CODEWITHSUNDEEP
android
HSN
HSN

Reputation: 783

Application crashing when moving from activity to another

First Activity :
It crashes when the button at the first activity gets clicked

package com.example.android_hw_3;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.*;
import android.widget.*;
public class MainActivity extends Activity 
{
    Button btn; 
    TextView tv; 
    Button btn2;


    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn2 = (Button) findViewById(R.id.btn2);
        btn = (Button) findViewById(R.id.btn1);
         tv = (TextView)findViewById(R.id.tv1);

         btn.setOnClickListener(new View.OnClickListener() 

         {

            @Override
            public void onClick(View view) {
                show();

            }
        });

         btn2.setOnClickListener(new View.OnClickListener() 
         {


            @Override
            public void onClick(View v) {
                move();

            }
        });
    }



    public void show()

    {
        tv.setText("This is a test ..Please work :$");


    }
    public void move()
    {

        Intent i = new Intent (this,Second.class);
        i.putExtra("value", "this is from first :D ");
        startActivityForResult(i,1);


    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

Second :

package com.example.android_hw_3;

import android.R.string;
import android.app.Activity;
import android.os.Bundle;
import android.view.*;
import android.widget.*;

public class Second extends Activity {
    TextView tv2;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
         super.onCreate(savedInstanceState);
            setContentView(R.layout.second);
            Bundle extra = getIntent().getExtras();
            String val1 = extra.getString("value");
            TextView tv2 = (TextView)findViewById(R.id.tv2);
            tv2.setText(val1);
    }

Upvotes: 0

Views: 470

Answers (3)

Zubair Ahmed
Zubair Ahmed

Reputation: 2897

You are calling startActivityForResult in your move() method. According to your situation you should use startActivity(intent) like:

Intent intent = new Intent (MainActivity.this,Second.class); intent.putExtra("value", "this is from first :D ");
startActivity(i);

Also check in your Manifest that you should add the following line of code under application tag

<activity android:name="yourpackagename.Second"> </activity>

Hope this will help you

Also you should take a look at difference between startActivity() and startActivityForResult() here and here

Upvotes: 2

Kyoung-june Yi
Kyoung-june Yi

Reputation: 533

Fix your second activity class like this.

public class Second extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        Bundle extra = getIntent().getExtras();
        String val1 = extra.getString("value");
        TextView tv2 = (TextView)findViewById(R.id.tv2);
        tv2.setText(val1);
    }
}

Upvotes: 1

ρяσѕρєя K
ρяσѕρєя K

Reputation: 132972

In Second Activity you are initializing TextView before setting layout for Activity so move it after setContentView as:

TextView tv2; //<< declare TextView here
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
         tv2 = (TextView)findViewById(R.id.tv2);  // initialize here
          // your code here...
     }

Upvotes: 1

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