Cannot start new activity using Intent in Android

Question

I have two activity MainActivity.java and ListActivity.java.

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button = (Button)findViewById(R.id.nextButton);
    button.setOnClickListener(new AdapterView.OnClickListener(){
        public void onClick(View view){
            startAc(view);
        }
    });
}
public void startAc(View view){
    Intent intent = new Intent(this, ListActivity.class);
    startActivity(intent);
}

As soon as I click the button, the Emulator gives an error Application has stopped working.

Is the use of Intent inappropriate?

Use LogCat to examine the Java stack trace associated with your crash: https://stackoverflow.com/questions/23353173/unfortunately-myapp-has-stopped-how-can-i-solve-this If I had to guess, your problem is that Android already has a class named `ListActivity`, and you are getting your two `ListActivity` classes confused. — CommonsWare, Oct 21 '15 at 17:29
@ItzikSamara `E/AndroidRuntime: FATAL EXCEPTION: main E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sujin.fraglistrevision/com.example.sujin.fraglistrevision.ListActivity2}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298) E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)` — Sujin Shrestha, Oct 22 '15 at 07:04
mate your error is not here but on the other Activity when you start your Adapter please edit your post with the ListActiviytiy Code — Itzik Samara, Oct 22 '15 at 16:10

score 1 · Answer 1 · answered Oct 23 '15 at 10:32

Try this code your wrong import your are import adapterview please import correct View.OnClickListener

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button)findViewById(R.id.nextButton);
button.setOnClickListener(new OnClickListener(){
    public void onClick(View view){

    Intent intent = new Intent(getapplicationcontext(), ListActivity.class);
    startActivity(intent);
                }
    });
   }

Add Your Manifest this line after closing first activity

   <activity android:name=".ListActivity.class"/>

score 0 · Answer 2 · answered Oct 21 '15 at 17:31

0

try changing this to MainActivity.this. Also make sure every activity is defined in manifest

answered Oct 21 '15 at 17:31

haseeb

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Cannot start new activity using Intent in Android

2 Answers2