CODEWITHSUNDEEP
androidandroid-layoutnullpointerexceptiontextview
RGS
RGS

Reputation: 4253

Attempt to invoke virtual method 'java.lang.CharSequence android.widget.TextView.getText()' on a null object reference

I'm getting this null exception:

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.widget.TextView.getText()' on a null object reference

and I don't know why.

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setTheme(R.style.LoginRegister);
        setContentView(R.layout.activity_report);

final TextView infoid = (TextView) findViewById(R.id.idInfo);

        RadioGroup rg = (RadioGroup)findViewById(R.id.rg);
        final String radiovalue = ((RadioButton)findViewById(rg.getCheckedRadioButtonId())).getText().toString();

...

        Button sendButton = (Button) findViewById(R.id.button2);
        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String text = infoid.getText().toString(); //what is wrong?
                Log.w("message: ", radiovalue);
            }
        });


}

my xml

   <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/idInfo"
        android:hint="Add some extra information"
        android:layout_weight="0.09"
        android:layout_marginTop="20dp"
        android:layout_marginBottom="20dp" />

    <Button
        android:text="Report"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/button2" />

any ideas?

Upvotes: 2

Views: 21292

Answers (4)

Rakesh Jha
Rakesh Jha

Reputation: 379

If your are using RadioGroup inside Dialog / Alert Dialog then you have to cast it as

     RadioButton radioButton = dialog.findViewById(checkedId);
            Toast.makeText(ReLoan_Activity.this, "Selected Radio Button is 
           : " + radioButton.getText().toString(), 
            Toast.LENGTH_SHORT).show();

Upvotes: 0

Dhruv Miyani
Dhruv Miyani

Reputation: 11

check this

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MyAndroidAppActivity extends Activity {

  private RadioGroup radioGroup;
  private RadioButton radioButton;
  private Button btnDisplay;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    addListenerOnButton();

  }

  public void addListenerOnButton() {

    radioGroup = (RadioGroup) findViewById(R.id.radio);
    btnDisplay = (Button) findViewById(R.id.btnDisplay);

    btnDisplay.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

                // get selected radio button from radioGroup
            int selectedId = radioGroup.getCheckedRadioButtonId();

            // find the radiobutton by returned id
            radioButton = (RadioButton) findViewById(selectedId);

            Toast.makeText(MyAndroidAppActivity.this,
                radioButton.getText(), Toast.LENGTH_SHORT).show();

        }

    });

  }
}

Upvotes: -1

Solar Teleworm
Solar Teleworm

Reputation: 11

if (radioGroup.getCheckedRadioButtonId() <= 0) {
    Toast.makeText(yourclass, "Choose Radio Button Please", Toast.LENGTH_SHORT).show();
}

Upvotes: 0

Ferdous Ahamed
Ferdous Ahamed

Reputation: 21736

  1. Make sure TextView idInfo is exist in your activity_report.xml

  2. Try declaring idInfo as global.

    ..............
....................

TextView infoid;

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);   
    setContentView(R.layout.activity_report);

    infoid = (TextView) findViewById(R.id.idInfo);

    .............
    ...................

    Button sendButton = (Button) findViewById(R.id.button2);
    sendButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String text = infoid.getText().toString();
            ..........
            .................
        }
    });

}

UPDATE:

To get selected radioButton text:

RadioGroup radioGroup = (RadioGroup)findViewById(R.id.rg);

// get selected radioButton from radioGroup
int selectedId = radioGroup.getCheckedRadioButtonId();

// find the radioButton by returned id
radioButton = (RadioButton) findViewById(selectedId);

// radioButton text
String radiovalue = radioButton.getText();

Hope this will help~

Upvotes: 3

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