我想读取SD卡中的csv文件，但是当我选择文件时，有一个文件不能被找到的异常。
代码如下：
Intent intent = new Intent();
intent.setType("file/csv");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select csv"),
SELECT_CSV_Dialog);
if (resultCode == RESULT_OK) {
if (requestCode == 1) {
data = result.getData();//data is the URI
System.out.println("res "+data);
if (data.getLastPathSegment().endsWith("csv") || data.getLastPathSegment().endsWith("CSV")) {
try {
File f = new File(data.getPath());//this is where i get the file not found
FileInputStream fis =new FileInputStream(f);
fis = this.openFileInput(data.toString());
BufferedReader reader = new BufferedReader(
new InputStreamReader(fis));
String line;
while ((line = reader.readLine()) != null) {
String[] RowData = line.split(",");
System.out.println("row "+RowData.length);
if(RowData.length==2){
Toast.makeText(Importt.this, "Schema Supported", Toast.LENGTH_SHORT).show();
break;
}else{
Toast.makeText(Importt.this, "Schema not Supported", Toast.LENGTH_SHORT).show();
}
}}
我从这里获取的错误："File f = new File(data.getPath());"
为什么会出现这个异常呢？
使用下面的代码从csv 文件中读取数据。
try
{
List<String> list = new ArrayList<String>();
String line;
String fileName = "/mnt/sdcard/test.csv";
FileReader reader = new FileReader(fileName);
BufferedReader bufrdr = new BufferedReader(reader);
line = bufrdr.readLine();
while (line != null) {
list.add(line);
line = bufrdr.readLine();
}
bufrdr.close();
reader.close();
String[] array = new String[list.size()];
list.toArray(array);
for (int i = 0; i < list.size(); i++) {
System.out.println(" 22222222 0 0 " + list.get(i).toString() );
}
}
catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
对于 SD-CARD 使用下面的代码检查：
static public boolean hasStorage(boolean requireWriteAccess) {
//TODO: After fix the bug, add "if (VERBOSE)" before logging errors.
String state = Environment.getExternalStorageState();
Log.v(TAG, "storage state is " + state);
if (Environment.MEDIA_MOUNTED.equals(state)) {
if (requireWriteAccess) {
boolean writable = checkFsWritable();
Log.v(TAG, "storage writable is " + writable);
return writable;
} else {
return true;
}
} else if (!requireWriteAccess && Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
return true;
}
return false;
}
逻辑没有问题，我也这么写过。可能是你做判断的时候data.getLastPathSegment()函数处理有问题，我没这么写
FileNotFoundException: /mimetype/mnt/sdcard/file.csv 明显不对，文件系统一般都没有/mimetype这个目录，根目录应该是/mnt，所以是你的data数据没处理好的问题！
看看Manifest.xml中是否设置了
body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;}
<div id="div_map" style="width:100%;height:100%;"></div> 有异常的话你写的时候要抛出异常阿
检查路径是否正确， 是否可以读取