Question

我想从网址下载图片并保存到内部存储空间我有这个代码，但如果我的手机没有外置存储，则无法下载图像

    Bitmap b=null;
    URL url;
    InputStream iStream=null;
    File tmpFile;
    try {
        url = new URL(strURL);
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();            
        urlConnection.connect();
        iStream = urlConnection.getInputStream();
        File cacheDirectory = context.getCacheDir();
        tmpFile = new File(cacheDirectory.getPath() + "/news.png");
        FileOutputStream fOutStream = new FileOutputStream(tmpFile);
        b = BitmapFactory.decodeStream(iStream);
        b.compress(Bitmap.CompressFormat.PNG,100, fOutStream);

        fOutStream.flush();
        fOutStream.close();
    }
    catch(Exception ee)
    {

    }
    return b;

您是否帮我将图片从网址下载到外部存储的内部存储空间

Answer 1

首先需要检查手机是否有外部目录。 android documentation已经有代码可以执行此操作。

/* Checks if external storage is available for read and write */
public boolean isExternalStorageWritable() {
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state)) {
        return true;
    }
    return false;
}

/* Checks if external storage is available to at least read */
public boolean isExternalStorageReadable() {
    String state = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(state) ||
        Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        return true;
    }
    return false;
}

将图像下载到内部存储

1 个答案: