网友通过本文主要向大家介绍了android sd卡路径,android sd卡权限,android sd卡,android sd卡目录,android获取sd卡路径等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
Android--向SD卡读写数据
// 向SD卡写入数据
private void writeSDcard(String str) {
try {
// 判断是否存在SD卡
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// 获取SD卡的目录
File sdDire = Environment.getExternalStorageDirectory();
FileOutputStream outFileStream = new FileOutputStream(
sdDire.getCanonicalPath() + "/test.txt");
outFileStream.write(str.getBytes());
outFileStream.close();
Toast.makeText(this, "数据保存到text.txt文件了", Toast.LENGTH_LONG)
.show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
// 从SD卡中读取数据
private void readSDcard() {
StringBuffer strsBuffer = new StringBuffer();
try {
// 判断是否存在SD
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
File file = new File(Environment.getExternalStorageDirectory()
.getCanonicalPath() + "/test.txt");
// 判断是否存在该文件
if (file.exists()) {
// 打开文件输入流
FileInputStream fileR = new FileInputStream(file);
BufferedReader reads = new BufferedReader(
new InputStreamReader(fileR));
String st = null;
while ((st = reads.readLine()) != null) {
strsBuffer.append(st);
}
fileR.close();
} else {
Toast.makeText(this, "该目录下文件不存在", Toast.LENGTH_LONG).show();
}
}
} catch (Exception e) {
e.printStackTrace();
}
Toast.makeText(this, "读取到的数据是：" + strsBuffer.toString() + "",
Toast.LENGTH_LONG).show();
}
}