Android Intent and Intent filter

Question

I have a problem here with my code. I want to pass from an activity to another from a button. Here is my code:

MainActivity.class

ImageView imgsettings;

inside onCreate()

imgsettings = (ImageView) findViewById(R.id.imgviewsettings);
imgsettings.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        startActivity(new Intent("android.intent.action.SETTINGS"));                                
    }
});

AndroidManifest

<activity
    android:name=".AppSettings"
    android:label="@string/title_activity_app_settings" >
    <intent-filter>
        <action android:name="android.intent.action.SETTINGS" />
        <category android:name="android.intent.category.DEFAULT" />
    </intent-filter> 
</activity>

I really cannot find the problem. Everything seem right to me.

what is your question?The question it self not clear what you want. — RaMeSh, Jun 19 '15 at 13:26
Whenever I run the app it gives me an error: FATAL EXCEPTION: main java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.oldie.AppSettings}:java.lang.NullPointexception — Εμμανουήλ Βαρέσης, Jun 19 '15 at 13:48

score 0 · Answer 1 · answered Jun 19 '15 at 13:29

0

You don't have to deal with for this. You have to do startActivity(new Intent(MainActivity.this,AppSettings.class)); to go to AppSettings activity.

answered Jun 19 '15 at 13:29

Nilay Dani

896
6
24

I did it. I wrote: public void onClick(View v) { intent = new Intent(MainActivity.this, AppSettings.class); startActivity(intent); } It still gives me an error: FATAL EXCEPTION: main java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.oldie.AppSettings}:java.lang.NullPointexception – Εμμανουήλ Βαρέσης Jun 19 '15 at 13:51

score 0 · Accepted Answer · edited May 23 '17 at 11:51

0

There is no action with the name android.intent.action.SETTINGS. Try to remove the <intent-filter> from your manifest and add this code snippet in the onClick() method:

Intent intent = new Intent(android.provider.Settings.ACTION_SETTINGS);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);

Take a look at this SO question Opening Android Settings programmatically

edited May 23 '17 at 11:51

Community

1
1

answered Jun 19 '15 at 13:29

Gabriella Angelova

2,985
1
17
30

I don't want to open the android OS Settings, I want to open an Activity that has the settings for my app. – Εμμανουήλ Βαρέσης Jun 19 '15 at 13:51
Then just open a new activity `Intent intent = new Intent(this, AppSettings.class); startActivity(intent); ` but remove all the `` things from the manifest. Take a look at the official documentation about the self defined actions http://developer.android.com/guide/topics/manifest/action-element.html – Gabriella Angelova Jun 19 '15 at 13:54
I did it. I wrote exactly the same but still LogCat gives me an error. FATAL EXCEPTION: main java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.oldie.AppSettings}:java.lang.NullPointexception I cleaned my project in Eclipse and did it again. the same problem – Εμμανουήλ Βαρέσης Jun 19 '15 at 13:56
Can you please debug and check if `imgsettings` is not null? – Gabriella Angelova Jun 19 '15 at 13:58
No. Sorry, it is null. – Εμμανουήλ Βαρέσης Jun 19 '15 at 15:52

score 0 · Answer 3 · answered Jun 19 '15 at 15:10

0

Try this in your onClick method.

 Intent myIntent = new Intent(MainActivity.this, android.intent.action.SETTINGS.class);

MainActivity.this.startActivity(myIntent);

answered Jun 19 '15 at 15:10

Prabhuraj

928
2
8
14

Did u try exactly this ? – Prabhuraj Jun 19 '15 at 15:43
Yes. But I found my problem. The problem is in the R.id. The imgsettings variable returns null. – Εμμανουήλ Βαρέσης Jun 19 '15 at 15:54

Android Intent and Intent filter

3 Answers3