我在佈局actionbar_badge_layout.xml
文件:顯示java.lang.NullPointerException同時加入的動作條圖標文本
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="48dp"
android:layout_height="fill_parent"
android:layout_gravity="right" >
<!-- Menu Item Image -->
<ImageView
android:layout_width="48dp"
android:layout_height="fill_parent"
android:clickable="true"
android:src="@mipmap/icon_back" />
<!-- Badge Count -->
<TextView
android:id="@+id/actionbar_notifcation_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:text="99"
android:textColor="@color/primary_dark_material_light" />
裏面res/menu_comment xml
我:
<item
android:id="@+id/action_add"
android:icon="@mipmap/ic_menu_add"
android:actionLayout="@layout/actionbar_badge_layout"
android:title="Add"
app:showAsAction="always">
</item>
然後我的活動我內心有onCreateOptionsMenu()
爲:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_comment, menu);
RelativeLayout badgeLayout = (RelativeLayout) menu.findItem(R.id.action_add).getActionView();
TextView t = (TextView)badgeLayout.findViewById(R.id.actionbar_notifcation_textview); //here I am getting null pointer exception
t.setText("12");
return true;
}
但是我得到空指針異常。 Logcat給我輸出爲:
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.widget.RelativeLayout.findViewById(int)' on a null object reference
at com.mypackage.activities.ShowCommentsActivity.onCreateOptionsMenu(ShowCommentsActivity.java:77)
at android.app.Activity.onCreatePanelMenu(Activity.java:2820)
at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:275)
at android.support.v7.app.ActionBarActivity.superOnCreatePanelMenu(ActionBarActivity.java:276)
at android.support.v7.app.ActionBarActivityDelegate$1.onCreatePanelMenu(ActionBarActivityDelegate.java:79)
at android.support.v7.widget.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:49)
at android.support.v7.internal.app.ToolbarActionBar.populateOptionsMenu(ToolbarActionBar.java:459)
at android.support.v7.internal.app.ToolbarActionBar$1.run(ToolbarActionBar.java:69)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
這段代碼有什麼問題。任何建議將不勝感激。謝謝advace
同時發佈的問題:) –
@Yuva拉吉是通常被省略chainging應用後:actionLayout = 「@佈局/ actionbar_badge_layout」 它完美的作品。謝謝 – PPD