启动时找不到目录

发布于 2025-01-04 00:52:32 字数 686 浏览 0 评论 0原文

在我的应用程序中，我创建了一项旨在从 SD 卡读取内容的服务。

该服务在引导时创建并启动。

问题是，虽然我很确定该目录存在，但在启动时，该服务找不到该目录。

public void onStart(Intent intent, int startId) {
    super.onStart(intent, startId);
    Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
    Context context=getBaseContext();
    File sdDir = new File(Environment.getExternalStorageDirectory()+"/temp/Data/");
    if(!sdDir.exists()){
        sdDir.mkdir();
        Toast.makeText(this, "CAN'T FIND!", Toast.LENGTH_LONG).show();
    }
 }

上面的这段输出

Service Started
CAN'T FIND!

起初，我认为SD卡可能在启动时没有安装，这就是服务找不到该目录的原因。我对此仍然不确定。

有人有主意吗？可能是什么问题？

原文

In my application, I create a service that aims to read something from sd card.

The service is created and started at boot time.

The problem is that although I am pretty sure that the directory exists, at the boot time, the service cannot find the directory.

public void onStart(Intent intent, int startId) {
    super.onStart(intent, startId);
    Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
    Context context=getBaseContext();
    File sdDir = new File(Environment.getExternalStorageDirectory()+"/temp/Data/");
    if(!sdDir.exists()){
        sdDir.mkdir();
        Toast.makeText(this, "CAN'T FIND!", Toast.LENGTH_LONG).show();
    }
 }

This snippet above outputs

Service Started
CAN'T FIND!

At first, I thought that sd card might not be mounted at boot time and that's why the service can't find the directory. I am still not sure about that.

Anybody has an idea? What might be the problem?

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梦途 2025-01-11 00:52:32

有些设备需要一些时间来安装 SD 卡。它可能无法在启动后立即可用。

只需每隔几秒轮询一次，直到它可用。

另请尝试以下操作：

public static boolean hasStorage(boolean requireWriteAccess) {  
    String state = Environment.getExternalStorageState();  

    if (Environment.MEDIA_MOUNTED.equals(state)) {  
        return true;  
    } else if (!requireWriteAccess  && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {  
        return true;  
    }  
    return false;  
}

从这里

Some devices take time to mount the SD card. It may not be available immediately after Boot time.

Just poll every few seconds until it becomes available.

Also try this:

public static boolean hasStorage(boolean requireWriteAccess) {  
    String state = Environment.getExternalStorageState();  

    if (Environment.MEDIA_MOUNTED.equals(state)) {  
        return true;  
    } else if (!requireWriteAccess  && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {  
        return true;  
    }  
    return false;  
}

From Here

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