CODEWITHSUNDEEP
androidlogging
dsdsdsdsd
dsdsdsdsd

Reputation: 2962

Output an object to the Logcat console

I would like to take a look at an object, similar to a print_r(an_object) in php, or a console.log(an_object) in javascript (in browser), but for Android.

I tried this

public void a_method( SomeClass the_arg )
{ 
    Log.d( "an_id" , the_arg );
}

This generates an error message:

Error:(23, 10) error: no suitable method found for d(String,View) method Log.d(String,String,Throwable) is not applicable (actual and formal argument lists differ in length) method Log.d(String,String) is not applicable (actual argument View cannot be converted to String by method invocation conversion)

Upvotes: 24

Views: 43890

Answers (6)

Farid Gibran
Farid Gibran

Reputation: 11

You can try using Gson class as shown below :

public void yourMethod(SomeClass theObject) {
    Gson gson = new Gson();
    Log.d( "sample" , gson.toJson(theObject));
}

Here is its Gradle repository implementation 'com.google.code.gson:gson:2.8.6'

Upvotes: 1

Aditya Patil
Aditya Patil

Reputation: 1486

Convert object to JSON. You can use Gson.

val gson = Gson()
val json = gson.toJson(yourObject)
Log.e(TAG, json)

Or

Log.e(TAG, Gson().toJson(yourObject))

Upvotes: 12

Tarun Kumar
Tarun Kumar

Reputation: 538

It's a bit easy to output the data object in the logcat.

The correct way is to override the toString() inside the object. It can be generated by the Android Studio itself by following this simple steps:

1- Open the DataClass

2- Press Alt+Insert OR right click and click on Generate...

3- In Generate window select toString()

4- Select all the variables in the next window and click OK

5- toString() method would override in your data class returning the String template of your data model.

Cheers!

Upvotes: 1

Martin Zeitler
Martin Zeitler

Reputation: 76689

just wrote one generic method, which makes it possible trough reflection:

@Override
public String toString() {
    StringBuilder sb = new StringBuilder();
    for (Field field : this.getClass().getDeclaredFields()) {
        String item;
        if(! field.getType().getSimpleName().equals("ArrayList")) {
            try {
                Object value = field.get(this);
                item = String.format("%s %s %s: %s%n", Modifier.toString(field.getModifiers()), field.getType().getSimpleName(), field.getName(), String.valueOf(value));
                sb.append(item);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        } else {
            item = String.format("%s %s %s: ArrayList<>%n", Modifier.toString(field.getModifiers()), field.getType().getSimpleName(), field.getName());
            sb.append(item);
        }
    }
    return sb.toString();
}

Upvotes: 0

OneCricketeer
OneCricketeer

Reputation: 191738

The second argument must be a String. 

Log.d("an_id", String.valueOf(the_arg));

Your error says you can't log a View class

no suitable method found for d(String,View)

Don't be surprised when you see some nonsense in the console when you print that View object through using String.valueOf

Upvotes: 7

Arijoon
Arijoon

Reputation: 2300

You cannot print an object to the console in Java as you would in javascript.

You have three solutions.

1) Use debugger. Place a breakpoint and debug in android studio. Then you can inspect the full object in scope.

2) Serialize your object (for example to JSON) and print the result to console.

3) Override toString method of your object to give you all the information you want and call Log.d("myTag", yourObj.toString())

I highly recommend first method. I used to avoid Debugger but learning how to use the debugger was the best thing I did. It increases your efficiency and makes debugging super easy

Upvotes: 29

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