Android：如何从外部存储中删除文件？

Question

I am implementing an application which generates and create files in External storage. How can I remove that?

Edit

I added following code and still I am getting the same problem. See my code below:

String fullPath = "/mnt/sdcard/";
System.out.println(fullPath);
try{
    File file = new File(fullPath, "audio.mp3");
    if(file.exists()){
        boolean result = file.delete();
        System.out.println("Application able to delete the file and result is: " + result);
        // file.delete();
    }else{
        System.out.println("Application doesn't able to delete the file");
    }
}catch (Exception e){
    Log.e("App", "Exception while deleting file " + e.getMessage());
}

In the LogCat I am getting Application able to delete the file and result is:false . I attached my screen shot after executing this.

Answer 1

File file = new File(selectedFilePath);
boolean deleted = file.delete();

where selectedFilePath is the path of the file you want to delete - for example:

/sdcard/YourCustomDirectory/ExampleFile.mp3

Answer 2

This is another way just pass your directory name to delete content of it

ex "/sdcard/abc/yourdata"

public void deleteFiles(String path) {      
    File file = new File(path);

    if (file.exists()) {
        String deleteCmd = "rm -r " + path;
        Runtime runtime = Runtime.getRuntime();
        try {
            runtime.exec(deleteCmd);
        } catch (IOException e) {

        }
    }

}

Answer 3

我认为您忘记在 AndroidManifest.xml 文件中设置写入权限，这就是 delete() 始终返回 false 的原因。

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

Answer 4

Try the following code to delete the automatically created files and when you don't know where it is stored:

public void clearApplicationData() {
    File cache = getCacheDir();
    File appDir = new File(cache.getParent());
    if (appDir.exists()) {
        String[] children = appDir.list();
        for (String s : children) {
            if (!s.equals("lib")) {
                deleteDir(new File(appDir, s));
                Log.i("TAG",
                        "**************** File /data/data/APP_PACKAGE/" + s
                                + " DELETED *******************");
            }
        }
    }
}

public static boolean deleteDir(File dir) {
    if (dir != null && dir.isDirectory()) {
        String[] children = dir.list();
        for (int i = 0; i < children.length; i++) {
            boolean success = deleteDir(new File(dir, children[i]));
            if (!success) {
                return false;
            }
        }
    }

    return dir.delete();
}

Answer 5

Its very simple:

File file = new File(YOUR_IMAGE_PATH).delete();
if(file.exists())
    file.delete();

Hope it will help you.

Answer 6

File file = new File(selectedFilePath);
boolean deleted = file.delete();

path would be something like : /mnt/Pictures/SampleImage.png

Answer 7

public void deleteOnExit ()

Schedules this file to be automatically deleted when the VM terminates normally.

Note that on Android, the application lifecycle does not include VM termination, so calling this method will not ensure that files are deleted. Instead, you should use the most appropriate out of:

Use a finally clause to manually invoke delete(). Maintain your own set of files to delete, and process it at an appropriate point in your application's lifecycle. Use the Unix trick of deleting the file as soon as all readers and writers have opened it. No new readers/writers will be able to access the file, but all existing ones will still have access until the last one closes the file.

Answer 8

Try this it will delete file from external storage.

public void deleteFromExternalStorage(String fileName) {
    String fullPath = "/mnt/sdcard/";
    try
    {
        File file = new File(fullPath, fileName);
        if(file.exists())
            file.delete();
    }
    catch (Exception e)
    {
        Log.e("App", "Exception while deleting file " + e.getMessage());
    }
}