setText on ID not working in android studio

Question

I have a textview in my xml and I want to change the text from an intent. I've tried it before in the same class but on another xml and it works there. But after changing the contentView it don't work anymore. I want to set the displayName.

package de.myapp.app;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.TextView;

public class UserAreaActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTitle("");
        //setContentView(R.layout.nav_header_user_area);
        //final TextView displayName = (TextView) findViewById(R.id.displayName);
        //Intent intent = getIntent();
        //String dpdisplayName = intent.getStringExtra("displayName");
        //displayName.setText(dpdisplayName);

        setContentView(R.layout.activity_user_area);
        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);
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        //if (id == R.id.action_settings) {
        //    return true;
        //}

        return super.onOptionsItemSelected(item);
    }

    @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) {

        } else if (id == R.id.nav_slideshow) {

        } else if (id == R.id.nav_manage) {

        } else if (id == R.id.nav_share) {

        } else if (id == R.id.nav_send) {

        }

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

XML:

<TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/nav_header_vertical_spacing"
        android:text="Mr. Android"
        android:textAppearance="@style/TextAppearance.AppCompat.Body1"
        android:id="@+id/displayName" />

Because of the navigation. In the standard android navigation has the bar a own layout and the other layout is the main screen. — ItsOdi1, Jan 13 '17 at 12:33
And after setting the text in the first layout I want to go back to the main you understand? — ItsOdi1, Jan 13 '17 at 12:36
@ItsOdi1, im here again, but it seems that u cant use 2 layout or this is wrong. paste full code. — W4R10CK, Jan 13 '17 at 12:38
@W4R10CK I want to change the original title from a navigation activity "Android Studio" to the title from my intent — ItsOdi1, Jan 13 '17 at 12:40
Have a look at this as setContentView() is set twice http://stackoverflow.com/questions/22227950/android-is-using-setcontentview-multiple-times-bad-while-changing-layouts — Smitha_nj, Jan 13 '17 at 12:55
Find more info in http://stackoverflow.com/questions/22227950/android-is-using-setcontentview-multiple-times-bad-while-changing-layouts — Smitha_nj, Jan 13 '17 at 12:59

score 1 · Answer 1 · answered Jan 13 '17 at 12:37

At First Remove

Calling Multiple time

  setContentView(R.layout.activity_user_area); // Remove from 2nd time

Final View

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //Dont call setTitle(""); Here
    setContentView(R.layout.nav_header_user_area);
    final TextView displayName = (TextView) findViewById(R.id.displayName);
    Intent intent = getIntent();
    String dpdisplayName = intent.getStringExtra("displayName");
    displayName.setText(dpdisplayName);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    setTitle("");
  //code goes on here
  }

W4R10CK · Accepted Answer · 2017-01-13T13:39:31.287

1

[UPDATED] Use like this:

@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setTitle("");
 setContentView(R.layout.activity_user_area);

 Intent intentMain = getIntent();
 String dpdisplayName = intentMain.getStringExtra("displayName");

 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);
 View headerView = navigationView.getHeaderView(0);
 TextView navdisplayName = (TextView) headerView.findViewById(R.id.displayName);
 navdisplayName.setText(dpdisplayName);
}

edited Jan 13 '17 at 13:39

answered Jan 13 '17 at 12:41

W4R10CK

5,502
2
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java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference – ItsOdi1 Jan 13 '17 at 12:44
Because the displayName isn't in the activity_user_are but in the nav_header_user_area. Thats the problem and the app crashs – ItsOdi1 Jan 13 '17 at 12:45
yes, I missed that change contentView to `nav_header_user_area ` – W4R10CK Jan 13 '17 at 12:45
but after setting the displayName I need to go back to the activity_user_area because the rest of the code plays here. – ItsOdi1 Jan 13 '17 at 12:46
going back means, is it an activity or what ? – W4R10CK Jan 13 '17 at 12:47
Yes, its a navigation activity – ItsOdi1 Jan 13 '17 at 12:48
start activity to that activity. or backpress. – W4R10CK Jan 13 '17 at 12:49
I don't understand. Thats so difficult – ItsOdi1 Jan 13 '17 at 12:55
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/133083/discussion-between-w4r10ck-and-itsodi1). – W4R10CK Jan 13 '17 at 12:55

score 0 · Answer 3 · answered Jan 13 '17 at 12:38

0

while setting setContentView() second time, you have eventually changes your attached view hierarchy tree. Your changes to textview will no longer be visible since its not even attached to the activity

answered Jan 13 '17 at 12:38

user3859360

51
5

setText on ID not working in android studio

3 Answers3