Question

我在编辑工具栏中的标题时遇到了一些麻烦。我想要标题，我一直在尝试一些不起作用的潜在解决方案。

当我运行以下代码时，我不断收到空指针异常。任何帮助，将不胜感激！

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

    Intent in = getIntent();
    String skill = in.getStringExtra("skill");
    String detail = in.getStringExtra("detail");
    String required = in.getStringExtra("required");

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    TextView toolbarTitle = (TextView) toolbar.findViewById(R.id.titleskill);

    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayShowTitleEnabled(false);

    toolbarTitle.setText(skill);

    toolbar.setTitleMarginBottom(50);
    //     toolbar.setTitle(skill);

布局文件：

<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_height="128dp"
        android:layout_width="match_parent"
        android:background="?attr/colorPrimary"
        android:minHeight="128dp"
        app:popupTheme="@style/AppTheme.PopupOverlay"
        android:gravity="bottom"
        >

        <TextView android:layout_height="match_parent"
            android:layout_width="wrap_content"
            android:fontFamily="sans-serif-light"
            android:textColor="@color/text"
            android:textSize="50dp"
            android:id="@+id/titleskill"
            android:maxLines="2"
            >

        </TextView>

    </android.support.v7.widget.Toolbar>

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

空指针异常：

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
                                                                              at athena.sentineljs.com.athena.Skill.onCreate(Skill.java:49)
                                                                              at android.app.Activity.performCreate(Activity.java:6664)
                                                                              at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
                                                                              at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
                                                                              at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) 
                                                                              at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                                                                              at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 
                                                                              at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                              at android.os.Looper.loop(Looper.java:154) 
                                                                              at android.app.ActivityThread.main(ActivityThread.java:6077) 
                                                                              at java.lang.reflect.Method.invoke(Native Method) 
                                                                              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
                                                                              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

Answer 1

使用包含此标记的

标记将您的工具栏布局文件包含在您的activity_skill.xml中

<include layout="@layout/<your toolbar file name>"/>

示例：如果工具栏布局文件名是toolbar.xml，则include标记应如下所示，不带.xml扩展名

<include layout="@layout/toolbar"/>

在工具栏中自定义TextView

1 个答案: