How to debug a Service?

Sat, 12/12/2009 - 09:47 | by akos

SDK Version:

Introduction

When you start a project with a service in it in debug mode, and you placed a breakpoint in a method of the service, the debugger will not stop.

Solution

The solution that works in almost all situation is to wait declaratively in the code for the debugger to attach. To do this, you have to make a call to:

android.os.Debug.waitForDebugger();

The breakpoint can be inserted at any line after this call.

As a complete example, the SoftKeyboard tutorial is enhanced with the call above:

public class SoftKeyboard extends InputMethodService 
        implements KeyboardView.OnKeyboardActionListener {
        
    @Override
        public void onConfigurationChanged(Configuration newConfig) {
        Log.d("SoftKeyboard", "onConfigurationChanged()");
 
        /* now let's wait until the debugger attaches */
        android.os.Debug.waitForDebugger();
        
        super.onConfigurationChanged(newConfig);
        
        /* do something useful... */
                
        }

As you can see in the code, the first call in the method is a call to the logger, with which we can see in the Log output when our method was called. This can be an other way of tracking our method calls, without the need to stop at a breakpoint. But usually this is not enough for detailed debugging.
Then the second statement waits for the debugger to attach, as it is also noted in the comment. After this line the breakpoint can be inserted anywhere in the method.

Debugging a Service in case an Activity is also part of the application is even easier. In that case the activity has to be started first, then the debugger is able to stop at the breakpoint in the service as well, without the need of an explicit waitForDebugger() call.

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public class SoftKeyboard extends InputMethodService
implements KeyboardView.OnKeyboardActionListener {

@Override
public void onConfigurationChanged(Configuration newConfig) {
Log.d("SoftKeyboard", "onConfigurationChanged()");

/* now let's wait until the debugger attaches */
android.os.Debug.waitForDebugger();

super.onConfigurationChanged(newConfig);

/* do something useful... */

}

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