Getting Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

Question

Following is my code : I am sending the jSON object from one activity to another Activity.

// In LoginActivity
Intent intent = new Intent(LoginActivity.this,EmpLoginActivity.class);
                                    startActivity(intent);

intent.putExtra("data",jsonObject.toString());

In EmpLoginActivty.java

  try {
        JSONObject jsonObject = new JSONObject(getIntent().getStringExtra("data"));
            tv1.setText(jsonObject.getString("name"));
            tv2.setText(jsonObject.getString("type"));
            tv3.setText(jsonObject.getString("hours"));

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

Error :

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.krish.emp/com.example.krish.emp.EmpLoginActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

Debug code, looks like jsonObject.toString is returning Null. — Raviprakash, Apr 08 '18 at 14:56
Try calling `startActivity` _after_ you call `intent.putExtra` — EJK, Apr 08 '18 at 15:05

score 0 · Accepted Answer · answered Apr 09 '18 at 01:05

0

You need to fully populate the Intent before you pass it to startActivity.

So change this:

startActivity(intent);
intent.putExtra("data",jsonObject.toString());

to this:

intent.putExtra("data",jsonObject.toString());
startActivity(intent);

answered Apr 09 '18 at 01:05

EJK

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Getting Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

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