Java 导航抽屉无法设置文本和图像

Case_history_review.java

这是我的一个java使用导航栏

  Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    toolbar.setTitle("E-care");
    setSupportActionBar(toolbar);

    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

    NavigationView view = (NavigationView) findViewById(R.id.navigation_view);
    view.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(MenuItem menuItem) {
            Toast.makeText(Case_history_review.this, menuItem.getItemId() + " pressed", Toast.LENGTH_LONG).show();
            Log.d(R.id.nav_1+"", menuItem.getItemId() + " ");
            Intent intent = new Intent();
            switch (menuItem.getItemId())
            {

                case R.id.nav_1:
                    break;
                case R.id.nav_2:
                    intent.setClass(Case_history_review.this,queueshow.class);
                    //intent .putExtra("name", "Hello B Activity");
                    startActivity(intent);
                    break;
                case R.id.nav_3:
                    intent.setClass(Case_history_review.this,Appointmentcreate.class);
                    //intent .putExtra("name", "Hello B Activity");
                    startActivity(intent);
                    break;
                case R.id.nav_4:
                    intent.setClass(Case_history_review.this, AlarmActivity.class);
                    startActivity(intent);
                    break;
                case R.id.nav_5:

                    intent.setClass(Case_history_review.this, PatientReport.class);
                    startActivity(intent);
                    break;
                case R.id.nav_6:
                    intent.setClass(Case_history_review.this, TimeList.class);
                    startActivity(intent);
                    //logout
                    break;

            }
            menuItem.setChecked(true);
            drawerLayout.closeDrawers();
            return true;
        }
    });

    ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle( this, drawerLayout, toolbar, R.string.drawer_open , R.string.drawer_close){
        @Override
        public void onDrawerClosed(View drawerView) {
            super .onDrawerClosed(drawerView);
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super .onDrawerOpened(drawerView);
        }
    };
    db = new SQLiteHandler(getApplicationContext());
    HashMap<String, String> dbuser = db.getUserDetails();
    TextView name = (TextView) view.findViewById(R.id.drawer_name);
    String username = dbuser.get("name");
    Log.d("naem",username);
    name.setText(username);
    ImageLoader imageLoader = AppController.getInstance().getImageLoader();
    CirculaireNetworkImageView photo = (CirculaireNetworkImageView) view.findViewById(R.id.drawer_thumbnail);
    photo.setImageUrl("http://192.168.43.216/test/" + dbuser.get("image"), imageLoader);
    drawerLayout.setDrawerListener(actionBarDrawerToggle);
    actionBarDrawerToggle.syncState();

错误消息：

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
                                                 at com.example.yuen.e_carei.Case_history_review.onCreate(Case_history_review.java:116)

布局/drawer_header.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="150dp"
android:background="#0097a7"
>

       <com.example.yuen.CirculaireNetworkImageView
    android:id="@+id/drawer_thumbnail"
    android:layout_width="70dp"
    android:layout_height="70dp"
    android:layout_marginRight="8dp"
    android:elevation="8dp"
    android:layout_above="@+id/drawer_name"
    android:layout_alignStart="@+id/drawer_name" />

<TextView
    android:id="@+id/drawer_name"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="24dp"
    android:layout_marginStart="24dp"
    android:layout_alignParentBottom="true"
    android:text="Eddard Stark"
    android:textSize="14sp"
    android:textColor="#fff"
    android:textStyle="bold"
    android:paddingBottom="8dp"
    />
 </RelativeLayout>

menu/drawer.xml

 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
 <group android:checkableBehavior="single">
    <item
        android:id="@+id/nav_1"
        android:checked="true"
        android:icon="@drawable/hi"
        android:title="Case Review"/>
    <item
        android:id="@+id/nav_2"
        android:icon="@drawable/hi"
        android:title="Queue state"/>
    <item
        android:id="@+id/nav_3"
        android:icon="@drawable/hi"
        android:title="Create appointemnt"/>
    <item
        android:id="@+id/nav_4"
        android:icon="@drawable/hi"
        android:title="Alarm"/>
    <item
        android:id="@+id/nav_5"
        android:icon="@drawable/hi"
        android:title="Report"/>
    <item
        android:id="@+id/nav_6"
        android:icon="@drawable/hi"
        android:title="Logout"/>
 </group>
 </menu>

活动\u案例\u历史\u solo.xml

<?xml version="1.0" encoding="utf-8"?>
 <android.support.design.widget.CoordinatorLayout       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:fitsSystemWindows="true"
tools:context="com.example.yuen.e_carei.Case_history_review">

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <!-- your content layout -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/AppTheme.AppBarOverlay">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:popupTheme="@style/AppTheme.PopupOverlay" />

        </android.support.design.widget.AppBarLayout>

        <RelativeLayout 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"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            tools:context="com.example.yuen.e_carei.Case_history_review">

            <ImageView
                android:src="@drawable/hi"
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:id="@+id/imageView2"
                android:layout_alignParentTop="true"
                android:layout_alignParentStart="true" />

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_alignParentTop="true"
                android:layout_toEndOf="@+id/imageView2"
                android:layout_alignBottom="@+id/imageView2"
                android:id="@+id/relativeLayout">

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Name : "
                    android:textSize="25sp"
                    android:id="@+id/textView2"
                    android:paddingTop="10dp"
                    android:paddingBottom="10dp"
                    android:paddingLeft="10dp"
                    android:layout_alignParentTop="true"
                    android:layout_alignParentStart="true" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="ID : "
                    android:textSize="25sp"
                    android:id="@+id/idTag"
                    android:paddingLeft="11dp"
                    android:layout_below="@+id/textView2"
                    android:layout_alignParentStart="true" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Chan Tai Man"
                    android:textSize="25sp"
                    android:id="@+id/nameResult"
                    android:paddingBottom="10dp"
                    android:layout_above="@+id/idResult"
                    android:layout_toEndOf="@+id/textView2" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="N001"
                    android:textSize="25sp"
                    android:id="@+id/idResult"
                    android:layout_below="@+id/textView2"
                    android:layout_toEndOf="@+id/idTag" />
            </RelativeLayout>

            <ListView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/listView_case_history"
                android:layout_alignEnd="@+id/relativeLayout"
                android:layout_below="@+id/imageView2" />
        </RelativeLayout>
    </LinearLayout>

    <android.support.design.widget.NavigationView
        android:id="@+id/navigation_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:headerLayout="@layout/drawer_header"
        app:menu="@menu/drawer" />

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


<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_dialog_email" />

  </android.support.design.widget.CoordinatorLayout>

---

我想将抽屉标题中的文本更改为其他字符串。但是，它可以获取id，但会在运行时崩溃。请给我一些帮助来解决这个问题。谢谢。

错误描述TextView对象为空，表示当前运行的版面中不存在此类TextView

您正在调用的XML布局中是否存在textview？你把文本视图放在了哪个布局上？ 请检查您的活动是否正确

您在

findViewById（R.id…）

中使用的id可能是错误的。再检查一遍

你已经打过电话了

TextView name = (TextView) view.findViewById(R.id.drawer_name);

在Case\u history\u review.java中，但是您调用的布局中似乎不存在上述文本视图。您可能会在活动中调用下面的活动\u case\u history\u solo.XML，但它没有。上面的文本视图位于drawer_header.xml

---

希望这对你有帮助

试试这个。。！！TextView name=（TextView）view.findViewById（R.id.drawer\u name）；-->删除视图并像这样使用----TextView name=（TextView）findViewById（R.id.drawer\u name）；Thx，但我已经试过了，它不起作用

TextView name = (TextView) view.findViewById(R.id.drawer_name);