public static void saveFile(String str) {
String filePath = null;
boolean hasSDCard = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
if (hasSDCard) { // SD卡根目錄的hello.text
filePath = Environment.getExternalStorageDirectory().toString() + File.separator + "hello.txt";
} else // 系統下載緩存根目錄的hello.text
filePath = Environment.getDownloadCacheDirectory().toString() + File.separator + "hello.txt";
try {
File file = new File(filePath);
if (!file.exists()) {
File dir = new File(file.getParent());
dir.mkdirs();
file.createNewFile();
}
FileOutputStream outStream = new FileOutputStream(file);
outStream.write(str.getBytes());
outStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
刪除文件夾下的文件,(對圖片,要是隻刪除文件夾的話,有的手機在圖庫還會顯示那個文件夾下的圖片只是一張灰色的佔位圖,不能正常顯示,所以要刪除文件夾下的文件)
String path = Environment.getExternalStorageDirectory() + File.separator + "wtimage";
File file = new File(path);
if (file.isDirectory()) {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
File f = files[i];
FileUtil.deleteFile(f);
}
file.delete();//如要保留文件夾,只刪除文件,請註釋這行
} else if (file.exists()) {
file.delete();
}