- add logger

.idea/misc.xml

@@ -37,7 +37,7 @@
     <ConfirmationsSetting value="0" id="Add" />
     <ConfirmationsSetting value="0" id="Remove" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/src/main/AndroidManifest.xml

@@ -2,6 +2,9 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.nclab.ncmultipeerchat">
 
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

app/src/main/java/com/nclab/ncmultipeerchat/NetworkLogger.java

+package com.nclab.ncmultipeerchat;
+
+import android.content.Context;
+import android.os.Environment;
+import android.widget.Toast;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Calendar;
+
+/**
+ * log to file
+ */
+public class NetworkLogger {
+
+    private BufferedWriter m_bufferedWriter;
+
+    public NetworkLogger(Context context, String fileName) {
+        String SUFFIX = ".txt";
+        Calendar calendar = Calendar.getInstance();
+        String year = String.valueOf(calendar.get(Calendar.YEAR));
+        String month = String.valueOf(calendar.get(Calendar.MONTH) + 1);
+        String date = String.valueOf(calendar.get(Calendar.DATE));
+        String hour = String.valueOf(calendar.get(Calendar.HOUR_OF_DAY));
+        String minute = String.valueOf(calendar.get(Calendar.MINUTE));
+        String second = String.valueOf(calendar.get(Calendar.SECOND));
+        String time = year+"-"+month+"-"+date+"-"+hour+"-"+minute+"-"+second;
+        String targetPath;
+        if (fileName.isEmpty()) {
+            targetPath = Environment.getExternalStorageDirectory().getPath() + File.separator + time + SUFFIX;
+        } else {
+            targetPath = Environment.getExternalStorageDirectory().getPath() + File.separator + fileName + "-" + time + SUFFIX;
+        }
+        File targetFile = new File(targetPath);
+        if (targetFile != null) {
+            if (!targetFile.exists()) {
+                try {
+                    if (!targetFile.createNewFile())
+                    {
+                        Toast.makeText(context, "Can not create log file!", Toast.LENGTH_SHORT).show();
+                    }
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            } else {
+                if (!targetFile.delete()) {
+                    Toast.makeText(context, "Can not delete old log file!", Toast.LENGTH_SHORT).show();
+                } else {
+                    try {
+                        if (!targetFile.createNewFile())
+                        {
+                            Toast.makeText(context, "Can not create log file!", Toast.LENGTH_SHORT).show();
+                        }
+                    } catch (IOException e) {
+                        e.printStackTrace();
+                    }
+                }
+            }
+
+            try {
+                m_bufferedWriter = new BufferedWriter(new FileWriter(targetPath, true));
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+
+        }
+    }
+
+    public void writeHeaders(String str) {
+        try {
+            m_bufferedWriter.write(str);
+            m_bufferedWriter.flush();
+        } catch (IOException e) {
+            e.printStackTrace();
+            try {
+                m_bufferedWriter.flush();
+                m_bufferedWriter.close();
+            } catch (IOException e2) {
+                e2.printStackTrace();
+            }
+        }
+    }
+
+    public void write(String str, boolean isFlush) {
+        try {
+            m_bufferedWriter.write(System.getProperty("line.separator"));
+            m_bufferedWriter.write(str);
+            if (isFlush) {
+                m_bufferedWriter.flush();
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+            try {
+                m_bufferedWriter.flush();
+                m_bufferedWriter.close();
+            } catch (IOException e2) {
+                e2.printStackTrace();
+            }
+        }
+    }
+
+    public void flush() {
+        try {
+            m_bufferedWriter.flush();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void close(){
+        try {
+            m_bufferedWriter.flush();
+            m_bufferedWriter.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}