protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//identify object
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
**title = (TextView)findViewById(R.id.theTitle);
Intent intent = getIntent();
String Title = intent.getExtras().getString("name");
title.setText(Title);**
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
Intent intent = new Intent(this, addCounter.class);
startActivity(intent);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
当nav_gallery = true时,它会将我带到activity2,其中包含以下代码:
public void addOk(){
String sendName = name.getText().toString();
Intent intent = new Intent(this, MainActivity.class);
intent.putExtra("name", sendName);
startActivity(intent);
}
我想将来自activity2的信息发送回主要活动。我的getIntent()是在错误的地方吗?
答案 0 :(得分:0)
你的getIntent()方法在onCreate方法中。 但onCreate只在创作时被调用一次。如果MainActivity仍在堆栈中,则没有理由再次调用onCreate()。
您应该尝试在onResume()或onStart()中插入代码。