CODEWITHSUNDEEP
android
Gunaseelan
Gunaseelan

Reputation: 15525

getIntent().getStringExtra() returns null

I have onClick method in MainActivity as following,

public void onClick(View view) {
    Intent i = new Intent(this, SecondActivity.class);
    i.putExtra("I", "0");
    startActivity(i);
}

In SecondActivity I validated the Intent as following

if (getIntent().getStringExtra("I") == null) {
    Toast.makeText(this, "NULL", Toast.LENGTH_LONG).show();
} else {
    Toast.makeText(this, "NOT NULL", Toast.LENGTH_LONG).show();
}

and started the ThirdActivity from SecondActivity as following

public void onClick(View view) {
    Intent i = new Intent(this, ThirdActivity.class);
    startActivity(i);
}

Now when come back to SecondActivity from ThirdActivity getIntent().getStringExtra("I") returns null. I also tried overriding onOptionsItemSelected as following. 

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            Intent i = getIntent();
            i.putExtra("I", "0");
            break;
    }
    return super.onOptionsItemSelected(item);
}

Now don't know how to fix this issue. I don't want to use SharedPreference for this issue.

Upvotes: 0

Views: 2588

Answers (7)

Nikhil Jadhav
Nikhil Jadhav

Reputation: 1621

You are not finishing any activity, and you are passing value from main activity to second, then calling third activity, just returning from the third activity and resuming the second activity, you are not passing any data to second activity while coming from third activity.

just change your code as follow:-

//from second to third
public void onClick(View view) {
Intent i = new Intent(this, ThirdActivity.class);
startActivity(i);
finish();
}

// returning from third to second
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
    case android.R.id.home:
        Intent i = new Intent(this, second.class);
i.putextra("I","0");
startActivity(i);
finish();
        break;
}
return super.onOptionsItemSelected(item);
}

also you can change like this:-

  @Override
public void onBackPressed() {
Intent i = new Intent(this, SecondActivity.class);
i.putExtra("I","0");
startActivity(i);
finish();   

}

 @Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
    case android.R.id.home:
        onBackPressed();
        break;
}
return super.onOptionsItemSelected(item);
}

in your third activity only

if you dont want to startactivty then startActivtyForResult() from second to third:-

startActivityForResult(i,101);

implement onActivtyResult method in second activity:-

 @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     // Check which request we're responding to
if (requestCode == 101 && resultCode == RESULT_OK) {
// Now use data.getStringExtra("I");
}
}

for third activity just finish it in onBackpress() like:-

   @Override
public void onBackPressed() {
 Intent resultData = new Intent();
 resultData.putExtra("I", "0");
 setResult(Activity.RESULT_OK, resultData);
 finish();
 }

 @Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
    case android.R.id.home:
        onBackPressed();
        break;
}
return super.onOptionsItemSelected(item);
}

Upvotes: 1

PEHLAJ
PEHLAJ

Reputation: 10126

Please follow these steps:

  1. start ThirdActivity for result

    public void onClick(View view) {
  Intent i = new Intent(this, ThirdActivity.class);
  startActivityForResult(i, 1);
}

  2. Update following method, add setResult(Activity.RESULT_OK, i);

    @Override
public boolean onOptionsItemSelected(MenuItem item) {
 switch (item.getItemId()) {
  case android.R.id.home:
    Intent i = getIntent();
    i.putExtra("I", "0");
    setResult(Activity.RESULT_OK, i);
    break;
 }
 return super.onOptionsItemSelected(item);
}

  3. In SecondActivity, implement onActivityResult

     @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // Check which request we're responding to
    if (requestCode == 1 && resultCode == RESULT_OK) {
    // Now use data.getStringExtra("I");
    }
}

Upvotes: 2

MadScientist
MadScientist

Reputation: 2164

You can try using startActivityForResult() method for your linking from SecondActivity to ThirdActivity this way, you can then use setResult(intent) before killing the ThirdActivty. Thus when you come back to your SecondActivity you will have the result intent you passed in your ThirdActivty inside the onActivityResult method of your SecondActivity.

Hope this helps.

Upvotes: 1

Aanal Shah
Aanal Shah

Reputation: 283

try this : put this on your thirdactivity

  @Override
public void onBackPressed() {
    Intent i = new Intent(this, SecondActivity.class);
    i.putExtra("I","0");
    startActivity(i);
    finish();   

}

Upvotes: 0

umesh vashisth
umesh vashisth

Reputation: 359

you have to pass again 

i.putExtra("I", "0");

from third activity to second activity

Upvotes: 0

R.R.M
R.R.M

Reputation: 790

Make a change when you move towards SecondActivity from ThirdActivity.: 

Intent i = new Intent(this, SeconActivity.class);
i.putExtra("I",getIntent().getStringExtra("I"));
startActivity(i);

Upvotes: 0

user8583580
user8583580

Reputation:

This is because when you come back from third activity to second activity, getIntent() returns the Intent of third activity and not the first.

And while navigating from third activity to second, you are not passing any string extra and hence you get a null value.

Upvotes: 1

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