Question

我是android的初学者。我想打开另一个活动类NewTest.class onclick导航抽屉的列表项。但我得到了 /com.navigation E / MainActivity：创建片段时出错。请告诉我这有什么问题？谢谢。这是我的MainActivity.class代码

...
//Let's say I want to show a MessageBox containing if the Service is connected to Server
MyService myservice = new MyService();
MessageBox.Show("Client Status: " + myservice.isConnected());

Answer 1

您可以使用onNavigationItemSelected（）方法。

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item)
{
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.idofYourNavmenu)
    {
        Intent intent = new Intent(CurrentActivity.this, ActivityToCall.class);
        startActivity(intent);
    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

Answer 2

你可以达到如下目的：

  Fragment fragment = null;
    Class fragmentClass = null;
    if (id == R.id.nav_1) {
        fragmentClass = demo1.class;

    } else if (id == R.id.nav_2) {
//pass Activity class where you want to navigate

        fragmentClass=CredentialActivity.class;
    } 

 try {
        if(fragmentClass.newInstance() instanceof Fragment) {
            fragment = (Fragment) fragmentClass.newInstance();

            if (fragmentClass.getSimpleName().equals("DailyReport")) {
                Bundle bundle = new Bundle();

                // Insert the fragment by replacing any existing fragment
                FragmentManager fragmentManager = getSupportFragmentManager();

                fragmentManager.beginTransaction().replace(R.id.home_layout, fragment).commit();
                // Highlight the selected item has been done by NavigationView
                item.setChecked(true);
                // Set action bar title
                setTitle(item.getTitle());
                // Close the navigation drawer
                drawer.closeDrawers();
            }
        }else
        {
            // After logout redirect user to Loing Activity
            Intent i = new Intent(HomeActivity.this, fragmentClass);
            // Closing all the Activities
            i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            // Add new Flag to start new Activity
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            // Start Login Activity
            startActivity(i);

            finish();
        }

如何点击导航抽屉的列表项打开另一个活动类？

2 个答案: