Besoin d'aide Navigation Drawer

[Floo-Lapi]

Bonjour je débute en développement Android et je suis actuellement un tuto pour créer un Navigation Drawer  sur YT (Voici le lien : http://www.youtube.com/watch?v=Zuo3n-DjF7w ).

 

Mais je suis confronté actuellement à une erreur dont je n'arrive pas à trouvé la solution.
Normalement cela devrait rendre comme au stade du tuto où je suis (plus ou moins 17:40 min).
Merci d'avance ;)

 

Voici les erreurs :

02-10 11:31:12.432 2297-2297/com.example.flori.mylordring E/AndroidRuntime: FATAL EXCEPTION: main
                                                                            Process: com.example.flori.mylordring, PID: 2297
                                                                            java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.flori.mylordring/com.example.flori.mylordring.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference
                                                                                at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                                at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                                at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                at android.os.Looper.loop(Looper.java:148)
                                                                                at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                                at java.lang.reflect.Method.invoke(Native Method)
                                                                                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                             Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference
                                                                                at com.example.flori.mylordring.MainActivity.onCreate(MainActivity.java:31)
                                                                                at android.app.Activity.performCreate(Activity.java:6237)
                                                                                at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                                                at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                                                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                                at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                                at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                at android.os.Looper.loop(Looper.java:148)
                                                                                at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                                at java.lang.reflect.Method.invoke(Native Method)
                                                                                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

voici le code du Main :

package com.example.flori.mylordring;


import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageButton;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {



private static ImageButton imgView;
private int test;
int [] images = {R.drawable.im1,R.drawable.im2,R.drawable.im3,R.drawable.im4,R.drawable.im5,R.drawable.im6,R.drawable.im7};



@[member=override]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        DrawerLayout drawerLayout = (DrawerLayout)findViewById(R.id.drawerLayout);


        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayShowHomeEnabled(true);
        actionBar.setDisplayHomeAsUpEnabled(true);


        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);


        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
@[member=override]
public void onClick(View view) {
                Snackbar.make(view, "Rolololo", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }






public void image(View view){
imgView=(ImageButton)findViewById(R.id.imageButton);
imgView.setOnClickListener(new View.OnClickListener() {
@[member=override]
public void onClick(View v){
test++;
test = test % images.length;
imgView.setImageResource(images[test]);
            }
        }
        );
    }


@[member=override]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
    }


@[member=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);
    }
}

Voici le code de l'activité :

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/drawerLayout"
android:background="#e2656262"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.flori.mylordring.MainActivity"
tools:showIn="@layout/activity_main">


    <FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragmentholder">
    </FrameLayout>


    <ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/navlist"
android:background="#dedede"
android:layout_gravity="start"
/>


    <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="@+id/textView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />


    <ImageButton
android:onClick="image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageButton"
android:src="@drawable/im1"
android:background="@android:color/transparent"
android:layout_above="@+id/textView"
android:layout_centerHorizontal="true" />


</android.support.v4.widget.DrawerLayout>

Voici mon Manifest :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.flori.mylordring">


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />


                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>


</manifest>

​

[andry57]

A mon avis ce code :

ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayShowHomeEnabled(true);
        actionBar.setDisplayHomeAsUpEnabled(true);

 

doit être mis après setSupportActionBar(toolbar);