Android , unfortunately app has stopped

Question

I am new to the android working environment, was following some tutorial regarding fragments, there appears to be no error when i build and run the project but once the app is installed on the emulator i get this message in the dialog saying the app has stopped working

I have spent an entire day looking for a solution now any help will be appreciated here is the source code below: MainActivity.java:

package com.example.fragmentsanotherexample;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;

public class MainActivity extends FragmentActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    FragmentManager fm=getSupportFragmentManager();
    android.support.v4.app.Fragment fragment=fm.findFragmentById(R.id.fragment_content);

    if(fragment==null){

        FragmentTransaction ft=fm.beginTransaction();
        ft.add(R.id.fragment_content, new BasicFragment());
        ft.commit();

    }
}

@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;
}

 }

BasicFragment.java:

package com.example.fragmentsanotherexample;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;



public class BasicFragment extends Fragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){

    View view=inflater.inflate(R.layout.basic_fragment,container,false);

    Button button=(Button) view.findViewById(R.id.fragment_button);

    button.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
        Activity activity=getActivity();

            if(activity != null){

                Toast.makeText(activity, R.string.hello_world, Toast.LENGTH_LONG).show();
            }

        }
    });
    return view;
}


}

Here is the basic_fragment.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Button android:id="@+id/fragment_button"
    android:text="@string/btn_fragment"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />



</LinearLayout>

Here is activiy_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<FragmentLayout
    android:id="@+id/fragment_content"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />




</LinearLayout>

Here is the manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.fragmentsanotherexample"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.fragmentsanotherexample.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

As far as the logcat is concerned it's empty, any sort of help would be really appreciated

Logcat shouldn't be empty. Try adjusting filters for the correct pid, or try running on phone. — Timmetje, Jul 04 '13 at 08:46
go to ddms and select your device and application you will get the log — farrukh, Jul 04 '13 at 08:47
After inflating your fragment, add it to your main view before assigning button listener. — Aleks G, Jul 04 '13 at 08:49
[2013-07-04 13:42:35 - FragmentsAnotherExample] Success! [2013-07-04 13:42:35 - FragmentsAnotherExample] Starting activity com.example.fragmentsanotherexample.MainActivity on device emulator-5554 [2013-07-04 13:42:36 - FragmentsAnotherExample] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.fragmentsanotherexample/.MainActivity } — Hassan, Jul 04 '13 at 08:51
@user1485075 if using eclipse goto windows open perspective . click ddms. there you can see the logcat. post the details of crash — Raghunandan, Jul 04 '13 at 08:53
If your emulator is detached than try with rest adb option of device perspective . — kaushal trivedi, Jul 04 '13 at 08:55

score 1 · Answer 1 · answered Jul 04 '13 at 08:48

1

   <FragmentLayout
    android:id="@+id/fragment_content"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />

AFAIK FragmentLayout doest not exist. Do you want a FrameLayout?

answered Jul 04 '13 at 08:48

Blackbelt

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The project wouldn't compile if this were the case – Aleks G Jul 04 '13 at 08:50
@AleksG are you sure? – Blackbelt Jul 04 '13 at 08:52
The tutorial i am following say that if u want to add fragment at runtime u ull have to change the fragment to fragmentlayout:http://stackoverflow.com/questions/2378607/what-permission-do-i-need-to-access-internet-from-an-android-application – Hassan Jul 04 '13 at 08:53
I can't see how the project would compile/build if there were errors in XML - that's all. I haven't encountered FragmentLayout myself either. – Aleks G Jul 04 '13 at 08:53
I've observed using Your code 'java.lang.RuntimeException: Unable to start activity ... Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.FragmentLayout" '. I believe You should observe the same. – sandrstar Jul 04 '13 at 08:55
I think the errors are due of an xml that can not be parsed. If the "translation" from xml to java generates a class that does not exists the problem I think the problem will be at runtime. What do you think? – Blackbelt Jul 04 '13 at 08:56
@blackbelt nice catch. staring at the code for a long time. could not spot the mistake – Raghunandan Jul 04 '13 at 08:56
can it be a problem with the min version of API being used?? – Hassan Jul 05 '13 at 07:16
As far as you use the support package you are good. – Blackbelt Jul 05 '13 at 07:17
iv tried but still have'nt pointed out the error, can it be an issue with the APIs i am using and for this example my minSDK version in the maifest is 8, is it a problem???? – Hassan Jul 05 '13 at 09:52
you should tell me what error do you get at least – Blackbelt Jul 05 '13 at 09:52

Android , unfortunately app has stopped

1 Answers1