Android手机自带内部存储路径的获取 原文地址：http://my.oschina.net/liucundong/blog/288183
直接贴代码：
public static String getExternalSdCardPath() {
if (SDCardUtils.isSDCardEnable()) {
File sdCardFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath());
return sdCardFile.getAbsolutePath();
}
String path = null;
File sdCardFile = null;
ArrayList<String> devMountList = getDevMountList();
for (String devMount : devMountList) {
File file = new File(devMount);
if (file.isDirectory() && file.canWrite()) {
path = file.getAbsolutePath();
String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmmss").format(new Date());
File testWritable = new File(path, "test_" + timeStamp);
if (testWritable.mkdirs()) {
testWritable.delete();
} else {
path = null;
}
}
}
if (path != null) {
sdCardFile = new File(path);
return sdCardFile.getAbsolutePath();
}
return null;
}//读文件
public static String readFile(String fileName) { try {
File file = new File(fileName); FileInputStream fis = new FileInputStream(file); int length = fis.available(); byte [] buffer = new byte[length];
fis.read(buffer); String res = EncodingUtils.getString(buffer, "UTF-8"); fis.close();
return res;
}
catch (Exception ex)
{
ex.printStackTrace();
return null;
} } private static ArrayList<String> getDevMountList() {
String[] toSearch = readFile("/etc/vold.fstab").split(" ");
ArrayList<String> out = new ArrayList<String>();
for (int i = 0; i < toSearch.length; i++) {
if (toSearch[i].contains("dev_mount")) {
if (new File(toSearch[i + 2]).exists()) {
out.add(toSearch[i + 2]);
}
}
}
return out;
}
取得了外部sd卡的路径，就可以把日志文件写到外部sd卡了。日志类非常简单，就一个方法，自己debug的时候用，把结果输出出来。
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.os.Environment; /**
* 日志打印类，提供了一个开关来决定是否打印日志
*/
public class Logger
{
private final static SimpleDateFormat DATEFORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private static final SimpleDateFormat PATHFORMATE =new SimpleDateFormat("yyyyMMdd");
private static final SimpleDateFormat PATHFORMATE1 = new SimpleDateFormat("HH");
private static boolean IsRecord=true;//是否记录日志 //存储卡目录和手机内部目录
private static final String ExternalStorePath = FileUtil.getExternalSdCardPath()+"nanbeiyoulog"
+File.separator+PATHFORMATE.format(new Date())+File.separator;
private static final String FileName = PATHFORMATE1.format(new Date())+".txt"; public static void d(String tag,String msg)
{
if(IsRecord)
{
try {
SaveToSD(tag,msg);
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
} private static void SaveToSD(String tag,String msg)
{
try{
File path = new File(ExternalStorePath);
if(!path.exists())
{
path.mkdirs();
}
File mLogFile = new File(ExternalStorePath+FileName);
if(!mLogFile.exists())
{
mLogFile.createNewFile();
} StringBuffer sb = new StringBuffer();
sb.append(DATEFORMAT.format(new Date()));
sb.append(": ");
sb.append("DEBUG");
sb.append(": ");
sb.append(tag);
sb.append(": ");
sb.append(msg);
sb.append("\n");
RandomAccessFile raf = null;
try
{
raf = new RandomAccessFile(mLogFile, "rw");
raf.seek(mLogFile.length());
raf.write(sb.toString().getBytes("UTF-8"));
}
catch (UnsupportedEncodingException e)
{
e.printStackTrace(); }
catch (IOException e)
{
e.printStackTrace(); }
finally
{
if(raf != null)
{
try
{
raf.close();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
} }
}
catch (IOException ioe)
{
ioe.printStackTrace();
}
} }