true;
        }
    } catch(IOException e) {
        Log.e(TAG,"Unable to create/write to new file on external storage. Terminating testCDMReadPositive");
        Log.e(TAG,e.getMessage());
    }
}

4.Using mode MODE_WORLD_WRITABLE gives same result i.e. a 0kb file on SDCard

5. Anyone with experience in writing files on externalstorage ( /mnt/sdcard ) would know how to do this. Any help or direction, highly appreciated. Thank you

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