我有一种方法可以从 url 下载图像并将其保存在内部存储的文件夹中
public void saveDynamicImage(String url,String fileName, String folderName) {
InputStream iStream;
BufferedInputStream buffInputStream;
ByteArrayBuffer byteArray = null;
try {
HttpGet httpGet = new HttpGet(url);
HttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(httpGet);
iStream = httpResponse.getEntity().getContent();
buffInputStream = new BufferedInputStream(iStream, 8 * 1024);
byteArray = new ByteArrayBuffer(50);
int current = 0;
while ((current = buffInputStream.read()) != -1) {
byteArray.append((byte) current);
}
} catch (ClientProtocolException e1) {
} catch (IOException e1) {
}
File dynamicImageDir = context.getDir(AppConstants.DYNAMIC_IMAGE, Context.MODE_PRIVATE);
File appNamefileDir = new File(dynamicImageDir, BaseActivity.appDataStore.getAppName());
appNamefileDir.mkdirs();
File controlNameDir = new File(appNamefileDir, folderName);
controlNameDir.mkdirs();
File file = new File(controlNameDir, fileName);
try {
FileOutputStream outputStream = new FileOutputStream(file);
outputStream.write(byteArray.toByteArray());
outputStream.close();
System.out.println("DynamicImage saving over!..");
} catch (FileNotFoundException e) {
} catch (IOException e) {
}
}
我想在某个时间点删除整个目录。我删除整个目录的方法是
public void deleteDynamicImage() throws NullPointerException,FileNotFoundException {
File rootDirectory = context.getDir(AppConstants.DYNAMIC_IMAGE, Context.MODE_WORLD_WRITEABLE);
boolean status = rootDirectory.delete();
Log.e("", "delete : "+status);
}
我的状态为“假”。文件已创建并且工作正常。唯一的问题是删除。有什么我想念的吗?
最佳答案
你的文件是目录吗?
如果是,您需要先删除此文件夹中的文件
这段代码运行良好
public void deleteDirectory(File file) {
if( file.exists() ) {
if (file.isDirectory()) {
File[] files = file.listFiles();
for(int i=0; i<files.length; i++) {
if(files[i].isDirectory()) {
deleteDirectory(files[i]);
}
else {
files[i].delete();
}
}
}
file.delete();
}
}
关于android - file.delete() 从 android 内部存储返回 false,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21750499/