Question

I would to know whether logging can decrease application performance?
Also, please give me some tips to increase android application performance.

Answer 1

Yes. Excessive logging affects the performance of any application not just Android.

The developer guide suggests you to deactivate and disabled logging before release:

Turn off logging and debugging Make sure you deactivate logging and
disable the debugging option before you build your application for
release. You can deactivate logging by removing calls to Log methods
in your source files. You can disable debugging by removing the
android:debuggable attribute from the tag in your
manifest file, or by setting the android:debuggable attribute to false
in your manifest file. Also, remove any log files or static test files
that were created in your project.

Also, you should remove all Debug tracing calls that you added to your
code, such as startMethodTracing() and stopMethodTracing() method
calls.

So, you should suppress the logs in “release” or “production” build of your App.

Turn off it in Android Manifest by setting debuggable:

<application android:icon="@drawable/icon" 
        android:label="@string/app_name"
        android:debuggable="false">

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Another way

Create your own logger class and check for debugging mode before executing log. It allows single point modification between debugging mode and deployed application and allows extra things to do such as writing to log file.

import android.util.Log;
public class MyLog {
    private static final boolean isDebug = false;;
    public static void i(String tag, String msg) {
        if (isDebug) {
            Log.i(tag, msg);
        }
    }
    public static void e(String tag, String msg) {
        if (isDebug) {
            Log.e(tag, msg);
        }
    }
}

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For further info read http://rxwen.blogspot.com/2009/11/logging-in-android.html

and The SO QAs :

Log.d and impact on performance

Android Logging – How to clear for better performance