Android Activity only works if it's declared as main and launcher activity

Question

I'm building a music player in android. What I'm trying is to show playlist when the app launches and user click on the list item and intent is passed to the android_player activity which plays the song. But it's not working and when i click on list item app crashes and closes.

But when I declare music_player activity as launcher it works. But I want to show the playlist first and not the music_player.

I have following manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.app"
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=".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>
    <activity
        android:name=".AndroidMusicPlayerActivity"
        android:label="@string/app_name"
        android:configChanges="keyboardHidden|orientation"
        android:screenOrientation="portrait">
        <-- <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

What changes I should make to my manifest file to make it work.

AndroidMusicPlayerActivity has following code to receive intent

@Override
protected void onActivityResult(int requestCode,
                                 int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(resultCode == 100){
         currentSongIndex = data.getExtras().getInt("songIndex");

         // play selected song
         playSong(currentSongIndex);
    }

}

MainActivity which shows playlist passes following intent

 lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // getting listItem index
                int songIndex = position;

                // Starting new intent
                Intent in = new Intent(getApplicationContext(),
                        AndroidMusicPlayerActivity.class);
                // Sending songIndex to PlayerActivity
                in.putExtra("songIndex", songIndex);
                setResult(100, in);
                // Closing PlayListView
                finish();
            }
        });

Log Cat data, when I click on listitem.

04-30 16:17:16.946: D/OpenGLRenderer(3858): Enabling debug mode 0 04-30
16:17:29.958: W/IInputConnectionWrapper(3858): showStatusIcon on inactive InputConnection 
04-30 16:17:30.018: D/OpenGLRenderer(3858): Flushing caches (mode 0)

What changes I should make to make this code work. I'm new to android. Please help. Thanks!!

Answer 1

I may be missing something but in your itemClickListener you seem to be calling finish() on your first activity without starting the second. Surely you need to add a startActivity(in); call.