在外部存储的Andr​​oid无法创建文件 [英] Impossible to create file on external storage Android

问题描述

我想创建一个文本文件，并将其存储在Android手机上的外部存储。我添加的权限，我的Andr​​oid清单。当我运行code它并没有给我任何错误，但该文件是永远不会创建。不知道我做错了。

 公共无效createExternalStoragePrivateFile（字符串数据）{
    //创建一个路径，我们将放置在外部我们的私人文件
    // 存储。
    档案文件=新的文件（myContext.getExternalFilesDir（空），state.txt）;

    尝试 {

        FileOutputStream中OS = NULL;
        OutputStreamWriter了= NULL;
        OS = myContext.openFileOutput（数据，Context.MODE_PRIVATE）;
        OUT =新OutputStreamWriter（OS）;
        out.write（数据）;
        os.close（）;

        如果（hasExternalStoragePrivateFile（））{
            Log.w（ExternalStorageFileCreation，文件创建）;
        } 其他 {
            Log.w（ExternalStorageFileCreation，文件未创建）;
        }

    }赶上（IOException异常E）{
        //无法创建文件，很可能是因为外部存储
        //当前未安装。
        Log.w（ExternalStorage，写入+文件，E）;
    }
}
 

解决方案

 档案文件=新的文件（myContext.getExternalFilesDir（空），state.txt）;
尝试 {

     FileOutputStream中OS =新的FileOutputStream（文件，真正的）;
     OutputStreamWriter OUT =新OutputStreamWriter（OS）;
         out.write（数据）;
     out.close（）;
}
 

I want to create a .txt file and store it on the external storage of the Android phone. I added the permission to my Android Manifest. When I run the code it doesn't give me any error but the file is never created. Not sure what I am doing wrong.

public void createExternalStoragePrivateFile(String data) {
    // Create a path where we will place our private file on external
    // storage.
    File file = new File(myContext.getExternalFilesDir(null), "state.txt");

    try {

        FileOutputStream os = null; 
        OutputStreamWriter out = null;
        os = myContext.openFileOutput(data, Context.MODE_PRIVATE);
        out = new OutputStreamWriter(os);
        out.write(data);
        os.close();

        if(hasExternalStoragePrivateFile()) {
            Log.w("ExternalStorageFileCreation", "File Created");
        } else {
            Log.w("ExternalStorageFileCreation", "File Not Created");
        }

    } catch (IOException e) {
        // Unable to create file, likely because external storage is
        // not currently mounted.
        Log.w("ExternalStorage", "Error writing " + file, e);
    }
}

解决方案

File file = new File(myContext.getExternalFilesDir(null), "state.txt");
try {

     FileOutputStream os = new FileOutputStream(file, true); 
     OutputStreamWriter out = new OutputStreamWriter(os);
         out.write(data);
     out.close();
}

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