How to redirect to another activity with the short class name

Question

Suppose I have two Activity(under the same package):

HomeActivity(The launcher activity)

SpinnerActivity

Both of them are registered at the AndroidManifest.xml.

Now I try to create a method to implement the activity jump:

private void redirectToActivity(String dest) {
    Intent intent = new Intent();
    intent.setClassName(this,dest);
    startActivity(intent);
}

And I call it in the HomeActivity:

redirectToActivity("SpinnerActivity");

But I got this error:

Unable to find explicit activity class {com.app/SpinnerActivity}; have you declared this activity in your AndroidManifest.xml?

I tried to add this line:

intent.setPackage("com.app");

It does not work.

What's the problem?

Instead of using String maybe you could use Class variable ? — An-droid, Aug 20 '13 at 08:31
Can you post your manifest file ? If your activity name in the manifest is ".SpinnerActivity", try to start it with : redirectToActivity(".SpinnerActivity"); — nbe_42, Aug 20 '13 at 08:34
See if changing `intent.setClassName(this,dest);` to `intent.setClassName(getApplicationContext(), dest);` works. — Vikram, Aug 20 '13 at 08:36
@Yume117:I have to use the string because I get the activity name by user selecting through a ListView. — hguser, Aug 20 '13 at 08:36
@nbe_42: Yes, in the manifest it is ".SpinnerActivity", I have changed to `redirectToActivity(".SpinnerActivity")`, I still got the same error. — hguser, Aug 20 '13 at 08:38
Here is what i meant http://stackoverflow.com/questions/5754855/how-can-i-start-a-new-android-activity-using-a-string — An-droid, Aug 20 '13 at 08:38

score 1 · Answer 1 · answered Aug 20 '13 at 08:36

1

Unable to find explicit activity class {com.app/SpinnerActivity}; have you declared this activity in your AndroidManifest.xml?

your package-name is odd. i am used to something like "com.company.appname" and you got com.app/SpinnerActivity. Have you tried thinking in that direction?

answered Aug 20 '13 at 08:36

bofredo

2,348
6
32
51

Since this is a application for learning android. So I use the `com.app` as the package name, does this matter? – hguser Aug 20 '13 at 08:41

score 1 · Accepted Answer · answered Aug 20 '13 at 08:42

// Define it globally or in OnCreate() method

// If your all Activity is with in the same package then this approach is going to work.

final String packageName = this.getClass().getPackage().getName();
final Context context = this;

// call your method like this i.e SpinnerActivity
         private void redirectToActivity(String dest) {

                  try {
                        Class c = Class.forName(packageName + "." + dest);
                        startActivity(new Intent(context, c));
                    } catch (ClassNotFoundException e) {
                        Toast.makeText(context, String.valueOf(e), 5000).show();
                    }
           }

How to redirect to another activity with the short class name

2 Answers2