Creating and Storing Log File on device in Android

Hello Friends,
        Today, I am sharing another android tutorial which helps you in Creating
and Storing Log File in your android phone.


1. MainActivity.java

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1. package com.example.logfileimplementation;  
2.   
3. import java.io.File;  
4.   
5. import android.os.Bundle;  
6. import android.os.Environment;  
7. import android.app.Activity;  
8. import android.util.Log;  
9. import android.view.Menu;  
10. import android.widget.TextView;  
11.   
12. public class MainActivity extends Activity {  
13.    
14.  public static final String SDCARD = String.valueOf(Environment  
15.    .getExternalStorageDirectory());  
16.  TextView mTextView;  
17.  @Override  
18.  protected void onCreate(Bundle savedInstanceState) {  
19.   super.onCreate(savedInstanceState);  
20.   try {  
21.   deleteLog();  
22.   setContentView(R.layout.activity_main);  
23.   createAppDirectories();  
24.   mTextView = (TextView) findViewById(R.id.action_settings);  
25.   mTextView.setText("Android crash Reporter");  
26.   } catch(Exception ex) {  
27.    Utilities.writeIntoLog(Log.getStackTraceString(ex));  
28.   }  
29.  }  
30.   
31.  @Override  
32.  public boolean onCreateOptionsMenu(Menu menu) {  
33.   // Inflate the menu; this adds items to the action bar if it is present.  
34.   getMenuInflater().inflate(R.menu.main, menu);  
35.   return true;  
36.  }  
37.   
38.  // Creating App Directory For Log File  
39.  private void createAppDirectories() {  
40.   System.out.println("hiii");  
41.   File dir1 = new File(Utilities.APP_DIR);  
42.   if (!dir1.exists()) {  
43.    dir1.mkdir();  
44.   }  
45.  }  
46.   
47.  // Deleting App Directory which is used for Log File  
48.  private void deleteLog() {  
49.   
50.   File log = new File(Utilities.LOG_FILE_PATH);  
51.   if (log.exists()) {  
52.    log.delete();  
53.   }  
54.  }  
55. }  

package com.example.logfileimplementation;

import java.io.File;

import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 public static final String SDCARD = String.valueOf(Environment
   .getExternalStorageDirectory());
 TextView mTextView;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  try {
  deleteLog();
  setContentView(R.layout.activity_main);
  createAppDirectories();
  mTextView = (TextView) findViewById(R.id.action_settings);
  mTextView.setText("Android crash Reporter");
  } catch(Exception ex) {
   Utilities.writeIntoLog(Log.getStackTraceString(ex));
  }
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

 // Creating App Directory For Log File
 private void createAppDirectories() {
  System.out.println("hiii");
  File dir1 = new File(Utilities.APP_DIR);
  if (!dir1.exists()) {
   dir1.mkdir();
  }
 }

 // Deleting App Directory which is used for Log File
 private void deleteLog() {

  File log = new File(Utilities.LOG_FILE_PATH);
  if (log.exists()) {
   log.delete();
  }
 }
}

2. Utilities.java

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1. package com.example.logfileimplementation;  
2.   
3. import java.io.BufferedWriter;  
4. import java.io.FileWriter;  
5.   
6.   
7. public class Utilities {  
8.  public static String APP_DIR = MainActivity.SDCARD+"/Logfile";  
9.  public static String LOG_FILE_PATH = APP_DIR+"/ myapp_log.txt";    
10.    
11.    
12.    
13.  public static void writeIntoLog(String data)   
14.  {  
15.      
16.   FileWriter fw = null;      
17.   try {  
18.      
19.    fw = new FileWriter(LOG_FILE_PATH , true);  
20.    BufferedWriter buffer = new BufferedWriter(fw);     
21.    buffer.append(data+"\n");  
22.       
23.    buffer.close();  
24.   
25.   } catch (Exception e) {   
26.    e.printStackTrace();  
27.   }  
28.      
29.  }    
30. }  

package com.example.logfileimplementation;

import java.io.BufferedWriter;
import java.io.FileWriter;


public class Utilities {
 public static String APP_DIR = MainActivity.SDCARD+"/Logfile";
 public static String LOG_FILE_PATH = APP_DIR+"/ myapp_log.txt";  
 
 
 
 public static void writeIntoLog(String data) 
 {
   
  FileWriter fw = null;    
  try {
   
   fw = new FileWriter(LOG_FILE_PATH , true);
   BufferedWriter buffer = new BufferedWriter(fw);   
   buffer.append(data+"\n");
    
   buffer.close();

  } catch (Exception e) { 
   e.printStackTrace();
  }
   
 }  
}

3. activity_main.xml

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1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
2.   
3.     xmlns:tools="http://schemas.android.com/tools"  
4.   
5.     android:layout_width="match_parent"  
6.   
7.     android:layout_height="match_parent"  
8.   
9.     android:paddingBottom="@dimen/activity_vertical_margin"  
10.   
11.     android:paddingLeft="@dimen/activity_horizontal_margin"  
12.   
13.     android:paddingRight="@dimen/activity_horizontal_margin"  
14.   
15.     android:paddingTop="@dimen/activity_vertical_margin"  
16.   
17.     tools:context=".MainActivity" >  
18.   
19.   
20.   
21.     <TextView  
22.   
23.         android:id="@+id/textView"  
24.   
25.         android:layout_width="wrap_content"  
26.   
27.         android:layout_height="wrap_content"  
28.   
29.         android:text="@string/hello_world" />  
30.   
31.     
32.   
33. </RelativeLayout>  

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >



    <TextView

        android:id="@+id/textView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

  

</RelativeLayout>

4. AndroidManifest.xml

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"  
3.     package="com.example.logfileimplementation"  
4.     android:versionCode="1"  
5.     android:versionName="1.0" >  
6.   
7.     <uses-sdk  
8.         android:minSdkVersion="8"  
9.         android:targetSdkVersion="18" />  
10.   
11.     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>  
12.   
13.     <application  
14.         android:allowBackup="true"  
15.         android:icon="@drawable/ic_launcher"  
16.         android:label="@string/app_name"  
17.         android:theme="@style/AppTheme" >  
18.         <activity  
19.             android:name="com.example.logfileimplementation.MainActivity"  
20.             android:label="@string/app_name" >  
21.             <intent-filter>  
22.                 <action android:name="android.intent.action.MAIN" />  
23.   
24.                 <category android:name="android.intent.category.LAUNCHER" />  
25.             </intent-filter>  
26.         </activity>  
27.     </application>  
28.   
29. </manifest>  

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.logfileimplementation"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.logfileimplementation.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Hope this will help you.
Enjoy Coding. Cheers.... :)