Question

In my app I have three activity as

1. Activity 1

2. Activity 2

3. Activity 3

How to switch between activities.

So how can this be done?

 public boolean onOptionsItemSelected(MenuItem item)
{   

    switch (item.getItemId()) 
    {
        case R.id.settingOpt:                           
            Intent intent = new Intent(this, SettingsForm.class);
            this.startActivity(intent); 
            this.finish();
        break;         

        case R.id.reminderOpt:                          
            Intent intentR = new Intent(this, ReminderForm.class);
            this.startActivity(intentR);   
        break;

        case R.id.helpOpt:                          
            Intent intentH = new Intent(this, HelpForm.class);
            this.startActivity(intentH);  
            this.finish();
        break;

        case R.id.shareOpt:                             
            Intent share = new Intent(android.content.Intent.ACTION_SEND);
            share.setType("text/plain");
            share.putExtra(Intent.EXTRA_SUBJECT, "Name of the thing to share");
            share.putExtra(Intent.EXTRA_TEXT, "www.gmail.com");
            startActivity(Intent.createChooser(share, "Share LoveCycle's website link with your friends"));
        break;

        default:

        return super.onOptionsItemSelected(item);       
    }

    return true;
}

Answer 1

When I click back button from Activity3 I should always went to Activity1,instead of Activity2:

Use following method on back button press event in Activity3:

setResult(R.id.common_backToActivity1);

And in Activity2 capture that setResult as follows and close this Activity:

protected void onActivityResult(int requestCode, int resultCode,Intent data) {
        switch(resultCode){
        case R.id.common_backToActivity1:
            closeActivity();  //Finish Activity2 in this method
            break;  
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

Then you will get directly to Activity1.