How to log results to the console in android studio

Question

i have just made a small test case in my android studio project , see code below :

public class MainActivityTest extends ActivityInstrumentationTestCase2<MainActivity> {

    MainActivity activity;



    public MainActivityTest() {
        super(MainActivity.class);
    }

    @Override
    protected void setUp() throws Exception {
        super.setUp();
        activity = getActivity();
    }

    public void testMainActivity() {
        TextView textView = (TextView) activity.findViewById(R.id.hello_world);
        Log.d(textView);
        assertNotNull(textView);
    }
}

now all i wanted to do was log the value of textView to the console , so i referred the documentation and saw that i could console.log() results(just like in javascript) using Log.d(testView); .

but the problem is the below line in my code :

Log.d(testView); , causes an error , when i hover over Log i get the message saying "cannot resolve symbol Log" .

so my question is how do i log results to the console in android studio .

I refered to THIS question too but i'am still stuck.

score 6 · Accepted Answer · answered Jul 12 '15 at 22:36

6

It saying this because there is no Log.d(TextView textView) method. Here is a doc https://developer.android.com/reference/android/util/Log.html. But there is a Log.d(String tag, String message) method. Then call it like

Log.d("Message tag",textView.getText().toString());

answered Jul 12 '15 at 22:36

Sebastian Pakieła

2,970
1
16
24

worked , but how do i see it in the console now , do i have to run something ? – Tenali_raman Jul 12 '15 at 22:57
Select `Android` in bottom menu in Android Studio and click `logcat` then. Select proper filter and it should be visible. – Sebastian Pakieła Jul 12 '15 at 23:25
did that , see the screen shot here , i still can't see anything in the log http://i.imgur.com/xoUa4q6.jpg – Tenali_raman Jul 12 '15 at 23:46
You can see these red text saying no application and no device selected. When you connect something and run app, logcat should fulfill. – Sebastian Pakieła Jul 12 '15 at 23:50
so logcat needs a external device to run ? – Tenali_raman Jul 13 '15 at 01:22

score 3 · Answer 2 · answered Jul 12 '15 at 22:35

Log.d("TAG", "Message");

1) Use capital letter as Log not log 2) It has two params (or three), not just one

You can log textview value by

TextView textView = (TextView) activity.findViewById(R.id.hello_world);
Log.d("TAG", textView.getText().toString());

score 2 · Answer 3 · answered Jul 12 '15 at 22:37

Log is a part of android.util.Log. So you must first import this.

Log uses a tag as it's first parameter, and an output string as it's second. For example:

private static final String TAG = "MyActivity";
Log.d(TAG, "index=" + i);

You could also do System.out.println("My string here");

But please note that there is an error in your code. Log requires a string value, which can be fetched using testView.getText().toString() instead of testView

score 1 · Answer 4 · answered Jul 12 '15 at 22:39

1

Did you import it?

import android.util.Log

And according to the documentation you have to put at least 2 strings to the function, a TAG and a message:

log.d("MainActivityTest", textView.getText());

answered Jul 12 '15 at 22:39

Alex Cortinovis

166
9

worked , but how do i see it in the console now , do i have to run something ? – Tenali_raman Jul 12 '15 at 23:21

How to log results to the console in android studio

4 Answers4