Navigation View---头部点击事件

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默认布局代码如下：

<pre name="code" class="html">    <android.support.design.widget.NavigationView        android:id="@+id/nav_view"        android:layout_width="wrap_content"        android:layout_height="match_parent"        android:layout_gravity="start"        android:fitsSystemWindows="true"        app:headerLayout="@layout/nav_header_main_ui"        app:menu="@menu/activity_main_ui_drawer" />

效果图如下：

在默认状态下如果直接通过findViewById来进行点击头部事件，则程序将会中止

报错信息如下：

10-25 11:58:27.052 3184-3184/com.fxly.XXXX E/AndroidRuntime: FATAL EXCEPTION: main                                                                 Process: com.fxly.XXXX, PID: 3184                                                                 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.fxly.XXXX/com.fxly.XXXX.MainUiActivity}: java.lang.NullPointerException                                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2187)                                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2236)                                                                     at android.app.ActivityThread.access$800(ActivityThread.java:138)                                                                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1199)                                                                     at android.os.Handler.dispatchMessage(Handler.java:102)                                                                     at android.os.Looper.loop(Looper.java:136)                                                                     at android.app.ActivityThread.main(ActivityThread.java:5095)                                                                     at java.lang.reflect.Method.invokeNative(Native Method)                                                                     at java.lang.reflect.Method.invoke(Method.java:515)                                                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)                                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)                                                                     at dalvik.system.NativeStart.main(Native Method)                                                                  Caused by: java.lang.NullPointerException                                                                     at com.fxly.XXXX.MainUiActivity.onCreate(MainUiActivity.java:53)                                                                     at android.app.Activity.performCreate(Activity.java:5231)                                                                     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)                                                                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2151)                                                                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2236)                                                                      at android.app.ActivityThread.access$800(ActivityThread.java:138)                                                                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1199)                                                                      at android.os.Handler.dispatchMessage(Handler.java:102)                                                                      at android.os.Looper.loop(Looper.java:136)                                                                      at android.app.ActivityThread.main(ActivityThread.java:5095)                                                                      at java.lang.reflect.Method.invokeNative(Native Method)                                                                      at java.lang.reflect.Method.invoke(Method.java:515)                                                                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)                                                                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)                                                                      at dalvik.system.NativeStart.main(Native Method)

修改如下即可完成点击头部事件

布局文件中去掉headerLayout

    <android.support.design.widget.NavigationView        android:id="@+id/nav_view"        android:layout_width="wrap_content"        android:layout_height="match_parent"        android:layout_gravity="start"        android:fitsSystemWindows="true"         app:menu="@menu/activity_main_ui_drawer" />

在JAVA中配置

    LinearLayout my_XXX;

       View drawview = navigationView.inflateHeaderView(R.layout.nav_header_main_ui);        my_XXX= (LinearLayout) drawview.findViewById(R.id.my_XXX); my_XXX.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Snackbar.make(view, "Click more message ", Snackbar.LENGTH_LONG)                        .setAction("Action", null).show();            }        });

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