setContentView causes crash

Question

I'm trying the very first tutorial on the android website here

The goal is to enter a text and ship it to a next page to display it.

However, I always get "Unfortunately My First App has stopped".

I noticed that when I comment out setContentView(textView); it works.

Here is my code: (LogCat stopped showing problems for some reason so I can't give the log)

package com.example.myfirstapp; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v7.app.ActionBarActivity; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class DisplayMessageActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { // Get the message from the intent Intent intent = getIntent(); String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE); // Create the text view TextView textView = new TextView(this); textView.setTextSize(40); textView.setText(message); // Set the text view as the activity layout // setContentView(textView); super.onCreate(savedInstanceState); setContentView(R.layout.activity_display_message); if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()).commit(); } }

move this two line to first line of onCreate() method and post logcat error. super.onCreate(savedInstanceState); setContentView(R.layout.activity_display_message); — Shayan Pourvatan
– Shayan Pourvatan, Commented Apr 4, 2014 at 14:11

mimetist · Accepted Answer · 2014-04-04 14:12:03Z

This lines should be right after your onCreate(Bundle savedInstanceState)

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

Try that.

Jagdish · Accepted Answer · 2014-04-04 14:22:15Z

Please try the below code and post the logcat.

 package com.example.myfirstapp; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v7.app.ActionBarActivity; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class DisplayMessageActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_display_message); // Get the message from the intent Intent intent = getIntent(); String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE); // Create the text view TextView textView = (TextView) findViewById(R.id.textView); textView.setTextSize(40); textView.setText(message); if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()).commit(); } } }

I think need to declare TextView also in xml. I hope this will help. Thanks!

i think you need setContentView(textView); after set text to TextView, because you create new TextView and don't use that on layout,

laalto · Accepted Answer · 2014-04-04 14:11:36Z

You cannot call setContentView() before super.onCreate().

Generally, super.onCreate() should be the first line in your overridden onCreate().

Note that you already have setContentView() later that overrides your commented-out setContentView() content view.

Dan Is Fiddling By Firelight · Accepted Answer · 2014-06-30 22:03:15Z

The solution to the problem is while creating new android activity for DisplayMessageActivity, make sure its Hierarchical parent is selected as the MainActivity.

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